This was one of the most exciting sexual experiences I'd ever had.
Our parents had planned a large party for a weekend at the summer house of friends. They took their kids along, we were left mostly to ourselves, and so it was that after dark four of us boys were sitting together on an upstairs porch where we began to talk about masturbation and all of us got big hards on. The boldest of us dared the others to show the group his hard dick. Naturally the other three insisted that he go first. He did, and pulled out a nice hard about 4 or 5 inches long. Then he waited for the other 3 to show theirs.
Finally all four rock hard peckers were out for inspection, and we began to feel them and comment on the length and thickness. That got us even more horny, so we all began to stroke our straining dicks without intending to go all the way to comimg which we felt inhibited from doing with the others watching. Suddenly with embarrassnent the leader jumped up, went to a corner and with his back to us, and shot a load of adolescent come on the floor. The sight of his orgasm, the sound of his gasping and rapid fire stroking soon had the other three coming as well. This left four come puddles on the floor, and the group now relaxed without inhibitions. After a rest of about 15 minutes we all did it again.