Trisha opened her mouth wide and dropped her head onto the swollen, throbbing cock. The knob passed into her mouth, and she clasped her lips wetly around the shaft, sighing with pleasure as she felt the tip of his prick pulse deep down her throat.

I'm sucking his dick now, she thought excitedly. Oh, God, I'm finally doing it. I've got my brother's hard-on in my mouth. His dick is so very beautiful… I love how big and hard his cock is… yes, I do want to suck it… finally doing it… sucking a man's prick…

Trisha caved in her cheeks, instinctively increasing the suction in her throat. Her lips pursed and chewed around the center of his throbbing cock, as if intent on drawing it all the way into her mouth. Again she began to beat him off, milking his dick with her hand as her mouth sucked and licked and kissed the head.

"Ahhhh shit, Sis, ahhhh," Ralph gasped. He grimaced in feverish lust and began to writhe on the mattress, almost unable to bear the sweet intensity of his virgin sister's blow job. "You're doing fantastic… you're a natural born cocksucker! Suck really hard, that's what men like! Unhhhh…"

Trisha wanted to deep throat her brother as her mom had done. It made her very horny to imagine having all of his cock down her throat. She widened her lips and thrust her head almost violently into his cock, gagging slightly as another two inches of his thick prick passed into her mouth.

Ralph stared blindly at the spectacle of his sister giving him a blow job. Trisha's cheeks were pink with the energy of her sucking, and her lips were spread luridly apart around his gigantic cock. She looked like she was actually feeding on his stiff meat, like there was nothing more she wanted than to suck the hot spurting jism out of his hard dick.

Ralph grabbed Trisha by the back of the head and hotly moved his ass off the mattress, fucking her wet mouth.

"More of it, Sis, get it all the way down!" he grunted. "Ahhh, that's so fucking good! Suck it all!"