Rin and her husband hadn't had sex in nearly half a year. Even when Rin initiated, her husband would always decline due to work or fatigue. Frustrated, Rin would masturbate alone in the kitchen. One afternoon, while cleaning the air conditioner, Rin lost her balance and fell. The son who returned from college tends to Rin. The son, remembering Rin's lewd state that he had peeked at the night before, pounced on her. This became the start of Rin and her son's relationship. The son is excited by the sex acts they do nearby without his father finding out, and Rin also becomes absorbed in the sex acts as she is demanded…
