"Hurry up," Mom whispered, her voice catching as I pressed the tips of my thumbs against the bottom of her ass cheeks. I followed the line of her hamstrings from the outside in, all the way to the inward curve down into the softness of her maternal muff. "Do my legs. Now."

I stopped with my thumbs outside of her pussy. They were so damn near the nylon of her panties that my fingers trembled from the heat between her legs. As I pulled them away, I pressed my thumbs harder into her tender flesh and pulled outward, spreading her open between her legs like the velvet curtains of a...