In my father's car

Hi, this one happened when I just got my drivers license, and I borrowed my fathers car for a test drive with my girlfriend...
We went to a music festival, and had a good time there although I could't drink alcohol. On the way back, my girlfriend was all over me, touching my cock trough my pants, and kissing me in the neck. So I found a recluse place to park the car, and started fondling her in return. Soon, we were both naked, and I tried to penetrate her in the front seat. Because of a lack of space, I ended up against the windscreen, with my erect cock far from her eager pussy... We climbed in the back seats, where was a little more room, and I managed to make love to her doggy style. After a few minutes she started moaning quite loud, and had a very satisfying orgasm. Soon after, I felt that I was coming too, but she shouted that I had to pull out because she didn't use the pill. When I pulled out, I spilled all my cum on the upholstery of the car, I couldn't explain to my dad how that stain got there...