Miki lives with her daughter and son-in-law. Their relationship is good, but the lack of sexual contact with her husband is what's making her more and more frustrated. While spending her days in frustration, she accidentally catches a glimpse of her son-in-law, Shinichi's, big cock... Captivated by his manly beauty, she can't control her rising urges and milks him wherever she goes. Shinichi, who is sexless with his wife, can't help but devour his mother-in-law's lustful temptations around the clock...