Marla leaned down and placed her warm lips against the cheek of her son's ass, kissing it moistly. Sally let out a soft mewl, and pushed her mouth to the other cheek, kissing it with a soft sound. Again, following her mother's lead, Sally brushed her lips about her brother's ass, imitating her mother's motions. Both of them, mother and daughter, kissed up and down Bob's ass, brushing their lips along the back of his thighs. When Marla began to lick his flesh, Sally did, too. They ran their wet tongues from the backs of his knees, up and over the cheeks of his ass to the base of his spine.

"I don't know what you two are up to, Mom," Bob said, "but I like it."

"Of course you do, you fart," Marla replied. "Just lie still and enjoy it."

"Let's turn him on, Mother," Sally said with excitement in her voice. "Let's make his cock hard again."

"I know just how to do it," Marla agreed. She lowered her face and lapped her tongue along the crack of his ass. Bob gasped as he felt her wet tongue drag along his ass-split. Sally giggled as she watched her mother, and then darted her tongue to the crack of her brother's ass, too. Bob, feeling those wet tongues swirl about his ass, began to writhe, his cock tingling.

"Keep, it up and I'm gonna be hard as hell," he promised.

Marla pulled at his ass, spreading his asscrack. She gazed at the crinkle of his asshole, and hearing the gasp from Sally, shoved her face between her son's asscheeks. She pushed her lips about his asshole and kissed it, then began licking the tip of her tongue up and down. Bob cried out, unable to stop the writhing of his ass.

Marla laughed throatily, and pulled her mouth away. Sally stared at her mother's tongue, watching the tip licking Bob's sack.

"Mother!" she squealed.