Down by the River
I was 15 and I was going out with a girl who was the same age. We were walking down by the river. We were constantly stopping for a kiss but one time we stopped it went a bit further.
We stopped for a kiss by this big tree. In the middle of the kiss she put her hand on my crotch. This excited me greatly. She then grabbed my hand and put inside her panties. I could feel her getting wetter and wetter. I then grabbed her small teenage tits with the other hand and carressed them for a while.
My fingers went deeper and deeper. Then I began to carress her clit. She groaned with pleasure as she came to orgasm. She then grabbed me and undid my jeans. She took out my penis and began to stroke it. By this time I was incredibly horney and it wasn't very long before I shot loads of cum all over her still wet pussy lips.
That was my first real mutual masturbation experience. It makes me horny everytime I think about it.