Yumiko had been living with her daughter since her husband passed away. After that, her married daughter and son-in-law started living with Yumiko. One day, when Yumiko came home, she found her daughter and son-in-law having sex. Yumiko tried not to notice, but she wets herself in the entranceway. Her kind son-in-law cleaned up after her. That night, her son-in-law said that his wife doesn't do it often. Yumiko said that she would be happy if he asked her, so she kissed him and made love to him. After that, the two continued to seek each other...