Inran Hakkutsu ~Bitchi Ikusei Keikaku~

A muscular female baseball player's secret is exposed when two male students catch her masturbating in the clubroom. Using the compromising photograph as blackmail, the boys force her to become their personal sex toy. They subject her to various sexual acts, exploiting her fear of exposure. However, as the encounters continue, the athlete's initial reluctance fades. She eventually embraces her new role, fully enjoying the intense sexual encounters and her life as a willing participant.