Yui dreamed again that night, and again the images and sounds – whilst being totally clear in her mind during the night – faded away in the morning. All she was left with was images of her with humongous, colossal breasts, arching down towards the floor, impossibly big. Also was she…? No, that couldn’t be-

“Breakfast!” Came the call from downstairs, rousing Yui from her slumber. She yawned and stretched, her bones cracking as the morning light streamed through the window. Thank god, she was hungry. Yui sat up, slipped her legs out of bed, and went to stand up. As she did she looked down at her chest, and gasped. Those tits from last night, the ones she’d seen as bigger and bouncy on her chest were still there. What with the dream she was feeling confused and discombobulated about what was real and what was fake, but here they were, perky and round on her chest, stretching her PJs a little, pulling at the buttons.

She loved the sense of scale and size on her body, even though they were tiny compared to all her friends’ boobs. On her slim, slender frame, and at her 5’7 height, they looked great. She’d even need to buy a new bra!

Yui bounced across the carpet, her tits jiggling as she moved, and slipped on her largest bra – a 30B that she’d bought once in a bout of extreme optimism and wish fulfilment. She placed the cups over her new boobs, and smiled as they only just fit. A fair portion of tit bulged over the top. Her heart began to pound as she clasped the bra around the back, and she could barely do up the clasps. Her breasts bulged up, as if she was wearing a pushup bra. She loved how it looked.

Yui slid a t-shirt over the top, loving the snug sensation over her tits, put on some jeans and bounded downstairs for breakfast, her boobs shaking and wobbling as she went.

She was absolutely ravenous, so wolfed down a plate of pancakes and bacon, with lashings of maple syrup, slurped down a big mug of coffee, and asked for seconds. Her mom, who always wanted her to keep her strength up, was happy to oblige. Yui patted her full stomach, which was showing above the lip of her jeans, and headed into town. It was time for the trip she was afraid she’d never get a chance to make: bra shopping.

Yui bent down into her car, bumping her head slightly on the roof as she got in, and adjusted the seat until she was comfortable. She looked down at her new breasts, bulging out of the bra and stretching her t-shirt, and felt her nipples harden. This was good. This was very good.

She pulled out into the street, her boobs jiggling beautifully as her car moved, and roared off to the mall. She placed her sunglasses down over her eyes, as the bright light hit, and turned the music up loud. This was going to be good.

**

“30D?!” She cried, as the store assistant finished measuring her bloated breasts, placing the tape away and smiling.

“Yep. It’s a very common size, even for someone with your slim frame.”

The smiling woman brought some samples into the changing room as Yui cupped her sizeable new breasts with amazement and delight. They felt so fulsome in her hands, so sensitive to the touch. And so big. She loved it, every moment of it.

“I don’t think you’ll need padded bras any more, not unless you want to look huge.” The shop assistant smiled, handing Yui a selection of large-looking bras that Yui still couldn’t believe were for her. They were far too big! But as she placed the cups over her boobs, she was shocked and delighted to see that they were more often than not just the right size for her swollen new mams. Indeed, some of them were even a little snug, which sent a pulse of arousal through Yui’s body. It was the same arousal she’d felt when the assistant said “unless you want to look huge”, with the emphasis on the huge. That made Yui feel very funny inside. There were some feelings being brought to the fore that she had not anticipated.

She eventually decided upon three bras: one slinky black number which supported her new girls and showed off their size and shape, and two solid, white, modest bras that wouldn’t show through her school blouse and would hopefully conceal a little of her swelling to the rest of the school. She knew people were going to know – anyone with a passing interest in boobs would see her rapid sprouting and be very much aware that they had rapidly changed size. But that was fine – she had spent much of her late teenage life staring at large breasts – she was just grateful that she could be a part of that club, if only in a small way.

Yui practically bounced out of the store, wearing the sexy black bra which clasped her swollen twins like a hug. Profoundly erotic thoughts whirred through her brain. Something was happening to her. And she liked it.

**

An hour later, she was treating herself to a large ice cream in the food court when she bumped into Andi, who was out shopping for sportwear. Andi was a cheerleader, and as one of the more modestly-breasted of their crew, was able – with the help of a fairly robust sports bra – to hold her generous chest in place enough to be an indispensable member of the squad.

She ran over to Yui, her tits jiggling in her tight tee, and hugged her close. Immediately Yui felt their breasts bulge into one another, and she felt a tightening in her stomach. Her boobs were so big, they were pressing into other people! It was too much!

“Hey girl, you look…good.” Andi managed, checking out Yui’s rack with an appreciative look. “Are your boobs…?”

“I think so!” Yui burst out before Andi could finish. She giggled cutely, shaking her new bust back and forth, causing a jiggle under her shirt. “I didn’t want to jinx it the other day, but they’re definitely bigger!”

“Wow, that’s great!” Andi smiled, almost to herself. Yui caught the expression for just a moment, but couldn’t quite parse it. “I’m really pleased for you. You’ll be bigger than me at this rate!”

Yui blushed, and looked down at her boobs. Her heart was pounding hard in her chest at the thought.

**

Yui got home, after adjusting her seat in the car again, and headed inside for dinner. She was hungry again.

“You look nice, darling.” Yui’s mom Nancy smiled. “Good day at the mall?”

“Yeah, bumped into Andi while I was there; she says hi.”

“Such a nice girl.” Nancy grinned, placing a large bowl of noodles in front of her daughter. “Eat up, plenty more where that came from.”

Yui did. She had seconds. Then thirds. She was hungry.

**

Stepping into her room, Yui belched humongously – long, loud and satisfyingly, and patted her stomach. It was exposed more than usual, and Yui assumed – as she walked across to the mirror – that it was because it was full of food. But when she got to the mirror, she gasped. It wasn’t that her stomach was larger…her breasts had grown. Again.

Yui looked down at her boobs, and immediately could see by their large, swollen profile in the mirror that that had enlarged. They were around the size of large oranges before, happily tucked her black bra, but now they were an inch or so larger again, curving out of her bra and pulling her t-shirt tighter than they’d ever done before.

Yui gasped, lifting her shirt up over boobs (which wasn’t easy) and examined her engorged boobs. They were perky and round and spilling over the top of her bra – this couldn’t be! It fit perfectly this morning! What was happening?

Yui removed her t-shirt over her head, and stared at her swollen breasts in the mirror. They hung out across her like grapefruits, proud and pert and pouring over the cups of her bra, which was digging in once again to her back. She frowned, reaching behind to unclasp it. Before she could undo the second clasp, it pinged off and the bra fell to the floor, revealing Yui’s new tits in all their glory. She felt a little weak at the knees. On her slim frame, they looked great. She had to duck her head a little to see them properly in the mirror, but holy shit she looked hot. She rushed over to her bags and pulled out one of her comfortable white bras for school. She slipped it on, but it was immediately clear that this wasn’t the right size either.

Had the shop assistant made a mistake? Yui thought this most unlikely, but found the alternative so arousing it almost made her go and pleasure herself then and there. Were her breasts actually growing? It was too much. Yui went to bed, mind racing 100 miles a minute, and fell asleep, the heavy weight on her chest rising up and down as her breathing became regular as she fell asleep.

**

The next morning, Yui had a real shock. She’s bought some new blouses for school, knowing that her new rack would have looked positively pornographic stuffed into her old clothes, but there had been other changes that she had not realised – changes that her uniform was making clear.

Whilst her large new blouses that she’d bought were already far more snug that she would have liked, Yui was more struck by just how short her skirt had become. Maybe it had shrunk in the wash, but for whatever reason it only just covered her butt, and revealed a whole lot of her slim, toned legs. She was really not sure if she’d get away with having this much of her on display, but she figured that given there was a lot more of her in general, she’d better get used to it.

She squeezed her tits into her old bra, but by now she was convinced they were expanding, as to wear it was quite a struggle. She could already feel the clasps groaning to try and stay done up, and her tight button blouse was beginning to part in key areas as her swelling balloons gradually stretched larger. It was very hard to track, given just how subtle the growth was, but Yui was determined to use her top as a marker throughout the day.

She drove into school, her shoes not fitting well and her skirt very short, and tried to go about her day as normally as she could. This proved easier said than done, as her new short skirt and massively swollen mammaries were quite the draw for students and teachers alike. Yui had barely had time herself to process how big she’d gotten, but for people who had last seen her on Friday when she had no tits and a properly fitted skirt this was like someone had taken a pump to their Yui and not stopped inflating until she was fit to burst. She felt a little like that herself as she bounced down the corridor, her fat tits shaking and rippling inside their tight cotton prison. Her top felt like it was really struggling almost immediately, as her bulging boobs made it feel tighter and tighter as the day progressed.

Before class she managed to chat to Andi and borrow one of her bras. Her friend seemed remarkably unsurprised at the request, and even had a couple of spares on had to lend her as Yui cornered her in the changing rooms, accidentally pressing her large breasts into Andi’s, their twin pairs bulging gloriously into one another. Yui made a mental note to speak to her friends, who were all acting oddly at the sight of her tremendous new knockers. Maybe they were jealous about little Yui finally catching up to them? She hoped not, but the darker parts of her mind considered the possibility.

Yui got a new skirt as well, and some new shoes, all of which fit her much more suitably than the micro skirt she’d apparently got from home. She found herself taking up a lot more space in general, and wondered just what was going on. Sure, she had slightly larger breasts, but she found her desk felt too small, and even using computers was a little more difficult. Something was very odd.

It was when she bumped her head on a particularly low doorframe that Yui realised what it was. Maybe her boobs weren’t the only thing that was growing. She was just about to make a measurement on the wall, when she felt a tingling in her chest and her body, and it was like she’d taken a deep breath in – except of course she’d done no such thing.

Her breasts inflated outwards, and the buttons on her blouse – already stretched to their max due to the slow, gradual inflation throughout the day – began to strain and buckle, and the middle one burst outwards, firing off out through the door to the corridor beyond. Yui gasped, covering her mass of exposed cleavage with her books, and hurried to the nearest restroom, her massive tits shaking and wobbling as she did so.

Inside she saw Andi, who was looking at her with a peculiar smile on her face.

“Feeling a bit…full?” She asked, her eyes flicking down to Yui’s very prominent chest.

Yui blushed, flushed with a bit of anger this time, and was about to give her friend a talking to, when Marnie walked in, breasts first, and waved at them both.

“Hey guys, what’s up?” She asked, noting the air of tension in the bathroom. “Oh, and your tits are looking great!” She added, nodding at Yui. Yui smiled back, and was about to leave, when Andi took off her blouse, and handed it to Yui.

“Swap ya. You’re bigger than me now anyway.”

Yui stood in the bathroom, shellshocked, as Andi slipped on Yui’s old blouse – which fitted Andi way better – the remaining buttons much less taut, and left.

After much difficulty, Yui buttoned up Andi’s blouse, which gripped her large breasts incredibly tightly, but just about stayed together, and walked slowly and carefully to her car. By the time she got home, only a few buttons remained unburst, but she’d made it without exposing herself. She rushed up to her room, fell heavily on the bed, and breathed out, her bra exploding off her as soon as she lay down. Yui looked up at her large, wobbling breasts – now much bigger than 32D – that perched atop her chest. Something very strange was going on, and Andi was part of it.

Yui struggled to get her PJ top on, and it just about buttoned up over her engorged boobs. Buttons were very strained. Before she knew it, Yui was asleep, and while she dreamed, her body once again started to tingle…

To BE concluded…