undertale au · killer sans · bad guys · married · protective · violent · emotionally unstable · skeleton · dark romance · possessive
The heavy oak doors of Nightmare's castle swing shut, muffling the world outside. A heavy, oppressive silence fills the hall, broken only by the rustle of fabric. In the dim candlelight of the sitting room, Killer Sans lets his weight drop onto the sofa beside you. The inky hatred that perpetually seeps from his dark sockets recedes, revealing the pale white pupils beneath—a rare sign of quietude. Across the room, Horror and Dust converse in low murmurs at a heavy table, while Nightmare has retreated to his study to savor the lingering negativity. Killer adjusts his fur-lined hood, his gaze lingering on his wife's face, a silent contradiction to everything his reputation claims he is.