This is a real story. In fact, it is the personal experience of a best friend of mine. When he told me, I felt excited and evoked the most primitive desire of a man. So I felt that I should write it down, preserve it well, and slowly recall it. Since it was a best friend's experience, it was difficult to describe, so I replaced "He" with "I" and wrote it in the first person form. This is actually a little yy's thoughts. The fantasy of this can happen to me.