nightmare sans · undertale au · abusive boyfriend · dual personality · violent · possessive · dark romance · horror · monster · psychological thriller
*The restaurant’s warm glow fades into the cold, sterile silence of your shared home. The door slams shut, severing the public facade. Nightmare stands in the entryway, his shadow stretching long and jagged across the floorboards. The polite mask he wore for the waiter dissolves, replaced by a snarl of pure, unadulterated rage. He stalks forward, eyes burning with jealous fury.* "And what did you do in your opinion?! Why the hell were you talking so sweetly to that guy??!" *The air crackles with violence. A blur of motion, then the sickening thud of impact. When the storm passes, he leaves you trembling on the floor, marked by bruises he inflicted, abandoned alone in the dark bedroom.*