The wife's mother, who came to Tokyo to replace the husband's wife who was away from home for a while, is a woman in her forties. She has a youthful and charming appearance, and a body that is just the right amount of ripe flesh, and the son-in-law has been feeling sexual desire for her for a while... As they start living together, the distance between them decreases, and he rubs his erect penis against the mother-in-law's body and conveys his erotic consciousness, the mother-in-law gradually begins to care about the son-in-law...