Occasion for growth

"Take off your shorts," John commanded, no longer asking but telling her, his voice leaving no room for argument. "And get on the bed. I'm going to fuck you, big sister. And I do mean 'Big'," he added, giving her now huge tits a firm squeeze.

Sarah's breath hitched in her throat as her manhandled her, but she slipped out of her shorts without hesitation, pulling her panties down with them, revealing her completely hairless pussy, and with one last thrust of her chest into her brother's hands, pulled away fro him and flopped backwards onto the bed, spreading her legs invitingly.

John gazed own at her hungrily, and she lightly thrust her pussy up at him hungrily. He undressed in a rush, his hard cock springing free as he removed his pants. He approached the bed, eager to lay claim to his sister's body. He swung himself over to kneel on the bed and shimmied up between her wide-spread legs, his dick bouncing up and down just above her open lower lips. He looked her over, taking in her pink pussy, tight stomach, huge tits, and finally locking eyes with her, seeing the heat in them. She looked down and grabbed his cock with one hand, and he though he saw a momentary twinge of disappointment in her eyes as that one hand completely covered his length.

Sarah noticed his the distress in her brother's eyes at this and began to jack up and down his shaft. "Come on, bro. You said you were gonna fuck me," she added sexily, pulling him by the dick toward her pussy, spreading her legs enticingly, though to John's eyes it all looked a little ****.

John looked down as she moved her hand back and forth on his dick, but noting that it was not moving very far each time. "If only my dick were bigger," he mused, then looked down in shame, not able to meet her gaze... and ended up looking directly at her new, huge, jiggling boobs. He grinned as an idea occurred to him.

"Sis, make my dick grow. Every time you jerk my dick, make it grow a little. Keep going until it's the perfect size for you," John commanded confidently, hoping this would work. Sarah continued to stroke John's cock as he looked on in anticipation, working it with skilled fingers, and he felt a tingling sensation in his cock. Her strokes began to get longer, as he felt and saw it grow under in her hand, lengthening and thickening. After a few strokes, Sarah had to grab him with her other hand as well so as not to have a hard time jerking him off as his length and girth increased. John let out a low groan of pleasure as the tingling died down, his sister's hands continuing to work magic on his now-massive cock. Where he had been average before, 5, maybe 6 inches and not very thick, he had to be at least 11 now, by his best estimate, and very thick.

"Size queen," John teased, smirking down at Sarah's flushed face.

His sister just laughed, her eyes shining with excitement and arousal as she fondling his shaft. "Guilty as charged," she said, licking her lips in anticipation. "Now come here and put that big beautiful dick inside me."

John needed no further encouragement. He leaned over her and she guided his thick shaft to her entrance, gasping as the head of his cock pushed against her tight opening. John penetrated his sister with one long, slow thrust of his hips, his large dick spreading her wide and sliding deep into her welcoming heat, her tightness fitting around his new tool like a glove, massaging and gripping him perfectly. Sarah cried out in pleasure, her back arching off the bed, boobs rippling enticingly, as her brother filled her completely.

"Oh God, yes," Sarah moaned, her fingers digging into John's shoulders. "Fuck me, little brother.Use me! use my pussy! Fuck me hard with that giant cock."

John began pulling out of her, then thrusting his long, thick shaft back in to Sarah's tight pussy in a steady rhythm, marveling the vice-like grip of her warm walls with each stroke, how they tried to keep him from leaving her warm interior each time. John couldn't keep his hands off Sarah's massive breasts, groping and squeezing them roughly as they fucked, pinching her hard nipples between his fingers. Sarah moaned loudly, arching into his touch, clearly loving every moment of her brother's attentions. John release her firm globes and moved his hands to her hips, fucking her harder as he watched her pendulous breasts flying up and down with his strokes.

"Fuck, you're so big," Sarah gasped, her eyes rolling back in pleasure as John hit a particularly deep spot inside her. "You are so deep. So big! I've never had one this big before. This deep. Your dick is perfect, it's just so perfect, just like you said!"

John grinned down at her, thrusting harder and faster. "You love it, don't you?" he said, his voice a low growl of desire, punctuating this with a particularly hard thrust. "Admit that you're a size queen, Sarah. That you need big dicks to fill you up." he paused, his dick just barely inside her, making her whine in frustration.

"Yes!" Sarah cried out, and he rewarded her by resuming his thrusting, even harder and faster than before, her body writhing beneath him in ecstasy, her hands coming up to grab and maul her new breasts. "I'm a size queen, brother. I love this big fat dick inside me!"

Spurred on by her words, John slammed into her with wild abandon, the bed shaking underneath them, grabbing her boobs again, fondling her tits, squeezing and molding them, thrusting them up and down in time with his thrusts into her cunt, his sister up on her elbows pressing herself into his hands, thrusting her cunt back onto his dick, trying to get hi deeper inside her. He could feel Sarah's tight walls clenching around him, signaling her impending orgasm.

"Cum for me, sis," John said, his fingers tweaking her nipples roughly as he continued to pound into her. "I want to feel you cum on my cock."

With a scream of pure pleasure, Sarah's body convulsed as wave after wave of ecstasy washed over her. Her pussy clamped down on John's dick, milking him as she rode out the intense orgasm. It was the greatest sight John had ever seen, and he didn't let up, continuing to fuck his sister through her climax, watching as he drove her still higher on that peak, not letting her come down. He could feel his own orgasm building, but was determined to make Sarah cum again before he finished.

As Sarah's orgasm began to subside, John grabbed her nipples and pinched just a little, pulling on her new, bigger breasts, stretching them just a bit, marveling at how they deformed. He pinched and pulled the sensitive buds in fast circles, matching the pace of his thrusts, and it wasn't long before Sarah was crying out in pleasure once more, another powerful climax ripping through her.

Feeling her tight pussy spasming around him for a second time, John finally let himself go. With one final, deep thrust, he buried himself to the hilt inside Sarah and released, shot after shot of his hot cum filling her completely, groaning in satisfaction.

Spent, John collapsed on top of Sarah, her massive breasts a pillow squishing between them as he lay there, fully embedded inside her still-pulsing pussy. To John's surprise and delight, he didn't feel himself going soft; instead his dick throbbed inside his sister with renewed desire.

Sarah seemed to sense his continued interest, or maybe just to notice that his dick was still hard and still spreading her open delightfully. She wrapped her legs around his waist, pulling him closer as flexed her interior muscles along his length and looked up at him with a sultry smile. "Seems like you're ready for round two, little brother," she said, wiggling her hips slightly so that he could feel every inch of her soft pussyflesh gripping his hardness inside her.