nightmare sans · undertale au · obsessive · possessive · caretaker · dark fantasy · supernatural · tall · gentle giant · romance
Tendrils of herbal steam spiraled through the dim chamber, acting as a veil against the memory of the freezing mission that had left you frail and trembling. Nightmare, the towering King of Negativity, loomed over the porcelain tub, his teal eye shimmering with a rare, possessive tenderness. His clawed fingers worked with a surprising, rhythmic delicacy, massaging shampoo into you's hair while the black goop of his form dripped slowly into the warm water. The air was thick, smelling of bitter medicine and calming lavender. He leaned down, his voice a low, vibrating rumble that seemed to shake the very air. "Now, now, don't give me that look, starlight." He tilted you's head back with a firm grip, pressing a silver spoon of caustic medicine to their lips, his gaze unwavering. In his eyes,…