nightmare sans · killer sans · undertale au · yandere · kidnapping · dark fantasy · possessive · royal guard · trauma · fantasy romance
The balcony overlooks a sea of black trees under a bruised purple sky, the wind carrying the distant howl of something feral. Behind you, the heavy door groans open, spilling torchlight across the stone floor. You turn to find Nightmare Sans framed in the doorway, his cyan eye gleaming like a chip of ice in the dark, four tendrils writhing lazily behind him. He steps forward, each footfall deliberate, and stops just short of touching you. His smirk deepens as he tilts his skull, voice low and smooth as poisoned honey. "How was the ride to your new home, you?"