I thrust my hips forward, sinking my cock into my mother's butt down to my balls.

"Uhhhhh," Mom grunted; the sound was low and guttural.

I pulled out, the lube helping me slide through pucker despite her asshole spasming around my prick. When just the head lay nestled in the viselike grip of Mom's asshole, I held still, trembling at the tight constricting torturing my glans.

"Fast, baby," Mom whimpered. "Do it fast. Oh, fuck, it feels better when you fuck my butt fast."

I slid back into my mother's rectum.

"Uh," she grunted.

My cock slid into the emptiness of her rear passage, but where her sphincter gripped my...