I ride my bike on a trail very often during the week. I have found that it is a fun place to masturbate. First, there are not many people around to see me. Second, there are some people around that might see me. One beautiful day, I went just off the trail behind a bush and took off my shirt. I pulled my shorts down to my ankles along with my boxers. The sun was on my mostly naked body and the grass was a comfortable bed for me. The wind blew across my sweaty chest and cooled me down.
I closed my eyes and pictured what me and my girlfriend did just a few days earlier. We had pretty wild sex at her apartment on the balcony. My dick got nice and hard thinking about it. I grabbed it and jerked it up and down. I was prepared not to stop masturbating even if someone were to walk by. If they came that close they would have seen me. That thought turned me on more. It wasn't long before I shot my load onto my chest. I didn't concern myself with that; I was concentrating on the feeling of semen coursing through my penis and the feel of 'orgasm' throughout my body. It makes my toes curl up, my face grimaces; I even let out small moans. I love that feeling.
I kept stroking until nothing was left inside me. I had nothing to wipe myself off, so I left my semen on my chest. I rode the rest of the way home with a mix of semen and sweat all over me. I passed a few people but they had no clue.