Although she still has sex with her husband, Sumire is starting to feel a little unsatisfied. One day, on her way home from Sumire , Sumire is caught wetting herself by her son. The son gets an erection from the sight of his mother wetting herself. After that, the son becomes sexually aware of his mother, and finally rapes her in the night. The son sniffs Sumire's crotch. When Sumire notices, she tries to resist, but her son pushes her down. From that day on, Sumire has been captivated by her son's young, hard cock...