Miyu, the mother-in-law, has a natural and easygoing personality, and her husband often dismisses her as dull. However, Miyu has huge breasts, and her son-in-law Nobu was secretly very interested in her cleavage. Nobu approaches Miyu with the excuse of reconciling the couple, saying, "Such lewd breasts, it's a waste not to use them," and begins to play with her huge breasts. Miyu, unaware of Nobu's intentions, is cummed on many times, and before she knows it, she is indulging in an affair with her son-in-law, leaving her husband and daughter behind...