Went underground and stood behind a girl about 25 years of age, she had an nice big butt. I pressed my cock gently against her butt. She seems not to care. Did so for about 10 minutes, then came my stop so I got off. Was so horny that it was about to cum in my pants. There is a small grove of trees a little distance away, so I went over there and jerked off. I was pretty close to cum when I came in among the trees so I pulled my pants down quickly and started.