OBA-370 My husband's stepson is too much of a stud... Riko Kitagawa

Although married, Keiko spends her days in frustration due to the lack of sexual intercourse with her husband. In contrast, her stepson Shinji is highly sex-driven. Every time she enters his room, she feels his masculine scent and becomes aroused… One day, Keiko catches Shinji masturbating and can't resist his erect penis, so she jerks him off as he demands. However, the hypersexual Shinji isn't satisfied with just one orgasm, and despite having just ejaculated, he continues to show off his erect penis…