Then we heard voices just outside the van and Cassidy's eyes shot wide open. She tried to pull her tank top back down over both her big, pale breasts and my hands, but I just kept slowly working my excited cock in and out of Cassidy's tight pussy walls. The voices seemed to get a little closer, and Cassidy's eyes wet a little wider, now turning towards the closed van door. I got a devilish idea and slipped one hand back down her body to probe for the top of her slit between her legs. When I found her wet pussy lips, I quickly located her sensitive little clit and started rubbing gently against that little wet nub. Cassidy bit her lip in earnest and then turned back to look at me and mouthed the words, "You fucker!"