Shinya hasn't had sex with her girlfriend Yui for a long time. After many beggings and solicitations, she finally agreed to allow him to have sex the following week. Finally, after a long wait, that day has come! He rushes into Yui's house and sees that she seems to be fast asleep, can't stand it anymore, Shinya fucks her immediately! But when he saw the face of the person he was fucking clearly, he was on fire, it wasn't his girlfriend! When Yui returns, Shinya finds out that it is her girlfriend's mother, Rio. Rio happened to go to his daughter's house to play and didn't expect to be fucked like that by his daughter's boyfriend. Not only did she not get angry, but she also felt stimulated and happy. The wife against the two is always at odds, so she has not been satisfied with her sexual pleasure for a long time. Shinya has a big, healthy and very healthy potato that makes Rio constantly orgasm that her husband couldn't give her before. From then on, taking advantage of this, Rio constantly forced Shinya to have sex with her, satisfying her sexuality and Shinya herself couldn't resist the charming plump body of the person who could be her future mother-in-law...