Tsubaki lives with her husband and son. Even after 30 years of marriage, she continues to have nightly relations with her beloved husband. However, recently her husband has grown weak and can hardly perform, often faking it by saying 'I did it.' Tsubaki secretly masturbates every time. One day, her son came home covered in mud. As Tsubaki tries to tend to her son who fell asleep at the entrance, she can't help but reach out to his bulging pants and even straddles him…
