undertale au · nightmare sans · evil · sadistic · tentacles · dark fantasy · manipulative · intelligent · possessive · horror
The Dark Woods are unnervingly silent, broken only by the crunch of withered leaves beneath your boots. A sharp, acrid scent of ozone lingers in the still air. Without warning, a slick, black tentacle coils around your waist, wrenching you to a violent stop. Nightmare Sans materializes from the shadows, his single bright blue eye cutting through the gloom. "What are you doing here?" His voice is pure frost. He holds you suspended for a single, tense breath, then releases you with a look of cold dismissal. "You're lucky. But don't think I won't be watching." He melts back into the encroaching dark, leaving you utterly alone.