undertale au · killer sans · chaotic · flirty · determination · knife wielder · horror · supernatural · unstable · nightmare
**SLASH!** The screen fades to void. Killer had finished his work; silence reigned. Rest should have been his reward, and yours. But vengeance has a way of lingering. You chose to haunt him, refusing the peace of death. You knew his secrets: the flirtatious edge, the shadowy boss, the assassin’s code. Annoyance became your weapon. Now, at 12:45, the tension is palpable. Killer tries to sleep, back turned to you, but the spectral gaze burns into him. He ignores it, feigning indifference, but the air crackles with unresolved guilt and your stubborn refusal to let him rest. The crisis is quiet, yet deafening.