"What the hell did you DO?!" Erin asked Joe, the two of them slathered in cum, and ankle-deep in it. "I don't know!" he murmured, staring upwards at his now 200 foot tall, giant-titted, ultra-cocked kid sister. "I knew it'd have hormonal effects on a younger subject, but....nothing like THIS!"
They were interupted by another booming, baritone moan. "MMMM......MEGA MEG'S ABOUT TO GET EVEN BIGGER! SO, SO MUCH BIGGER!"
The overswollen, overgrown girl moaned as her balls stretched and bloated outwards and downwards, hitting the ground below, forcing Joe and Erin to messily retreat away from Meg's groaning and ballooning scrotum--Meg looked down with a proud grin as her balls pressed against her ankles, then her knees, like an enormous beanbag chair beneath her. She took a few steps forward, splashing through her flood of sticky pre, feeling her balls drag behind her and leave a ditch in the ground behind her from their sheer weight, her pulsing, still swelling nuts churning and gurgling audibly as she cradled her grotesquely overgrown cock between her massive tits, clasping her lips around its meaty, purple head.
Joe and Erin looked back at the seven year old mountain of tits and cock, after having reached a forested hill a few hundred yards away. Meg's belly distended and engorged with each loud swallow of her own spooge, moaning with delight, and with pride, as it grew outwards--Meg looked as if she were pregnant with octoplets by the time she let her huge cock pop out from her mouth, emitting a loud, tit-jiggling belch.
"I...." Joe muttered, "I think I can recreate the formula at the lab at school! We have to stop her....YOU have to stop her, Erin....." They then winced as they heard Mega Meg moan once again, and yell "GONNA GET BIIIIIIIIIIG!" deafeningly.
Stretching, rubbery noises rang out from Meg's body, her giant belly receding, and the rest of her...growing. Joe's little sister rose to three hundred, then four hundred feet tall, her breasts pushing out from her torso like sweaty hot air balloons--and then, her cock.....it rose, it thickened, it fattened--thickened so much it forced the overgrown young girl to widen her stance again and again.
"Mega Meg's gonna grow EVEN MORE!" she laughed, shaking her hips and making her scrotum, boobs, and dong and all sway, shake, and smack against one another. "MEGA MEG'S JUST GONNA KEEP GETTING BIGGER, AND BIGGER, AND BIGGER!" She chanted, watching as her cock rose above her head, the shaft climbing into the sky, even as her breasts bulged forward in front of her, a flowing waterfall of cum flowing over them from her giant, spunk-belching dick.
"I can't reverse it!" Joe said, pulling his girlfriend in the direction of the school, "Only hope is to stop her with someone just as big.....or stop her from cumming and growing...the mutations could become exponential from here....."
A. Joe cooks up a growth flask for Erin....and she begins to grow into a monster-busted giantess, a mile tall and enough to hold Mega Meg in her hands. But that big, cum gushing cock swaying in front of her is hard to resist in her hormonally elevated state...
B. Joe's growth flask doesn't make Erin big enough! Mega Meg's hand breaks through the wall, picking his girlfriend up. "She's MY girlfriend now, big bro! I hope she l likes big dicks!"
C. Meg's growth goes exponentially haywire before they can reach the school--Meg's muscles, tits, cock, and balls swell up wildly. "JOEEE! MEGA MEG NEEDS TO BE BIGGER! MAKE MEGA MEG BIGGER, MAKE MEGA MEG GET BIGGER FASTER!"
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