When I was 14 and still in scouts, I was the den chief for one of the Cub Scout groups. When they had meetings, I had a couple of the Cubs that I would get off to the side and tickle the daylights out of them-grabbing their sides and ribs and quickly moving my hands under their shirts.
I didn't think anybody know about this little 'activity' of mine, and was about to get the surprise of my life when we took the Cub pack on a day trip to the scout camp. When it came time for afternoon activities, they were to go to the various locations (lake, archery, etc.) and spend about two hours there.
As everyone was leaving, two of the older Explorer Scouts called me over to one of the tents and ordered me to lie down on the bunk. Not knowing what was up, and them being older, I quickly obeyed their instructions. In short order, they tied my hands over my head and my feet to the bottom rail, and then proceeded to unbutton my shirt-it was summer, and I had on the scout shorts and no undershirt.
After they left, who should come into the tent but the two boys I had tickled all of those times. I'm sure I knew what they were going to do, and my fears were realized as they started tickling my exposed and stretched out ribs and stomach-I howled louder than I think they did when I tickled them, and that just encouraged them even more.
After about fifteen minutes of tickle torture, one of them pointed to my shorts and started laughing-I had no idea of the effect tickling would have on me, but I was sporting a huge erection. 'Okay, okay, let me go now', I said, but it was obvious they had no intention of untying me-there was still an hour and a half until the activity time was over.
Slowly and methodically, they unbuckled my shorts and slowly pulled down the zipper. Once the zipper was pulled all the way down, they spread my shorts open and exposed my white briefs with my raging hard-on. Four hands and twenty fingers lightly tickled and played with my cock, balls, and thighs as I continued to laugh uncontrollably. Finally, their hands played with me long enough, and I erupted in my briefs.
They continued to tickle and feel my chest and my stomach for about fifteen minutes afterwards before finally untying me-I was so exhausted that I did not even move.
Even with their revenge on me, I know that I would be back to tickling them as soon as I could.