"I'm gonna come, sis," Bobby groaned warningly. She felt his huge prick swelling larger and stiffer by the moment as it bathed in the buttery wetness of her mouth. "Oh please, keep sucking it for me; I can feel it now gonna come so hard!"
Donna knew his balls were aching painfully. They were as over-sized as his dick, two orange-sized globes at the base of his cock encased by a hairy, wrinkled sac. Jacking him off furiously with her right hand, she fondled and warmed his nuts with her left.
"Coming, Donna!" Bobby groaned. "Unhhhhh…"
The cum pumped explosively from the bloated knob of his dick, shooting in a creamy gusher down Donna's throat. Donna tasted his salty jism as it spurted onto her tongue and whimpered happily. Just as her brother had been endowed with the biggest cock, his cum was the most delicious she'd ever sucked.
Again she gripped his squirting shaft in both hands. So she could jack him off as hard as she could and get out all of his burning cum. Donna sucked and jacked him off until her wrists ached.
Finally the total, throbbing stiffness of a coming prick went rubbery in her hands. By that time Donna had gulped down what felt like pints of cum. But she still hadn't been able to swallow it all. As she smiled at her young brother, creamy jism dripped from her face onto his legs.
"That was beautiful, Bobby. You've got the biggest dick I ever sucked. But can you keep it stiff for me now? I can't wait to feel such a big cock going up my cunt."
"Take off your bathrobe," Bobby asked anxiously. "I want to see you naked."
Donna looked at him curiously for a moment. Then she smiled knowingly and rose from the bed. Of course the sight of her body would turn him on, more than anything she could with her mouth.
The chances were he'd spent most of his childhood looking furtively for glimpses of her body when she was getting ready for bed, or climbing out of the shower. Sometimes Donna forgot how stacked she was, and how much a really voluptuous, big-titted woman could turn a man on.
"Okay, Bobby," she whispered. She kicked off her slippers and slowly let the robe fall from her bare shoulders to the floor. "Anything you want from me is yours."
Bobby gasped as his big sister suddenly revealed every inch of her dazzling nakedness. "Jesus, sis, your jugs are so huge," he sighed. "I always knew you really had big knockers, but… wow!"
His eyes moved from her large, firm tits to her slender waist and long, perfectly formed legs, until his gaze finally centered on the hairy, brown triangle of her cunt. Donna's pussy grew even wetter. His huge dick was getting stiff again before her eyes, swelling with blood as he studied the small, curly-haired slit that would open up for the invasion of his swollen cock.
"Don't you want to fuck me now, Bobby?" Donna climbed back onto the bed and knelt beside his supine body, shamelessly letting her stiff-nippled tits sway and jiggle over his chest. "I'll bet that'll feel better than a blow job. If you think my mouth was wet, wait'll you get your dick inside my cunt."
"Sit on it," Bobby croaked. He held his ten inch cock in his fist straight up, ready to tarn it in his big sister's pussy. "You'll have to, you know, show me some stuff. I never fucked a girl before."
"Oh, Bobby!"
Donna was delighted to hear that her brother was a virgin. It made her feel that much more tender towards him, and she'd always wanted to take a boy's cherry. Particularly one with such an enormous cock.
Climbing on top of him, she thrust her knees into the mattress to either side of his hips, so that her hairy, dripping pussy hovered over the purplish crown of his hard-on. Bobby withdrew his hand from his prick. Dropping her arm between her spread-eagled legs, Donna groaned as she held his cock upright and felt its meaty thickness pulse on her palm.
Slowly she lowered her ass, until the spongy knob pressed onto the dampened lips of her fuck slit. Donna undulated her hips to rub his dick all over her cunt opening, giving her pouting pussy lips a chance to loosen for the enormous cock that would soon be stabbing deep inside her belly.
"Go ahead, Donna!" Bobby grabbed her hips and looked anxiously at her cunt. "I want to feel it now. Put it in your pussy."
Grunting, Donna centered his cockhead between her cuntlips. Then she pushed down hard, and for a moment thought she'd pass out as the first inches of his rock-hard dick bored into the clasping, clinging tunnel of her fuck hole.
It was so big and thick, like she was fucking herself with the largest dildo in the world. With only a few inches of his cock buried in her hairy snatch, Donna had to stop so her pussy would stop throbbing. Every muscle in her cunt could be felt sucking and gripping around his cock.
Then Bobby started humping his ass, too eager to wait, trying to thrust more of his dick into her pussy. Donna took a deep breath and contracted her asscheeks. Then it was going all the way into her cunt, inch after inch of his hard-on stabbing into the stretching sheath of her pussy.
Fucking me now, Donna thought hornily. Oh, it is big! It's the biggest dick I've ever fucked! I don't know if I can take all of his meat. I've got to… my pussy's so wet! Oh God yes, going into me now… fuck me, Bobby… fuck my cunt with your big, hard cock!
She pushed down hard with a last convulsive bucking of her jiggling asscheeks, grunting as she took all ten inches of his meat into her pussy. For a long time then she sat motionless astride his hips, groaning and moaning as his dick throbbed and twitched deep inside her buttery cunt.
Bobby humped hornily beneath her, trying to ram his cock in and out. Donna stared down between her big tits and looked at her pussy, at the curly-haired pink lips stretching to suck around his cock. Slowly she lifted her ass and shuddered in ecstasy as his dick slid out of her cunt.
His dick was coated with her fuck juices now, and her cunt was open and wet. Donna started fucking her young brother, slowly at first, then quickening her rhythm as her aching pussy fed on the satisfying stiffness of his magnificent prick.
"It feels good," Bobby sighed. His lips curled in a smile of pleasure as his big sister's pussy clung tightly to his dick. Again he squeezed her hips and rocked his ass, thrusting his cock up to meet her strokes.
"That's right, Bobby!" Donna squealed excitedly. She fucked him faster. Her asscheeks jiggled as the mattress creaked beneath them. "You're doing it now! Oh yes, you're a natural born fucker! Do it hard, lover, that's what a girl likes! Slain your fucking dick in your sister's horny cunt!"
Bobby stared in fascination at her enormous, swaying tits. Instinctively he reached up and kneaded her tits with both hands, pinching the stiff, rubbery nipples with his forefingers and thumbs.
"That's good, Bobby, you're making me so hot!" Gasping, Donna bent her shoulders so that her jiggling knockers would graze his lips. "Suck them for me now! Oh, I'd love that! Suck my titties good while you fuck my cunt!"
His mouth opened, dosing tightly around the silver-dollar sized cap of her right tit. Bobby sucked her delicious nipple as hungrily as a suckling child. Wrapping his hands around her asscheeks, he fucked her much harder, punching his ass off the bed.
"I'm gonna come, Bobby!" Donna squealed. Her cunt was so wet that she could hear the squishing fuck juices as her pouting cunt slit clasped around his pistoning dick.
"Oh God, Bobby, I know I'm getting close! My cunt's starting to burn! Awwwunngghh! I can't believe what a huge cock you have! Fuck me with it now, harder, harder, as hard as you can!"
Sweating and panting, she pumped her pussy on his cock in a driven frenzy of incestuous lust. Bobby sighed and clawed her asscheeks, puckering and bellowing his cheeks as he sucked her tit.
Then they were both fucking as fast and as hard as two horny dogs, as if intent upon driving the mattress into the floor. Their bellies heaved and slapped sweatily together. Their grunting and moaning filled the whole house.