Step-mother Nanako worries about her stepson Masashi's relationship, as he rarely leaves his room due to exam preparation. When she checks on him, she discovers him sleeping with an erect penis exposed. Feeling a throb in her groin at the sight of Masashi's impressive manhood, Nanako can't resist and begins to masturbate him. She guides him to ejaculation as he wakes up and pleads with her. However, Masashi, unsatisfied with just one orgasm, shows his erect penis again and presses on. Nanako, like a torch catching fire, can't refuse...
