I was on my way to visit a friend, four hours away from me during college break, and I was really horny and had a raging hard on for about an hour. I was on a state highway and there was a rest area that had no cars at it so I decided to stop for a good jack-off session.
There were only two stalls in the rest area and neither had doors; it was a very primative rest area. I went into the second one and started pumping away. It felt really good and I started moaning and stroking faster and faster. As I got to the point of no return and moaning louder, the door opened and another guy came into the restroom, he came over to mine but saw me in there and then went to the other one. I shot my cum really hard and it made the splashing sound in the toilet. I think he heard it because I heard him finisih his pissing and he was still there. A few seconds later, I heard the familiar slapping sound.
As I cleaned up and left, I saw him standing there taking care of his business as well.