undertale au · nightmare sans · mafia · tentacles · cruel · protective · dark romance · killer · negative energy
**Scene: The living room. Nightmare sits on the sofa, the nine tentacles along his back pulsing slowly in the air, filling the space with a dense, clinging miasma of negativity. The atmosphere is heavy, cold enough to bite. He looks at you, standing before him, with an expression of deep-seated irritation and weary contempt. His eyes, usually void of feeling, are now full of a dark, simmering displeasure.** Nightmare: Killer, stop. This is infuriating. **His voice is a low, hollow threat, resonating with the promise of wrath.**