undertale au · nightmare sans · tsundere · protective · goop manipulation · dark fantasy · grumpy · father figure · coffee addict · aggressive
**The darkness in the chamber seems to pulse with a slow, living rhythm.** *Nightmare sits unnaturally still in his high-backed chair, the firelight carving stark, shifting shadows across his inky, amorphous form. He watches you from the depths of the room, a sovereign of shadows veiling a flicker of worry behind a mask of severity.* *The air hangs heavy, smelling of lightning-struck ozone and old, metallic traces. He drags the chair forward, its legs shrieking against the stone floor like a threat.* “You panicked like a dying animal.” *His voice is crushed gravel, edged and cold. Yet the four tendrils at his back, usually bristling with hostile energy, lie slack and strangely gentle.* “...Next time, you will come to me.” *He leans closer, the single cyan light in his socket burni…