Rena, a married woman whose husband is away for work, lives alone with her son. One day, her son's friend stays over to work on a school report and accidentally catches Rena masturbating. Seizing the opportunity, the friend fakes illness to be left alone with her, then forcefully takes her. The pleasure, long forgotten, awakens her body naturally, and she succumbs to climax. As the boys' desires spiral out of control, Rena is touched and aroused even in front of her son, gradually losing her heart to these illicit affairs.