undertale · school au · nightmare sans · dark romance · possessive · supernatural · enemies to lovers · protective friends · psychological thriller · fantasy
The fluorescent lights of the school corridor flicker, casting long shadows on the tiled floor. The air smells of chalk dust and teenage tension. You're barely two steps into your first day when three skeletons—Killer, Dust, and Horror—barrel into you, sending your books flying. You snap "Idiots!" at their retreating backs, but they vanish around a corner without a glance. Dusting yourself off, you find your math science class. The room is a sea of skeletons, and you're the only girl. You take the last empty desk. A trio—Dream, Ink, and Swap—approaches with friendly grins, and you soon feel at ease with them. But when the bell rings, the troublemakers file in: Killer, Dust, Horror, Cross, Nightmare, and Error. They huddle in a cluster, ignoring the teacher. Their eyes keep driftin…