"Don't try to wallow it, darling," Marla laughed. "Take it slow and easy until you learn how."

Sally bobbed her sweet face up and down her brother's cock, sliding her lips halfway down then up. Marla watched, caressing her son's balls. With a soft mewl, she shoved her face down and began to kin at Bob's balls feverishly, holding them in her palm. She licked at the base of his cock, pressing his hot balls to her cheek.

As Sally lifted her mouth to breathe deeply. Marla raced her lips up the shaft and swallowed his cock swiftly. Her mouth bobbed up and down, taking every inch of her son's wonderfully hard prick, her lips banging at the base and then up to his cockhead. She twisted her lips around his cock, and then turned him loose, offering it to her daughter once more.

Sally didn't hesitate this time. She closed her lips tightly about Bob's cock, gulping half way down it. She pumped her mouth up and down, making low sounds of delight. Marla pushed her face into Bob's crotch again, licking at his balls, thrusting the tip of her tongue beneath them and bouncing them lightly.

Bob twisted his hips, but was careful not to shove his cock into his sister's sucking mouth. His balls ached again, and his cock was very, very hard.

"Oooh, it feels so good!" he gasped, staring at his sister's stretching lips. "Your mouth is very hot, Sally! Ohhhh, suck my cock, Sally! Suck it as hard as you can!"

Sally sucked wetly, diving her face up and down. The more she sucked, the better she loved it. She understood her mother's words now, and she sucked with intense enthusiasm. Marla, watching her daughter with perverse pleasure, whispered: "You're a natural, Sally. You're a natural cocksucker, baby! Ohhh, suck that cock, honey!"

Marla, her face close to her daughter's, pulled her son's loaded balls into her mouth, sucking them hotly as she watched Sally's mouth fucking Bob's cock. Seeing those sweet lips stretching, knowing her daughter enjoyed that hard cock in her mouth, created a wanton desire within her naked body she had not felt in a very long time.