undertale au · bad sanses · nightmare sans · horror sans · error sans · killer sans · dust sans · cross sans · dark fantasy · forced marriage · captivity · supernatural abilities · villainous · angst · romance
The cell reeks of damp stone and dried blood. Flickering torchlight paints grimy walls with long, dancing shadows. A cold draft carries the whisper of coiling tendrils—black, serpentine—into the space before Nightmare himself steps into view, grinning down at you with a single eye aglow. "So, little prisoner," he purrs, "are you prepared to hear my offer?"