Katy folded her lips over her teeth, giving her mouth a strange shape as it luridly embraced the meaty thickness of her brother's cock. She sucked again, slurping less loudly, making Phil's big fucker throb wildly in her mouth.

More cock juice oozed from the tip; Katy rolled her tongue around the prick tip to lap it up. Then she sucked again, and again, until she was giving him a feverish blow-job, holding his cock in position with her fist so she could pleasure the crown with her mouth.

"Unh! Oh fuck, Katy!" Phil stared down at the spectacle of his young sister sucking wetly on his prick. "You're giving me a blow-job! I can't believe this! Ohhhh, fuck!"

Katy squeezed her hand tightly around the veined root of his prick, keeping her wide blue eyes tightly shut, thinking of nothing but the huge fuck rod stuffing her mouth. Even as her pussy burned, a strange feeling of contentment washed over her as she gave her brother head. It was like sucking on a pacifier, she thought, like the most delicious lollipop in the world.

Katy gagged slightly as she pushed her face towards his hairy stomach, for more of his prick meat between her lips. Then she sucked his cock harder and faster, growing accustomed to the skills required for a good blowjob, clasping her lips tightly around the aching shaft of his prick.

"I can't fucking take this!" Phil moaned. "Oh Jesus, Katy! I'm gonna cum!"

His cock was getting even bigger and stiffer in her mouth, Katy realized, and she could feel the thick vein on the underside pulsing rhythmically. Inspired, the horny blonde sucked more lasciviously than ever. She couldn't wait to drink, her brother's cum.

Phil lunged his hips at her, as if trying to fuck her face with his cock. Katy caught on quickly, and made little bucking motions with her neck, fucking his prick in and out of her lips.

Her mouth was full of saliva and his drooling pre-cum, and the blow-job became very loud as she sucked harder and harder; the slurping, smacking, kissing sounds filled the whole bedroom. Katy felt starved for cock, like she could never get enough of his cock. Violently, she fucked and bellowed her cheeks, as if trying to milk his prick.