During the summer I went camping on holiday with a mate from college, Jon. We'd just finished breakfast one morning, Jon had gone off to the wash-block, and acting on an impulse I dived into Jon's tent and started rummaging around amongst his kit. I quickly found what I was looking for, a pair of his shorts, and by the time Jon returned I had stowed them safely in the bottom of my rucksack in my tent and I was sitting outside again, exactly where I had been when he had left.
That evening when we finally turned in it was about 11:00pm. In the privacy of my tent, I took off my sandals and shorts and slipped into Jon's shorts. My erection hardened as I did so. I slid into my sleeping bag and began to let my hands meander, while palming over my bulge and feeling around my balls and bum, enjoying the feel of myself through the soft cotton. Presently I undid the zip and took out my erection, started massaging myself slowly, fantasising about Jon all the time. I soon started to pre-come, and before long my erection was all wet and the front of his shorts was getting damp.
After a few minutes I let go my erection and laid still for a few moments and then I rolled over onto my front. Nature took over and spontaneously I started to hump against the mattress, slowly at first, but gradually getting faster and more energetic. Finally I bucked high off the mattress and orgamsed. It was exquisite. All my wank flooded into his shorts in a series of long spurts. I was fantasising about Jon orgasming and I whimpered with ecstasy and delight.
Feeling content and satisfied I soon nodded off to sleep.
I awoke sometime later in the night, perhaps about an hour or so later, with a throbbing erection again. Now I slid a hand inside his shorts, they were still wet and, with my free hand cupped under my balls, I masturbated furiously, ending with wanking up into the soft cotton for a second time.
In the morning I had a raging hardon again. Mustering all my self control, I resisted the urge to masturbate in them a third time, and instead I slipped his shorts off, changed back into my own and got up for breakfast. Later, whilst Jon went to the wash-block, I reversed the procedure of the previous morning and put them back in with his kit. I was confident that he had not missed them as such, but there was now sizeable stain in the front. Only time would tell whether he guessed what I had done...