This happened when I was swimming at my best friend's house when I was 13 years old. We had been friends since forever. Her name was Jess and she had a pool in her backyard. So one day when we were both swimming we had had enough so we went up to her room with our towels and our suits still on. We watched some TV for a while and then she said that she wanted to change out of her bikini and asked me to leave the room so I could change as well.
But instead I said I would just change in her closet and she could change in her room. Now her closet has slits in it that the person on the inside can see out but the person on the outside can't see in. So as I started to get changed I took off my suit and then I looked up and saw Jess taking her bikini bottom off. At first all I saw was her ass, but it was so fine I almost died right there.
Immediately I got a boner. She then took off her top and dropped it on the floor and then bent over giving me a full view of her shaved tight pussy. She then turned round and asked if I was done because she had to get her bra and thong out of the closet. So I said I was even though I was still completely naked. She quickly opened the closet and we both stood there together looking at each others bodies.
We then walked over to her bed and started to talk, still naked. She said that she wanted to touch my dick so I said only if I can touch your pussy. She quickly agreed and she started to jack me off. After she leaned back on the bed and I began to touch her pussy. She began to moan and moan. She quickly came and it was awesome.
After we both got dressed but just in our underwear so we could have more fun later.