"Alright, Piper, you've got a whole 12-pack of these things, there's no going back now." A young woman, around 21, sat in front of her desk looking at a box. The box in question contained cans of Dr. Pepper, a drink she had picked randomly off the shelf. Once she opened the box, she couldn't return them, eleven years of protective parents leading up to this moment.

  
Piper was a hybrid - half Lucario, a jackal-like Pokemon whose main ability was sensing people's life force, and half Latias, a psychic dragon Pokemon able to fly faster than a speeding jet. Her hybrid appearance aside, something was off about her, though. Maybe it was the faint peppermint scent that trailed her, or the fact that the metal spikes on her body didn't have the same gleam other Lucario's spikes did. Whatever it was, it mystified most people, including herself. Which is why, 11 years ago, she was confused when one tiny sip of Sprite made her feel full, especially when her stomach had been empty before. After telling her parents, they banned her from drinking any carbonated drinks at all. But today... Today was her chance.

  
Piper lived in an apartment with a housemate, but her housemate was out for the rest of the week to see family. This meant she had nobody to stop her from buying a whole box of these, taking a can out, and chugging the whole thing. And, seeing as how her parents no longer had authority over her, she took the opportunity to do just that. The liquid was much sweeter than any drink she'd ever had, even juice, and she had to admit something; it wasn't half bad. The carbonation would take some getting used to, especially with how long it stuck around. Much longer than in the can when Piper opened it. ...Wait... Was it normal for the bubbles to linger for so long?

The winged jackal blinked as she suddenly started to feel full again. This was the same feeling she had felt 11 years ago. But wait. Even if she had grown significantly since then, it wasn't just a sip she took, she had completely emptied the can... So what was going to happen? As she asked herself this, she almost got distracted enough to not notice a faint feeling in her stomach. She was just barely able to snap back to reality to notice it... her belly was starting to grow! The soda had somehow started to go crazy inside her, and was now filling up more than she expected her stomach to hold! But... it didn't hurt. It felt... good. Quickly, she got her shirt off, opened up three more cans, drank them all, and just relaxed.

As her belly grew, Piper couldn’t help but reach down and rub it. Even as it grew more and more, it remained covered in soft red fur, as if some sort of magic was generating more and more to cover her stretching skin. It felt nice, but her breasts were starting to push her arms apart. …wait a minute… Were her boobs always so… huge? Normally, they were already somewhat big, but they had swelled proportionately with her stomach. And they felt… strange. Slowly, she raised her left hand to her breast, and softly rubbed it. The growth had made it more sensitive, and this would likely be the case with the other. Thanks to the sensitivity, a sudden realization soon hit her… she had only removed her shirt! Her breasts were starting to press against her bra, and it was starting to cause mixed feelings of both pain and pleasure… She reached behind, and using the spike on her hand, snapped the back of her bra off, allowing her huge, growing breasts to plop down onto her stomach.

She sat lost in the moment for what seemed like minutes, as she noticed that the bubbles began to grow kinda light, as if they were starting to leave her body. But how, when she was still bloating up? This thought was cut short when suddenly, a strange sensation began building in her chest. It was nothing like the feeling of growth, more like something was building up, waiting to be set loose. It slowly developed into a different feeling, as her pale pink nipples slowly began to harden, the pressure moving in their direction. And then it happened; they began to spray the huge amount of excess soda foam building in her body! Arcs of fizz shot from her nipples as if a whole pack of Mentos was dropped into a bottle of soda attached to a misting hose attachment. The feeling became too much for Piper, and she began to moan softly as she rubbed her spraying breasts and began removing her jeans. After making sure everything was off, she grabbed a few more cans and slugged them down just as fast.

The next sensation was very strange for Piper. The new cans of soda counteracted the sudden spraying, as they only served to fill her up even more and even faster. But still, she seemed… lighter than before. She hopped up off the couch to head for her room, so she could just relax, swell, and spray in peace, but underestimated her Fighting-type power… or did she? A normal hop onto her feet lasted twice as long, and it felt almost as if something was helping her up. She blinked. Was it the soda? No way, carbon was heavier than air, she must have been lost in the moment and hallucinating due to the pleasure. But soon, the feeling returned, and make no mistake, it was real. Somehow, the carbon dioxide gas was being transformed into some sort of method of creating lift. And the first balloon she’d get to witness doing this… was herself! But… it might not be that bad.

Another minute passed before Piper’s feet, kicking feebly, left the ground. Drifloon hybrids, eat your heart out, she thought as she rose up into the air, still spraying soda everywhere. The foam made it seem like more was spraying out than there actually was, but it wasn’t enough to keep her from rising up to the ceiling, belly-first, and lightly bouncing off the ceiling. It was honestly starting to become both relaxing and a huge turn-on. She could see herself doing this often…

Piper snapped out of her reverie with the slam of a door. "Hey, I forgot my charger, s- Wh-What the!? Piper, is that you!?” She quickly looked over to see her housemate, a Cinderace named Emma, covering her blushing face. Emma was very shy and easily flustered, much different from any other Cinderace she knew. It was… kinda cute, honestly. “I… um, yeah… I guess soda did this to me…” “B-but how!? There’s so much wrong with the physics behind it… And the growth you experienced…” “I don’t know either… But hey, you’re a huge bookworm, right? Why don’t we find out together? You know, after we clean the place up, and you come back from your vacation…” Emma continued to stare, blushing. “Well… Um… Sure… But if I’m being honest… Would you mind if I said… I kind of… l… lik…” Piper reached down and gave her a thumbs up. “Hey, you don’t even need to say it. It’s honestly really fun, and if you want me to do this more… Well, I doubt anyone will question the sudden purchase of, like, 20 two-liter bottles of this stuff.”