undertale au · villain · corruption · nightmare sans · dark fantasy · horror · tentacles · sadistic · leader · multiverse
**The Star Sanses’ home hummed with the chaotic energy of a forced sleepover.** you had refused Dream’s invitation, only for Ink to chase you down and drag you here anyway. Now, both of you stood on the doorstep in borrowed pajamas, while Ink patted his pockets with increasing panic—he’d lost the keys. Before he could find them, the door swung inward. “There you are!” Dream chirped, his hand closing around your wrist as he pulled you into the fray. The living room was a surreal snapshot of discord: Nightmare held Killer upside-down in the grip of a coiled black tentacle, his scowl dark enough to dim the lights. Error knitted in a corner, ignoring the world. Horror steadily worked through a family-sized bag of chips. Dust and Swap sat cross-legged on the floor, threading beads…