We both get in, and she slips her shorts and panties off, and climbs on my lap. Usually she is facing out the front. Keeping guard you might say. My cock slides easily into her wet and waiting pussy. She grinds slowly and deliberately into my lap, but that is not the true focus of her interest. For the last hour or so she has been showing off her breasts to every guy along the way. The wind has been blowing across her nipples to the point where she is in serious over-stimulation mode. So while my cock is being massaged inside of her, my hands are ever so slowly working their way up inside her shirt in the direction of her breasts.
Timing here is everything. If I arrive at just the right time it is like touching a match to a canon. And the reward for good timing is a convulsive orgasm the likes you've never seen before, unless you are looking at the truck at the time. My cock has yet to reach the end of one of these explosions without going off itself. Then I just tip her back into my chest, and we sit for a little bit while we catch our breath.
Sometimes, it's a romp in the woods along the side of the path. She just drops her bike without warning and runs for the trees. By the time I catch her, the tops off, the shorts are down and she is bent over, braced against a tree, ready for action. I like to think that it matters that it's me but I am pretty sure that first cock gets the prize, and that turns me on even more.
This is her naked vixen trapped in the woods fantasy, and I know my role. I am to pin her against the tree, and drive into her from behind as hard and deep as I can, pounding her against the tree until the leaves fall. There have been mornings after this when I have awakened to her lying in bed tracing the scratches left by the tree bark, and making herself cum just from the memory of it.
So, if you're out riding on the bike path, keep your eyes open, you never know what you might see, and by the way, her bike is blue.