Nanami, who married her older workplace senior a year ago, has been trying to conceive but growing increasingly frustrated by the lack of results. Lately, her stress seems to have affected her husband as well—he's been struggling to maintain an erection. One night, upon hearing her husband return home, Nanami touches his body and is surprised to find his cock already hard. Seizing the opportunity, she immediately begins giving him a blowjob. But it isn't her husband who cries out "I'm coming!"—it's Kinoshita, his subordinate. After that night, Kinoshita starts visiting Nanami whenever her husband is away, slowly building intimacy with her. Nanami, unable to forget the taste of that cock during the blowjob, finds herself drawn deeper into the affair. Crossing the line into infidelity, the two grow increasingly obsessed with each other.