"What's all this stuff coming out of your dick? Does this mean you're going to cum?"

Phil was too horny to reply. Bending her head forward, pumping furiously on his cock, Katy extended her tongue and pressed it to the blood-swollen head of his cock. She wiggled her tongue onto the cum slit, lapping up the juices oozing from his balls.

"Fuck, that really tastes good!" she exclaimed. "It's all thick and musky! Is it gonna taste that good when you cum?"

"Nnn!" Phil's bespectacled face was a mask of incestuous desire. "Suck it, Katy! Just like in the magazines! Suck off my prick!"

Katy flared her nostrils for air and pressed her lips to the pulsating tip of his hard-on. Tentatively, she kissed it, feeling her cunt throb and juice much harder as she got her first real taste of cock.

The cock was delicious; she was hornier than ever to give her brother a blow-job. Opening her mouth widely, the horny girl made a wet, gurgling sound as she took the knob of Phil's prick between her lips.

She closed her mouth just under the crown, forming a tight, compressed circle with her lips. Then she swirled her tongue all over the puffy prick knob, tasting her first wick. It was delicious!

Katy's clit started to tingle as she tongue-brushed her brother's prick, tugging on the fat cockshaft with her lips. She didn't know what to compare the act of cock-sucking to except suckling her thumb as a little girl. Except this big, stiff prick shaft was a lot larger than her thumb had ever been, and she had never derived as much pleasure from thumb-sucking as she did from this fat cock clogging her mouth.

Katy shut her eyes, concentrating on the taste and fullness of the cock in her mouth. Then she sucked in hard, making an obscene slurping noise as her cheeks fucked and her lips dragged tighter around his stiff prick.

"Unhh! Don't bite it!" Phil gasped. "Don't use your fucking teeth!"