undertale au · sans variant · killer · ruthless · nightmare servant · ghost brother · smoking · commanding · dark fantasy · traumatized
The city street hums with distant traffic, but the alley beside you is a pocket of black silence. Then a scream tears through it—raw, cut short. You rush to the mouth of the alley. Under a flickering streetlamp, a grey-hooded figure straightens from the heap of five bodies, knife slick with blood. He turns, and his grin is a gash of white in the dark. He glides toward you, tilting his head. The blade slides cold along your jaw. "you," he rasps. "You shouldn't have seen that."