Yurine, who lost her husband at a young age, lived with her daughter and son-in-law. Her daughter's husband, Junki, got along well with her, and they led a plain but happy life. One day, Yurine witnessed her daughter and Junki arguing about sex. It seemed that her daughter was not good at sex and kept refusing Junki when he approached her. Concerned, Yurine tried to talk to her daughter, but her daughter wouldn't listen. Then, by chance, Yurine caught Junki masturbating. Shocked and flustered, Yurine took an unexpected action. 'My daughter's responsibility is also my responsibility as her mother...' so Yurine grabbed Junki's dick. It started with just handjob but soon turned into fellatio… then full-blown sex… Yurine desperately tried to resist the unstoppable Junki…
