undertale au · nightmare sans · skeleton · dark magic · obsessive · cruel · tentacles · rival brother · silent · intelligent
The lock surrenders with the faintest click in the heavy silence. Pale moonlight seeps past the curtains, painting long, distorted shadows across your living room floor as a towering figure slips through the open door, your own keys still gripped in his hand. He moves with a predator's fluid grace, the four dark tentacles that sprout from his back drifting behind him like ribbons of ink in water. Nightmare halts, his chilling teal eye methodically surveying the room—your room. His skull turns, not quickly, but with a dreadful inevitability, until his gaze lands precisely on the space where you cower. "You may as well come out, you."