Yes, doggy style

I move Katy further inside her van so that I can shut the door behind us. As we scuttle deeper into the car, Katy never stops stroking me. She has my pants and underwear down around my thighs. Afraid that too many words may break the spell we seem to be under I say only "Flip over" and begin to pull on Katy's ample hips to indicate what I want her to do. She begins to move, but she doesn't get in the position I was hoping for right away. I begin to fear that she's having second thoughts and realizing how ill-advised it might be for a happily married woman to have sex with a coworker in the back of a van.

In this cramped dark space I can't tell exactly what it is she is doing until I feel the underside of my rock hard cock nestle against the cool naked skin along the crack of her ass. I reach down and feel the smooth round shape of her firm backside. I move my hand up along the small of her back, up along the ripple of her ribs, until my hand is between her should blades and nestled in the waves of her hair. She appears to have gotten herself completely naked. The thought that I'm here ready to have sex with Katy, married long time coworker Katy, naked Katy makes me even harder, painfully hard. I need to be inside her now. I pull myself back a little and angle my now throbbing erection at Katy's sex. It doesn't matter that I can barely see what I'm doing I can feel the heat emanating from her vaginal lips. My aim is true, the head of my cock comes into contact something hot and surprisingly wet. She wants this. I quickly slide into Katy's silken depths until I am about halfway encased in her throbbing warmth.

Katy lets out a deep moan. "OHhaaa...!!" I savor the feel for just a second before I pull out, change my angle slightly and thrust in hard. Burying myself to the hilt. Katy's body jerks a little as I do, "Oh God!! Oh... John your cock is bigger that I realized, how have you ... ughhh .. how have you hidden this.. ohh.. thing at work?" I begin slowly sliding my length in at out of Katy as she talks.

"I didn't realize ..ungghh... you had ... unghh.... been looking." I quicken my pace as Katy starts to thrust back into me while slowly gyrating her hips.

"Ohh... Yeah...I've wanted this... I've .. unggh... wanted you ...but. I need you to pull out. We can't do it like this." You're stunned as she says this. Does she want to stop? How can she want to stop now?