The first time I ever had an orgasm, like really climaxed, was when I was 16.
It was in the summer and I was visiting a friend. We had gone over to one of her neighbor's to have a swim. After we came back we went to her room to get changed. My friend had peeled off her bathing suit and to my surprise did not get dressed right away but walked around nude. I took my bathing suit off as well but wrapped a towel around my waist.
At the time I wore my hair very long and I started to brush it out as it was very tangled. My friend sat me down on the end of the bed facing a mirror and while kneeling behind me, started to brush my hair.
I watched her in the mirror and was unable to take my eyes off her body. She had perfect breasts. (as most 16 year olds do) They were larger than mine and I could feel them press against my back.
I began to feel that horny feeling between my legs and was embarrassed to see that my nipples were protruding.
My friend went from brushing my hair to rubbing my shoulders to caressing my nipples. She gently pulled me back towards her so that I lay flat on my back with my knees hanging off the end of the bed.
Pulling the towel away, exposing my sex to another person for the first time, she crouched over me and put her hand between my legs. I could not believe the experience. The pleasure was amazing.
As she rubbed my clit and labia I could see her vulva directly over my face. As she got more and more excited, her lips opened and I could see into the opening of her vagina. I wanted to lift my head up and taste what I could smell but it was as if an invisible hand was holding me back.
Suddenly it happened. I came.
I had masturbated before and had felt pleasure but nothing like this. This was something different, better, more powerful.
Afterwards, she and I lay together on the bed, touching ourselves and each other. I could not get her to come as I had with her but I enjoyed watching her masturbate.
We remained friends, and sometime lovers for several years.