Nici,
Its amazing to read your response, I remember doing the same thing when I was that age and I was about 9 when I found out. Then around 11, I had a neighbor of mine that was a girl around 13, and she asked me about it one day in her backyard, and went to her clothesline and proceeded to show me and another girlfriend of hers, of course I was too embarrassed to admit it, I just shrugged it off, but had been doing it for over 2 years at that point. I stood there and watched in amazement as she felt exactly what you described. Only other person i ever saw doing it. But I too used to do the same as you, would go to somewhere usually after dark, be it the school playground or the park, and strip my clothes and hide them in the edge of the woods, then go to the monkey bars next to the woods and climb it naked. To this day it was always the most intense orgasms I have ever had. The cool night air, where I could see all around, and was totally naked, and then like you said, hanging there, pulling up and and exhausting yourself to the point of orgasm, it would last it seemed forever. There are those of us that have discovered what being risque and enjoying what everyone else would think as odd, and getting away with it. I would love to come walking down the trail while your up the tree, once I saw what you were doing, I can guarantee you i would be joining you on a nearby sapling...lol. Boy, now that would really be a site for someone else to see, two adults up to trees totally naked..ha ha ha.
Kevin