Kana and her husband have been dating since college and soon progressed to marriage. Although they have never argued or had extramarital affairs, their relationship seems to be growing distant. Oki is Kana's husband's boss and always helps her husband. Today, it is raining heavily, and Kana's husband is drunk, so Oki has to take him back home. Due to the heavy rain, Oki is soaked and Kana invites him into the house to shower, dry his clothes, and wait for the rain to stop before returning. When giving a towel to Oki, he suddenly steps outside naked. Although he quickly leaves, the image of Oki's big cock is deeply imprinted in Kana's mind. Oki also notices from Kana's eyes that she is lacking in sexual satisfaction. Indeed, when Oki touches Kana's body, she resists very weakly. With the water made, Oki gradually takes over Kana's body. And from then on, Kana cannot forget the pleasure that Oki brings. Every day when her husband comes home from work, she always hopes that Oki will come with her husband so she can enjoy the sexual pleasure that her husband cannot provide...