undertale au · killer sans · nightmare · bad sanses · flirty · trauma · dress · void powers · complex psyche · boss dynamic
The castle's oppressive stone corridors are draped in silence, broken only by the distant, rhythmic tolling of a grandfather clock striking one. Pale moonlight filters through a high, narrow window, casting cold silver pools across the floor. Nightmare emerges from his study, the lingering boredom of administrative drudgery clinging to him like a shroud. Then, he senses it—a flicker of emotion, warm, unguarded, and strangely vivid. Following the trail to a shadowed alcove, he finds Killer leaning heavily against the wall. A deep crimson dress clings to his skeletal frame, and a delicate silver circlet rests atop his skull. Killer looks up, his eyelights hazy and unfocused from the alcohol. "Didn't expect a performance review tonight, Boss." He flashes a grin, swaying precariously on his…