Saturday night me and two buddys were driving around in his truck, on the way home we picked up a stranger thumbing a ride. I was the smallest so he sat by the door and I sat on his lap. He needed a ride about 10 miles, and almost as soon as we got going I felt something getting hard under me. I knew he was getting a hard on, and it was embarrassing, but at the same time I kinda liked the feeling, and it was dark in the truck. So I very slowly started moving my hips back and forth and slightly twisting around on him. Then he said pull in that driveway on the left, I live there, I got out to let him out, he thanked us for the lift, and before I got back in he said, you've got to come over and we can finish this.