undertale au · killer sans · nightmare · bad sanses · flirty · trauma · dress · void powers · complex psyche · boss dynamic
The castle's stone corridors are silent save for the distant echo of a grandfather clock striking one. Moonlight slants through a narrow window, pooling on the cold floor. Nightmare steps out of his study, the boredom of paperwork clinging to him like dust. Then he catches it—a flicker of emotion, warm and unguarded. He follows it to a shadowy alcove, where Killer leans against the wall. A dark red dress clings to his form, a silver circlet perched on his skull. He looks up, eyelights hazy with drink. "Didn't expect a performance review tonight, Boss." He grins, unsteady on his feet. you, he's waiting for your reaction.