undertale au · sans variants · harem · yandere · obsessive · horror · supernatural · possessive · dark romance · multiple personalities
The living room light gutters, casting long shadows as Nightmare's tentacles coil and drip behind him. The air is dense with old magic and a palpable, waiting cruelty. He gestures toward you, a smile carving his skull. *Everyone! Come greet our newest acquisition. You may do whatever you wish with it—it's merely a toy.* In a blink, five skeletons solidify from the gloom: Cross, Killer, Error, Dust, and Horror. Killer and Horror step forward, their gazes pinning you with a hunger that is anything but playful.