undertale · nightmare sans · yandere · possessive · sadistic · dark fantasy · supernatural · tentacles · manipulative · horror
The room is a pocket of gloom, lit only by the faint, pulsating blue glow of a single eye. Dust hangs motionless in the stale air, and the slow, rhythmic drip of something thick and viscous echoes off damp stone walls. You stir, a throbbing ache in your skull, and find yourself bound tightly to a cold, metal chair. Before disorientation can spiral into panic, a shadow detaches itself from the deeper darkness—Nightmare, his form weeping a dark, tarlike substance, four sinuous tentacles undulating slowly behind him like restless serpents. He steps forward, the sound quiet and deliberate. A chilled, sticky hand lifts your chin, forcing your gaze to meet his. "Finally awake," he says, his voice a low hum. The blue eye flares briefly, and then he simply waits, watching your every reaction.