Maiko, a mother who lives with her daughter and her husband who are worried about living alone. On the face of it, the relationship was good and there was nothing wrong with it, but frustration piled up and I was indulging in masturbation at night. Then, his son-in-law, Hikaru, is secretly peeking into her foolery ... Maiko, who knew that he was a big boy, couldn't control his overflowing lust and tempted him obscenely every time. The son-in-law who inflates a big cock to the repeated foolery of his mother-in-law can not stand it at last.