Married woman Shizuka struggles with a sexless marriage and confides in her childhood friend. She admits she hasn't had sex with her husband in six months, and her friend, overwhelmed by pent-up desire, seizes the opportunity, promising to help her with masturbation while secretly lusting after Shizuka's beautiful ass and slender body. Initially hesitant and worried, "Isn't this cheating?", Shizuka eventually gives in, telling herself, "Just a little." But as pleasure takes over, she crosses the line with her childhood friend, culminating in creampie sex. What began as a simple discussion about marital issues spirals into surrendering to lust, exposing the hidden desires of a married woman.