"...Let me wash your back for once." Risa is shocked and flustered by her normally intellectual and gentlemanly father-in-law's unexpected words. He insists they're family, even without blood ties. Before she can process his reasoning, Risa finds herself cornered against the edge of the bathtub. The moment his gentle fingertips touch her young, wet skin, her peaceful married life shatters instantly. The greatest shock of her life, arriving during her husband's absence, gradually transforms into illicit pleasure...