My wife was about to give birth, and I was about to become a father, so my sister-in-law, Shoko, came to visit. I was frustrated by the lack of sex, so I took advantage of the opportunity to masturbate when I was alone, and Shoko found me... I managed to get away from it for the time being, but her husband was working away from home, and she was sexually frustrated, so she used it as an excuse to play with me. Before I knew it, I was swept away by the thrill and excitement that came from anywhere...