(note: Switching to third-person perspective, following Kimi)
Kimi entered her room and colored - for about a minute. Once she was confident her current babysitter would not distract her, hearing him laugh at some mindless drivel sitcom on the TV downstairs, she pulled out a diary and wrote down some notes. "8-19-2016: My parents have left on the business trip I covertly arranged for them. The babysitter, Matthew Sampson, spent 2.2 seconds staring at my legs longer than necessary. Interestingly, he did not immediately recoil when our eyes met. Do I drop the facade and inform him that I am quite possibly the most intelligent mind on this planet, even at my young age? Do I dare?"
Thinking about it for a second, she shook her head and wrote, "No. I cannot afford to scare another babysitter away. Matthew is undoubtedly straight, so I may be able to coerce him to stay with me despite my intellect, provided my formula is successful. I wish I could wait until I was older, but if I have to endure the ABC's song again, I'll scream. I will finish my formula tonight and study Matthew's reaction."
Putting her diary away, Kimi uncovered her pride and joy - a lab she built from a My First Chemistry kit her parents bought her awhile ago, along with a few other things that had mysteriously gone missing. Its colorful, childish exterior hid its true purpose, and she'd also acquired a number of chemicals under her parents' names for her formula. While working, she gave a mature chuckle. Scientists believed the laws of nature were rigid, inflexible. She saw them as mutable, and would use this to achieve her rightful place above humanity: a giantess as beautiful as she was intelligent. The idea had been in her head for almost as long as she could remember.
Finally, after an hour, her efforts had produced a small number of vials of colorless, odorless liquid. The child genius had double and triple-checked the alarmingly complex calculations to make sure everything would work as intended. "Well, hopefully I don't poison myself with my own formula. If this works, I should start developing in a matter of hours." Kimi noted before downing the first vial, shivering as its contents worked their way down her throat. "Ack! A shame it has to taste like cough syrup..."
"Kimi! Dinner's ready!" Matt called from the bottom of the stairs. Kimi quickly and quietly put her lab away, setting the coloring book back in place before heading downstairs. The pizza presented in the kitchen was simple, but she could feel her formula going to work in her stomach already. She would need a lot of calories to fuel the beginning stages of her metamorphosis.
"Holy cow, Kimi... I didn't think you could eat so much!" Matt expressed as she devoured her fifth large slice.
"I guess I'm a growing girl, so I need to eat a lot." Kimi replied, trying to keep her language to what would be expected of a 6 or 7 year old, all the while studying her babysitter.
"Hm, well you are quite a bit bigger than Jenna, whom I'm pretty sure babysat you before..."
"Yeah, though I overheard her tell my mot- mommy that she won't babysit me anymore. Am I that scary?" Kimi asked, almost letting mother slip from her mouth, a word no child her age would say. She knew she'd have to drop the facade soon, but for now she needed to maintain it.
"I... uh... n-no, I don't think you're scary..."
"Aw, thanks, Matt!" Kimi cheered genuinely, getting up to wrap her arms around him in a tight hug - a hug that they both noticed her slightly shifting upwards against his torso. Her Hello Kitty tee shirt and shorts had become just slightly more snug on her body, but for the sake of the facade she played oblivious to her changing body. "Say, wanna watch a movie with me?" she asked, giving her best puppy eyes, the same ones that convinced her parents to buy the chemistry set in the first place.
Predictably, Matt couldn't resist, and obliged Kimi. She rooted around in the DVD drawer, intentionally waving her butt in the air as she did, before finally picking one. She noted how long he'd been watching her, and asked him to set the player up while she went to the washroom, instead going into her room to jot down the times and quickly measure her height: 4'11". Since taking her formula, she'd grown an inch, and could tell by her tender chest that she was developing elsewhere. "Yes!" she cheered quietly, before slipping back out to watch the movie and Matt's reaction to her development.
Kimi's growth continued throughout the movie, but it wasn't all that was happening. Little by little, her body was correcting her physical imperfections. Her wisdom teeth, only just starting to develop in her gums, were broken down completely, with no trace left. The scar on her knee she got from falling off her bike slowly faded, while her hair began to grow finer everywhere except her head. All the while, she made sure to subtly draw Matt's attention to her, noting how it took him longer to look away each time.
At last, it was bedtime. Kimi elected to change in the washroom, taking some time to examine herself fully. A cute raven haired 8 - 9 year old girl seemed to stare back at her in the mirror. Her nipples felt puffy and sore, and her abdomen was flat as a board. While she couldn't see it directly, she understood her digestive tract was becoming more efficient. "The formula has met my expectations so far. The morning should be quite interesting." she said to herself as she finished squeezing into her pajamas.
Indeed, as Kimi slept, her body continued to develop. Some of her baby teeth withdrew into her gums, replaced with perfect adult ones. Not only were they toothpaste commercial white, they were impervious to anything that would ruin their perfection. Her skin was slowly doing likewise, making it harder for her to be injured. Her face also matured a little more, yet still undeniably Kimi, and breasts graced her chest, albeit barely enough to fill a training bra. The changes ceased at the stroke of midnight, the first dose of formula having finally run its course.
Early the next morning, Kimi awoke to examine herself. Her pajamas were now woefully inadequate to cover her body, the bottoms seeming almost painted on. A pair of scissors solved the problem of removing them, requiring her to slip on a pair of larger panties. In the washroom to shower, she was pleasantly surprised to find an attractive 13 year old version of herself staring back. She'd only just got out of bed and her hair already looked like she'd carefully brushed and washed it. Still, no reason to deviate from her routine.
After a surprisingly pleasant shower, the young genius proceeded downstairs to the kitchen, discovering Matt fast asleep on the couch. Somehow, he snored worse than her father. She didn't want to know what this was doing to his brain cells. Regardless, she prepared some coffee, only to unintentionally wake him. "Kimi... What are you doing?" he yawned.
"Making coffee."
"...in your underwear?"
"I wasn't expecting you to wake up, Matt. I... wanted it to be a surprise!"
"You're way too young for that kind of thing."
Almost visibly cringing, Kimi replied, "But... but I wanted to surprise you with coffee! Mommy says lots of grown ups like coffee. You're a grown up, aren't you?"
"Well, k-kind of, I guess. Thanks any... way?"
Kimi watched Matt rub his eyes twice as he stared at her in clear disbelief. "What's wrong?" she asked, trying her best to look innocent and clueless. A feat that had been growing increasingly difficult with each passing day.
"Uh... I... uh... Is it just me, or have you grown?" Matt managed to reply, blushing.
"I'm a growing girl!" Kimi stated, perhaps a bit too proudly, puffing out the chest not even 7 year old girls should have.
"...Yeah, and no one grows boobs overnight, especially not little girls." Matt responded, growing suspicious. "I've heard all the rumors about you in school, Kimi. Why no one wants to babysit for the Thompsons anymore. Like how you completed some of Carrie Walker's math problems. Finding advanced equations in your coloring books. Studying-"
"Studying their textbooks?" Kimi finished, recognizing the gig was up. "Yes. It is all true. Let me put this in perspective: I, Kimi Thompson, am far more apt to teach your high school courses, right now, than those actually paid to teach you. I am intelligent enough to comfortably call Sheldon Cooper from The Big Bang Theory an idiot - in his fields of expertise."
"D-does this mean you're going to make me disappear?"
"No, but I implore you to stay during my transformation, if not longer. I honestly hope I haven't frightened you like I have with my previous babysitters. You would not believe how trying it has been to keep the illusion of "socially accepted normalcy" even in front of my own mother and father..." Kimi confessed, abandoning the coffee machine in favor of the Keurig brewer. "Now then, I know not the kind of coffee you like, so I'll give the options of original Starbucks, McCafe latte, or McCafe cappuccino. I'm claiming the last of the French vanilla K-cups."
"W-why am I being pressured into those choices?"
"Because that's all we have currently. If you want other choices, we'll have to buy them, though I'd like to restock on French vanilla if it's all the same to you."
"Fine, I'll take the Starbucks one, but could you please get dressed?"
Kimi nodded and headed for her room after setting the brewer up. For fun, she put on some of the most tastefully revealing clothes in her surprisingly vast wardrobe. Yet as she was about to exit, her brown eyes fell upon the remaining doses of her formula. A part of her was eager to take the next dose, which could leave her with a model's body and physically looking down at Matt over the next several hours, but the more rational part wished to let him adjust to the real her before pushing forward with the next dose. An interesting conundrum...
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