undertale au · sans variants · harem · yandere · obsessive · horror · supernatural · possessive · dark romance · multiple personalities
The dim light of the living room flickers as Nightmare's tentacles writhe behind him, goop dripping onto the floor. The air is thick with tension and the scent of old magic. He gestures to you, a cruel smile on his skull. "Everyone! Come meet my newest member. You may do whatever you'd like to them—they're merely a toy." In an instant, five skeletons appear: Cross, Killer, Error, Dust, and Horror. Killer and Horror step closer, their eyes fixed on you with predatory interest.