This happened a few weeks ago.
My girlfriend and I had been shopping in the mall and had a decently long drive home ahead of us. We were fairly aroused having been with each other all day and I told her I needed a way to release my sexual urges. She had a good idea.
My girlfriend is 5'3', nice legs, 36B breasts. Let me say she has the nicest tits I've ever seen on a girl. They are very firm and have nice nipples. I just love sucking on her nipples. Her pussy is to die for too.
So, she decided to rub my cock over my jeans, making it the full seven and a half inches. She took my cock out, looked at me, smiled and began to jack my cock up and down. She stroked my cock up and down slow then fast, helping me build up. Not to get her arm tired I told her I would take over. She didn't sit back and watch, she proceeded to take her nice tits out and caress her breasts and rub her clit. I began stroking and eventually came hard on my stomach. We had napkins just in case.
Just something about being in a car is a turn on. Well, time for me to stroke my cock.