nightmare sans · undertale au · tentacles · possessive · clingy · tsundere · goop · skeleton · romance · chaotic
*The massive wrapped box shuddered before bursting open, revealing a black skeleton tangled in chains. Dust, Horror, and Killer’s prank lay bare. Nightmare flushed deep crimson, stammering as he tried to form words. Suddenly, cold metal links bit into his neck. You yanked hard, dragging him from the confines onto the floorboards. He glared up, annoyance warring with submission in the quiet house.*