"I can fuck her, Mom?" he asked with trembling words. "You don't care if I fuck Sally?"

"Fuck her, Bob!" Marla insisted. "Fuck your sister!"

Sally, squealing with excitement, turned her back to her brother, jerking her skirt to her waist. She leaned over, looking past her shoulder at her brother, sticking her sweet, tight ass out.

"Come on, Bob! Fuck me before Mother changes her mind!"

Bob looked at his sister's naked ass when Sally leaned over on her hands. His cock was ready to burst, and Marla noticed it.

"Oh, Bob, ram that cock up your sister's cunt before you come!"

Then Marla had a thought.

"You can come, can't you?"

Bob nodded his head, his tongue pushing between his lips as his eyes became glazed with passion. Sally was on her hands and knees, waggling her cute ass with lewd invitation.

"Mother said you can!" Sally yelped hotly. "Come on, Bob! Stick it to me! Hurry up and fuck me! Mother said you could!"

Bob knelt behind his sister's shivering ass. He held his cock tightly at the base, staring at the cunt between his sister's slender thighs.

Marla couldn't sit there, couldn't be still. She slipped to the floor and crawled toward them, her eyes glazed with passion. She sat on her heels near them.

"Let me!" she hissed, taking hold of her son's cock with, one hand. Her other hand moved to her daughter's cunt, spreading her pink pussy-lips with two fingers. "Let Mother help put your cock in her pussy."

She pulled her son's cock forward, and made a hissing sound as she saw the swollen head of her son's cock enter her daughter's cunt.

Bob gasped with the wet heat closing about his cock.

Sally squealed as she felt her cunt part and stretch, feeling the head of her brother's cock sliding into her slippery, tight cunt.

"Ohhh, beautiful!" Marla whispered, her eyes staring at Bob's cock and her daughter's accepting cunt. "Shove it in her, Bob! Ohh, Sally, Bob is going to fuck you! He's going to fuck your pretty cunt!"