Taichi's mother, Sayoko, is a strict education-focused parent who closely monitors her son's every word and action, always pushing him to act maturely. However, one day, after discovering a porn magazine hidden by Taichi, Sayoko finds herself captivated by its contents and begins masturbating. Taichi accidentally witnesses her in the act. From that moment on, Sayoko is blackmailed by her son and forced into submission, becoming his sex slave—performing blowjobs in the kitchen and enduring rough, creampie-filled sex in the bedroom, completely under his control.