A father-in-law falls in love with his son's wife, Kasumi, whom he should never be interested in. Kasumi has a lovely, gentle smile and, above all, an erotic body. Even though he knows it's wrong, he can't help but fantasize about his son's wife's lewd appearance. His wife masturbates in a showy manner, and she gives him a gentle blowjob in the bath, and the father-in-law's fantasies grow and grow...