I don’t think will come as much of a surprise to you, but when I went through puberty (around 18, late bloomer here), my horny levels went through the roof. I needed to jerk my cock multiple times during the day, and I was way too shy to find a girlfriend to do it for me/do it for her. On a couple of occasions, I was nearly caught in the act, and I decided that I needed a safe space for me to jack off without anyone around. I thought long and hard (pun unintended) of where I could go, and I decided that the woods at the top of my road would be perfect. Who was going to interrupt me there? A rabbit?
So the woods became my new jack off place; and boy, was a lot of cum unloaded there. I would stand under the same tree (an large Oak, if you were wondering), take off all my clothes and stroke my cock for hours on end until I couldn’t anymore, jizzing on the trees like it was sap coming from the bark. This became my routine every Tuesday, for about three weeks.
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On one of these Tuesdays, which was like any other with me being butt naked, I was spanking the monkey when I heard a rustling behind me. Initially, I ignored it and continued to stroke my cock. It was probably a bird or something. It wasn’t until I opened my eyes again that I saw what had made the noise.