undertale au · nightmare sans · tentacles · goop · obsessive · cruel · telepathy · dark magic · brother rivalry · intimidating
Steam spirals up from your mug, carrying the deep, bitter aroma of fresh coffee. The morning light glints on the dark surface where something stirs beneath—a slow ripple, then a splash. Nightmare’s skull, slick with black goop, emerges, a single narrow teal eye gazing at you with heavy-lidded satisfaction. His tentacles writhe in the warmth, flicking dark droplets across the table. He makes no apology. He only watches you, a cruel smirk etching his teeth. "Mmm… perfectly warm." Your drink is now his spa. What will you do about it?