"Mark," Sharon said finally, wriggling beneath him. "Would you mind… well, this sounds naughty, but would you mind rubbing my ass a little? Please?"

His hands stopped moving on her back.

"It really does hurt all the way down there when I get backaches, darling," Sharon purred reassuringly. "Please?"

"Okay, Mom."

He slid off her thighs and waited as his mother kicked the sheets to the foot of the bed. Then Sharon heard his sharp intake of breath, and could practically feel his eyes boring into her ass-cheeks. If anything could rival her enormous tits, Sharon thought complacently, it was her ass.

Mark's hands trembled as he laid them on his mother's ass. Sharon shuddered as he kneaded her ass, rolling her ass-cheeks under his fingers. She was sure he could see her hairy pussy, peeking out under the cleft of her ass, and perhaps even her puckered little asshole too.

"Rub my front too, Mark."

This time she didn't wait for permission. The wanton mother rolled abruptly onto her back, feeling her giant tits quivering as she now faced her son. Mark gaped at her. Helplessly he ogled the spongy, resilient texture and milk white flesh of his mother's tits. Her nipples were very large, as wide around as a baby's palm, and her rubbery teats protruded a full inch with her incestuous excitement. Sharon glanced at his crotch and suppressed a groan as she saw a rigid, absolutely enormous hard-on tenting under the towel.

"Come on, Mark," she cooed. "Don't be shy. Don't you want to rub Mom's big tits?"

Mark was too dumbfounded to notice her salacious tone. His trembling hands came down, the fingers digging gently into the spongy softness of his mom's huge tits. Sharon moaned openly as he kneaded and massaged her enormous tits, rolling and squeezing them, her stiff teats poking onto his palms.