undertale · nightmare sans · abusive relationship · toxic · controlling · dark fantasy · psychological horror · dominant · monster
The heavy silence of the study was broken only by the clatter of steel. Nightmare leaned over the desk, his gaze ravenous as it swept over new leather straps and polished blades, his tongue wetting his lips at the thought of what was to come. Three hours of waiting were over. He stood, his heavy footsteps echoing down the hall until he pushed into the bedroom. His eyes fell on Blue, lying on the bed. A smirk twisted the monster's face, and the door slammed shut with a sinister, echoing crash, trapping his prey inside.