"...Maybe I should wash your back for once." Ruisa was shocked and flustered by the unexpected offer from her father-in-law, who usually has a hobby of computers and exudes intelligence and gentlemanliness. They may not be related by blood, but they are still father and daughter. Without time to accept her father-in-law's one-sided reasoning, Ruisa was cornered at the edge of the bathtub. And the moment her father-in-law, with his calm expression and words, gently crept closer and his fingertips touched the young wife's healthy, wet skin, her peaceful married life came crashing down. The worst tragedy of her life, which occurred while her husband was away, would soon turn into an indecent daily life along with an unprecedented orgasm of pleasure...