The thirty foot seven year old giantess that was Megan suddenly moaned, her eyes squinting shut, a smile broadening across her face. Another moan, and her giant body began to emit stretching, gurgling noises. Her huge butt hit the ground below with a deafening crash, the remains of the demolished house pulverized under her multi-ton weight.
"The feeling from before...." she moaned, her other hand drifting between her thighs, "it's coming back....I think I'm gonna grow again!" she announced, happily. "I'm gonna be even BIGGER, Joe!" She pressed her brother against her bulbous tits as she shamelessly fingered herself with the other- loud, swampy, wet sounds emanating from between her legs as she masturbated her giantess-sized pussy.
"My whole body is tingling...feels like it's filling up....especially in my....my..." she moaned, pressing Joe into her rumbling cleavage, "....BOOBIES!"
Joe watched as his little sister grew up to 40, then 50 feet--it was hard to tell how large she was getting, as she was still seated--it was not difficult, however, to recognize the immensity of Megan's breasts--the gurgled and lurched outward in size relentlessly, her nipples rock-hard and pointing skyward as her mammaries grew more and more mountainous on her frame. Joe found himself dropped onto Megan's tummy as the overgrown preteen grasped her swelling tits desperately, squeezing nipples that were already nearly the size of her fists,
"My tits won't stop growing, Joey," she rumbled, squeezing their bloating masses, juggling their heavy flesh against each other wantonly. "I don't want them to stop growing....I want them bigger!”
Joe and Erin could only look upward in fascination as Megan's body lurched higher and higher, her voice growing deeper with each rubbery spasm of growth, her breasts gurgling and blowing up like balloons latched onto a water-faucet, darkening the sky above. His younger sister's boobs, even if she were normal height, were beyond the alphabetic bra sizes, now—twin bulging masses of flesh each as big as her whole torso, and still growing, her nipples nearly out of her reach.
“I'M “MEGA-MEG” FROM NOW ON, JOEY!” she boomed, drawing her hands back downward between her huge thighs, beginning to pleasure herself directly once again.
Joe then felt himself being grasped by his behemoth kid sister's hand, and lifted up past her mountainous tits. “The other grow-potion...” she panted, bellowing hungrily, “I NEED it! MEGA-MEG NEEDS TO BE EVEN BIGGER! MEGA-MEG NEEDS TO BE MUCH, MUCH BIGGER!”
A. Terrified, Joe empties the other flask onto his overgrown, overdeveloped sister's tognue—Mega-Meg begins to grow rapidly upwards into the sky.
B. Joe dumps the contents of the flask onto his sister's huge breasts, hoping to make Meg's mammaries so large that they slow down his monstrous sister. His plan works, but far, far too well....
C. Joe tries to bloat her breasts, but fumbles with the flask, spilling the formula downwards onto his sister's enormous crotch, which begins to rumble and gurgle violently, a thickening spire of cock-flesh rising out from between Mega-Meg's thighs.
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