Our family used to take long camping vacations when I was younger. We had a big station wagon and all the gear. When I was 14 or so, before I had a drivers license, I was a confirmed and compulsive masturbator, and jacked off constantly. Never sure whether my brothers did.....we never discussed that taboo subject. I recall one vacation in the Shenandoah Mountains, we camped for 3 days at the same campground.
Next to our site was another family with a daughter named Jennifer, about my age.....as cute a blonde girl as I'd ever seen. I developed one a huge crush on her, and talked to her all the time. One day I noticed laundry hanging behind their camper, which included a few pair of Jennifer's underpants. I was quite turned on my these. That night I stole over to their area and grabbed a pair, rearranging the rest so it might not be noticed (I never knew?). I sneaked off into the woods with a flashlight, with a raging hardon under my jeans. When I reached a nice secluded place, I sat down on a rock and closely examined the panties - which still had that brownish, tell-tale slit-shaped stain in the crotch, even tho they'd been washed. Got, I was hot - just thinking of her cunt being right against the cotton fabric just days before.
I put them on fantasizing that I was her. Then pulled them down to my knees, simulating that it was me pulling down her panties. I jacked off as I pulled them off and put them over my face. As I was about to shoot, I spread her panty crotch out face up on the rock, and ejaculated my semen into Jennifer's underpant crotch right on top of where her cunt had been just days before....fantasizing that it was her hand masturbating me into her own panties. Damn...what a hot, hot fantasy, and one was to be repeated many times on that camping trip. And every day on that vacation, as we drove along, I would fantasize about Jennifer & I having every conceivable kind of sex in the woods, and couldn't wait to get to the next campground to steal off into the woods for another adolescent jack off session. I was starting to fear that I might exhaust my supply of sperm. I loved wearing her panties while I masturbated.
I kept her panties for years, and they eventually became yellow and crusty with dozens and dozens of my cumloads deposited in them. I kept them hidden behind a loose baseboard in my closet at home. Jennifer never knew how much pleasure she gave me that summer.