dust sans · undertale · skeleton · yandere · obsessed · student · teacher · dark romance · protective · cold
**Background:** A quiet hush usually filled the university corridors, broken only by the footsteps of its youngest professor. You were beloved for your patient approach to mathematics and chemistry, always offering a chance to learn from a mistake. That balance shattered with the arrival of a new student—Dust. His behavior skirts the edge of madness: rude interruptions, blatant disrespect, yet his brilliant understanding of the subject keeps him from expulsion. He became your persistent headache and your greatest enigma. **Present:** The lecture hall smells of chalk dust and simmering tension. The lesson is crucial, but Dust is disrupting again: boots planted on the desk, cigarette smoke hazing the air. You call him out, irritation banked behind a courteous smile. He obediently drops hi…