A mother and two girls have their lives - and bodies - transformed when they try on a new kind of magic underwear.
"All right girls. Today is a big day for you!"
"What's so special about today, mom?" asked the elder of the two daughters.
"I've decided you are old enough to buy your own clothes now," the mother replied as she approached the grand entrance of the shopping mall with her two young daughters. Then she reached into her purse and pulled out three crisp $20 bills. "Now you go and buy yourself something special. And make sure your sister gets something nice too."
"Cool, thanks mom!" said Saki, grabbing the cash with a little too much enthusiasm. A moment later, she was off and up the escalator with her mom waving goodbye, and little sister Miku having to run to keep up with her.
Twenty minutes later, Saki found herself staring longingly at the price tag on a frilly pink brassiere. It was the most beautiful thing she'd seen all day, maybe in her entire life. And she'd always desired in secret to have one. But now that she finally had the cash to buy it, she couldn't help but feel a bit guilty about wasting her mother's money.
Then again, her mom had actually trusted her to buy her own clothes, and that was a sacred trust that could not be broken. Whenever she sent Saki out to buy anything in the past, no matter how small, she had to promise not to waste the money. But keeping this promise was a lot harder than she previously thought now that there was something she desperately wanted to spend the money on.
She could only imagine how angry her mom would be if she spent $30 on a magic bra thing that probably didn't even work. Best not to risk it.
But this was not just any old underwear. According to the tag, it was a Miracle-Fit® Bra, a new brand of lingerie that said it could be worn by any woman, gently enhancing her natural curves.
Its slogan even declared it in big bold letters: Fit for any-body, no matter the size!® And like every other bra in the range, it came with a pair of matching panties, as if the deal wasn't sweet enough already.
The marketing message was clear: Buy me, and you will be slender and pretty and have a great body.
But Saki was smart enough to know that if something seemed too good to be true then it probably was. For one thing, why would an adult-sized garment be able to fit at all on her decidedly child-sized body? If by some miracle it was stretchy enough to accommodate all these sizes (the fabric it was made of didn't feel particularly stretchy), then why did it need to have a size label? She examined the label a little more closely this time: Cup size E.
Saki wasn't old enough to get measured for her bra size, but if she did, she knew it wouldn't be anything close to an E.
With a sad little sigh, she resigned herself to going back to the kids' section to shop with her little sister. But she couldn't bring herself to leave the womenswear empty-handed. What if the label really was correct? After all, it said fit for any-body, not for any-body except children. So where was the harm in trying?
The only thing that was holding back her curiosity at this point was the price tag. She couldn't bring herself to waste her mother's allowance on them. So she was about to put the bra back on the rack and turn away, but not before her eyes were drawn to a brightly colored sticker on top of the underwear rack.
SPECIAL OFFER: Any 3 for the price of 2!
Saki squealed with delight when she saw it because this offer appeared to apply to all Miracle-Fit underwear - plain, fancy, even some bikinis. And this girl just couldn't resist a bargain when she saw one. She couldn't wait to show her mom and sister how much money she'd saved, not to mention how pretty she'd look in her new grown-up underwear.
She remembered at that moment she was supposed to be looking after her sister. That was until she'd been distracted looking at clothes. She hoped that Miku hadn't wandered off by herself. And in a rush, Saki hurried back to find her. While doing so, she picked out a stripy green bikini set in the same size as the bra (those were for herself), and a small girls' set of underwear (those were for Miku). All three products had the Miracle-Fit logo on them, so there was no need to worry about the sizing. Then she ran down the escalator and looked for her sister.
She found Miku a few minutes later in the footwear section, trying on a pair of stiletto heels that were clearly too big for her.
"You can't wear those," Saki said. "They'll hurt your feet."
She had to drag her sister away by the hand from the shoe stand towards the checkout.
"But it's fashion!" Miku moaned.
"It's for adults. You're too young for adult fashion," said Saki, trying to get her to drop the stockings she'd also picked up.
"So are you!"
"At least I'm in the double digits," Saki retorted. Miku merely stuck her tongue out at her. "Come on now, let's get out of here before the store closes."
She rushed to the front of the checkout line and handed over all three $20 bills. The clerk, who was a friendly looking lady with auburn hair, scanned the barcodes one by one.
"Oooh, are these a gift for your momma?" she said, eyeing the pretty pink ones. "I bet you she's gonna love them."
She's going to love me wearing them, Saki thought as she stuffed them discreetly into a shopping bag.
"Hey, what's that?" said Miku, who was only just tall enough to see on top of the checkout counter.
Saki packed the green ones into the same bag without her seeing, but she couldn't stop Miku from peering into the bag afterward.
"Oh cool, a bra," she said. Then after a pause, she said: "I didn't know we were getting presents for mom."
"It's a surprise," said Saki. "You're not allowed to know."
Miku considered about this for a second.
It sounded like a lie, but then again, why would Saki lie to her?
"Yay, I love surprises!"
"Aww," said the clerk. "Such sweet kids."
They continued to talk as they walked out of the store.
"Can I try it on first," Miku said to Saki. "Pweeeeeease!"
"No," said Saki. "It's mom's present. No one gets to try it on first except me."
-
When they got home, Saki was clutching the shopping bag in both hands while Miku was carrying nothing. Her mom bent down to embrace both daughters in order of age. And when she saw, seeing her youngest daughter was empty-handed, she asked:
"Miku dear, what did you spend your money on?"
"I didn't. Saki spent it all."
Their mom's expression quickly changed from a smile to a frown.
"Really? On what?"
"It's a surprise. Show her the surprise, Saki!"
Saki fumbled inside the bag and pulled out the fancy pink set of undies. They looked just as beautiful as when she first found them in the store.
"Actually, I was kind of thinking those would be for me," she said, not daring to look her mother in the eye.
"You mean to say you spent the money all on lingerie? But I gave you 60 dollars!"
"That was all I could afford," she said. "I'm sorry, but they were on a special offer."
"Never mind that," said her mom. "Where are the shirts and socks you had to buy?"
"I bought one for Miku as well..." Saki said in a small voice, even though she knew in her heart that her little sister definitely didn't need one.
Miku fished the small girls' undies out of the bag and screwed up her face in disgust.
"Ew, it's white and pink," said Miku. "I hate pink."
Her mother flared her nostrils. She was normally a very kindly woman who preferred to pamper the girls with treats. But she could have a fiery temper when she needed to, especially when it came to teaching them right from wrong. And this was just one of those occasions.
She laid out the training bra on the floor, along with the green striped bikini and the frilly pink lingerie.
"Let me get this clear," their mother said. "You spent 60 dollars on three sets of underwear?"
Saki was doing anything to avoid looking her mother in the eyes. But she nodded anyway.
"It looks like you only bought what you wanted for yourself," she said. "Did you even ask Miku what she wanted?"
Saki said nothing.
"I didn't think so," their mom continued. "What am I going to do with you, child? That money was supposed to be for both of you! I am so disappointed."
"Yeah!" said Miku, instinctively taking mom's side in this. "You were supposed to let me buy those shoes! You big meanie!"
"That's enough, Miku," their mother said.
Miku spluttered her tongue at her. Saki wanted to curl up into a ball and die of embarrassment.
But this had been what she wanted, wasn't it? She was, at last, a grown-up girl with a bra of her own. Was that not worth the derision from her mom and sister?
But her mom was still talking:
"I don't know what possessed you to buy a thing like this. I mean for god's sake, they don't even fit you."
"Well, the label said they would," Saki said weakly.
Mom picked up one of the underwear sets and examined it.
"It says it fits any-body, no matter the size. But you know that's impossible, right? I hate to break it to you, Saki, but you were ripped off at the shop today. But I think you might be able to return them with the receipt if you didn't..."
"No," Saki said in a small voice.
"What was that?"
"I don't want to! You can take back the other two, but I'm going to keep this one," Saki said, snatching up the frilly pink lingerie and hugging it to her chest.
"But Saki. They're way too big for you."
"I can grow into them. Just you wait!"
"You'll be waiting a very long time for that," mom said while picking up the other two underwear sets. "Now give them here..."
"No. I'm going to try them on right now so you can't take them back."
"Saki, this defiant behavior is going to earn you a punishment."
"I don't care. I like this bra, and I'm going to keep it!"
Then, without shame, she pulled off her tee-shirt, the one with the childish pink hearts on it, and then pulled down her skirt.
"Eeeew, I don't want to see Saki's boobies," said Miku.
"Don't be silly," said their mother. "Your sister doesn't even have boobies."
Saki was humiliated by this remark. Doesn't matter, she thought, at least I've got my own bra.
It was made of lace, with red stitching and a red bow at the front to compliment the pink. The panties were made in the same style, and looked really comfortable too. They were everything she would want in a set of underwear. Such a shame that they weren't made in her size, but Saki didn't care. She threaded her tiny arms into the shoulder straps so the bra hung limply from her shoulders.
Lastly, she disrobed herself of the junior-size panties she usually wore and stepped into the leg holes of the lacy Miracle-Fit panties. They were clearly designed to fit an adult woman and were so loose on her that she had to hold them by the waist just to keep them from falling down.
It must have looked quite pathetic.
"I hope you're happy," said mom. "Because I won't be buying you any clothes now for the next month."
Miku giggled.
Saki realized how stupid she must look. How could she think that wearing a bra made for adults would make her look beautiful? Instead, it made her look like a little girl playing dress-up.
"Don't laugh," she whimpered.
Her mom, taking pity on her, leaned over and fastened the clip behind her back, which only reminded Saki of the fact she didn't know how to do up bras.
Yumika knew her eldest daughter would go through a lot of phases like this one as she made the slow transition to adulthood. She really looked up to the older girls in her school, so it was only natural that she'd want to try on adult clothing.
She knelt down, so she could look Saki in the eye and put a hand on her shoulder.
"Saki, we all know that getting older is a fact of life, but I love you just the way you are. All the best parts of adulthood will come to you in time, I promise. I just don't want you to be miserable in your formative years because of the fact you're still a little girl."
Saki hated being called a little girl.
"Shut up!" she said. "You're just mad at me because I spent your money, even though you told me I could spend it on whatever I like."
"That is not what I said, young lady. I said wanted you to be happy. That does not mean I asked you to be miserable about things you can't control."
"Hey, why is Saki's butt getting bigger?" Miku asked.
"Miku, don't you know it's rude to say that about your sister?"
"But mommy, look!"
Their mother looked at it and gasped.
"Oh my!" she said, and then she made a little crying noise.
"Why, what's happening?" said Saki.
"My baby!" she wailed.
"Seriously mom, what's happening?"
Saki couldn't see it, but she could feel it. There was a pleasant tingling sensation down below, spreading all across her backside and down her lower legs. It was at its strongest where the panties were touching her body.
"She's getting taller as well," said Miku.
"Am I?"
"Saki, dear," said their mom. "I believe you could be having an allergic reaction to the fabric. Either that or... you're entering puberty."
"What's puberty, mommy?" asked Miku.
"It's what happens when little kids grow into adults. It happened to me when I was a girl. And now it's happening to Saki. But good heavens, I didn't think it was possible for it to happen so fast!"
"Cool!"
While they talked, the tingling spread up Saki's tummy and below her knees. Another sensation began on her upper torso and spread out from where the bra made contact with her skin, becoming strongest in two ring-shaped zones around her nipples.
Saki licked her lips and glanced down to see her breasts beginning to bud. In the first few breathtaking seconds, they had grown from mosquito bites into a defined pair of domes, perhaps even big enough to fill up a small bra. But for now they were still growing, and the bra she had on was quite a bit larger than them. Nothing would stop them from growing until they found a perfect fit.
Mom and Miku watched in amazement as Saki's butt cheeks swelled up like two ripe peaches until they loosely fit in the panties she was wearing. There was no longer a struggle to keep holding them up.
The tingling sensation washed over the rest of her body in turn, causing all the little hairs to stand on end. Saki shivered, but she felt warm on the inside as the feeling spread to her hands. She let go of the panties and held both hands up, witnessing her fingers grow long and slender before her eyes.
"How does it feel, sweetie?" asked her mother.
"It feels... nice," Saki said.
She struggled to put these feelings into words as pleasurable shivers washed over every inch of her skin, like something between a massage and a hot bath. There was no better way to describe it, though Saki would later liken it to caterpillar changing into a butterfly in its cocoon. She may not be growing wings, but she was most definitely growing up.
The breasts grew bigger until they were kissing the fabric of her Miracle-Fit bra. Saki had to resist the urge to play with them in front of her family because they were so soft and squishy. Both of her nipples were stiff and pink.
The snug tight fit of the bra made it feel as though someone was hugging her. And the panties also felt like a warm embrace around her lower body as her butt continued to match them for size.
It was the most wonderful thing she had ever experienced, but it was not over yet. Saki arched her back as her midsection exploded in size. So too did her legs, which were adding a lot to her height. She'd grown by at least a foot so far. And by the time she finished growing, she was almost as tall as her mother.
Something else was welling up inside her, pulsing between her legs like a second heartbeat. She knew what it was and hoped it would not bleed, though if it did, ruining a $30 pair of panties would be a small price to pay. The prickling of many new hairs only confirmed it. She had turned into a woman.
"Oh, my goodness..." her mother said when the last few visible changes had finished. "I can't believe what's happened to you. I always knew people puberty affected all of us in different ways, but never like this. Could it have something to do with the underwear?"
"I don't know," said Saki. "When it said fit for any-body, I thought maybe they were magic and they'd change size to fit me. But it's actually the other way round. They made me bigger to fit themselves! Oh wow, and my voice changed too! I sound so mature. This is incredible!"
Saki ran a hand along the entire curve of her hips, then jumped for joy.
Her mom and sister could see that not only had her voice changed. Her face and posture had grown up too. Gone were the features of the happy child they once knew. And in her place stood a newly made and confident young woman.
"I can't believe I was so wrong about that bra and panties," said mom. "They're worth every cent you paid if it means I get to see..." She sniveled. "My little girl, all grown up! And she's beautiful. I think this might be the happiest day of my life!"
"Aw mom, do you really think I'm pretty?"
"Take a good look at yourself," she said, gesturing at the full-length mirror in the hallway.
Saki lumbered over to the mirror, struggling a little at first. She wasn't used to having legs this long.
When she saw her reflection, she had to stifle a scream.
"Oh, wooow!" she said. "I look like a teenage model!"
"You're a little older than teenage," her mom said with a sly smile. "I'd say you're more like a full-grown woman of 20."
Originally posted to DeviantArt in August 2018.
Based on a series of pictures that Pixiv user Mogmog (gomyugomyu) made a while back. Some people - myself included - wanted to see a story version that went along with them. So here it is. Images used with his permission.
Note that this is not a translation of the Japanese short story he posted on Pixiv. It is its own separate thing. As such the character names and backgrounds are a little different from the ones he used.
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