My wife was about to give birth, and I was soon to become a father. Around that time, my sister-in-law, Shoko, came to visit. Due to our sexless marriage, I had been building up frustration, and when I found myself alone, I started masturbating. To my surprise, Shoko caught me in the act… Although I managed to cover it up at the moment, Shoko, whose husband was on a solo business trip and was sexually frustrated, began to tease me about it. The thrill and excitement of doing it anywhere eventually swept me away as well…
