Nanami, who has been married to an older husband she met at work for a year, is frustrated by her inability to conceive. This pressure seems to have affected her husband as well, making him less able to get an erection recently. One night, Nanami noticed that her husband's penis was erect while touching him upon his return home. Seizing the opportunity, she immediately gave him head. However, it was not her husband but her husband's subordinate, Kinoshita, who blurted out 'I'm coming!' Since then, Kinoshita has been taking advantage of her husband's absences to approach Nanami... Meanwhile, Nanami can't forget the taste of the penis she gave head to that time, and the two have become engrossed in an affair.
