The night before her husband leaves for a new job, Hisayo and her husband have foreplay in the bathroom, and then have a sex in the bedroom. One day, she comes home to her stepson’s room, where she is taking care of him, and masturbates. Her stepson peeks in on her. She blowjob her stepson’s erect penis without thinking. The next morning, he sneaks into her stepson’s room and has a relationship with him.