One day, while my wife was at home preparing for the birth of her child, my sister-in-law Saya came over, thinking that I might be in trouble. I was taking a leisurely bath, taking advantage of her kindness as she helped me with the cooking, laundry, and other personal needs... when Saya barged in completely naked. She even said she would take care of my lower body. In fact, things weren't going well with her husband, and she had come to relieve her sexual frustration. But her real target was my dick...