Back when I was about fifteen I learned about masturbation. I had been doing it for about two months when I thought it would be fun to do it outside where I could be caught.
One day I was feeling super horny (as teenagers always are) and decided this would be the day to do it outside. There is a big park in my town (my town has about 2000 people in it) and this park has three picnic places, each one is under a roof and has about ten picnic tables in it. I went to the empty one and started to touch myself to get hard. A woman in her 30's sat down on a picnic table in front of me facing away. She had an amazing firm round ass.
I took my cock out of my sweatpants (I wore those so I could take it out and put it back really fast) I started to jack off silently thinking of her, I came on the ground in an outrageous orgasm, I must have shot about three feet (while she was still facing away from me)just as I put my cock away she turned around and winked at me, then left...that turned me on so much that she knew and I didn't so I jacked off again after she left.
It was the most amazing masturbation experience I've ever had in public.
Happy Jacking, John