This happened when I was fourteen. I went swimming with my brother and two other boys from our neighborhood. They were from 13 to 15-years-old. There was no changing room and I went behind some trees to change. The boys got changed close to the riverside.
When I had changed I went back to the boys and they were already in the water. We then got into the water. We bathed for a while and had fun. It was especially one of the boys, the oldest one that I liked. I do not want to write his name, because he could then read this. He was well developed and big for his age. He was also very easy to be with and we had a great time together.
After a while we decided to get out of the water and I got back to change. Before I got changed I went to pee, and got into the bushes near the river. From there I could see the boys. They were now getting all naked. I could clearly see that the oldest boy had a much bigger penis than the other. I got a little embarrassed, but I could not help to look at him. I waited a while and then sneaked back to get changed. Then we all cycled home.
The next day me and the oldest boy were the only one's that were going swimming. When we came to the water I decided not to go behind the trees to change, but to change there next to him. He had just a small towel to change behind, so he turned the other way. When we had changed, we dived in. We had fun in the water. At that time I like to fight for fun, and so we did. Once I got close to his pants, and he said to me to be careful. At one time I thought I could feel his hand on my bottom, but I was not sure if it was intentional.
After a while we got up to dry and we lay next to each other on the beach. I soon realised that he was getting a hard on from lying there, and suddenly he turned onto his stomach. I asked him why he did that, but he didn't reply. I then asked him for fun if it was because he was horny, but still he didn't reply.
We decided to go home and got our bicycles. On the way home it started to rain, and it was a really heavy rain. Our clothes got all wet in an instance and we decided to seek shelter in an old barn by the road. I took my t-shirt and skirt off since they were all wet, and he took his t-shirt and shorts off. It was the natural thing to do since we had just been bathing in our swim suits together. He stood there in his underwear and I thought he was beautiful. I went over to him and took his hand. Then I kissed him and pressed my body against his. He kissed me back. I could feel that he got hard and I took one step back. Without a word I pressed myself against him again, kissed him and took out his penis. I took my hand back and forth, and I felt that his breathing got heavier and heavier. After a while he came and his semen went into the hay and the wall in front of him. I thought it was very erotic, and was turned on myself, but he didn't know what to do. In a way that was good, because I'm not sure that I would have liked him to touch me.
Now the rain had stopped and we cycled back home. This was my first sexual experience with a boy.