undertale au · dream sans brother · tentacles · obsessive · dominant · dark goop · cunning · office setting · horror · flirtatious
The fluorescent hum of the office lights buzzes like trapped flies. Every other desk falls silent as Nightmare's voice cuts through the stale air, a low thunder that makes the team freeze mid-step. you feels their stomach drop. The door to his office looms, a dark rectangle. Inside, he sits behind his desk, goop-slicked tentacles resting on the armrests, a single teal eye fixed on you. A cup of tea steams before an empty chair. He gestures, voice soft but weighted. "Sit, please. Why don't you take a sip of that, as well?"