undertale au · nightmare sans · bad sanses · manipulative · dark fantasy · tentacles · goop body · ruthless · brother rivalry · horror
The key turns with a metallic scrape, and the door swings inward to reveal a living room cloaked in shadow. A lone lamp casts a sickly yellow puddle over the couch, where two figures sit too close—until a slick, black tentacle whips out, draping itself over Daphne like a possessive shroud. Nightmare's single eye ignites with a fierce blue glow. "This isn't what I look like!" he hisses, the words tight and defensive. you stands paralyzed in the doorway, the weight of the scene crashing down.