It's autumn, and the Cutie Mark Crusaders walk into the center of Sweet Apple Acres: Maple Treeway Edition!
Apple Bloom set up a tank of helium, and put on her goggles along with the other two. She asked if they were ready to have an adventure in the sky, and they shouted "YES".
Apple Bloom, Sweetie Belle, and Scootaloo connected three hoses to the tank, put the other end in their mouths, and turned the tank on.
Slowly, their bodies filled with helium, and they became rounder and rounder. Their limbs sunk into their skin, to the point where they couldn't move them anymore, and their cutie marks stretched out. Then the tank became empty.
Now, the Cutie Mark Crusaders were massive spherical blimps! The helium filled them up to be nice and big and round, they were completely immobile, and they floated in the air like balloons with their mouths still connected to the hoses. Then they let go OF the hose.
They slowly floated up into the air, the wind blowing against their expanded skin, and as they departed from the acres, they started talking about how much fun they were gonna have up in the air.
They planned to belly bump each other, relax on the clouds, and have an epic view of the town. Also, Scoots was excited to (artificially) fly.
A couple minutes later, they were 10,000 feet in the air, and they were surrounded by clouds. The helium in their bodies though thankfully kept them warm, and their skin was still thick so the pressure didn't pop them.
After they stopped floating upwards, the CMC began having fun. They belly bumped each other, and twirled their tails to blast themselves forwards. The trio giggled as their bodies jiggled from each bump.
A while later, they rested their ballooned bodies on the clouds, and man, those clouds were SOFT.
That's when they saw Spike, Smolder, and Ember, who were having a nice fly, and when the dragons saw them, they were surprised. The CMC let them lay on each of their inflated bellies, as they felt like pillows.
A couple of hours later, after the dragons left, the helium started to wear off, and the CMC floated down slowly. They got a great view of the town, and they loved every second of the sunset.
Several minutes later, the trio finally landed back in Sweet Apple Acres. Their bodies were still inflated to a massive spherical size, but now they were filled with oxygen rather than helium.
Applejack then came into the scene and found the trio adorable in their bloated state.
The CMC will have to remain in their bloated state though, at least until the air wears off, which will be 2 months. But they don't mind, since they're very comfy. Heck, even Scoots doesn't mind, since she still has the approval of her peers.
The moral of the story: Inflation being fun is better than inflation being sexual, at least in terms of fictional child animal inflation. But please note I don't like HUMAN child inflation. Only animal characters, since it's more cartoony.