Nancy had always been shy and awkward. She was overly self-conscious about her body, being short and chubby. Her reclusive nature kept her skin exceedingly pale, and her lack of confidence made it hard for her to make friends. She effectively had no connections to anyone, so when Nancy received an offer to volunteer as the test subject in a new procedure that could alter mind and body to make one more confident in themselves, she jumped to the opportunity posthaste.

"...and sign here." A man at a desk handed a pen and document to Nancy. "This is just the agreement that you accept responsibility for any potential disfigurement. Basic stuff."

"R-right..." Nancy signed the last of the papers in sloppy handwriting.

"Alright, just down the hall and it's the last door on the right." The man at the desk pointed. "Dr. Fleming will assist you."

"T-thank you." Nancy walked down the hall to the door.

"Hello, you must be Nancy." A woman in a lab coat reached to shake her hand.

Nancy hesitated to reciprocate the handshake, before extending her arm, with her hand firmly tucked within the sleeve of her turtleneck sweater.

The woman in the lab coat enthusiastically shook Nancy's hand. "I'm Dr. Fleming, I'll be overseeing your procedure today." Dr. Fleming led Nancy into her office. "There's a curtain in the corner, if I could ask you to dress in one of the gowns in the cupboard.  They're one-size-fits-all."

"Um... Do I need to... get... Should I fully... undress... for it?"

The doctor began logging into the computer on her desk. "Depending on how things go, your clothes might not fit anymore, so it would make things easier."

"R-right." Nancy began undressing in the privacy of the curtains, and put one of the gowns on. She felt a bit exposed in the gown, short sleeves and her lower legs and feet bare. Not to mention the slit down the back that had the potential to reveal too much. She made sure to always face the doctor to prevent that from happening.

Dr. Fleming pulled up a program on her computer. "Alright, so what kind of changes are you looking for in yourself?"

"Um... Well... I was... I was thinking that... maybe being a bit... prettier? Maybe t-taller? Thinner? Some more um... general attractive... traits; s-sexy and... all that, and also some... you know... confidence?"

Dr. Fleming began filling some checkboxes into her computer program. "I think we can work with that. I'll start with a low formula concentration value and we can work from there. This number may sound arbitrary, but we'll start with a concentration of 10,000 for reference. The highest we've gone in these tests is 30,000 and that's been fairly moderate and realistic, so just relax." She typed 10,000 into the computer... or at least, she thought she did. In reality she didn't notice that she added an extra zero. The formula concentration listed on her computer now read 100,000. More than three times the highest tested value. Beside the computer, a small vial began filling up with the highly-concentrated formula. She inserted a syringe into the formula and drew out a specified amount. "You might feel a little prick, and some soreness, but it will go away quickly."

"A-alright."

Dr. Fleming sanitized an area of Nancy's arm, then injected the formula in the site. Nancy flinched before relaxing. Dr. Fleming removed the syringe once it was empty and disposed of it in a container on the wall. "There, that wasn't so bad." She applied a bandage to injection site. "You will start to see changes within the next few minutes. You will feel your bones and other tissue moving around and changing shape. It won't be particularly painful, but it might present some slight discomfort."

Over the course of the next minute, Nancy felt slightly disoriented, before realizing she was getting taller. She watched in amazement as her arms, legs, torso, and the rest of her body lengthened, and became thinner. She began to take on an hourglass figure, and also noticed her skin starting to tan. Her chest, rear, and thighs weren't getting thinner however, and were instead getting larger. Nancy quickly felt embarrassment, but the embarrassment uncharacteristically started to fade.

Dr. Fleming relaxed in her chair. "The changes should be stopping within the minute. How do you feel so far?"

"I feel... amazing! I... wow. I mean, I was scared before, but I feel great! I can actually talk without stuttering! I was suspicious about your procedure being able to change the mind but this is actually just... amazing!"

"That's great to hear."

Nancy continued to grow taller, nearing 6 feet tall, her legs began lengthening faster than the rest of her body, and her feet lengthened as well. "It's a shame my old shoes won't fit. Hah, oh well." She felt her chest continue to swell, and her stomach continue to shrink. She wrapped her arms close to press the fabric under her chest and lift. "Look at these things! Haha! You can even see my nipples bulging through the fabric!" She pressed into her stomach. "I've got abs too!"

"I'm glad to hear you're satisfied. The changes should be stopping very soon." But they didn't. Nancy was now nearing 6 foot 8 inches. "That's not right..."

"No this has to be right. I feel amazing!"

"That's not what I mean... let me check the input values again."

Nancy continued to grow, soon so tall that her bare crotch was now visible under the bottom of the gown.

Dr. Fleming had a realization and turned around to speak to Nancy before realizing what she could now see under the gown. "Th- Miss! You may wish to cover up."

"Hm?" Nancy looked down at her now-bare privates. "Oh I see. Well that's just a normal part of the human body. I assume you've seen a few of them, you know, as a doctor and all."

"Uh... regardless. I realize what the issue is. I accidentally input another zero into the concentration level."

"Well I see no issue. I say keep these changes going!"

"That... is kind of required. We can't afford to add formula to reverse the affects while you still have some in your system."

"Not a problem at all, hon." Nancy watched as her skin continued to tan, although her pubic region didn't. She lifted the gown and noticed that the tan was in the shape of a bikini bottom. Not only that, but the already pale skin where a bikini bottom would be was getting even paler. Nancy soon felt her chest being constricted by the gown and began removing it.

"You don't have to do that in front of me. You can still use the curtain."

"It's alright. I'll be honest, I'm not even sure why I used the curtain in the first place." Nancy fully undressed, revealing extremely pale tan-lines for a bikini top as well. Her tanned skin grew darker and darker, soon reaching near pitch-black, and her tan-lines grew paler and paler, soon reaching a stark white. The only parts that didn't change color were her ever-growing nipples. Her areolae grew to extreme sizes, and her nipples became larger than a thumb, and yet still grew. She looked down and saw her feet had grown much longer as well, now more than 16 inches long, and weren't stopping any time soon. Her head was getting close to the 8 foot tall ceiling. She mentally measured that her hips were now wider than the door to the office. Her chest was now sagging down past her belly-button, soon low enough to cover her ever-growing privates. The inner and outer walls of her womanhood swelled, and her bulb grew to an extreme extent. Her donut grew puffy, and was soon so large that it gaped open at rest, large enough to fit a watermelon without stretching. She looked back at it and watched herself clench and relax, giggling at the sight of her massive sphincter. She opened her mouth to talk, but her tongue rolled out. She held it in her hands. It extended from her mouth at least 14 inches. She released it and felt it flop onto her overly-inflated lips.

Dr. Fleming watched in embarrassment, and soon, the changes eased to a stop as Nancy's head touched the ceiling. Dr. Fleming breathed a sigh of relief. "My apologies for the mix-up. We can get you some clothes for now, and schedule a follow-up where we undo this little mix-up."

"No need." Nancy analyzed her body. "That is, no need for either of those." She admired her new form. Her skin was pitch black with blinding white tan-lines. Her chests were so large they sagged down to her knees and her nipples were larger than fists. Her hips were almost as wide as a double-door frame and her sphincter could comfortably fit a pumpkin, maybe even a large beach ball if she stretched it. She had to bend over slightly to fit under the 8 foot tall ceiling, and her feet were just over 24 inches long. Her tongue drooped out of her mouth so far that the tip rested within her pubic hair, and her lips were much larger than a bagel. Her form was more muscular than most male-body-builders. Her labia majora was as large as most peoples' buttocks, and her labia minora drooped out a few inches. Her bulb was as large as a baseball.

Dr. Fleming sighed. "You will need to cover yourself on your way back to your car."

"My... car?" Nancy scratched her head. "This may sound weird but I don't remember where I parked, or what my car looks like. Actually I don't even recall having a car."

"That's... strange, but you should still be able to find it if you beep your car keys. They should be with your belongings by the cupboard."

Nancy walked over to her old belongings. "These don't look like they're mine."

"Oh dear."

"I don't recall ever wearing these, and this license is clearly not mine. You'll have to find whoever Nancy is, and return her stuff to her." She scratched her head. "My stuff should be... Actually I don't remember having anything... It would be under the name... I actually don't recall ever having a name. Now isn't that funny?"

"But you're-"

"Shh, I'll pick my own name. Call me... Sophie. I like the ring of that."

"No but you are Nancy. You were really self-conscious, so you just took a procedure to give yourself more confidence... I fear it may have affected your brain a bit too much, but don't worry, we can schedule an appointment to revert -at least- the mental changes."

"I'll be honest hon, if I was someone who lacked confidence before, then I don't want to return to being her. I'll respect this 'Nancy's' wishes by being the confident person she wanted, but I don't remember anything about her. For all I know, this is the first day of my life, and I feel amazing! Sorry to Nancy, but I don't want to go when I just got here. Nancy had her time. I'm here now and I think I have the right to exist."

Dr. Fleming let out a huge sigh. "Very well. This was your... rather, Nancy's wish. Be sure to grab your belongings on the way out."

"No need, they aren't mine." Sophie walked out the office door empty handed.

Dr. Fleming sat back down at her desk and began rubbing her forehead. "At least it doesn't seem like she's going to try to sue us, but someone's going to have to teach her the importance of clothes sooner or later."