My father remarried and my mother-in-law Mizuna came to the Wakatsuki family. Only time passed without her son knowing how to treat her devotedly doing housework because she wanted to get along with her son as soon as possible. One day, because of her father who spends a busy day at her job, Mizuna has her sexual desire and she is bathed in hot water in the bathroom alone and masturbates. And she forgets the time and her son happens to peek when she is fascinated by her rich body.
