When I was about 14, my female cousin came to live with us. She was a year older than me. Innocently, it all began when I came into her room one night and we both said simultaneously, 'I'll show you mine if you show me yours.' That was the beginning of our masturbation relationship. We started by just looking, and then I would go back to my room and masturbate. She would masturbate in her room, although we never revealed that that was what we were doing. The old house where we lived had a large storage closet behind our bathroom. I made a peep hole that we could use to watch each other. She knew I would watch her in the bathroom, and I knew she would watch me. Quite often I would masturbate in the bathroom knowing that I was being watched, and she would do the same. Only about a year later did we get the nerve to start masturbating each other. I would rub her pussy until she came, or I would hump her (with underwear on) until I came. Sometimes we would rub each other at the same time and try to come together. We did everything that one could do to have an orgasm short of actual intercourse, which never happened. There was a lot of cum squirted on her stomach and breasts, and lots of cum and pussy juices rubbed all over my face and chest. This little routine went on until a month or so after she became engaged. After she was married, we didn't she much of each other, and we never talked about our little secret sessions, until forty years later. She had lost her husband, and I would still fantasize about her while masturbating myself.
We found ourselves in a situation one day where we began talking about old times, and both were surprised to find out that each of us still had the desire to do it all over again. I however was still happily married, and did not do it again, but we still call each other on a regular basis and talk about masturbation, and how thinking about those days back when we were 14 and 15 still give us the best orgasms when we each masturbate now.