Air and Helium

Nia was pissed off she had been snubbed from getting to play in her volleyball match during her PE class, Snubbed for Amber Matthews the bitch and Nia was assigned ball duty of all things. Her job was to spend the hour pumping the bag of partially inflated balls so all of them were fully inflated. After 20 minutes she’d given up and wondered what she could do with the hand pump.

A grin crossed her face as she looked down at her B cups, she had a modest body her thighs were large and led to a cute butt not too small but not too big her waist had a slight hint of fat to it but was slim overall her PE attire consisted of a tight pair of volley ball shorts and a tight white tee.

“Could do with some improvement here” She giggled picking up the nozzle of the pump slipping it in-between her lips and raising the handle of the pump “here goes nothing” She thought as she pushed down she felt a gust enter her, letting out a groan she felt her breasts push out against her bra ever so slightly.

As she looked Nia smiled “It worked” She gasped dropping the hose out of her mouth, Sliding her bra out from under her top she place the house back in her mouth and pumped harder and faster each pump brought more mass and a larger bust. Nia could hear her skin stretching like rubber and she got turned on by it, feeling her nipple harden and her pussy grow wet.

Currently she’d reached a c cup but wanted more, a lot more she pumped more swelled more and moaned more. As she went to push down once more she felt her shorts feel tighter, feeling around she noticed that her butt had swelled as well as her breasts “more the merrier” She smirked

However she soon discovered it was getting harder and harder to inflate herself with just a mere pump, looking around she spotted just what she needed, an air compressor used to inflation some of the exercise balls they used during workouts. “Perfect I’ll be big in no time” Squealed Nia bouncing over with her new mass and picking up the compressor.

Grabbing the hose and sliding it inside her tight wet pussy she moaned “May as well get some pleasure from this” gasped Nia turning on the compressor which pumped air into her at a much higher rate than any pump. “Oh god” moaned Nia feeling her thighs starting to swell and strain her shorts.

Just a few minutes with the compressor and Nia started cumming in her shorts the pleasure too much for her and making her falling on her now basketball sized rear. Her gasps and moans echoed through the hall as did the hum from the compressor. Nia’s breasts also reached basketball size and lifted her t-shirt to expose her cute lil belly. As Nia came to her senses she noticed that class would soon be over and she’d need to get changed first as not to attract attention.

Pulling the hose from her she found it slick with her juices, turning her on even more. As she waddled to the changing rooms she found her shorts now gave her a pronounced wedgie “thank god I don’t wear undies with these” giggled Nia. It was at this point she realised how big she’d made herself as her trousers couldn’t get past her thigh, looking round she spotted a pair from one of the bigger girls in class and swiped them “desperate times as they say” Nia slid into them and buttoned them still straining against her body but she didn’t have a choice as she waddled off to science.

Arriving in class she was still late as her added bulk slowed her down, even sitting down was a chore as she was significantly taller on the stool thanks to her butt. Amy her friend in the class noticed her new changes straight away “Woah bubble butt how’d you get so big?” Smirked Amy

“Oh I just had some help is all baby” Said Nia with a cheeky wink struggling to get comfy on her stool, she was more shocked when Flint Matthews one of the best looking guys in the class sat next to her “He must like Tits and Arse” whispered Nia to Amy. However at the back of the class Amber Matthews spotted Nia’s recent expansions and was even more so in raged that she had stolen Flints gaze from her.

Suddenly Amber spotted a helium tank next to her and while she’d love to inflate herself much like near she had a better idea. Sneaking under the table hose in hand she slid it down the back of Nia’s trousers. As Nia was giggling and flirting with Flint, she suddenly felt a jerk and heard a slight hissing, then the sound of her body groaning as she felt herself starting to grow again.

“What the!?” thought Nia as she groaned aloud as her thighs bloated larger, her but rose beneath her and her tits pushed their way forward even her nipples were plumping. Nia continued to groan verbally and from her body. “Are you alright Ni?” questioned Flint looking at her bloating body, it was at this point that Nia felt herself starting to float from the stool. She quickly grabbed the edge of the table and pull herself under it “of course Flint I’m fine” giggled Nia with a smile.

It was then that she felt her stomach starting to creak as it bulged out looking to catch up with the rest of her expansion, groaning again she could feel her whole body swell out into a ball “Ni you ok?, you look bigger” Whispered Amy Nia could manage little but a groin and a smile back still trying to keep her cool as she could feel her shorts straining beneath her trousers.

As everyone started to turn and stare and Nia’s bulging body she lost her grip and floated upwards. It was at this moment Amber twisted the tanks handle to full blast and grinned. With a moan Nia felt her already swollen body swell with a faster pace, her trousers tearing off revealing her straining shorts that were clinging for dear life and soaked from her arousal from the whole thing.

As her t-shirt gave up the fight as did her shorts Nia let out a moan as her belly button popped to man outie, She floated high above the class and felt her expansion stop, she’d taking the whole tank of helium still hadn’t popped. She felt herself being tugged down by the hose in her butt, Nia finial realising why she had started swelling in the first place.

As she was pulled and held down, Flint planted a kiss on the balloon girl and Nia giggled “That was a close one” as Amber Matthews stormed out of the room.