"Big sis, what's your idea?"
"You'll see very soon, Misuzu, now stop dawdling along and walk with us to the living room" you said as you gave her a slight push "I'm sure you'll enjoy it"
After all of the girls had taken place on the sofas and beanbag chairs, most of them still chatting about their day on school, it was time for the show to start
"Okay girls, may I ask you to close your eyes for a while. Don't peek or I'll kill you!" you joked
"Not one of these games again.." Matsuri complained. Being in mid-puberty, she thought she was too old for these kind of games.
You sighed and said: "Matsuri... Just close your eyes, okay?" As if by magic (it was in fact magic), she closed her eyes without complaining anymore.
In your mind, you had been making a design for a size-changing gun, and then, again as if by magic, there it was. In your hands. It looked quite a lot like a futuristic kind of gun, except for the fact that it had an interface like a remote control at the top. After switching it on, all the icons started glowing and it asked for the target's name. This is where the really cool stuff started: The gun was controlled by the holder's mind. So, after thinking of yourself, the device automatically entered Nayuki. Then, above the back of the gun, a small, but incredibly accurate 3D hologram of you showed up. It wore the same clothes as you, had her hair in the same You could zoom in, turn, change angle, etc. all by your mind. After setting it to expand your breasts at 3 cup sizes per minute, the breast icon started glowing in a green color, and so did the hologram's breasts. Afterwards, it immediately asked "Grow clothes as well?". You answered no (again, with your mind)
As a prank, you held the gun to your head, as if you were wanting to commit suicide. You made the hologram and user interface invisible for the girls
"Okay, you can open your eyes again!"
The girls reacted differently to the sight of the gun. Kyoko just screamed, covered her ears and twisted her head away, while Misuzu shouted: "NOOO!" and ran off to the corner of the room, afraid to be shot herself and Aoi and Matsuri were staring at you with their mouths half-open.
Kotori was the only one who tried to stop you. "Nayuki, you don't know what you're doing. It would be a waste to end your life so soon. Drop the gun. Do it for yourself, not for me"
"You guys don't know how it feels like to be small and tiny like me. To be made fun of by Akane and her 'friends' To be surrounded by all these breasts while being flat-chested yourself. To not have the slightest chance of getting a boyfriend. That's why I'm doing this"
[Character introduction; originally written by Commando]
Akane was probably the most dangerous girl in school. She wasn't a championship boxer or some homicidal psychopath, but she had plenty of ways of making life a misery if she didn't like you. Vindictive, spiteful and manipulative; what made her truly dangerous was her body. Standing at 5'11" she packed flawless curves, an incredible ass and a stunning pair of G-cups. She seduced or intimidated her way to whatever or whoever she wanted; the boys liked her sexy and the girls were scared to make her angry - even the teachers steered clear of Akane.
"Nayuki... Don't you see that all that matters is the inside. Only boys you don't want to have as boyfriends rate beauty by the outside. Real boys rate it by the inside" Kotori said. She was able to stay calm even in situations like this, which was a remarkable, and incredibly helpful characteristic.
"Ha, I got you all didn't I? This gun is fake. There are no bullets" Everyone sighed as they heard this, even Misuzu, who was now standing in the corner of the room. You lowered the gun, but instead of dropping it to the ground, you aimed it at your breasts and pulled the trigger. The gun didn't have the typical banging sound, so you quickly added it this time. Again the whole room was shocked. Misuzu was just about to scream again as she, together with the other girls, realized that it was not an ordinary gun. You turned the display back on, and it showed how long your breasts had been growing and their progress towards the next cup size. A green, sci-fi - ish, electrical pulse went from the loophole of the gun to your breasts, which were now glowing green as well.
"Nayuki... May I ask you....what kind of gun that is?" ,Matsuri asked, "And how did you get it?"
"Oh, just a size-changing gun, that's all. The answer to your next question is a bit bigger, but I'll say it anyway", you said, still holding down the trigger, "This morning, a genie appeared in the attic, and he granted me a wish. I wished for the power to change reality. And with that power, I made this"
"So you can change anything you want now? You could even destroy the entire world in the blink of an eye?"
"Yep, that's right. But I'm not that evil, you know" you laughed
So, it looks like my breasts have grown quite a lot already. They were now a D cup, and would be E in 14 seconds. So far, your bra school uniform had done a good job at holding your expanding breasts, but you felt that they would soon be unable to cope with them.
"Nayuki.. your breasts are getting so big! I think they're even bigger than mine now" Matsuri said with a hint of jealousy in her voice.
"I think so too, but I don't think I'll stop this anytime soon... it feels way too good for that."
Your uniform was starting to tear at your neckline, showing some of your new cleavage. Just as you looked down to get a good view of your growing boobs, you heard a loud "SNAP", and your bra got loose. It got stuck somewhere in your shirt, because your shirt was getting pulled tight by your breasts. "Whoops, I gotta get that out of here" you said. You grabbed the bottom of your shirt and pulled both sides outwards, making your breasts - which were now somewhere around FF cups- shake a little. Your bra fell down to the ground, but you could not see it without taking a step back because your chest was in front of it.
Meanwhile, the girls were either looking at your new chest in amazement, or discussing the possible limits of the device.
The tear in your school uniform had grown a lot bigger since last time you checked, in fact, it had torn so much, that you decided to just tear the whole shirt off. You didn't care about showing your breasts to the girls. You had big breasts, and you wanted to show them.
The girls were speechless; they definitely didn't expect this from a shy girl like you.
Your breasts looked big enough for enough for now, standing at a nice and big H cup. They were nearly perfectly round, with nipples nearly 1 inch long each.
Then, Kyoko asked: