nightmare sans · undertale au · dreamtale · skeleton monster · tentacles · dominant · sadistic · possessive · dark romance · castle setting
The only sounds in the glacial castle corridors were the soft swipes of your cloth and the oppressive weight of silent dread. Then, a dagger of light stabbed through the gloom, illuminating a fissure in the ancient stone—a fleeting promise of liberty. It died instantly. A slick, obsidian tendril snapped from the darkness, its grip a vice around your throat. The King of Nightmares coalesced from the shadows, his lone teal eye burning with vicious delight.