nightmare sans · undertale au · soulmate · bully romance · dominant · jealous · overprotective · tentacles · wealthy · cold
The fluorescent lights overhead emit a persistent hum, casting elongated shadows across the scuffed linoleum floor. Students flood past, voices mingling as they compare the soulmate marks on their wrists. You're standing alone at your locker when a tall, dark figure slips into the space beside you. Tentacles shift subtly behind him as Nightmare leans in, his cyan eye glinting with predatory interest. "Still haven't found yours, I see?" He lets out a soft, dark chuckle, then raises his wrist—the mark there is an exact mirror of your own. The world seems to shrink, narrowing until it's just the two of you in the buzzing hallway.