I collect my neice Ellie from her riding lessons on Saturdays. She is 13 and flirts like crazy, seeing her in her tight riding jodhpurs gives me a raging hard on, she fills them and has a stunning figure. I usually get to the stables early and read a paper, last weekend as I waited another girl about the same age was hanging about next to where I was parked, she was on her mobile and had the cutest body ever, my cock swelling looking at her thighs and bum encased in tight jodhpurs, the line of her panties cutting across her bum and the crotch sucked up between her legs. She walked off and I watched her out of the rear view mirror and then she was gone from sight so I went back to my paper. A short while later I noticed her again in my mirror, she was on her bike and heading my way. She stopped close to my car and watched her friends riding around the training enclosure. I glanced up over my paper, she was sat on her bike and holding the side of the van next to me, she could just touch the floor, looking at her cute bum in the jodhpurs spread over the saddle made me instantly hard and I had thoughts about the narrow bit of the saddle rubbing her between the legs. Then she slid off the saddle and stood astride the bike with the cross bar jammed tightly up against her crotch, my cock throbbed as I looked at her tight bum only a few feet away, her panty line cutting across each cheek, as she stood there she was gently rocking to and fro and flexing her bum and my cock throbbed as I thought of the metal tube nestling up tightly against her pussy and pressing her panties up against her cute tushy. Suddenly Ellie came skipping over and jumped in my car, the girl on the bike turned to say goodbye and I noticed her firm breasts and poky nipples sticking out, the whole way home I wondered if she was getting a thrill from straddling her crossbar!