"Keep rubbing me there." she said.

I obeyed and worked the head of my cock back to her anus and pressed against her. I began to slide myself up and down her crack, but didn't allow my dick to leave her anus. In her new position, however, it was less easy for me to rub up and down along her crack. To my surprise, she began to moan softly as I stroked her anus with my dick.

"Will you push in a little more?" she asked.

My head began to spin a little bit as I thought about what I was doing. But I obliged her and instead of sliding...