Back in the 70's and 80's, there were these x-rated drive-ins. They would show adult movies and beam high-powered lights toward the road so people couldn't see in.
Usually, I went with my friends and we'd get horny, but we would wait until we got home to relieve ourselves.
One hot summer night, I decided to go to one myself after telling my parents I was going to the community college library.
The place was never packed, but had good crowds. It was good because then people could park away from others. I reclined my seat and sat back to enjoy the movie. Pretty soon, I was reaching into my shirt occasionally to pinch my nipples. My dick was getting very hard, but I felt like it was too public here to do anything about it. Finally, I decided I needed to and unfastened my belt.
One thing led to another and I got bolder and took off my shirt, then my pants, and before long, I was entirely nude. I started to get into playing with myself so much that I started to forget what was going on around me.
I edged as often as I could and tried to keep from cumming, but soon it was too much. I whacked and hammered faster and faster and pinched my nipples harder and harder until finally, I exploded hot cum all over my torso and chest and hand.
I slowed down and had a couple post-cum shudders and was starting to bask in the afterglow.
Then a voice whispered, "That was excellent." I just about jumped out of my sticky skin and looked over to see a cute brunette in hip-hugging pants and a halter-top.
I was so embarrassed but excited that my cock was already starting to grow a bit. I struggled to say, "How much did you see?"
"Quite a bit," she said. "Sorry I snuck up on you but my husband wanted to know if you were doing what he thought you were doing. It was really hot watching you."
I looked over at a van a few spots from me and a guy looking out the window waved.
She thanked me, blew me a kiss and went back to the van. They soon disappeared into the back of the van and I whacked again, fierce and furious, just hoping someone else would come watch, but nobody did.