Miho lives with her husband's parents. When her father-in-law, who had been hospitalized, comes home, she is a devilish wife who seduces him by showing off her panties. She was found by her father-in-law while changing into sexy underwear before going to her part-time job early in the morning. He gets jealous and thinks she must be cheating on him with a man from her part-time job, so she retorts, "It's because your son doesn't satisfy our sex life at night," and asks, "Father-in-law, will you take responsibility for that?" Her father-in-law is enraged and hugs Miho, making her take his penis, which is too hard despite its age, deep in his mouth and cover her in saliva. Even though he worries that he will touch her body, her father-in-law's excitement does not subside, and Miho's excitement also increases, and the wife and father-in-law have sex in the kitchen and living room early in the morning after everyone is asleep.