I went to Uni later than most and while there, I met a young girl called Jo who was on my course. She was lively, and a lot of fun. As part of our course involved PE, I got to see her in her very loose fitting t shirt. Jo was one of those girls who didn't need to wear a bra and seeing her breasts was commonplace actually, they looked little more than bee stings with tapering nipples. One day, I couldn't stand it any more and left the class for the communal changing room. I just had to jack off.
I didn't even have the presence of mind to try to find Jo's clothes and the trousers she had worn to class. I just had to get off.
I was really getting into it and about to cum when I heard 'Do it here'. There was Jo who had clearly followed me out of class and had been watching. She sat on the bench and lifted her gym skirt. Underneath were a pair of dark green panties. I shot a large load all over those panties and was rewarded by being made to watch Jo as she masturbated.
Underneath those panties was a perfectly smooth pussy with a tiny little clit bar in.
Over the next few months I got to have a little more fun with her. We never went all the way, but we did experience a few really kinky moments together.
Maybe I can get Jo to tell you more.