I was in the car with 2 of my friends [M20 and M19] on a road trip back home a few months ago. I was in the back while they were both up front. I was scrolling through NSFW Reddit channels because the thrill of risk made it even better and more arousing. I had my hand over my cock, pushing against it a little cause I was wearing sweatpants. The idea was only to rile myself up and get to the edge and then cum when we stopped for gas.

Around 20 minutes before the next gas station (while we were in the middle of nowhere), my friend went over the rumble strip on the side of the road. It was so unexpected and sudden. The vibration of the road, mixed with the pressure of my hand, plus the fact that I'd been scrolling through Reddit for more than an hour at that point, pushed me over the edge, and I came in my pants. I tried to resist but I couldn't hold back, I genuinely couldn't help myself. Then I had to sit there in my own cum until we got to the gas station, scared the whole time that it was going to show through my pants. Luckily, there was only one spot that soaked through, and it was easy to hide with my hoody.

I wont lie, it was thrilling. I've never done anything even remotely like that before, but it was one of the best orgasms I've ever had. And then the fear of getting caught or them seeing it soak through my pants and the humiliation of being forced to sit in it until we pulled over added even more to the fun of it.