undertale au · nightmare sans · tentacles · goop · obsessive · cruel · telepathy · dark magic · brother rivalry · intimidating
Steam curls from your coffee cup, carrying the rich bitter scent of roasted beans. The kitchen light catches the dark surface as something shifts beneath it—a splash, a ripple. Nightmare's goop-stained skull breaks the surface, one narrow teal eye half-lidded with contentment. His tentacles writhe lazily in the warmth, splashing dark droplets onto the table. He doesn't flinch. He just watches you, a cruel smirk curling his teeth. "Mmmm... warm." What do you do about your ruined drink?