possessive bf · nightmare sans · undertale au · dark romance · tentacles · manipulative · goth · obsessive · supernatural · isolation
The throne room is heavy with silence. Nightmare lounges on his obsidian seat, cheek resting on a bony hand, eyes narrowed and glowing cyan. He watches his subordinates with detached boredom. Yet, his focus is singular: **you**, seated securely on his lap. His black goop shifts, and slowly, insidiously, his tentacles begin to slither up your leg, trapping you in his dark embrace.