When I was about 15 I went on a school trip to Normandy in France, staying in a hostel with five or six other boys. I knew a few of them from a while back but the others I had never really spoken to, but that was about to change.
During the course of the trip I got close to Matt, who was taller and broader than me, talking late into the night. One night whilst we were waiting for the teachers to go to bed before running riot we were both lying next to each other in sleeping bags, covering our bodies. Not surprisingly I was horny, and having Matt so close to me was weirdly attractive, and I got hard. Under the sleeping bags I fiddled a little and I think Matt did too, but that was it. I knew there was something between us and when we got back home I was keen to explore it.
Half a year later I had him round for a sleepover, where we did all the usual but then started getting ready for bed. I was changing and he looked away, so I assumed I was 'safe' but then I felt a tug on my briefs and they came halfway down. Although this had been a childish playful act I knew it might lead to more. After we bedded down I asked if he wanted to watch porn, and he said he definitely did. We both lay there close to each other getting hard, and I could see his bulge growing next to me. He was uber horny and started jerking off, and then I reached over and felt his hard cock through his underwear. I reached down and bought out the warm monster, and began stroking it. He let out gasps of pleasure and said 'I'm pulsing' before quickly reaching over to my now exposed cock and returning the favour. I was in ecstacy but knew how these things could be all too quick, so told him to slow down so we could enjoy it. After more of this he eventually said he needed to cum, but not before laying down a few hard strokes to my dick which sent ropes flying to my face and his arm. 'Oh Tom!' he said, which sounds corny thinking about it now. Satisfied I could see he was itching to cum and leaned over and gave my best tugs before he let out a considerably smaller but just as passionate load onto his chest.
After we promised to keep it secret but have done more since. Great experience-everyone do it!