On a midsummer day in the middle of summer, when the record-breaking heat continued, I hurt my right shoulder during the volleyball club's practice, and I decided to get a massage from my friend's mother, Mariko. From the day I first met her, I had a faint crush on Mariko, who had adult sex appeal, that I couldn't fulfill. I received a massage with such a thought in my heart, but when Mariko straddled me, I got an erection. As if she saw through my desires, Mariko approached me with a bewitching smile.