Joe looked around fearfully for any sign of a struggle. Any indication that his sister had been captured by some group to be experimented on or turned into a super weapon, fearing for her life. He allowed himself a slight sigh of relief when the campus grounds showed no such signs. He looked to the skies, half expecting to see her even more colossal form looming above, nipples longer than the average man was tall. His arousal to such thoughts provided him little comfort.
Yet the one direction he and Erin failed to look in was behind them and closer to the ground. They soon found reason to when powerful hands gripped their shoulders with surprising care. "Looking for someone, guys? Perhaps I can be of help!" an all too familiar voice giggled.
They turned around and saw a much smaller Megan... if an 11 foot woman could at all be described as "small". She was still just as curvy as ever, her huge breasts looming over their heads proudly defying gravity, and still seemed perfectly comfortable with being completely nude. "Actually, this isn't a bad perspective to see you from, bro..."
"Megan... What happened to you? Last I saw you, you could walk over houses with ease! Did the serum wear off?" Joe asked, his shocked mind going a mile a minute.
"I was hoping you could explain it to me, bro, in all honesty. Somehow, I can control my own size, just like GinormaGirl." Megan replied, biting her lip to stifle a sensual moan as she grew a couple feet taller, easily over twice Erin's height, before reducing herself to her previous 11 foot size to demonstrate. "I'm guessing this isn't something your growth serum was supposed to do?"
"It's supposed to be a blend of anabolic steroids and hormones designed to stimulate musculoskeletal growth and development of secondary sexual characteristics in its intended targets."
"In other words, a growth serum that would give me some honest-to-god boobs." Erin added, relieved her boyfriend's sister is safe despite the unusual surprise. "Anyway, there's something you should know that we found in our tests, which might relate to this new trick of yours, but it can wait until after we get something to eat... and get you something to wear."
Megan followed Erin to her dorm, ducking inside and practically filling the width of the hallway. One awkward trip up a flight of stairs later, they and Joe soon reached Erin's room. Megan marveled at it all, appreciating being able to fit indoors again. "Wow... This seems cozy!" she remarked, smiling despite having to crouch to avoid her head and shoulders going through the ceiling.
"My last roommate finished her degree recently, so I'm the only one living in here at the moment." Erin explained. "Can you shrink to your original size? It'd make clothing you a lot easier."
"Sorry, but I think I'm at my smallest already." Megan apologized. "That includes my figure, as well. And if I'm being honest here, I'm not really tempted to try that hard to get any smaller than this. I love being huge, and we both know Joe likes this, too." the amazon pointed her thumb towards her brother. "But do I really need to wear clothes? Feeling the air against my skin is so nice..."
"Can you create something to cover yourself up at will?"
"...Well, no, but -"
"Then you need clothes. Don't worry, I've had an idea in mind to deal with that for years now... even though I'd hoped it would be me as the giantess needing temporary cover..."
Half an hour of careful "liberating" of bed sheets, struggling, and decidedly colorful cursing later, Erin looked upon her work approvingly as Megan stood, as best as she could in the room, garbed in a multitude of bed sheets, tied together into a makeshift toga. As slapdash as it was, it worked with her size and figure to give her a look not unlike that of a Greek or Roman goddess. The look was only magnified once the three of them were outside and Megan was able to fully stand, casting Erin and Joe in her shadow.
A short time later, she loomed within the McDonald's on campus, silencing staff and customer alike even after giving them a friendly wave. Seeing as how everything was almost comically small to her now, Happy Meals clearly wouldn't be enough to satisfy her. She kept this, and what she guessed would be people's expectations, in mind when it came to be her turn to add to Erin and Joe's order.
"So, what was it you wanted to tell me earlier?" Megan asked after finishing her second burger, "What did you find?"
"Your hormone levels are insane, for starters, and your secretions are very similar to the original formula."
"So you're saying I'm like a walking fountain of your growth serum? Does this mean I'll grow who or whatever drinks my fluids, bro?"
"Kind of, but what comes out of you is far more diluted than the original formula, Meg."
"We also don't actually know if the serum does anything on its own yet. You see, our tests uncovered microbes forming a symbiotic bond with your cells, enhancing them greatly." Erin explained, "They must have reacted to the serum."
"I guess they must be responsible for me being able to change my size like this..." Megan remarked thoughtfully, "But where are they from? And who - or what - made them? I don't believe germs that benefit human hosts specifically are natural."
"Not ones that exist outside the intestines, anyway." Joe nodded. "It's definitely worth keeping an eye out for."
"Hey, uh, seeing as how I actually can be small enough to fit indoors... would you mind an extra, albeit very large, set of hands helping with the serum, bro?" Megan almost pleadingly asked, "Don't we have a common interest here? I still want to make it up to you for accidentally destroying your lab..."
Joe thought about it. On one hand, while she's physically and mentally an adult now, and had always been smart, his sister still lacked the education in biology he and Erin had, among other fields. On the other hand, they could give her that education, and she'd probably grasp the basics quickly enough. More importantly, she had invaluable insight from her experience with the serum that he couldn't ignore.
Besides that, he had to admit he couldn't say no to her now even if he wanted to. "You're more than welcome to help, sis. However, there's a lot you'll need to learn as well... unless you want to go into grade 3 looking like that." he replied, snickering at the mental image of his buxom sister struggling to sit in far too small desks among normal kids, likely bored to tears.
"I'd rather a crash course of the essentials from you and Erin, thanks. I think I've learned more from you than I ever did from school anyway." Megan stated, giving her brother a playful punch on the shoulder that clearly struck with more force than she intended. "I really need to learn my own strength while I'm at it..." she muttered sheepishly.
Just then, a young man approached their outdoor table. From the looks of it, he was likely the university football team's star quarterback. "Heyy, babe..." he greeted, "How about we ditch these losers and I show you a real man?"
Megan smiled at the man and asked, "Oh, really?" The smile quickly vanished as she rose to her full height, hands moving to her hips disapprovingly. "I don't think you're man enough to handle me, little boy." she growled angrily. Her makeshift toga appeared to tighten around her voluptuous frame as she inched towards 12'6". "Leave me, and never seek to bother us again, loser, or your team may be looking for a new player to replace you!"
The young man, pale as a ghost, fled the moment Megan stomped the ground with her bare foot threateningly. "H-holy shit, girl... Y-you weren't going to crush him were you?" Erin stammered.
Megan breathed a sigh of relief, allowing her body to return to its previous 11 foot size, before addressing the question. "What? NO! I just wanted him to leave us alone! He might've ended up with a shattered pelvis considering I'd probably kick him hard there, though..." Then, as to change the subject, "And it seems it's too much to ask for whatever I'm wearing to grow with me... not that what I was wearing back home did when I initially grew, but still!"
Joe nodded in acknowledgement. They'd need to find someone willing to make clothes for someone of Megan's size, at least something casual yet flattering so she'd actually want to wear it. If his size ray hadn't been destroyed under nearly thirteen tons of his sister crashing down on top of his lab, and it actually worked, this wouldn't be a problem.
However, that was a problem to address later. As his girlfriend pointed out earlier, they needed to see if the growth serum actually worked on its own. Megan had drank enough for a dose to cause her... dramatic transformation, but if it worked on its own, they needed to just slip a little in to someone's drink so as to not rouse too much suspicion. This would take a little time, but maybe he and his sister should head home first. Who knows? Maybe their mother would let them off easy if offered a variant of the serum like his sister suggested?
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