I was 15 and horny all of the time. I was not a jock, more of a nerd actually. One afternoon my Mom said that I should go visit at a friends house with her. The place was about a block away, so we walked. Mom and Dad had known these people since before I was born and they had two daughters. One, I'll call Sarah was three years older than me and the other I'll call Jill was a year younger. I had a big crush on Jill so I was happy to go with Mom.
My Mom and Jill's were having coffee and we went outside to talk. Jill's yard had a weeping willow tree that went down to the ground and she told me she wanted to show me the inside. Once you were inside the tree you couln't be seen from the outside.
We sat on limbs inside and she said she'd tell me a secret if I'd promise not to tell. I said 'Sure'! She told me she was in the tree with another boy and he peed and showed her his 'thing'. She said he told her that any boy that was in the tree with her would have to do it too.
I didn't like the boy she mentioned and told her that I would do better than him. I told her to close her eyes for a second. She did and I pulled off my t-shirt, shorts and underware. I said open your eyes and she looked at me and started to giggle. I asked her what was so funny. She said she was just teasing and the other boy had only showed her for a second.
Since I was already something of an exhibitionist I was starting to get an erection. Jill was grinning from ear to ear almost. I stroked my penis a couple of times and asked her if she wanted to touch it. She got close and reached out with one finger. I showed her how to hold it and stroke it. She was really excited about seeing everything, my penis and testicles.
I leaned against a branch and let her play with me. It was really the first time a girl had touched me. Oh it was feeling so good. I told her I was going to squirt soon and she quit and moved back. She said she wanted to see me do it. I started stroking for her and she was cupping her hand and pressing between her legs.
I tried to get her to show me or at least pull her pants down a little but she told me some other time and wanted to see me squirt. With her staring at me stroking my penis up and down. I was harder than I think I'd ever been. Soon I was gasping, my legs were shaking and I was humping my hips. I began moaning softly. Soon I said, 'Now' and three thick ropes of cum blasted out with more dripping from over my hand. Jill's mouth was wide open and she kept saying 'Oh my gosh, oh my gosh.' I was drained.
We stayed under the tree for about another half hour just talking and I stayed naked until my Mom called from the back door that she was going home. I quickly pulled my clothes back on, told Jill that I would see her later.
Mom asked if I had fun and I told her we talked about stuff but yeah I'd had fun!