A mother and two girls have their lives - and bodies - transformed when they try on a new kind of magic underwear.
Saki had always been very mature for her age, but this was something else entirely.
"I am so very proud of you," Yumika continued. "Now you come here and give your mom a big hug."
As the women embraced, the older of the two noticed she no longer had to bend down to hug her daughter, a realization that made her feel both happy and sad in a complicated way.
"You don't think maybe they're a little too big?" said Saki, gesturing at her boobs. They sort of get in the way of us hugging."
"Oh, Saki. There is not a woman alive who wouldn't change at least one thing about her body. But yours are the perfect size. In fact, I'd kill to have boobs like yours, maybe even a little bigger."
"Thanks, mom."
And Saki kissed her mother on the cheek.
"Hey, I wanna have boobies too!" said Miku, feeling left out of the discussion.
The two women looked down to see a jealous scowl on the young girl's face.
Her mom only considered it for a moment before deciding if she allowed it for one, it was only fair to allow it for both of them. Then she picked up the green striped bikini and offered it out to Miku.
"Why don't you take these?" she said. "They're about the same size as the ones Saki is wearing. Maybe you'll change too if you put them on."
"Aw, but I kinda wanted those for, uh... myself," said Saki.
"Well, you should have thought about that when I said the spending money was for both of you," said the older woman, immediately snapping back into parent mode. "It's only fair that your little sister gets a turn."
"Urgh, you ruin everything!" said Saki who, despite being all grown up, was not above a little bit of sibling rivalry.
"Come on now," said mother. "If you're going to be a full grown adult, I expect you see you start acting like one."
Saki nodded reluctantly.
"Okay, quiet please!" said Miku. "I'm going to do the puberty thing. Everybody look at me!"
"We're watching," said mom. "Go on, sweetie."
"All righty then!" Miku said.
She lifted her yellow tee shirt over her head, shivered a little, and threw it on the floor. Then she picked up and fumbled to put on the bikini top.
Saki realized that her sister didn't actually know how to fasten up a bikini as all she'd ever worn was one-piece swimsuits. It was quite different from doing up a bra. As a younger girl, she could have reveled in her little sister's inability to dress herself, but she didn't much feel like it today. There wasn't a word to describe how she was feeling, except perhaps... mature. And that was when she did the strangest thing - she bent down and helped her little sister tie it up, making sure it fitted very loosely around Miku's back to give the girl plenty of room for growing into it.
She mussed up the girl's hair one more time, knowing that her little sister might never be this little again. Then she put her hand upon Miku's shoulder and said:
"No matter how big you get, I'll still always be your sister, okay. We're family, and those bonds last a lifetime."
Saki didn't know what internally motivated her to say this, but it just felt like the right thing to say. She had never normally been this patient with her sister, but she chalked it up to her new-found maturity.
Besides, her mother was right. If she was an adult, it was time to start acting like one. But it wasn't just that. Being an adult meant having a bigger brain than before, giving her the ability to actually think like one.
"Whoopee!" said Miku as she over-enthusiastically tore off her frilly green skirt. "Now watch me grow!"
She whipped off her panties and pulled on the striped bikini bottoms, which looked absolutely enormous on her.
Her mom bent down and kissed her on the shoulder. Saki felt jealous again. Why hadn't she been kissed before her transformation? But again, she forced those feelings aside. It was too late for childhood squabbles now. She had literally outgrown them, and soon her sister would as well. Their relationship would have to grow with them. So she decided just to be happy for Miku's sake. That's was what sisters are for.
"Teehee, it tickles!" Miku laughed as the sensations flowed over her tiny body, just like they had done with Saki.
At once her slight frame began to elongate, her once-small torso started shifting into adult-like proportions.
"Oh wow, they're growing already!" she said.
The next and most noticeable change was on her chest. She squealed with delight as the skin stretched and shaped itself into two soft round lumps. Within another 10 seconds, they had developed into passably adult-size mammaries, while the rest of her body was not far behind.
Miku positively shot up in height as her legs extended her skyward. At the same time, the slim hips of a child practically exploded into child-bearing hips. Miku let out a playful giggle as her butt cheeks ballooned outwards, pulling the bikini fabric taut. They looked so big and bouncy that she tried to check out her rear end, but stumbled and nearly fell over because she wasn't used to having such long legs. And still, they continued to lengthen as her height soared past five feet.
The hairs on her arms stood on end as they too extended in proportion with her legs. Soon they were fully grown arms, with big hands and long, elegant fingers. Neither she nor Saki could believe it was happening so fast.
Before the growth spurt ended, she could tell she was going to be as tall as her sister, which made her feel happy inside.
Her breasts were not finished expanding either. The tingly feeling in her nipples reached the peak of its intensity as they continued to swell, turning a deep crimson red in the process, and pressing firmly against the inside of her bikini top like a slow-motion kiss.
Miku jiggled a boob with one hand. She could feel how much heavier her chest had become. It was a bit like having lead weights on her body, but the muscles in her back had grown stronger. So she found she could carry them without that much effort.
Her new body it seemed was incredible: big boobs, long legs, and positively surging with adult strength. She was powerful, even though she was probably only average for a young adult woman. Moreover, she felt powerful. Plus, her boobs were way bigger than average, and about the same size as Saki's.
"Whoopee, we're twinsies!!" screamed Miku when the transformation was done. "Oooh wow, and my voice changed too, did you hear that?" She threw an arm around her formerly bigger sister, and couldn't stop smiling and laughing.
Saki wasn't quite sure how to respond to this. For a few moments, she had enjoyed being the only member of her family this tall and beautiful. But now she had to share the spotlight with her formerly little sister, who was now her equal in both height and looks.
Her instinct toward sibling jealousy came back, worse than ever, but as soon as she looked upon the innocent smile on her sister's face, flushed red cheeks and shiny brown eyes, those feelings simply melted away. When she looked closer, she could see actual tears of happiness in those eyes.
Having gone through the same process just a few minutes ago, Saki knew how right and wonderful it felt to be an adult for the first time. She couldn't bring herself to ruin the moment for someone else, even if it was Miku.
Instead, she put her other arm around her sister, no longer little, and the two women embraced for the first time as twins, giggling a little when their boobs touched.
Without another word, they walked over to the mirror together. Miku found it a little harder to walk with her new legs because she'd changed so much in relation to her previous size. But Saki was sure she would pick it up fast.
"Wow," she said, touching the glass, unable to truly believe it was her own reflection staring back at her. "We look so pretty."
Saki noted her use of the word 'we.'
"Yeah, it's so cool! Of course, I always knew we'd look this good when we grew up."
At that point, Saki caught sight of their mom's reflection. She was standing behind her two daughters, and crying.
"What's wrong, mom?" asked Miku.
"It's nothing, my dear. You just look so grown-up and wonderful, it makes me want to cry! Oh! And you just called me mom."
"Mommy...?" Miku began, but the word sounded strange coming from a grown woman's mouth.
"No no, it's fine," she said through tears. "I guess I'm just 'mom' to you now. But you know how emotional it is when your baby girl stops calling you mommy. It means there are no more little girls in the family, and that makes me sad. But growing up can also be a beautiful, wonderful thing. And I'm just so happy that it's made you happy. Seeing my two daughters become adults on the same day is just... it's the best ever gift a mother could ask for!"
She choked up again. Saki put a hand on her shoulder before pulling her mom into a big hug. Miku followed suit, and soon all three of them were hugging.
"If you like, we can change back," Saki said afterward. "Although I'm not sure how to do that with these things. Maybe if we put on the little ones...?"
"Hey, look at this," said Miku, pointing a finger.
"Ew, Miku, you're staring at my butt!"
"No, silly!" she said, pointing to the label sticking way out of her panties. "Maybe the label can tell us."
"Oh right, the label," said Saki, blushing a little.
"Also, you have a nice butt." Miku giggled.
"Thanks. Yours is pretty nice too." They both giggled.
Miku bent down and read from the label.
"For temporary usage only. Body will revert to previous size when taken off. Machine washable."
"So," said their mother. "It looks like you're only women when you are wearing women's clothes, and only these particular ones."
"I guess that means we can change back any time you want. Isn't that cool?" said Saki.
"No!" said Miku. "I wanna have fun as a grown-up!"
"It depends on what mom wants us to do," said Saki. "Right mom?"
"Oh no, Miku is right," said their mom. "I would never ask you to change who you are just to please me. Your bodies are a very personal thing to you, and you have the right to choose to be whatever you wish to be. Whether that be a child or an adult, I'll always love you just the same."
Saki smiled. She too had a tear in her eye.
"Thanks, mom."
"Anyway. I can't wait to show dad what's happened to us," said Miku.
"He won't be able to tell which of us is which," said Saki.
That was a good point. Other than their hairstyles, the two sisters looked very much alike.
"We should make him try really hard to guess," said Miku, rubbing her hands and grinning.
"Hey, I'll show you how to do your hair like mine," said Saki. "That way it'll be even harder for him to tell."
"Ooh, yay! That's a good idea."
At this point, their mom took a nervous glance toward the phone.
"Speak of the devil," she said. "I think there's a message from him now."
She walked over pressed a button on the receiver, and their father's muffled voice came out of the answering machine.
"Yumika, honey, how have things been today? I have just been having such a hectic time at work, you know? I think I might stay in the city for another hour or two just to unwind. But be sure to leave leftovers of whatever you're cooking, okay? Oh, and say hi to the girls from me. I probably won't be home tonight until after their bedtime. Anyway, I hope you had a great time shopping with them. If you bought something nice, then tell them it's from me. Okay babe, love you so very much. *Mwuh!* Bye."
Their mother pushed a button on the phone and the message was deleted.
"How typical of your father to work late on a Sunday!" Yumika said to her daughters. "He goes and hangs out in a sleazy bar with his business associates instead of spending time here with his family."
"You're not still thinking about him now, are you, are you?" said Saki.
"I know, I know," said mom. "On one hand, I can be such a Debbie Downer. But on the other hand, he's never around with us during the week. And now he's actively avoiding his family on the weekends too. It's a shame that he didn't get to watch you growing up today. And if he tells me he's missed out on the best years of your lives then, well, he only has himself to blame!"
Yumika let out a fiery sigh and paced up and down the room.
Their mother's mood was contagious. Saki and Miku had been overjoyed a few minutes ago, but a simple voice message from their father had brought them down to reality.
"At least he still gives us money," said Miku.
"Actually," said their mother, "those 60 dollars I gave you were all we had left in the shared bank account this month. Everything else is in his private trust funds."
"That's awful!" said Saki with a gasp. "I had no idea it was the last of your money. If I knew, I would've been more careful about spending it. Why didn't you tell us?"
"I didn't want you to feel bad about it," Yumika admitted. "It's not your fault we don't have enough money. But I figure that since you're adults now, you can stand to learn these truths."
That brought a smile back to Saki's face. She very much enjoyed being treated like an adult.
"Still though, it's not fair he earns so much and doesn't give more to us."
"Well, to be fair, we both have our own jobs," said Yumika.
Yumika didn't mention however that she'd taken a low-paid catering job that only ran during school hours, specifically because their father had entrusted her with the daycare needs, rather than pay for a nanny.
"Hey, I've just had an idea," Miku said excitedly. "Now that we're adults we can get jobs too, and share the money! I'm in if you're in." She looked at her sister, who nodded enthusiastically.
"Yeah!" said Saki. "And hey, I've just had another idea." She bent down and picked up the last pair of Miracle-fit underwear. "Why don't put these on, mom? That way we still get to have a little girl in the family. And Miku and I can work jobs to support us. We'll make loads more cash if it's two adults supporting one child. You could even go back to school if you wanted."
Saki extended her arm to her mother who took the children's undies in her hand and examined them.
"I never really thought about that," said Yumika. "But I don't think the education in this country system is any good. So I'd rather not go to school."
Saki nodded.
"Aww, but you'd look so cute as a kid," said Miku.
Their mother suppressed a chuckle.
"Thanks, Miku, but it's honestly not for me."
She passed the child-sized undies to Miku, who stuffed them back into the shopping bag.
"Do keep them around for something else though. I think I might be able to find a use for them. And by the way, do you know what time that store closes?"
Saki shrugged her shoulders, unsure of why they had to go there twice in one day.
"I think it's open till 9," said Miku.
"Perfect," said Yumika, pulling the last fifty from her wallet. "Because I'm going to go there now to see if they have something else a little more in... my size."
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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