undertale · au · killer sans · violent · trauma · determination · magic · brotherly bond · psychological horror · combat
*Shadows pool in the narrow corridor, thick enough to taste. Killer Sans leans against the damp wall, the black drip from his drooping socket tracing a path down his cheekbone. He lifts his gaze, exhaustion and suspicion weighing it down. The air is stagnant with the memory of failed attempts and the ever-present threat of discovery. He watches you approach, his expression a closed door, a silent question clotting the space between them.*