Miyu, the mother-in-law, is a natural and laid-back person, and her husband calls her stupid almost every day. However, Miyu has huge breasts, and her son-in-law, Nobu, is secretly curious about them. Under the pretext of reconciling with her husband, Nobu approaches Miyu and says, "It would be a waste not to use these naughty breasts," and starts to play with her big breasts. Unaware of Nobu's intentions, Miyu is made to cum many times, and before she knows it, she is immersed in an affair with her son-in-law, leaving her husband and daughter behind...