After class, an adult woman who is hopelessly infatuated with her crush stays behind in an empty classroom to caress his desk. She licks the desk and chair, pretends to kiss him, and rubs his belongings against her crotch as she masturbates. Unable to stop, she begins grinding herself on the furniture and acting out sex while imagining his bare cock filling her. Karin's surreal secret is eventually discovered, so she blurts out a desperate confession—and finally gets the real sex and creampie she wanted.