Chapter 49 - Summer Inside His Sister

Ethan didn't think much of it. Why would he? This wasn't the first time he and his sister Katie would be stuck at home for most of the summer holidays. Seasonal work was scarce, as this wasn't a touristy area, so neither of them managed to find jobs to help them pass the time. Not that they had been looking particularly hard. Their mother, being half-Asian and half-Slavic, frowned upon the very idea of teenagers working. In her view, they were supposed to focus on school: learning, passing exams, and getting to a good college. Everything else, she'd sometimes say, was merely a distraction.

To Ethan, it didn't make much sense at all, but he long since decided he wouldn't be the one to argue. Earning extra money wasn't high on his list of priorities, as the living standard of his family has been far from uncomfortable. A large house in an affluent neighborhood, with a expansive backyard and a sizeable swimming pool, wasn't exactly the worst holiday scenery. All of this, and more, was paid largely by his parents' divorce settlement, along with the alimony that his father has been dutifully sending them, every month for many years.

Ethan didn't resent the man. In fact, he didn't know him very well at all, given that the whole kerfuffle happened when he was around five or six years old. The cliche concept of his dad cheating on mom with the secretary had been totally abstract to him then. Now, it was just a distant memory. Since the divorce, Ethan's mom had done almost everything she could to ensure that neither him, nor his sister, would ever feel like the family was missing something -- or someone.

And so, being eighteen now, Ethan shouldn't have much to complain about. But in truth, he had, except his problems were all of personal nature. It would be an understatement to say that Ethan didn't have a lot of success navigating the social minefield of high school. Being quite shy, he didn't have a lot of friends. The few girls he managed to ask out, rather awkwardly, responded with casual dismissal at best and outright mockery at worst.

While he wasn't ugly by any means, and his 5'11" frame gave him some physical advantage, Ethan's biggest problem was the fact that he was thoroughly unremarkable. Other than try to pay attention to what the teachers were saying (with decent success, to be fair), his interests consisted primarily of playing video games and jerking off. As it turns out, this wasn't a winning combination when it came to attracting the opposite sex, so Ethan remained a virgin, with dim prospects for changing that anytime soon.

His summer plans thus revolved mostly around "practicing" those two hobbies. The presence of his sister Katie posed no risk of cramping his style, for he didn't have much of one to begin with. If anything, it was her who could complain about having to hang out with her dumpy brother.

In high school, Katie had been the furthest from a social outcast. It was impossible to be one when you were one of the hottest girls in class, and especially when you paired those good looks with a bubbly, easy-going personality. Topping off at 5'8", with trim and athletically toned body, she enjoyed plenty of attention from guys who wanted to get between her long legs, or place their groping hands on her perky breasts.

Quite a few of them succeeded, actually, because Katie had a rather casual approach to sex and dating. Spiteful girls would call her a slut, but the label didn't really stick to the cute, innocent-looking blonde. Sure, she might have had a new boyfriend every few weeks or so, but she never cheated on any of them, nor had drunken hook-ups at parties like some of her classmates did. Katie's mother instilled in her the importance of academic achievement, so that was always the girl's first priority.

Now, Katie was coming back after her first year in college, older and far more experienced than her brother Ethan. The taste of campus life still fresh in her mind, she was looking forward to several weeks in her quiet little hometown. Between reconnecting with her old friends (of both sexes), her plans included mostly sunbathing and chilling out by the pool.

So, for the first week or thereabouts, Katie has been relaxing under the bright California sun, scrolling through her phone and idly pondering whether to get in touch with some of the guys she used to date.

Today was no different, as she was just about ready to go downstairs and start soaking up the morning rays of sunshine. Already in her small bikini, she realized there was one more thing she needed to bring to enjoy another languid summer day.

"Ethan, did you take my sunscree-- Oh!"

Katie clearly should've knocked, instead of absentmindedly walking into her brother's room without warning. If she did, maybe she wouldn't have seen what she was looking at now, shocked and wide-eyed.

"Katie?!... What the hell?!"

Ethan froze. He was still in bed, although he had pushed the covers and exposed most of his naked body. Laying on his back, he had both hands wrapped around the long, turgid shaft of his impressive erection. Like every day since puberty hit him, he was taking care of his morning wood. The last thing he expected was for his always-sleeping-in sister to barge in at such an early hour without knocking!

"Huh..." she said quietly, a slight smirk curling her lips.

He blinked, realizing Katie hasn't apologized, or scurried away sheepishly. Instead, she was still standing in the doorway, with a rather quizzical expression on her face. A moment later, she giggled, then simply walked in and closed the door behind her.

"Ugh, what the fuck?..." Ethan groaned in confused embarrassment, finally reaching for the sheet to cover his nudity. "Get out! Can't you see I'm --"

"Busy jacking your big cock?" she finished for him with a grin, glancing meaningfully at the prominent flagpole that was now tenting the sheets. "Sorry, bro, I'm afraid I have seen it all! You might as well just keep going..."

Ethan felt like his brain has turned into scrambled eggs. He couldn't quite understand what his sister was even saying to him. "Wha... what?"

"Come on! There's nothing to be ashamed of," she insisted, a tip of her tongue appearing between her lips for a brief moment. "I can see you aren't exactly, you know, finished with this..."

Ethan let out something between a sigh and another embarrassed groan. "I know..."

"So?"

"I can't do it with you standing here!"

"Why not?" Katie asked teasingly. "I'm pretty sure it would only make it easier for you..."

Some of the color on Ethan's face suddenly drained away. "H-how do you mean?"

She stepped closer, crossing her arms under the skimpy bikini top. Her breasts swelled, barely covered by the tiny triangular patches that hid little more than her nipples. "You could have a closer look," she said in a low voice, "instead of just peeping out your window..."

He swallowed, hard. He knew there was no denying it, because he *had* been watching his sister sunbathing for the past week. While it wasn't always her scantily clad body that he thought about when touching his rock-hard dick, Ethan's sister was definitely a recurring star of his frequent stroke fantasies.

"I... I'm..."

She shrugged. "Sorry? Don't be. I'm actually quite flattered," she said with an impish grin. "In fact, I was debating whether I should start working on my tan lines today... You wouldn't tell Mom if I did, would you?"

Ethan's eyes went wide, as he eventually understood what his sister was alluding to. Did she really say she wanted to sunbathe in the nude?

"N-no," he stammered, then took a breath and said more firmly, "Of course not!"

Katie's grin grew even more mischievous. "But you *would* be watching me, right?"

For the first time since she caught him, a faint trace of a smile appeared on Ethan's face as he nodded.

"Mhm..." Katie purred, evidently quite pleased with his answer. "I see... Would you do more than just watch?"

He swallowed again, reflexively glancing at his still-hard cock.

"Oh, of course," Katie understood immediately, then playfully shook her head. "But... really? I'm your sister, you know!"

"But you're hot!" he blurted out, surprised at his own boldness. "Err, I mean..."

"Uh-uh," she stopped him. "I know this is exactly what you meant! You want to jack off while watching your hot sister sunbathe without a swimsuit. Is this how my dorky brother plans to spend his summer?"

Now that she said it, Ethan realized just how pathetic it was. He sighed and hung his head low, averting his gaze from the half-naked figure of his sexy sister. He wasn't even sure if he was busted or not, but at that moment, he didn't really care. Even his morning hard-on, strong and unyielding thus far, began to slowly wilt in shame.

"Please," he croaked. "Can you just... go?"

"I'm not going anywhere, silly," Katie said, now with a kinder but still teasing smile. "Not until I've seen you cum!"--Ethan's eyes bulged out--"What?... If you're going to get yourself off while thinking about me, don't you think I should be allowed to see that?"

Before he mustered any argument against her weird logic, she grabbed the bed sheet and yanked it in one swift motion. Katie's brother was now exposed once again, naked and with a sizeable erection that was quickly growing back to full hardness.

"Mhm..." she purred again, eyeing his rising shaft. "Yes, you *really* have nothing to be ashamed of!"

***

As it turns out, not everything about Ethan was thoroughly unremarkable.

One evident exception, now displayed to his sister in all its throbbing glory, was the decidedly above-average size of his dick. It measured close to ten inches when fully hard, and had a wide girth to match its impressive length. When Katie finally saw it, unobscured by her brother's stroking hands, she couldn't help but to sharply draw air to her nostrils. The worldly girl has seen her fair share of cocks, of course, but this one had them all beat. And to think that it belonged to her awkward younger brother! Her mind immediately started to wander, thinking of the possibilities...

"Uhm... So are you going to just stand here, or...?"

"Oh, right," Katie said, pulled back from her momentary distraction. She skipped forward and sat on the bed, no further than two feet from Ethan and his rock-hard erection. "By all means, bro!" she added, offering him a cheeky grin.

"This is crazy," he muttered, then slowly wrapped his palms around the solid pillar. With some hesitation, the nervous boy finally began to stroke it, using the copious pre-cum he had already leaked over the lengthy shaft. He tried to keep his focus on the task at hand but his gaze kept drifting away, shifting to the sexy spectator who, somehow, had actually coaxed him into jerking off right in front of her!

Ethan's sister, sitting there in her barely-there bikini, watched her brother with intense curiosity. She still had a smirk of her face, but it was slowly fading, replaced by a less playful expression that belied her increasing desire to see his huge cock spurt. Now and again, she would fidget and bite her lip, trying to resist the urge to do something more than simply watch. Feeling more and more frisky, she grabbed her boobs and lifted them, clearly for her brother's benefit, then toyed with the thin strap of fabric that covered her hardened nipple.

Ethan saw it all. He was now openly staring at his wanton sister, gasping in disbelief at the lewd spectacle that she was putting for him without shame. Before long, and totally unprompted, she reached behind her back and untied her bikini top in a flash. Rather than make a big show out of it, she simply threw it away and raised her arms high, letting her horny brother to feast his eyes upon the perfect round globes of her ample bosom.

"Like them?" she asked playfully, squeezing her breasts together and giggling. "Much nicer to see them up close, isn't it?"

"Ahh... yeah," Ethan groaned, pausing for a second when he realized he might be getting close. "They are beautiful, sis..."

"Your sister's breasts," she reminded him, and chuckled. "That's what you are looking at, and jerking off! Damn, this is so naughty..."

For a while, the only sounds in the room were that of Ethan's increasingly frantic strokes, along with the short, rapid breaths of the two practically naked siblings. Katie's own arousal was surging to almost unbearable levels. She was now gasping and moaning, as she pinched and tweaked the hard nubs of her aching nipples. Only the thinnest sliver of inhibitions prevented her from jamming a hand into her soaked bikini bottoms, and sticking several fingers into her practically gushing pussy. This was her brother, after all; she shouldn't be masturbating next to him.

On the other hand, she was his sister, and he obviously *was* getting himself off right here! The fact that it was Katie who goaded him into doing this seemed strangely irrelevant now. She was horny enough to accept any excuse, as the smoldering furnace between her legs could no longer be ignored.

"Ahhh..." her brother then moaned, sensing his impending release. "Sis, I don't think I can hold it much longer... FUUUCK!!!"

With a savage grunt, Ethan exploded, discharging his first shot of hot white cum with an incredible force of his pent-up urges. Surprised, Katie didn't move at all, and she was instantly blasted by a copious amount of her brother's ejaculate. Stunned by its sheer volume, she quickly became an easy target of his next immense salvos.

Ethan was in heaven, groaning in pleasure from his tremendous release. He was watching in shock and excitement, as wad after wad of his own cum landed on the hot, practically naked body of his sexy older sister. He came and came, easily more than a dozen large spurts, before the final volley splattered against his crotch and trickled down the length of his thick, pulsing shaft.

After that, he threw his head back, overwhelmed by the intense experience. He stared at the ceiling, unable to move a muscle, wondering if the sight of his gorgeous sister covered from head to toe in his cum was merely an erotic fantasy...

"Holy shit!"

Or maybe it was not?

"Jesus, bro! Do you always cum so much?" his sister asked, laughing. "Guess it was smart of me to take the top off, right?"

Nope, this wasn't just a figment of Ethan's sex-crazed imagination. His sister Katie was really sitting on his bed, with gobs upon gobs of his thick seed coating most of her nubile body. She looked as if she had spilled a whole quart of milk on herself, and particularly on her shapely boobs that were now dripping with her brother's semen. She even got some of it trailing down her cheeks and forehead, and quite possibly a splash or two that glued together several strands of her hair. Very little of her smooth skin has been spared from the powerful outbursts of her brother's rampant cock.

"Wow, Katie..." he stammered, his brain having trouble to even register this straight-up pornographic view. "I... didn't mean to..."

"To cover your sister in cum? You don't say!" she tried to rib him, but couldn't resist to immediately burst into a fit of giggles. "Geez, Ethan! You really gave me more than I bargained for. Was it all just because I showed you my boobs?"

"Uhm... I... I think it's simply because you were here," he answered sheepishly.

"The real thing is better than your imagination, huh?" Katie teased him, swiping a finger over her glazed cleavage and popping it inside her mouth. "Mmm, your cum tastes pretty good, too!... But wait a minute, I can see that you are still hard. Does it mean you need to jerk off again?"

A deeper blush colored Ethan's already red cheeks. "Yeah, maybe even more than once," he said, gazing at his hot, jizz-covered sister. "I normally do it twice every morning, but after... this... I don't think it's gonna go soft so easily."

Katie stared at him slack-jawed, her mouth catching some stray dollops of cum that were still dribbling down her pretty face. She could scarcely believe her ears! Could it be true? Was her total goof of a brother actually an absolute stallion in disguise? She saw his huge cock, she saw him come literal buckets all over her naked body, she could see him stay rock-hard even after this epic orgasm, and now he's claiming he'd be good for two, maybe even three more rounds?!

It sounded almost too good to be true. Her pussy was practically on fire; the week-long abstinence from sex was really starting to take its toll on the highly libidinous girl. She needed a good fuck, and she was almost desperate enough to try ringing up some of her ex-boyfriends. But what if she didn't need to? What if the solution to her woes had been right here, all this time?...

"Ethan, I need to ask you something," she started, suddenly getting quite serious, "but please, think carefully before you decide to answer..."

Intrigued, if a little worried, he got up and sit next to her. "What is it, Katie?"

She took a deep breath, then closed her eyes and said, "How would you like it to have sex with your sister?"

***

True to his promise, Ethan's cock didn't even begin to go down. Given the prospect of potentially getting inside the steamy hot pussy of his older sister, it could probably stay hard like that forever. But Katie wasn't looking for a one-and-done deal. If she were to commit incest -- a morally iffy endeavor, regardless of how willing you were -- she had to be sure that her brother would be in for the long haul.

"I don't care that you're a virgin," she stated right away, much to her brother's chagrin. "What? You thought I wouldn't figure it out?... Please! It's painfully obvious that this is the first time you are naked with a girl. But don't worry, bro," she said with an encouraging grin. "because if we do this, then I can guarantee you will get a *lot* of practice!"

He swallowed, watching his topless sister use a towel to wipe the last bits of his cum from her body. He still wasn't certain that all of this wasn't simply some wet dream. Was he really talking to his hot sister about the two of them having sex all throughout summer?

"Yes," he said, agreeing for the umpteenth time. "Yes, dammit! Where do I sign up?"

She rolled her eyes. "Did you even listen to me, you doofus? I said that I can probably take even a dork like you, and turn him into someone who knows his way around the bedroom. What I don't want is for this whole effort to go to waste," she said resolutely. "If we fuck, and you'll get all cocky and confident, and you get yourself a 'real' girlfriend, then I don't want to be left out because you are suddenly in love, and you can no longer have sex with your sister! Do you understand that?"

"Wow, sis," Ethan let out, instinctively stroking his persistent erection. "You sure don't beat around the bush!"

"I don't," she agreed with a sigh, eyeing his massive hard-on. "Why should I? We both need the same thing. I just need you to promise that once you start fucking me, we will keep doing it until the end of summer."

"I pro--"

"No," Katie interrupted him. "Think with your other head for a minute, okay? This is incest we are talking about. Even my friends back in college, who are into some kinkiest shit you can imagine, would probably agree it's a little weird to have sex with your own brother," she said, then added in a low voice. "But I think it's actually pretty damn hot..."

Ethan wanted to immediately agree, then remembered he was supposed to consider the issue more carefully.

In truth, however, there was nothing here for him to think about. His incredibly sexy older sister, whose gorgeous nubile body he had jacked off to numerous times, was offering to become his fuck-buddy for the whole summer! Rather than beat his hard meat on his own, Ethan could be sticking it inside what he imagined was some very hot, very tight pussy that would fit perfectly around his throbbing erection. So what that it belonged to his sister Katie?

"I want to fuck you, Katie," he said with utmost sincerity. "I don't care if people say it's wrong. You are the sexiest girl I know, and I would love it more than anything in the whole world!"

Katie's face lit up with a beautiful smile, and she quickly turned it into a sultry and seductive grin. "Yes, I can see that", she said, looking at Ethan's pulsing erection. "You have a beautiful cock, my not-so-little brother"--Ethan's dick twitched at the compliment--"and I can't wait to feel it stretch me from the inside, and fill my pussy with your forbidden cum," she moaned, tweaking her hard nipple as she rubbed her legs together. "But you should know that I can quickly become very demanding... Are you sure you'll be able to keep up with me? How often can this thing get hard?"

"Well..." Ethan hesitated, still a bit embarrassed to open up about his masturbatory habits. "Since you arrived, it's been like... a lot. And I have to jack off more than usual, too."

"Because you've been watching me, you perv!" she seemingly scolded him, except her smile was cheeky and radiant. "Good! How often?"

"Uhm, twice in the morning, like I said... Then probably around lunch, 'cause you'd be outside by the pool," he said timidly. "I guess once more before Mom comes home from work. By then, I'm usually fed up with losing in Fortnite so, ugh, I have to relax I suppose... After dinner I'd usually do it, too, especially if it's a raid night. This way, I can focus on my DPS rotation and not on, uhm, you know..."

"Fantasizing about your hot sister?" Katie teased him, playfully wagging her finger. "Tsk, tsk! I'm disappointed, Ethan. You should be thinking about *me*, not your stupid games!"

His blush deepened, and he had to clear his throat before continuing. "Yeah, so that's actually what I do before I fall asleep, when I jack off one last time..."

"Okay," said Ethan's sister, glancing sideways as she did some math in her head. "So that's gonna be... Fucking hell! Six? Seven times a day?!"

"Huh, I guess it might be this much," Ethan mused, briefly looking down at his (still!) rigid erection. "Like I said, it's been a lot since --"

"Shut up!" Katie suddenly yelled, taking a deep breath while Ethan held his. "Just stop talking, and let me think," she said, then muttered something and let out a long sigh. "Okay, dear brother, here's what's going to happen. From now on, you are NOT allowed to jerk off! Not to relax, not to 'help you focus', not for whatever lame reason you can come up with... Instead, this cock"--she actually grabbed it, for the first time, and Ethan's eyes practically bulged out!--"is going inside ME!... Any time you feel like it, any time *I* feel like it, you are going to put it inside my dripping cunt, and you're going to fuck me until neither of us can move anymore!"

Katie's eyes shone with pure, unbridled lust, and Ethan was in equal parts mesmerized and terrified. Seeing his trepidation, she allowed herself a hearty chuckle, and gave his rock-hard cock an encouraging squeeze. "Aww, don't be scared, little brother! You are going to love it. Your big sister"--she scooted up to him and whispered in his ear--"is going to take a very good care of you..."

Ethan swallowed. There was a moment when he thought she was going to kiss him, but she only licked her lips and giggled seductively. He felt her hand press against his chest, pushing him back on the bed. He lay down, rock-hard cock sticking up like a flagpole, while his sister looked at him with a smirk and a wicked gleam in her eye. It took her less than a second to finally get rid of the sodden bikini panties, exposing her smooth, hairless pussy to the hungry stare of her still disbelieving brother.

"Do you like it?" she purred, pushing apart the glistening labia. "I always keep it clean and bare, so I can wear those tiny bikinis. You know, the ones that you seem to like so much!" she added with chuckle. "So, what do you think? Do you want this to be your first pussy?"

"God, yes!" Ethan croaked, his gaze fixed on the shaven mound. "It's beautiful, sis..."

With a sultry moan, Katie climbed on the bed and straddled her brother's lap. Mere inches from the tip of his swollen cock, her steamy hot pussy was already embracing the massive shaft with gentle, warm breeze that radiated from the sopping wet furnace. Biting her lip, Katie steadied the twitching pole with her hand and slowly lowered herself upon the meaty pillar.

"Oooooooooooh!..."

They both moaned, when the large head of Ethan's sizeable rod split the pink lips of his sister's young, yet experienced pussy. As it entered further, going all the way to her cervix, Katie was starting to realize that this might be the best cock she'd had in her whole life. Never before she had felt so full, so complete... Her very own brother was the biggest stud that has ever entered her discerning cunt, and the only thing she regretted about committing incest with him was the fact that she hasn't done it sooner!

"Ahhhhh..." she moaned again. "It's so big!... Gimme... just a moment..."

Ethan was in no position to argue. As far as he knew, he has just died and gone to heaven. The sensation of his sister's pussy, tightly hugging his throbbing hard-on, was lighting up neurons in his teenage brain that he didn't even know he had. No amount of lube, no practiced stroke or tug, no touch of his own hand or fingers could compare to the mind-blowing experience of feeling the gently quivering walls of his sister's love canal.

For a moment, he thought he'd blow it right then and there, but Katie thankfully stopped moving when she sheathed him completely. It allowed Ethan to adjust, if only just a little, to this awesome new reality.

He was no longer a virgin -- and that's because his hard cock was now inside the heavenly pussy of his hot, older sister!

"Still with me?" she asked playfully, giving her brother a wink. "A little overwhelmed, huh?... That's okay. No, really"--she placed both hands on her lover's chest-- "it's fiiiiiiiine..."--she started to gyrate--"totally... ooh!... totally fine..."

Though very slow at first, Katie was really starting to fuck her brother now. Her breath was getting ragged, intertwined with lustful gasps and moans as she worked every angle of Ethan's massive hard-on. She didn't even have to do all that much, for the sheer size of his tremendous pillar guaranteed it would easily hit all the sensitive spots inside her tightly packed pussy. A small bounce here, a little sway there, some gentle rocking back and forth, and she was already almost breathless. Her brother's cock was driving her wild! She knew she'd need it in her a lot from now on, and she was hoping that Ethan would happily oblige.

And how could he not? The boy was in seventh heaven right now. The marvelously tight pussy of his feisty sister was gripping his stiff cock in all sorts of wonderful ways, sending pure pleasure straight up his tingling spine. It was all too much for him, really, especially with Katie's nude, erotically sleek body writhing on top of him. He didn't dare to touch her anywhere above her firm thighs, afraid he might already explode inside her wet box if his hands wandered any further. He desperately wanted for this moment to last for a long time, because it was clearly just a dream that he'd soon regret waking up from...

"Ooooh..." Katie moaned, leaning back and pressing down onto Ethan's rigid manhood. "I can't believe... that my brother is so huge!... Oh god, I'm almost there... Yes... Oh yes!... Fuck! I'm coming bro! YOUR SISTER IS CUMMING ON YOUR BIG COCK!!!"

Her whole body trembled from the intensity of her massive orgasm. A guttural moan forced itself out of her throat, followed by many more strained groans as the crashing waves of her climax shook the young girl to the very core. Katie's overstuffed pussy convulsed in numerous spasms, clenching down on her brother's thick meatpole. For the excited boy, this was the final straw; he could last not a second longer.

"Oh... god... me too, sis!" Ethan roared, feeling his balls lurch right before the inevitable eruption. "I'm... cumming.... aaaah!... I'm cumming... inside you..."

"YES! Cum with me, Ethan! Fill your sister's pussy with everything you've got!"

Blast after blast, he pumped his voluminous load deep into his sister's vagina. With every grunt, he flooded her pussy with a new deluge of his potent seed; a liquid proof of their lurid, incestuous union. Their simultaneous orgasms, more powerful than anything either of them has experienced, lasted for almost a minute. Though it has been the first time only for Ethan, in truth even Katie couldn't compare it to anything she had felt before. She wailed, and thrashed, and screamed her throat hoarse in ecstasy, before finally collapsing on top of half-conscious Ethan. It was nothing but pure sexual bliss, and she only experienced it because of her own brother!

Neither of the exhausted, sweaty siblings has moved or said anything for several long minutes. Eventually, Katie chanced to slowly revive her arms and try to push against the mattress, groaning as she propped herself back to a sitting position. As her taut butt landed on her brother's lap once again, the tired yet contented smile on her face turned into a cheeky grin. She wiggled a little, just to be absolutely sure, but there was really no doubt about it.

Even after this monstrous orgasm, which practically knocked out both of them for a good while, Ethan's dick remained firmly lodged inside the cum-filled pussy of his sister. She quickly realized, to her immense delight, one other thing about her brother's magnificent cock. Despite this very recent and very impressive discharge, it was still rock-hard!

***

Katie wasted no time taking advantage of her fortuitous discovery. Once Ethan came to his senses -- and realized that yes, he was in fact fucking his beautiful sister -- she rolled them over and lay on her back. It didn't quite work at first, for he clumsily fell on top of her, making her giggle at his obvious inexperience. She didn't mind; in fact, she found it rather adorable, especially in contrast with how well-endowed and virile her brother was. She felt honored to be the one to introduce the novice stud to the wonderful world of sex, and also lucky that, at least for the time being, she'd have him all to herself!

"Fuck me, brother," she moaned, her hands kneading his firm ass. "Push that huge cock deep into your sister's wet pussy!"

Awkward and nervous though he was, Katie's brother was still a horny, red-blooded teenage guy. He didn't need more encouragement. The combination of his raging hormones, primal instincts, hours of porn he had watched, and his sister's gentle guidance was more than enough to get him going. So, after a moment of hesitation, he started thrusting into Katie's sopping wet gash, reaching deep inside her, spilling much of the cum he's already pumped into his horny sister. It was dirty, it was messy -- and it was, without a doubt, amazing.

"Harder, Ethan! Really give it to me now!... Ooooh! Yes! Fuck me good!"

With every thrust, the shy and awkward boy was gaining more and more confidence. How could he not? Writhing beneath him was his sexy older sister, gasping in pleasure that his cock has been giving her, already well on her way to a shuddering orgasm. Only a few hours ago, he would never have believed he'd have sex with a woman whom he had fantasized about so much... A hot, taboo, forbidden sex with his absolute knockout of a sister!

It wasn't long before Ethan was fucking her as hard as he could, slamming the headboard against the wall just as he slammed into her gushing pussy. In the heat of the moment, their lips locked passionately, their hungry kiss an expression of pure, unbridled lust. Lasting but a few moments, it ended when the raw intensity Katie's orgasm took her breath away, and left her gasping in ecstasy while her brother continued to fuck her all throughout this powerful climax.

It soon turned into a blur of continuous orgasms for her, one coming right after another, until the eager stud spurted himself once again, flooding his sister's thoroughly fucked orifice with many more ounces of dense, teenage cum.

His strength sapped, Ethan rolled over and lay on his back, panting heavily from the exertions of this wild, incestuous tryst. Next to him, Katie was lying in a blissful afterglow, her racing heart rate finally beginning to slow down. She could scarcely believe how good it had felt to fuck her own brother. Any feelings of guilt, if they even had time to enter her mind, were wiped hundred percent clean by the sheer ecstasy of their lurid coupling. Her slightly sore pussy, currently leaking copious amounts of Ethan's cum and her juices, tingled pleasantly, as it reluctantly contracted in the absence of his thick shaft.

She was content, though not quite satisfied. Katie's appetite for sex seemed to be growing at a rapid pace, just from her close proximity to the young stallion.

"So, how's that for your first time, bro?" She rose and leaned over him, smiling. "Having fun so far?"

Ethan exhaled in a long, drawn-out sigh, followed by an amused chuckle. "Yea... It was incredible! I can't believe we actually did it."

"Nuh-uh," said Katie, casting a longing glance at her brother's dick. "We aren't really done here now, are we?..."

Indeed, they didn't seem to be. Slick with their combined fluids, Ethan's cock has softened only slightly. With a small effort, it could easily be revived for another, even longer round of lovemaking. But Ethan wasn't sure he was really up for it just yet. As his rather scrawny physique would indicate, he was wholly unaccustomed to physical activity; the effort of fucking his sister has actually left him a bit winded. In his head, he cursed himself for steadfastly avoiding the gym, worried that his lack of endurance might dampen Katie's enthusiasm in the future.

"You're tired, huh?" she guessed on her own. "Well, that's a bit of a bummer. But!... All the more reason to make this into your daily workout!"

He blinked. "So you want to --"

"Do it again? Hah! You're kidding, right?" she said with a girlish giggle. "Bro, I've never cum so hard in my life! Your dick is really something else... Gosh, I wish I knew it sooner! Why didn't you tell me?!"

"Ugh, how exactly would I --"

"I'm kidding! Good to know that even as not-a-virgin, you are still my dorky little brother," she said endearingly. "Anyway, if you need a breather then I think it's time to clean up. Come on!"

Before Ethan could respond, Katie jumped out his bed, laughing as she held a hand against her leaking pussy. Winking at him sultrily, she scurried towards the bathroom, her brother eventually trailing behind. Watching his totally naked sister walk around the house like that, Ethan once again thought that all of this might just be a surreal, yet very sexy dream. This time, however, he simply chuckled as he dismissed the idea out of hand.

"Get in!" Katie called to him from the shower. "The water is nice."

The cabin was quite spacious, so he had no problems squeezing in. He gasped as he did so, seeing his sister unceremoniously wash her pussy with her fingers. Grinning, she passed him the shower gel and told him to soap her up, then made her intentions crystal clear by grabbing his hands and placing them on her perky butt.

Ethan's cock, which never went completely soft, started to harden rapidly as his sister rubbed her sleek body against his. Purring seductively, she took the stiffening rod into her hands and massaged it back to full readiness, just mere minutes after her potent brother came for the third time!

"Mmm, very nice," she moaned, enjoying his excited hands touching and exploring every inch of her wet skin. "You are eager to get to know your sister's body... Hmm, maybe I should let you get more familiar with what a naked girl looks like? Would you like that?"

"Huh... What do you mean, sis?"

"I could just go nude... Actually, I think we should both just stay naked from now on," she said, looking up at him with a wicked grin. "This way I can always tell when my cute little brother is getting hard for me! Too bad he is not allowed to jerk off anymore..."

Ethan gasped. "No way! I would have a permanent boner!"

"I fail to see the problem," Katie said mischievously. "Remember what I told you before? Any time, dear brother... I'm pretty sure I'll never get enough of your big, hard cock!"

He gasped again, now that the full implications started to dawn on the horny boy. "Are... are you serious?"

She treated him to a beautiful sight of her cheeky smile. "Completely serious, Ethan. Whenever you want it..." she trailed off, allowing his imagination to run wild. "My body is yours to take, brother. Always. Touch me, kiss me, feel me up, or fill me with your cum... Anything you want! Just remember that it goes both ways. Don't expect me to bugger off because you want to play your dumb video games. When your sister wants cock, it is your duty as a brother to oblige!"

Ethan couldn't believe his ears. It was really a dream come true for the sex-starved teenager. His cock responded accordingly, twitching in his sister's hand. She continued to stroke it, every now and again, while soaping up the rest of her brother's body.

"Games? You're kidding, sis," he said with a laugh. "Why would I care about any of that when I've got *you*?"

"Mmm, that's what I want to hear... But seriously, Ethan: if we go with this, then we'll be fucking pretty much all the time. That's a big step for someone who has just lost his virginity!"

"I'm ready!" Ethan said without hesitation. "I never want to stop fucking you, sis... But wait! What about Mom?"

"What? You want to fuck her, too?"

That was a totally out-of-the-blue question from Katie, but it sure has thrown Ethan off for a moment. "Wait, what?!... No, I mean... What should we do when she's not at work?"

Katie paused her stroking, lost in thought for a moment. "I don't know... Do you think we should keep it a secret?"

He blinked. "...Is there some other option?"

"Well, maybe there is," Katie said cryptically, which put a terrified expression on Ethan's face. "Okay, look: I know Mom can be a pain in the ass sometimes, but she's very--how do I put it?...--practical. You know why she never gave me any shit about my boyfriends? I could bring a guy home any time I wanted..."

He remembered that. Most nights that she spent at home, Ethan's sister would sleep with whatever guy she was currently dating. The sounds coming from her bedroom were a major fuel to his fantasies, and another reason why Katie starred in them so prominently. He had been jealous of her, often wondering what it would feel like if it were him, making his sister moan in pleasure... The memory was making him somewhat uncomfortable.

"Hey! Don't even think about it!" Katie chided him as she sensed his unease; Ethan's cock became just a touch softer in her hand. "Yes, your sister has been getting around. So what? I like sex. I bet you've noticed that already!" she said with a chuckle. "Anyway, what I'm saying is that Mom knew about my antics and was fine with it. All I had to do was to keep my grades up, and stay out of trouble."

"Yeah, it's the grades part that I always had problems with," Ethan said with a sigh, remembering how his mother didn't like him getting the occasional C+. "Thank god it's summer already!"

"Yup! And what better way for us to avoid trouble than to stay home and have sex with each other?" Katie asked rhetorically, her nose twitching as she almost snorted a laugh. "Seriously though, I've got a sense that Mom would be cool with it."

"Uhm, sure... So, uh, how exactly do you want to handle this?"

Katie just shrugged. "No idea. Didn't think that far," she admitted, then looked down at her brother's renewed erection. "Well, well, if isn't my stud being hard and ready again! Let's finish up here, before we turn into prunes, then go back to bed?"

Ethan has momentarily forgotten their dilemma about Mom. What Katie just said was nothing but music to his ears!

***

The second part of their all-out fuckfest was, unbelievably, even longer and more intense than the first.

They changed the soiled sheets on Ethan's bed in *extreme* hurry, then Katie immediately got on all fours and moaned for her brother to fuck her from behind. He did, naturally, and they rutted like crazy, until Ethan once again came buckets inside his sister's insatiable pussy. He needed another timeout after that, purely to catch his breath, but his athletic lover would not relent so easily. Straddling her brother, the horny girl impaled herself upon his somewhat faltering hard-on, then rode him in reverse while Ethan only watched her firm ass bounce up and down on his lap.

Right then, he made a solemn oath: should he survive the wringer his sister was putting him through, he'd start making daily use of his family's basement gym!

When Ethan finally came, after countless times Katie managed to get off on his huge cock, the tireless vixen got up and knelt between his legs. Licking her lips, she bent down and swallowed most of her brother's semi-hard dick, moaning lustfully as she tasted the heady mixture of his cum and her own pussy.

She had planned to clean him up, and perhaps finish him off with a slow blowjob, but Ethan shocked her once again. Though the load of semen that he shot in his sister's mouth was noticeably smaller than his previous explosions, it was still much more than she expected. More importantly, his dick didn't soften much while she was vacuuming the last drops of his tasty seed that lingered in the wide sperm duct. Surprising even himself, Ethan eventually got fully hard from Katie's ceaseless ministrations, at which point she took his shaft out of her mouth and examined it with her fingers.

"Fucking hell," she said in disbelief. "Where have you been all my life?!"

He chuckled. "All your life? Sis, you are nineteen! And I was right across the hall."

"Figure of speech, dummy," she retorted with a toothy grin. "Point is, you and your dick are actually starting to wear me out. From what I remember, I've been doing most of the work, while you just lay back and... and stay hard! Somehow!"

By this point, Ethan could read his sister well enough to know this wasn't a real complaint. "I guess I'm... sorry?" he said with a grin.

"Awesome," Katie said sarcastically, letting go of his cock and stretching her sleek, toned arms. "Well, bro, I'm afraid you're gonna have to hold out for later. I'm more hungry than I'm horny, and I say that it is about time we made some lunch. Any objections?"

Ethan had none. In fact, Ethan would never object to anything his sister suggested ever again. Today was the best day in his entire life, and it was all thanks to her. To think that it was just the beginning -- that he could expect an encore every single day, as he and Katie were to fuck the summer away like rabbits -- was just mind-blowing to him. There was no way life could get any better than this!

"I'll make us some sandwiches," Katie said, casually sauntering away in her birthday suit. "Come down in a few minutes, alright? And remember..."

"What?"

She smiled seductively. "We stay like this"--she pointed at her nakedness--"whenever Mom isn't home!"

Leaving her brother with a big smile on his face (and another set of dirty bed sheets to deal with), Katie walked downstairs and made her way to the kitchen. She threw some bread in the toaster, then scoured the fridge and found some cheese, sliced meat, and other suitable ingredients. She was humming cheerfully as she started to layer them up, feeling a very satisfying ache between her legs.

Yes, today was simply terrific! Who could've thought that her nerdy brother was packing so much heat? And holy shit, does it ever go down?! Apparently not, Katie thought as she giggled to herself. She was already making plans to further take advantage of Ethan's extraordinary stamina, ideally in a way that could advance his sexual education. How well could he eat pussy, she wondered? Maybe she could work on some of those tan lines after all, sunning her naked body while he ate her out, bringing her to one screaming orgasm after another...

"Oh, there you are. I couldn't find you by the pool, and I didn't want to hear Ethan complain again how I'm interrupting his -- Uhm, Katie... Where are your clothes?"

A knife fell to the floor with a clank.

"MOM!!! You're not at work?!"

She shrugged. "I came home early. My team's getting better at not arguing every minute detail during sprint planning, so we finished an hour earlier," she explained. "I'll catch up on some work in the evening... But what about you? I can see you are having a boy over"--she pointed at her daughter's breasts, which she self-consciously covered with her hand--"Cute. Try not to parade like that before Ethan, okay? Your brother's got enough hormones in his system already... Do I know him, by the way? I mean the boy that you are, well, you know..."

Katie barely moved, thinking desperately how to signal Ethan to stay in his room. Her iPhone was still in her beach bag, untouched since she walked in on her brother and dropped it by his bed. The family iPad was nowhere in sight, and it was unlikely her brother would make his phone buzz on every email anyway. Her best option was to run back upstairs right now, but she couldn't think of a good excuse why she'd suddenly need to do so.

"Uhm, yeah," she stammered. "I think you would remember him..."

"Oh, I'm sorry, I guess that's not really a business of mine," her mom said with a smirk. "Either way, he's very lucky to have you, Katie. Make sure he treats you right, even if it's only sex."

"H-he is, Mom," Katie stuttered again, only now reaching down to pick up the knife she had dropped. "I wouldn't be making him sandwiches if he wasn't!"

"Right," her mom said with a chuckle. "Especially these days, men appreciate when you don't shy away from the kitchen. Sometimes it's even more important than the bedroom!"

"Mooooom!"

"Oh, shush! I know you had no problems attracting quite a few, ahem, suitors, but that doesn't mean you can rest on your laurels. What matters is to attract the *right* guy for yourself!"

Katie just sighed, choosing not to comment on what her mother thought was timeless wisdom. She focused on chopping the olives and praying that her brother somehow takes an hour changing the sheets, rather than doing it as quickly as possible so he can come down and ogle his naked sister.

The latter was, obviously, what Ethan has actually done.

"All sheets in the hamper, sis! I threw in your bikini, too. You forgot to pick it up, you know? Mom would get suspicious if she found it on the floor in myyyyyy-y-y-y..."

He noticed her then.

"Ethan? Did you too forget your -- oh..."

The siblings looked at each other, stunned.

Neither of them dared to breathe, let alone move. Both Ethan and Katie remained frozen, looking at each other, trepidation painted clearly on their young faces. Neither of them dared so much as a glance at their mother, who was staring at her son with a quizzical expression. Several long, heavy seconds have passed before any sound disturbed the eerie silence.

"Well! I'm sure there is a perfectly valid explanation why my kids are walking around naked, and..."

The mother's voice faltered, and she bit her lip as she felt a bunch of confused emotions flow through her, one after another.

"Uhm, we were just... I mean..."

"Stop it, Ethan," his sister said soberly. "We aren't going to pretend this isn't exactly what it looks like... Mom? Ethan and I are having sex."

Mom's lips quivered. She looked at both her children, and saw that there was not a stitch of clothing between them. It was completely surreal.

"How long?..."

"Just today," Katie jumped to answer. "It... sort of happened."

And then it happened again, and again, and again... That's what she thought in her head, but of course Katie was smart enough not to say it out loud.

The situation was awkward enough already, with both her and Ethan standing in the living room and kitchen, naked, and still very much covered in liquid evidence of their recent coupling. Katie was strategically hidden behind the counters, so a hand on her breasts was enough to stop her from flaunting her intimate parts. But Ethan was right there in the open, and clearly too shocked to even think about covering his sizeable dick. The monstrous thing was still at half-mast, and Katie had a hard time trying not to stare at its stubborn tumescence.

"It happened," her mother repeated blandly. "Just like that?"

"I... I walked on him masturbating," she said, deciding that in these circumstances, the fact that her brother was jacking off wasn't exactly shocking news anymore, "and I, uhm, dared him to finish with me watching..."

Katie's mother raised an eyebrow, but otherwise didn't do much to acknowledge her daughter's explanation. "Ethan? What do you have to say?"

"I, uhm, well... I don't have anything to add. Mom," he tried to weasel out. "Katie's telling the truth!"

To everyone's surprise, Mom let out a hearty chuckle. "So! My son is finally admitting that it is not 'yogurt' that I would sometimes find dried up on his desk," she said in obvious amusement. "All it took was me discovering that he's been having sex with his sister! Lovely. Anything else you kids want to share?"

The siblings exchanged confused looks, unsure what else to say. They still had no idea what their mom thought about this, the two of them engaging in incest. She hasn't yelled at them at least, or told them to move out, so perhaps all wasn't lost yet?... Come what may, Katie figured that she and Ethan should at least present their case.

"Mom, look... We are just having some fun. I'm not gonna fall in love with Ethan -- more than I already love him, that is -- or marry him, or heaven forbid have his babies!" Katie shuddered at the very thought. "We were just bored, and horny. I'm on the pill, and Ethan... uhm... hasn't done it before, so nothing's bad gonna happen, Mom."

Katie's mom shook her head, crossing hands under her breasts, "Honey, this is called incest. Regardless of what I think about it, the law says it should be illegal."

"No one has to know, Mom," Ethan chimed in, finally having the presence of mind to cover his exposed crotch. "Like Katie said, we aren't dating or anything... We are still just brother and sister."

"...who also happen to sleep with each other, eh?" his mom said, and scoffed lightly. "Isn't that wrong?"

"We don't care --" they both started, then realized they were speaking simultaneously. "We don't care what people think, Mom," Katie continued, smiling at Ethan who was evidently of the same mind. "We aren't hurting anyone, and we have nothing to be ashamed of. I wish you could see it this way, too..."

For the first time, their mom smiled. "I understand that, Katie. I can't say that I'm very enthusiastic about you engaging in this sort of thing, but you should do whatever makes you happy. Honestly..." she started, then dropped the thought. "Nah, never mind."

"What, Mom?" Katie insisted. "We want to know what you think..."

Mom's smile turned into more of a smirk. "Well, if you insist... I was gonna say that I am not _entirely_ surprised that this happened. For one, Ethan has been looking at you like a snack from the very moment you stepped into the house."

"Mom!" The boy cried in embarrassment. "...You noticed?"

She rolled her eyes. "I am not as oblivious as you think I am, young man. Your sister is a gorgeous woman, but that was more than brotherly appreciation of her beauty. Sometimes, you were just blatantly staring, you know..."

Ethan gasped, blushing as he hung his head in shame; Katie couldn't help but let out a girlish giggle.

"And you, young 'lady'," her mom turned to her, and actually used air quotes to emphasize her point, "you are even more boy-crazy than I thought! Your own brother? Really?"

It was now Katie whose face went beet-red. She fidgeted in place, staring at the cutting board with condiments for the still-unfinished sandwiches she'd been making.

"In all honesty, though," her mom spoke again, her voice lower and a bit quieter, "I think it might actually be good for the boy. At least he won't be jerking off so much."

"MOM!!!"

She laughed. "What? Have I said anything that is not true?"

Feeling very seen, Ethan used a second hand to cover his chubby penis, then skipped behind the counter next to Katie. His sister smiled at her lover, realizing, to her astonishment, that even in this tense situation her pussy tingled from the mere presence of her studly brother. She would love for him to just bend her over the counter and fuck her right then and there, but that was obviously not an option at the moment.

"Well..." Katie decided to risk a more explicit admission. "If that's not saying too much, I'm kinda trying to teach him stuff as we go along... Sex stuff, I mean. He's been a very fast learner so far!"

"Oh, was he now?" said her amused mom. "Looks like you found the one topic, other than video games, that actually interests him!"

"Oh my god! YOU TWO!" Ethan cried in exasperation, which only made both of them laugh. The tension was definitely abating, and Katie was starting to think that maybe her summer plans weren't completely ruined after all. Mom seemed cool enough with the two of them fucking, and it looked like it shouldn't be much of a problem if they continued... Question was, could it mean she would tolerate them doing it even when she was at home?

"Mom, speaking of Ethan's, ahem, education," Katie chanced. "I made him a promise... He was to have an unrestricted access to my body, whenever he wanted me. I'd stay nude at all times, to get him more accustomed to what a naked girl looks like. He was supposed to stay naked, too. Now I'm wondering if this is still on the table..."

Mom's eyes went wide. "You kids want to be nudists now?"

"Uhm, yeah... Although not quite. This would definitely be *sexual* nudity, Mom. That's the whole point!"

"Huh..." Her mother pondered this for a moment, glancing at her already nude children. "I don't mind you going around the house like this, though you better put some towels when you sit somewhere," she said with a chuckle. "But you're saying you also want to have sex wherever the feeling strikes you, and I just don't know about that... What if I'm in the room, too?"

What the hell? Katie was astonished that Mom didn't simply shoot her down instantly! Her objections were completely reasonable, of course, but Katie was now too excited about the idea of complete sexual freedom, for her and her brother, to let go of it so easily.

"Would it bother you, Mom?"

"To see my children fuck?" she said the naughty word so casually. "That's not a question a mother is supposed to think about, Katie..."

"Okay, that's fair. How about you just tell us to get lost if we get too distracting?"

Katie feared that she had definitely crossed the line, but her mother just laughed. "Right, maybe I'll tell you lovebirds to go get a room," she said in jest, "and as long as it works, then perhaps..." she trailed off, thinking about it some more. A few long seconds passed until she sighed and finally said, "Okay, I can't believe I'm actually agreeing to this, but if that's how you kids want to, uh, explore your sexuality, then go off I guess!"

"No way!" Ethan jumped in. "You are the best mom ever!"

"The absolute best!" Katie agreed. "In the whole world!"

"Alright, alright! Let's see if I don't regret it," she said with a weak smile, and sighed again. "Now, since you dropped this absolute bombshell on me today, I think it's only fair that you kids should take care of dinner. I'll be in my office if you need me."

With that, she left the sibling couple and walked away. Just before she's gone out of sight, she turned around and said with a cheeky grin, "Just make sure you wipe the counters when you're done."

***

A minute after their mom left, Ethan and Katie were still in a state of shock. They stared at the distance, uncertain what to make of everything that happened just now. Katie in particular couldn't believe that her conceit actually worked. She and her brother now had a free pass to fuck each other to their heart's content!

"You were right, sis," Ethan said, not actually looking at Katie. "Mom is just really, really cool."

His sister giggled. "I know! Honestly, though, this went way better than I expected, like, by far," she admitted, her eyes soon wandering down to her brother's prominent crotch. "Aww, you softened a little... Want me to fix that?"

"Wow, Katie! Are you always this horny?"

"I said I can be very demanding," she purred, "but I think it's mostly your fault, brother. Your cock is all I can think about now!"

He teased her, "So that's why I didn't get my sandwich."

"Shit, you're right," Katie agreed, restraining her impulses. "We really need to fix some dinner. The last thing we want now is for Mom to have second thoughts about all this!"

With her brother to help her around the kitchen, along with her laptop to look up a suitable recipe on the internet, Katie managed to parlay the unfinished sandwiches into a decent-looking bread lasagna. Less than half an hour later, it was already simmering in the oven, allowing them enough time to turn their attention back to other matters...

"Fuck me harder, Ethan! Oh god... Yes, deeper! I wanna feel... every inch..."

Bracing against the counter, Katie was pushing her hips against her brother, eagerly meeting his rapid advances into her sopping wet snatch. Ethan was railing her from behind, driving his hard cock deep into his sister's tight pussy, heavy balls slapping against her sleek thighs. He grunted with each thrust; his muscles were sore from all the physical effort, but he was determined to give his sister the pounding that she clearly loved.

This was the first time they were fucking outside of Ethan's bedroom. It excited him to no end, to have sex with his hot sister, anywhere they liked and at the drop of a hat! It was intoxicating to think that Katie was now his to take on a whim, just like she could jump on his cock whenever he least expected it.

Both siblings knew they'd be (ab)using this privilege a lot in the coming days and weeks. And it was all thanks to their incredibly cool mom, who not only accepted their incestuous relations, but also allowed the horny teenagers to have sex all over the house!

"Uggggh!... I'm coming, Katie! Your brother's cumming in your pussy!"

She moaned throatily, feeling Ethan's massive cock unload in her vaginal hole for yet another time today. It filled her completely, again, and before long there were trails of cum leaking down her inner thighs. Mindful of the possible mess, she reached for a paper towel and tried to wipe herself clean, only for more of her brother's semen to trickle down from her flooded young pussy. Laughing at her predicament, she excused herself to the bathroom, leaving Ethan to take their baked dish out of the oven.

"Smells delicious," he heard his mother's voice, and he turned around to see her smiling. "What is it?"

"Some kind of lasagna, I guess... Katie found the recipe."

Ethan's mom looked at him from under the eyelashes. "I heard you just now."

"You -- oh," he said sheepishly. "Sorry. We'll try to be more quiet."

She shook her head, then sat on a bar stool on the other side of the kitchen counter. "I wonder... Was it mainly because she's your sister? Or did it happen simply because she is young, hot and willing?"

Ethan blinked, surprised that his mother would speak to him so candidly. "Uhm..."

"You don't have to answer, of course," she said, glancing sideways. "I'm just curious whether my son grew up to be like most teenagers, who'd jump any pretty girl who smiled at them nicely..."

He felt his cheeks getting warm, and it wasn't the heat from the oven. "I... well, you know..."

"Oh, don't get so flustered! Nothing wrong with doing what the nature intended," she said reassuringly, and Ethan thought she even saw her wink. "In your case, I'd say it's about time. Sister or not, this girl seems to be the exact right kind of 'bad influence' that a boy like you could use..."

Not entirely sure what his mom meant, Ethan simply spoke his heart. "I love Katie, as a sister. But it's like, impossible not to notice how hot she is! When she asked me if I would like to, uh, have sex with her, I just couldn't resist..."

There was a brief silence between them, until Katie's voice could be heard down the hall. "Did you get that lasagna out of -- Oh, hi Mom..."

"Hey," her mother said, smiling, yet looking over Katie's naked form in a way that made the girl blush. "Seems like you guys have cooked us something really good. And you cleaned up your mess, too! Very nice..."

"Uh, thanks Mom," said Katie. "Please, take a seat!"

Understandably, dinner was a little awkward. Ethan kept glancing at his sister's exposed breasts, getting caught by his mom and feeling embarrassed about it, then realizing he shouldn't really feel like that anymore, then somehow forgetting it when Mom noticed him stare at Katie's chest again. After a few more rounds like this, Katie caught on to the fact that both of them were essentially looking at her boobs most of the time, so she made a show out of sitting upright and puffing her chest as she giggled.

"Poor Ethan has trouble concentrating on his food!" said Mom, chuckling. "What have you done, Katie? The boy needs to eat if he is to keep up with you!"

"Oh, don't worry Mom! He's been keeping up just fine, for the most part," the girl said, teasing her brother, then rubbing his shoulder in reassurance. "He does not disappoint where it matters, I can tell you this much!"

"Really? How many times?"

"Mom!" the siblings cried in unison.

"Nuh-uh," their mom didn't relent. "If you are going to fuck like rabbits wherever you want, then the least you can do is indulge your old mother's morbid curiosity. So?"

Ethan protested, "Mom, you are not old!"

"Shush, bro, I'm counting," Katie chided him. "Ugh, six times maybe?... We kind of just rolled through the day, so I wasn't really paying attention. Then we got hungry and came downstairs, and... well..."

Katie's mom looked at her with raised eyebrows, and threw the same glance at Ethan. Shocking both of them, she then bent down and looked under the table, chuckling as she spied her son's latent erection. "Oh my! And it seems my boy isn't even done yet," she said, her voice betraying a hint of pride. "Someone needs to take care of this, and soon!"

Katie wasn't sure, but there was something about the way Mom said it that implied it might not have been his sister that she had in mind...

"Well, that can't be me!" Ethan said with a laugh. "It is forbidden for me to jack off; Katie's orders!"

"Yeah! Don't even think about it, brother," his sister said, reaching under the table to stroke his rock-solid hard-on. "This is *my* job now! Finish up, and we can go upstairs..."

"Absolutely not," their mom interrupted, sporting an almost mischievous smirk. "Ethan needs to put some meat on his frame. He should have seconds."

"But Mooom!" Katie whined, for a moment sounding like a petulant child. "I want Ethan to.... ugh, you know!"

"To fuck you? Yes, honey, you can use adult language with me," her mom said, still smirking. "And I don't understand what's the problem. Wasn't this the whole idea? Any time, any place?..."

Was this a challenge? It sure felt like one to Katie! Could she actually go through with it, like she had promised, and allow Ethan to use her body even with their mother sitting right across the table?... Fucking her brother was one thing, but doing it right in front of Mom was on an entirely different level! She realized she could be in over her head, but that didn't mean she wouldn't swim deeper, right?

"Scoot away with your chair, bro," she commanded, waiting for Ethan's hard cock to emerge from behind the tablecloth. The moment it popped, Katie stood up and straddled her surprised brother, holding on to his shoulders as she sank onto his rigid shaft. When the pleasurable gasp died on her lips (as did the more astonished one on her mother's), she twisted her body to the side and pointed at Ethan's unfinished meal with an immensely satisfied grin. "Bon appetit, dear brother! You'll be okay eating and fucking me, right?"

"You are incorrigible!" Katie's mom sighed in exasperation, her eyes glued to the mating couple. But she wasn't even sure she believed her eyes; she just snorted a laugh at the ridiculousness of the whole situation. "Alright, this works. Just don't break the chair, okay?... Kids?"

They didn't seem to hear her, though. Ethan and Katie were really fucking now, largely oblivious to their surroundings. Funnily enough, it was his sister who fed Ethan bites of lasagna, using her impressive flexibility to scoop up the food while she was grinding against her brother's crotch. He didn't have to do more than simply chew -- and feast his hands upon his sister's sleek body, of course.

Their mother eventually shook her head, smiled weakly to herself again, and left the kids to enjoy their impromptu encounter.

At least doing the dishes would be on them, too.

***

When Linda woke up in the morning, she thought she just had a really weird dream. She remembered coming back from work, but for some reason her children were naked?... And they were eating dinner, and something happened there... She wasn't exactly sure what.

"Oh god, Ethan!... Yes! Just like that! Fuck me, brother, fuck me, fuck me, fuck meeeeeee!!!"

...Oh.

Ooooh!

Right -- now she remembered.

Ethan and Katie were having sex. They were having sex *with each other*. They'd been bored and horny, and apparently it just sort of... happened. Like any mother would, Linda wasn't exactly pleased to learn about this. But like few mothers would, she decided she wasn't going to prohibit it. After all, she trusted them. They were adult enough, and 'incest' was just a silly word. They were simply having fun, and no one was getting hurt by it. So, she decided she'd just let them be.

But then Katie kept pushing.

The two of them wanted to stay nude, at all times, including around their mother. And apparently, they had this agreement that they were both fair game for each other: if one of them wanted it, then they would just start fucking immediately, right on the spot!

Initially, this seemed insane to her, but Linda believed in freedom above all, so it wasn't long before she started looking for excuses to justify this arrangement. They were young; their hormones were raging; Katie has always been promiscuous; Ethan was having sex for the first time and he needed a lot of practice; it was summer; they wanted to experiment -- lots of good, valid reasons.

But there was one more, the most important one of all... She didn't admit it to herself until later, but that didn't prevent her from granting her kids' the sexual freedom they desired.

"Give it to me, bro!... Fuck me! Fuck me with your huge cock!... Ooh, oooh, ooooh!... Yes! Ooh, oooh, ooooh, oooooh, ooooooooooooooooooh!..."

And boy, were they taking advantage of it! Before dinner, *during* dinner, after dinner, at least once more later in the evening, and of course they slept together, too. Judging by the sounds coming from Ethan's bedroom, today they picked up exactly where they left off last night. Linda was sure they'd be fucking when she leaves for work, and she suspected they would be going at it when she comes back home, too. There was just no stopping them; her teenagers were simply insatiable!

And Linda just couldn't tolerate it anymore.

Which is to say, she couldn't tolerate being left out!

It started with Ethan's dick, of course. Linda noticed it immediately, even before she learned of their incestuous activities. She had touched herself in her home office, thinking how it would feel to get pounded by such awesome specimen. Her husband, that cheating bastard, was no slouch in the cock department, but he had nothing on his own son. Ethan had to be over 10 inches long! And he had balls to match, too. No wonder the boy had to masturbate so often: they must be filled to the brim with hot, teenage cum!

But it hasn't been only about her son. Though Linda wasn't particularly into girls, save for a few encounters in college, she now found herself strangely attracted to her tall, athletic daughter. She had that carefree, effortlessly sexy attitude about her, and she simply radiated youthful vigor. To her own shock, she found herself wondering what her pussy would taste, especially when filled with her brother's warm seed...

Indeed, that was the hottest thing: the two of them actually fucking. She got a glimpse of it when they started having sex at the dinner table, and it got her so horny that she had to leave in a hurry. Even before that, she couldn't help but to egg them on, and she was thankful Katie somehow interpreted her allusions as just Mom being mom. For all her sexual experience, her daughter could be so naive sometimes...

"Oh my god, Ethan... You are so deep! Fuck! Your cock... I fucking love it!.... Aaaaah!"

Mmm, yes, Ethan's cock... When Linda left them after dinner, she went to her bedroom to spend some quality time with her trusty 8" dildo. Pushing it into her sopping wet snatch, she imagined it was her son's much bigger cock ravaging her mature pussy.

But she wondered: would Ethan even want to fuck her?... At 5'6", she was shorter than Katie, and she had nowhere near the fitness model body of her daughter. However, Linda more than made up for it with her generous curves, including large boobs and enticingly flaring hips. Her Asian heritage showed in her cute face, still looking the same at almost 40 years old as it did when she was only 20. Overall, Linda was a sexy, voluptuous woman. Surely a young buck like Ethan wouldn't pass on the opportunity to sample her feminine charms?...

Well, she wasn't sure, but she could at least stay optimistic. Like almost all teenagers, Ethan thought with his dick; he admitted as much, saying that Katie was simply too hot to ignore. If Linda could steer his lustful attention towards her, then perhaps she would get to feel her son's thick shaft stretching her pussy, too.

...Not that she wanted to drag him away from Katie. No, not at all! See, Linda wanted to have sex with *both* her children. After a failed marriage, and years of shoddy dating life that followed, her curvaceous body was desperately yearning for attention. Her own kids has just showed her how crazy and passionate sex can be, and it was all she could think about anymore!

"Keep fucking me, Ethan! I need your cock in me... Fuck me, bro! Then fuck me again... and again... and again... Oh yeeees!"

Thankfully, Linda had the foresight to set the alarm clock half an hour early. Her quivering pussy definitely needed another workout.

***

Ethan put down the dumbbells and wiped the sweat from his brow. He knew better than to push himself too much, especially the first few times, but he really hoped the results would come quickly. He urgently needed to get in shape, both in strength and endurance, or else he'd never be able to keep up with his super-fit sister. And he really, really wanted to...

Breathing hard, he hopped on the treadmill and set it to a light jog. It was liberating to exercise in the nude, even though his semi-hard dick would often flop around as he ran. At least that body part of his, the most important one, appeared to be in excellent shape. It never failed him during the yesterday's sex marathon with Katie, and then he was up and ready to continue fucking her in the morning, too!

Ethan thought, jokingly, that it was all those years he spent jerking off that prepared him for the never-ending trysts with his sister. The true reasons, of course, had more to do with Katie herself. She was incredibly hot; totally shameless; hornier than maybe even he was; and sexually demanding in just the right way that made Ethan rise to the occasion, time and time again.

For the last 24 hours, the two had been inseparable, rutting like wild animals and rocking the house with Katie's endless cries and moans. This was really the first time they gave each other some space, and put their nonstop fuckfest on a short, very much temporary hold. Ethan used the break to go to the basement gym, like he had planned, while his sister finally got to do something about those pesky tan lines.

But even as he trained, sex was constantly on Ethan's mind. He kept thinking back to their lurid sessions, including possibly the craziest one of them all: when they started fucking right at the dinner table, in full view of their mother! He still couldn't believe Katie has convinced Mom that this would be just fine -- that she should simply let them walk around naked and fuck wherever they pleased.

What mother would allow that? Only the coolest one, that's for sure! His mom was truly the best mom in the world, he thought. He pictured her standing between him and his naked sister, biting her lip as she tried to make sense of it all.

It was really cute.

His mom's face was cute, and very pretty.

Actually, the more he thought about it, the more he had to admit that Mom was just a very pretty woman.

Was 'pretty' even the right word, though?... No, Ethan realized. He only used it to conceal -- from himself no less! -- what he really thought about his mom.

She wasn't just pretty: she was hot! Those enticing curves, seductively accentuated by her body-hugging sweater and tight jeans... She wasn't dressed to impress, as she had just come back from work, but Ethan's subconscious had definitely picked up on her undeniable sex appeal. It was only because he'd been distracted by Katie fucking his brains out that he didn't realize it much sooner.

Ethan's mother was a MILF, and the "I" in there? That was him!

He slowed down the treadmill to a stroll, his cock rock-hard from the obscene fantasies he was now indulging in.

Mom was naked and on all fours, moaning his name as he drove his rigid meat into the steamy hot depths of her mature vagina. The same hole Ethan had come out from, he would now pound as hard as he could, hips bouncing against the soft butt cheeks of his voluptuous mother as he railed her with his massive cock. Her large, pendulous breasts would sway from the force of his long thrusts, and she would cry and groan as she creamed herself repeatedly upon her son's huge shaft. In his fantasy, Ethan would have no problem fucking his mom for hours, giving her more orgasms than she thought any woman could ever experience!

"Fuck, I need to cum," he said out loud, looking at his throbbing erection. It was tempting to just rub one out right there, but he knew a girl who would definitely appreciate if he brought her a big hard-on. His cock-hound of a sister was currently sunning her nude body in the backyard, so that's exactly where Ethan went next, right after a quick shower.

Sure enough, she was lying on a chaise lounge by the pool, eyes closed as she enjoyed the late morning sun. Quietly, her brother crept behind her and waved his swollen cock right above her lightly smiling face. The turgid shaft and the engorged balls cast a long shadow over Katie's neck and chest, and she opened her eyes to check why the sun was suddenly all gone. She saw there were no clouds in sight, but the sky was still darkened -- by her brother's enormous dick.

"Bro, I'm trying to get a tan here!" she scolded him jokingly, the smile now turned into a big grin. "Back from the gym already? I can see there's at least one muscle you have really pumped..."

"Yeah," he said simply. "I got horny."

"Been thinking of me, stud?" she purred sultrily, her hands reaching up to stroke his achingly rigid cock. "Wow, it really got you worked up, huh? Well, tell me what it was, brother! We can make that hot fantasy of yours come true..."

"Uhm... that might be difficult," he said cautiously. "I was actually thinking about Mom."

"Yeah, I still can't believe we are getting away --" she started, then suddenly stopped rubbing his cock when she realized what her brother actually meant. "Whoa! You really have been *thinking* about Mom! And it got you hard!" Katie said, letting out a lighthearted chuckle. "Damn, bro! That's fucked up," she added, then simply resumed stroking his large erection.

Ethan was dumbfounded. "You-you're not mad?"

"At you? When I have my hands on your huge cock, and I'm pretty sure it won't be long before it's going inside my wet pussy? Yeah, I don't think I could get angry with you right now," Katie said with a laugh, then continued in a sultry tone. "But maybe I should?... If you were fucking Mom, would you still have time for your horny big sister?"

"Always," he said, ogling her naked, glistening body. "Forget about Mom! Let's go back to bed, sis."

She giggled. "Do I have to remind you again, brother? Anywhere we want," she said huskily, turning around and getting on her hands and knees. "My pussy is always wet and ready..."

Ethan didn't need to be told twice. He moved behind his sister and lined up his stiff rod against her vaginal opening. Much more confident than he was just the day before, he pushed his rock-hard cock deep into his sister's dripping snatch.

He didn't know it, but Katie had been fingering herself as she lay out there in the sun. staying wet and horny for whenever her brother would come back to ravish her. She didn't really need much in the first place, as Katie was practically always ready for sex now, but she'd tease her clit all the same, driving her insatiable libido to whole new levels.

"Oh fuuuuuck! I missed your cock so much!... Fuck me, Ethan! Fuck your slut of a sister! Make her come on your huge prick!"

Ethan gasped. Until now, he hasn't heard Katie say that she was a slut, not even in the deepest throes of their shared passion. It surprised him just how hot it was, and he started fucking her harder.

"Are you... a slut... sis?" he asked, in between his deep thrusts.

"Oh yeeeees... I'm such a slut... that my own brother... fucks me... whenever he wants!"

"And you like it," he said, finding the confidence he didn't think he had.

"I love it!... Oh god... I never want him... to stop fucking me!"

His pride soaring, he added on a whim, "What about Mom?"

"He... he can fuck her too! Oh yes... That'd be soooooooo hot!"

Katie was almost out of her mind with lust -- almost. What she was moaning out, as her brother pounded her slutty pussy, was exaggerated to be sure, but also more or less true.

When Ethan told her that he was hot for Mom, it wasn't the first time Katie thought about their mother in a sexual context. She definitely wasn't truly bisexual, but Katie found herself attracted to women on a number of occasions, particularly in college, but also back in high school. Her nearly boundless sex drive, and a very casual attitude, led to more than instance where her current boyfriend would sweet-talk her into a threesome. She always enjoyed making out with another girl, even if it was mainly for the guy's benefit, and would typically find herself fooling around with the female extra long after her boyfriend was spent, and snoring.

On her own, however, Katie didn't usually go for women. The thought of her mom getting involved in their incestuous activities hasn't really entered her mind, not until Ethan mentioned it. Sure, Mom had already "involved" herself, when she normalized their son and daughter having sex all over the house, but that only made her a passive bystander. Could they get her to actively participate, too? Katie wasn't sure. It was too complex to ponder right now, with her brother's cunt-splitter making her shudder with every slide into her slick pussy!

"Hah!... You really are... a slut," Ethan groaned, a fresh load of cum boiling in his bloated nuts. "Maybe you would even... fool around with Mom yourself?"

"Fuck yes!... I'd eat my brother's cum.... out of her pussy... in a heartbeat!"

This was getting too much for Ethan, who had been a virgin only a little over 24 hours ago. With a final, strained groan, he spurted what felt like ounces of his hot jizz deep inside his sister's clenching pussy. It set off Katie to her own powerful orgasm, and she cried out in ecstatic pleasure as her brother blasted his seed into her, one wave after another.

She eventually just collapsed on the lounge chair, overwhelmed by the intensity of her climax. The last few shots of Ethan's cum landed on her lower back and ass. She lay like that for a few moments, savoring the afterglow, until she felt something warm and thick rest in the valley between her taut ass cheeks.

"Don't mind me, sis," said Ethan. "I'll just use your ass crack like this... It doesn't count as jacking off, right?"

Katie snorted a laugh. "Be my guest, bro! And it does feel pretty nice, actually," she said, twisting her head to watch her brother slide his big, still hard cock along the cleft of her shapely derriere.

She winked at him, rather impressed by his rapidly growing boldness. Her seduction of Ethan, unplanned as it was, has already paid off massively -- not only in countless orgasms, but also in the pleasant comfort of always having access to her brother's hard cock. It was exactly what Katie's horny pussy needed, and a great start to a summer filled with sex.

Now she just had to figure out how to get Mom to join in.

***

All throughout the day, Linda has been feeling very sexy.

The outfit she had picked has definitely contributed to it, as she was clearly pushing the limits of her company's generally permissive dress code. A white, semi-transparent blouse with a prominent cleavage, and a pair of tight yoga pants that highlighted her large butt -- those were very much on the edge of what could still pass as "professional", even in the laid-back software house where she worked.

If the guys there weren't so intimidated by some bitter and sad bitches who would report anything off-color to the HR, Linda would likely have enjoyed plenty of suggestive compliments. In this day and age, however, she had to be content with perhaps catching some furtive glances, all promptly averted before she even had a chance to smile.

Not a huge loss, she thought; these weren't the men she wanted to impress with her flattering getup. Rather, it was about one particular man: her son. It was one part of Linda's plan to get the young stud to notice his sexy mother, the other being a much more revealing set of clothes that she would now be wearing at home. What she wanted was to capture Ethan's attention from the moment she walked into the house -- a tall order, really, considering what he'd likely be doing at the time...

"Hnnng!... Hnnng!... Ooooooh!... Yes!... Right... there..."

Yup, she was right: they were, in fact, still going at it like bunnies! This time, they even picked not only a spot outside of their bedrooms, but also a rather lewd position. Linda saw that her son was kneeling on the floor, right here in the living room, in front of a couch that her daughter was "sitting" on. In reality, her perky butt was hanging beyond the edge of the cushion, and she was holding on to the back of the couch for purchase, all while her sleek muscular legs were swung over Ethan's shoulders.

Elaborate though it was, this position opened up Katie's pussy and allowed her brother to fuck it freely, with nothing to stand in the way of his huge cock. Needless to say, Linda's daughter was shrieking like a banshee, cumming repeatedly as her brother pounded her without mercy. They were both dripping with sweat; they must've been fucking like this for quite a while now.

And Linda couldn't help but stare. She leaned across the kitchen counter and just... watched. She didn't even feel like touching herself, though her pussy was obviously dripping. Instead, she simply admired the lurid spectacle -- this beautiful display of pure, carnal passion. For the next ten minutes, Linda was totally mesmerized, until the loud roar of her son's powerful orgasm brought this erotic masterpiece to a close.

"Ahem," she cleared her throat, pretending that she came in just now. "Kids, it's me. Try not to make a mess when you stand up."

Katie looked at her groggily, still experiencing the aftershocks of her nearly continuous climax. "Moooom... Ethan is fucking me sooooo good!" she said rapturously, a smile of pure bliss painted on her tired face.

"Glad to hear it, sweetie," Linda replied, feeling naughty to carry on such a conversation. "Have you been doing this all day?"

"More or less," Katie said dreamily. "Ethan worked out for a bit, then we had some quick lunch, but other than that... Yeah, Mom, all day..."

Life's not fair, Linda thought. While she had to deal with a botched database migration, her children literally fucked the day away! She had to be patient, she told herself. Just a few days, or maybe a week or two, and they'll realize that Mom is just as much a sexual creature as they are. And when that finally happens... oh my!

"You must be starving," she said, out of genuine care. "Get your butts in the shower while Mom makes you something to eat!"

"Thanks, Mom," Ethan said, helping his sister stand up. "You really are the best!"

The siblings waved back to their mother, then quickly made their way to the bathroom. They were in a hurry to take that shower, although washing was of secondary importance. Even though they have been screwing on the couch for the past hour, not to mention other places throughout the day, Ethan was inside his sister as soon as the water was running. Their sexual appetites remained robust, whetted rather than dulled by their constant rutting, and that was all the better for pulling off their new scheme.

"Oh, Ethan... Not that I'm complaining... but shouldn't we wait until Mom's around again?"

"I want you now, sis," said Katie's brother, pushing her against the shower wall while he thrust into her from behind. "Don't worry, we'll do it again in front of her later."

Their plan was precisely that: to flaunt their incessant mating around Mom, as often and as obnoxiously as they thought they could get away with. It was their hope that she would get horny, watching her children fuck, and...

Well, that point of the plan was essentially three question marks, but the intended "profit!" part was to have her strip naked and join the sexy fun times. Katie came up with this, and even she thought that it was rather far-fetched, but hey, why shouldn't they at least try? At "worst", they'd have even more, and even naughtier sex!