Mega-Meg's mega ass was crushing the remnants of Joey's lab.
The only bit of remaining growth potion was now far out of his girlfriend's reach, but he knew two things.
One, his seven year old sister was not malicious. She was currently grasping him as lightly as she could, like a doll, and waggling her big, oversized fleshy tongue up in the air, expectantly waiting for her growth potion. This alone was causing his erection to expand in his pants, but thankful his sister knew nothing of such things yet.
She was also highly distracted by the new, amazing feelings being produced by the gentle, exploratory strokes of her new, fattened, furred and developed vagina.
The other thing he knew was that the potion only worked on girls. Maybe the gigantic tits should have made that obvious. His nerd mind quickly hatched a plan.
As with all good nerd plans, he pretended to fumble.
The beaker went flying out of his hands, a few choice drops landing on Meg's huge right breast, and plopped itself firmly out of sight into her outrageously fattened cleavage.
His plan quickly went awry.
"Oooooh Joey." his sister cooed.
"You really do like my boobies!"
Her voice vibrated the word "boobies" as chest starting to shake.
Joseph looked down and was greeted, to his horror, by a shuddering and rising breast. The bright, fat drops of liquid completely absorbed as it puffed up higher in front of him, bigger than the other. Bigger and bigger, blocking his field of view as it swelled.
Both gigantic tits were now shaking and rumbling with a violence that knocked loose paintings and lamps in the parts of the house still not destroyed by the young girls mega-expansion.
Her (BIG) little fist gripped even harder around Joey as she looked upon her violently shaking new cleavage with fear, making the second part of his plan go awry.
Joey's plan had 1. to cause enough of his potion to spill off his sister's tits so that Erin could get some and grow (to what end he'd figure out later) and 2. for his kindly and goofy, growing sister to drop him in her fascination at her bigger boobs.
Neither of these was happening.
What was happening was Meg's tits.
Suddenly, they BLOOMPED up so big they slammed into her face and slapped down into her lap, causing her to drop Joey in alarm.
He fell the thirty feet onto the backyard's trampoline and bounced several times into Erin's waiting arms.
The second part of his plan had succeeded, now for the first.
"Erin! We have to stop my sister! She's still going through some sort of super-puberty and who knows how big she'll get!"
"Oh Joey! Are you all right?"
Joseph's beautiful but flat-chested girlfriend ignored his frantic pleas and stroked his face with concern. He looked up at his sister's still-growing tits.
Their rubbery masses had now expanded all the way out to her feet, her underboob squishing up and over her cute girly toes.
There was no chance she could reach her huge nipples.
One arm was spread out across her vast bulging mams, the other, her left, was not visible, although the breast on that corresponding side was violently humping up and down as his seven-year old sister, now fully a 50-foot woman, discovered herself.
"We have to get you some of that growth formula." he said in a very low voice.
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