For my 16th birthday, along with my drivers license, I got a Porsche Boxster. My mom and dad surprised me with it in the driveway the morning of my birthday.
It wasn't much of a Boxster, it was almost older than I was, but the previous owners had taken good care of it, and for a 16 year old guy, it was a dream come true.
About a week later I was in the driveway washing it, wearing just a pair of swim trunks and my flip flops... and being a teenaged guy, I was kinda hard, thinking about sex. By the time I turned off the hose, I'd half way decided to go into my room and rub one off.
Then it hit me... I was turned on by the car. I know, kinda kinky, but at that age I was turned on by everything. The smooth red paint, the sexy curves, the great engine... and thinking about using it to take a girl out to the lake and mess around with her, all of that was contributing to my hard on.
I was alone at home, so I figured 'what the hell.' In a flash I had my beauty in the garage and as soon as the garage door was safely closed I slipped out of my swim trunks and gave myself a couple of quick pumps to get a little harder. I lay down on the driver's side rear fender with my hands underneath me, along each side of my massive hard on. The sun warmed metal felt great on my balls and the underside of my cock, but it wasn't very comfortable... not very soft at all.
I stood back up and made a little pillow out of the towels and a chamois that I'd been drying the Boxster with and positioned it on the fender. I lay down as before, with my shaft and balls on the chamois, and just the tip of my cock on the warm metal of the fender. With my hands on each side of my cock I started to hump. The cool damp chamois, the warm fender and the friction from my hands felt great.
It only took about six strokes and I was blowing buckets on the fender. Just as the waves started to subside, I heard a car in the drive and the garage door started to open. No time to clean anything up, I grabbed my shorts and the chamois and ran like hell through the back door, my cock still twitching. I ran out into the back yard, where I dove into the pool.
That's where mom found me about two minutes later, and she chewed my ass for skinny dipping. She told me to get back into my pants before my sister and her friends got home. I was okay with that... better that she catch me skinny dipping than humping a car, lol.
Frankly, it wasn't that great, and I never did my car again. Not that comfortable. But, making that car truly mine (lol) was cool.
And... about two weeks later when I talked Jenny out of her bikini up at the lake, I perched her on that special fender before I slid it home. I like to think that the Porsche smiled when Jenny started to moan.