Yui’s dreams were full of scattered images of her friends surrounding her bed, chanting and blowing out candles and urging her to “GROW” in deep voices, and in her dream she had grown, hugely tall and impossibly busty, with breasts that spread down to her belly, impossibly large and full and taut and-

“UNNNNNFFFF” Yui awoke with hands in her pants, her body rocking with a deep and profound orgasm. Luckily she was biting her lip or else her moans would have woken the whole house. She sat up in bed, and noticed a chill on her chest. Looking down, she gasped out loud, to see the huge mounds that lay on her chest. Her boobs had swelled in the night, from the large grapefruits they were the night before to the bountiful melons they were now. These balloon-like breasts bulged from her slim form, and three of the buttons on her blouse were popped already, while the remaining ones looked set to go at any moment. Her tits were huge and heavy, and yet she had no problem carrying them around. What was going on?

Yui arched her back in a stretch, and the remaining buttons on her PJs burst open, the top spreading apart to allow her giant boobs to spread out. They were now far too large to get her hands around, and rested huge and perky on her chest. They looked…incredible.

Immediately Yui leapt out of bed, her tits bouncing, and made to put on her bra – Andi’s one from yesterday. It wouldn’t fit. Nowhere near. She tried squeezing her tits up, but all she got was boob up to her chin. There simply wasn’t enough fabric to hold her boobs in place. It was time to go shopping again. Yui also noticed that she had to significantly lower her head to view it in the mirror, and knew that she had gotten taller. Something was happening to her, and it was no longer just puberty. She made a mark on her closet to measure her height. She was nearly 6 ft.

Putting on some stretchy exercise pants and her loosest t-shirt, shocked at how large her boobs looked in it, Yui squeezed back in her car and made an early trip to the mall. It was time to buy a lot of things.

**

Heads turned over the next few weeks as Yui made debut after debut at school. Every time she thought she’d finished growing, and was confident in starting a new wardrobe, she would inch out again, and all her clothes would look like she was dressing to fuck everyone in sight. It was an exhilarating, and slightly frustrating experience.

The first few days she simply got some larger bras, and some very big blouses, and waited for this growth spurt to ease off. She found that her desk in class was getting a little small, and the taller she became, the more she loomed over it, but even as her butt expanded she just about fit in the standard size chair, and was able to get by. She decided to not sit at the front as much any more, despite her great relationship with the teacher and excellent grades, because she was starting to obstruct people’s ability to view the board.

Her butt was slowly expanding along with the rest of her, so Yui purchased bigger and bigger skirts to cover up her swelling behind. Every week, she had to buy a larger size, as her cheeks inflated over time, soon pushing at the boundaries of decency every time she left the house. It was a challenging experience going to bed with a fully functioning outfit and then waking up to find it no longer cover your capacious ass. But Yui took it all with good grace. And besides, that was nothing compared to what was happening to her breasts.

Yui’s tits initially reached a solid 30G – a little larger than Andi’s – and stayed that way for a few days. It looked like that was it. On her slim, but taller frame, they looked very large, but not comically so, and she was able to use her laptop, fit through doors, eat food normally, participate in sports, and all the things that most reasonably large-breasted women could still do. That was all fine.

Then, a few days later, after she’d had a conversation with Andi about how they were basically the same size these days, Yui had felt her breasts start to swell again. She began to notice the warning signs – a slight sweating, a tingling in her body, localised often to her chest. And then, sometime after that, she would notice that her bra no longer fit, or that one of her buttons was fit to burst, or that she’d simply gained an inch in height. It wasn’t often that she actually saw it happen – though those moments were wonderful – but she knew once it had happened.

She became accustomed to her tops being perpetually tight, not matter in what state she left the house. She generally lost a button or two a day, and people around school became accustomed to her displaying a canyon of cleavage by the end of the day, no matter how much she tried to hide it. She purchased a huge variety of blouses and bras in increasingly huge sizes, and stashed them at various safety points around the school, so when her boobs began to swell in the middle of an exam, and started to bulge into the desk and strain her shirt until it untucked itself from her skirt, then she added a couple of inches in height and nearly broke the chair, she was able to be excused to go to the restroom and come back a little sheepish, ducking under the door frame (she was about 6’6 now), and with tremendously large breasts wobbling and swaying, but still with her sense of decency intact.

Her breasts by this stage were about the size of her head, and swelling larger every day. As the days passed, they loomed further down towards her belly button, getting heavier and wider with every burst of growth. She also grew taller, her body shooting up and up as she consumed mountains of food (Yui didn’t notice it, she just thought she was hungry). She now had to duck under doors regularly, and in some rooms had to lower her head a little to fit. She was taking up a huge amount of space now, in so many ways. She’d taken to swimming when she had time, given the space she had in the pool when no one was there, and also the stretchiness of swimming costumes that meant she didn’t have to buy a new one every week, she just purchased one huge one that she was only gradually become too large for.

She saw her friends, from time to time, but because she suspected Andi of foul play, and didn’t know how much the others knew, there were times when she ignored them. Also there were times when one of them was trying to talk to her and her breasts simply blocked them out. Even though all of them were busty, they certainly weren’t all tall, and when your breasts jut out ten inches in front of you, it’s easy to miss things.

Yui was by and large in her own personal heaven though, as her body continued to do exactly the thing she’d always wished it would do. Her boobs were now so huge they were wider than she was, and unless in a very supportive bra, they bulged down to her belly button. She was bigger than Jessa, Marnie and Mary, and only slightly smaller than Simone. And it wasn’t going to be long until she overtook. She could see them looking at her boobs with confusion and delight, and even though she was in a complete whirl about what was going on, she did still see her friends. They were largely too polite to talk about it, but sometimes she saw looks that seemed loaded. Then a button would burst or a seam would tear and Yui would have to wobble off to get a new bra or a new top, before she exposed her gigantic mounds to the world.

Academic work was getting harder. She had to put books up on a stand in front of her, because if she rested them on her desk, they had to be so far away to avoid being smothered by her boobs, that she couldn’t really read the writing. At home she only wore a vest top and little hot pants, because she was sick of losing buttons at school, and she wanted something very flexible to contain her boobs.

They continued to grow a little every day, stretching and bulging and swelling larger and larger, and were soon approaching her hips. They were starting to take up all the space in front of her, and it was only the fact that she kept growing taller that kept them in any kind of proportion whatsoever. The fact was that she was becoming more and more like a walking cartoon. A walking cartoon that was having a bit of trouble dealing with the everyday challenges of having such a physique.

Yui was growing to love double doors, because it meant she wouldn’t have to squeeze through. Single doors were starting to present a problem, because her boobs were now so wide they couldn’t always fit. And if someone was coming the other way, forget about it. She found being so large and being so stared at by the entire school profoundly arousing, and would often have to squeeze into a bathroom stall at lunch and quickly pleasure herself to calm things down. Of course, the fact that these stalls were such a squeeze only made her more aroused, so it didn’t solve her problems for long. Something about being too big to fit into spaces really turned Yui the fuck on, and the more she grew, the more sexual she became. She felt more powerful by the day.

It was when her breasts reached down to her hips, and made most doorways a real challenge, that Andi first said something. Yui had been ignoring her for a while, but one day they sat down together at lunch, Yui shovelling three meals into her mouth, and Andi started to speak.

“Um, Yui…we need to talk.”

“Mmmfff, mmfmuh?”

“Ok, you carry on eating, but there’s something I need to tell you. I…uh, for your birthday, a few weeks ago, I bought you some…pills. They were supposed to make your breasts grow to like a DD-cup, max, but clearly there’s been some mistake, and I checked the symptoms for overdose and it’s not going to kill you or anything, but god your tits…”

Yui swallowed a huge mouthful of burger, belched appreciatively, took a big slug of soda, and replied.

“I like ‘em.”

Andi practically gaped.

“Y-you do? That big?”

Yui nodded. “I’ve always wanted huge boobs. I had assumed I had a limit to how big ‘huge’ meant, but it really doesn’t look like it. Whatever you did, I’m into it.”

Andi looked like the weight of the world had been lifted off her shoulders.

“Oh thank fuck, because I really was worried I’d ruined your life, and-“

Yui waved her away, just as Marnie, Mary, Jessa and Simone sat down. They all had very serious looks on their faces.

“Umm, we’ve been meaning to talk to you-“ Simone began

“We’ve all come to realise we may have made a slight mistake, and that’s why you’re…” She poked one of Yui’s beach ball sized boobs, which wobbled slightly in it skin-tight cotton prison, the gaps between buttons growing dangerously large with each passing second. Yui knew the warning signs, but she was too hungry to care. Her breasts took up most of the table, food plates scattered to either side.

“Yeah”, continued Mary “Um, I thought it would be a good idea on your birthday, given how bummed you were about your boobs-“

At this point Yui tingled, shot up an inch in height, and her breasts groaned forwards. The middle button on her blouse strained even tighter. It was like a champagne cork ready to blow.

The women all eyed the buttons like a bomb about to go off, looking up at the towering beauty in front of them, who was well over 7ft now, and had breasts like over-inflated water balloons, sloshingly large and magnificent and ready to burst.

“So…”, said Marnie, “I…well, I suppose we gave you a pill to increase your breast size, but…we all came to the idea individually – as a surprise, you see…”

Yui belched hugely, her breasts rumbling and shaking as she did so. She stuffed a huge portion of fries into her mouth, and her breasts heaved outwards. One of the buttons was on its last legs. Her tits were beyond description. She loomed taller.

“Look, we all gave you the pills”, Jessa rushed out, desperate to confess. “That day when you had lunch with each of us, Monday to Friday? We all individually had the idea to buy you some of these experimental breast growth pills, but because it was a surprise, no one told anyone, and we all gave you a load, and the effect compounds, and no one’s wanted to say anything, and now you look like…”

She gestured to the gigantic, pumped up sex goddess in front of her.

Yui smiled, and one of her buttons fired off like a bullet across the canteen. A giant mass of cleavage appeared. You could get lost in there.

“Oooof, I think I’m gonna grow again.” She muttered, taking another handful of fries, smothering them in ketchup and shoving them in her mouth.

“And…we’re really sorry.” Said Simone, looking down, unable to meet Yui’s gaze.

“Sorry?? SORRY??” Yui’s eyes were wide and bulging. “Sorry?!?! This is the greatest thing that’s ever happened to me! Look at me!”

People around the canteen were staring, and they could actually see Yui grow, actually see her add another inch to her height, as her skirt rode up her legs, and her breasts ballooned outwards once again, now taking up the entirety of the table. They almost reached the women opposite.

“I had no idea it was you – if I did, I’d have thanked you!” She cried, leaning forwards onto her boobs, bursting three buttons in the process and reaching out to her friends.

They all visibly sagged with relief, desperately pleased they hadn’t destroyed their friend’s life.

“Sure, it’s harder to do certain things, like sleep on my back and walk through doors. But look at me! I’m incredible!”

The women had to agree with that statement.

“So…no hard feelings? Because there might be more growth to come.”

Yui arched her back, taking down the remaining buttons. Her boobs were barely covered by the remnants of her blouse.

“Bring it. The Fuck. On.”

Several people in the canteen fainted.

**

It was only a few days later when Yui’s growth finally stopped, but in the last few days it really accelerated before it slowed. Yui had been getting taller and taller, so much so that she had to get a new bed, and move to the attic room in her house which had lots more space for the growing girl.

By the time she was done with height, she had reached just over 8 ft. She was a giant, the tallest person anyone in her town had ever met. She was colossal. Everything she wore had to be tailor made, and her body was the object of desire for miles around.

As for her breasts, they stopped growing the same day, but they had reached frankly ridiculous proportions before they eventually came to rest. They swelled larger and larger, fuelled by ever greater portions of food that Yui ate, and before long they had reached down from her hips, and began to cover her pussy. But they didn’t stop there. Her supply of tops began to run dry at school, so she got a huge number tailor made, out of all sorts of space age materials that could handle something so heavy and fulsome as her twin balloons. She had to start using special doors in the school – even doubles were a squeeze – as her breasts were simply too wide to be allowed. They stretched about a foot either side, and were beyond belief. They rested just shy of dragging along the floor when supported, and stretched the entire length of her 8ft body, until just below her chin.

Her bras were miracles of engineering, capable of containing and supporting the tremendous tits she now possessed. Given her height and the apparent muscle mass she gained from her inadvertent course of pills, she was able to carry them with ease, but doing anything remotely normal became an interesting (and often arousing) challenge.

Her tits took up entire couches when she sat on them, so she usually allowed her boobs to drape across the floor like enormous beanbags. She preferred the summer when everyone could be outside, as there were a lot of houses she simply couldn’t fit in any more. Showering was a challenge – she needed a long hose to a.) reach all of her boobs, and because b.) she couldn’t get inside any home showers. The large school locker room ones were fine, though she wasn’t able to share with many people.

She could leave a lot of things on her boobs, like the TV remote, or dinner, and she would often forget it was there, like when you leave you bag on top of your car and drive away, so she was often knocking things over that way (not to mention just by walking into them) and losing things in her cleavage. That was a real problem, as there was just so much boob that things could get stuck between them and never get out. She swore that was where a couple of her ex-boyfriends were, but then – why would they ever want to leave?

She could still go on dates, and wear nice evening dresses, though they required special tailoring, and were more like tents than anything, in terms of volume of material. But there was a lot of curve to work with, and Yui found she could make it work.

Plus she had her team of 5 besties, who, because of the kind thing they all tried to do for their friend, were more closely bonded than ever. Sure, schoolwork was tough – she couldn’t use a desktop computer unless it had a wireless keyboard that she could try and balance on top of her boobs, and even then it was awkward – but they made it work.

And for Yui – who had long ago thought her life was as good as it was going to get – things were finally as they should be. They were pretty much perfect. She might take a couple more pills in the future, but that was for another day. For now, things were perfect. Well, almost perfect.