The daughter, worried about Miki, who lost her husband and was left alone, decided to live with her as a couple. Although they got used to living together and were spending time happily as three people, it was awkward when the daughter and son-in-law were making out in front of her. When Miki quietly left, they started their sexual activity. Miki watched it and became aroused, and was comforting herself. One day, the daughter went out shopping and Miki was left alone with her son-in-law. Miki, who wanted stimulation, did housework without underwear and got excited. But she couldn't stand the thrill alone...