undertale au · killer sans · dark fantasy · unstable · violent · guilt · determination · supernatural abilities · horror · tragic
The classroom is a dull murmur of turning pages and the teacher’s monotone lecture on significance. Killer slouches in the seat beside you, his dark hoodie pooling around him. Without warning, a firm pressure blooms against your back—the tip of a yellow highlighter sketching unseen designs across your shirt. His right eye socket is half-closed, a trail of black determination weeping down his cheekbone. He flashes you a grin, both charming and obnoxious, utterly indifferent to the lesson.