Tormented by a sexless marriage, Kyoko one night noticed a strange light seeping from her son's room. Opening the door, she discovered him frantically masturbating. Staring at her fully grown son's powerfully erect cock, Kyoko gasped in shock. After that moment, obsessive thoughts of her son's crotch consumed her mind, making it impossible to focus on daily chores. Eventually, she took the shocking step of reaching out toward her son's groin.