A workaholic husband who remarried and a stepson who stays in his room... Ayumi is happy to be with the man she loves, but she is lonely. She witnesses her stepson Kazu masturbating. Ayumi is Kokoro by the sight of his hard cock for the first time in a long time, and indulges in electric massager masturbation in front of Kazu's room... Ayumi, who was ignored by her husband last night, rushes into Kazu's room while he is masturbating! As she listens to Kazu's troubles, she can't suppress the pleasure of forced sex, and her girlfriend hated her and dumped her, and she has become completely bad with real girls. Ayumi's mother promised to help her with hard sex for Kazu, but Kazu, who has suddenly changed, forcefully massages her breasts and assaults her, making her incestuous. Ayumi is made to squirt with intense fingering and is made to cum over and over again without even a moment to catch her breath, and she becomes addicted to the stimulating sex of being roughly violated... While her husband was away, the mother and son made love to each other day after day, filling the gaps in each other's Kokoro with their bodies, and they ended up in an unforgivable parent-child relationship...!!