I ride my bike often to a fairly secluded beach on peconic bay. I like to take a break at the beach, lay out a towel, sit, expose as much of myself to the sun as possible. Unfortunately this isn't too much, as this is a regular beach, not a nude beach.
So I arrive at the beach, set my towel down. There are about ten people around in a 100yard section of the beach, women, couples.
I like to change from my biking shorts to a pair of swimming shorts. I do that right on the beach by sitting on the towel and covering my waist with it as I pull off my bike shorts and then slide on my swimming shorts. I've never been bold enough to 'accidentally' let myself get exposed. But I think about it and get a chubby.
I lie down and close my eyes and I hear a group of people coming onto the beach, a man and three women. I watch inconspicuously, hoping that the women will go topless (which is not uncommon on this section of beach).
To my delight two of the three women, after setting up their beach blanket, proceed to remove their shirts, then remove their bikini tops. One is a blonde with fairly large breasts, possibly fake, but at least they are nicely shaped, and hanging, not artificially popping,( I hate fake looking boobs).
I take quick furtive glances, feeling my prostate fill up with excitement. I decide to go for a swim, because then I can more easily watch them, without it being obvious that I'm doing that. As I'm swimming, I pull down my shorts, and start to rub myself. This has never worked well for me, the water seems to not be lubricated enough, so I couldn't really go very far.
As I'm swimming, the blonde gets up and walks to the water, and I'm just staring straight at the light and shadow caused by the sun reflecting off of her curves, a delight.
Keeping this a true story: She ended up going back to her blanket, I got out of the water, rested for another half an hour, stealing glances whenever possible. Packed up my things and left to the trail where I left my bike.
I walked down a side trail, that isn't used very often, and took off my bathing suit. Then sat on a log, pulled out my oil, poured it all over my penis and started to rub, slowly, gently, squeezing, thinking about the blonde, imagining that she walks up on me and catches me masturbating, still topless. She looks shocked but interested.
The pressure in my prostate grows and grows, and I let the cum push out, without clenching, it just starts to pour and flow. The orgasm flows for several seconds, I squeeze a few more times then come back to reality.
I'm a little more sandy than I'd like. I use my towel to knock it off. The sun is hot and I worry about someone actually coming up and seeing me. I put on my bike shorts and get on my bike and ride away back home.