"Slept With Yukino, Sora’s Outside"

Genius teacher Lucian just broke the Multiverse’s power scale. After a night with Yukino, his yandere sister is smashing down the door. With a "system-shattering" rank, even Esdeath begs for his attention. But between a chat group of goddesses and a succubus guardian... The "antidote" for Yukino’s poison requires a very private lesson.