Riho and her husband have been married for a year and live with their father-in-law. Riho's libido was so high that her husband had to suggest that the two would abstain from sex together for three weeks. Riho didn't want to, but her husband said he just insisted and said that having sex after that time would be extremely happy, so Riho had to accept. But it was only a few days before Riho's bottom felt extremely uncomfortable. She invited her husband but was refused. She really couldn't take it any longer, when her father-in-law was taking a bath, she put on a small towel and went inside, she asked for permission to rub his back so that she could play with his gradually erect boy. She slowly took off the towel and pressed her big breasts close to his back, using it to scrub him. Riho felt extremely excited when he did this with his father-in-law who still lived with her. And then the forbidden relationship between the father-in-law and the bride began, they always clung to each other, exchanging naked desires even when Riho's husband found out...