“Let’s see, what to pick, what to pick…” Mary mused, picking through her wardrobe stuffed to the brim with colourful costumes and foam props. The tall, curvy futa’s hips rocked happily back and forth in her denim short-shorts, her bubble butt in the back matched by a hefty bulge in the front. She was currently a month away from PlusCon her favourite convention of the year, and her excitement was tempered only by her indecision. An enthusiastic cosplayer with years of experience, there was nothing Mary liked more than to try new things, but she was starting to feel like she had exhausted her usual tastes.

“Hmm, should I do Ryuuko again?” She asked herself as a large red scissor-shaped sword tumbled into her thigh. “Nah, there’ll be a dozen of her there… Spider-Gwen maybe? I haven’t worn that in years… No, everybody’ll think I’m just trend chasing even though I was doing it before it was cool…”

Mary spent another ten minutes failing to decide, then, running her hands through her brunette bob cut, short enough to easily fit into any wig, she gave up and collapsed onto her sofa, her DD-cup breasts bouncing heartily. Even if she tried a new character, there just wasn’t a sense of excitement! After a few minutes of pouting, she recalled an idea she had been sitting on for a while: rather than change the costume, why not change herself?

She wasn’t talking about binding her huge breasts and trying to pass herself off as a male character, but rather the opposite: she could increase her curves through a simple gas-inflation technique common with enthusiasts wanting to match the proportions of their favourite characters, blow herself up to proportions only seen in comic books, manga, and trashy video games. Although, Mary considered as she cupped her breasts through her thin tank top, she was already curvy enough as-is. In fact, for a futa, her chest was actually on the petite side. She’d have to go seriously overboard in order to make it count, which reminded her of an old friend and cosplaying buddy she had who had come up with a similar idea.

Flat as a board and with curves like a cardboard box, her friend Emma had an obsession with living out her cosplay dreams as the curviest characters she could find, and after being unable to settle merely for an hourglass figure with breasts the size of her head, had eventually fallen in with a particular subculture known as balloon cosplayers. Using helium to inflate themselves, balloon cosplayers made themselves lighter than air and soared around convention halls imitating characters who could fly, an exclusive club up in the rafters that had led to an entire second floor of sorts being erected at most events to cater to them. This year’s PlusCon had proudly advertised its facilities catering to balloon cosplayers, and to be honest, she had been rather jealous watching Emma float around the room as she pleased, unfettered by gravity.

Her mind swiftly made up, Mary dialed her friend with a broad grin on her face.

“Hey, Emma? Yeah, it’s me, I was wondering if you could give me some advice, and what brand of pumps you used for your Supergirl cosplay…”

–

“Finally!” Mary cheered as she dropped her package onto her sofa, hardly caring that she’d had to chase down the lazy delivery boy then lug the heavy box all the way up the stairs back to her apartment. “I was starting to think it’d never arrive.”

Mary’s apartment was covered in bits of loose fabric and discarded tools, having completed her costume that same day and was eager to try it out, with two weeks left until the convention for any final adjustments. Although Mary tended to pick female characters, she had decided to go with her own sex for once, picking out, Freyja, a popular futa hero who had been one of the major publishers’s attempts to pander to the demographics in the early oughts. While she did like the design, with its long flowing blonde hair and traditionally heroic boots and gloves, it was originally a bit of a Power Girl knockoff and had undergone a few redesigns since then. She had picked out the original design for its simplicity and flexibility, resembling a two-part swimsuit with a large cleavage window and stretchy bloomers, plus a cape. If she overshot or undershot with her proportions, the simple costume with its stretchy materials would compensate.

She sliced open the box, producing a machine with a mess of tubes and helium tanks, carefully putting the thing together before stripping entirely, her package flopping out. She had paid for a special five-ended hose attachment, which promised maximum efficient inflation for futas.

“Let’s see, this goes here, and here…” She mumbled as she placed the valves that allowed her to inflate herself in the first place to her body, firmly affixing them first to her nipples, then to her hips, then finally one to the end of her sensitive member, which swiftly stood up and went fully erect as she attached it to the tip. When she was done, all she’d have to do is release the valves and wait for herself to deflate. She carefully attached the hoses, then went to start up the pump.

“Just press this here, and…”

The machine beeped and whirred to life, hissing as the helium was fed into her body.

“Mmm!” Mary bit her lip as she felt herself began to inflate, her hips widening and her breasts blowing up like balloons. No wonder Emma’s cosplays had gotten curvier over time, when it felt this good!

“Ffffuck…!” Mary gasped as her tender cock was overwhelmed with pleasure, Mary panting and occasionally moaning as her body got bigger and bigger. Her waist remained the same, but hre breasts rapidly exceeded the size of her head, and her hips grew past her shoulders, her ass bigger than a truck’s steering wheel and only getting bigger. Her thighs doubled, then tripled, as did her arms, turning into puffy cylinders that, while mobile, were unlikely to be too useful for helping her fix her costume if it were inadequate. Despite her bulk she felt lighter than ever, moving her chunky limbs around weightlessly. Distracted by the pleasurable sensations coming from across her whole body, Mary didn’t quite notice just how much of that helium was going directly to her cock until it became too thick for her to wrap her hands around, Mary’s eyes widening as it kept growing until it was practically a third leg, yet she was too horny to stop it.

After a moment of sweet, sweet bliss, she felt her feet slowly drifting up off the floor, and rushed to turn the machine off before she went too far. The hoses wheezed as they fell free, although the one wrapped around her cock required some tugging.

“Damn, I look hot!” Mary exclaimed as she hopped over to her mirror, holding something heavy to keep herself on the floor. Her breasts were twice the size of her head, with a dump track ass that rivaled her breasts in size. Her tree-trunk like thighs looked like they could crush a man were it not for being filled with gas, and her arms were as thick as a stereotypical nineties superhero, yet soft and smooth. Then there was her absolutely gigantic penis, requiring all of her self control to not jerk herself off here and now. Luckily, most futa cosplayers tended to be erect for most cons, unable to help themselves between the sexy cosplayers and their own often erotic outfits. Still, being nearly half as tall as her might be a little much, but it was certainly fun for now. Letting go of her anchor, she let herself float until she bumped into the ceiling, bracing herself with her hands then pushing herself off. She whooped as she nearly knocked out a lampshade, bouncing around the room with her lighter-than-air body. If it was this fun in such a confined space, she could only imagine it in such an open area!

Eventually she forced herself to hold herself in, landing on the ground. It was a good thing she had two weeks left, because she was definitely going to need to make her costume bigger. She looked at her valves, ready to return to normal, then paused. Why stop now when she was having so much fun? She had to get used to moving in this body for the event, after all…

–

“May I see your pass?” The PlusCon doorman asked, Mary digging it out of her voluminous cleavage and flashing it with an easy smile. Finally, she was in! She had spent the entire wait in line wishing she could just bounce over all the normal attendees and cosplayers, but rules were rules, and she had remained landbound with her heavy bag, although between her huge ass and her massive cock sticking out in front of her, reluctantly reduced down to a mere two feet for the safety of the other attendees, until finally she was able to saunter through the doorway, drop her bag off, and leap off the ground into the air, leaving other con-goers to stare happily at the great view of her ass she was giving them.

Mary drank in the convention atmosphere as she floated through the literal convention atmosphere, the big day having arrived before she knew it, and her floating training having come in handy as she looked down from above on the packed convention floor and all of the amazing cosplays form a whole new angle. Although there were a number of balloon cosplayers around and above her, there was an enormous amount of empty space compared to the busy floor, and it started to almost feel like an exclusive club. Exaggerated hourglasses were the most common form, but others had bulging bellies or nigh spherical forms, simply enjoying bouncing around wherever their poorly controlled bodies took them. After enjoying the artist’s alley manned by inflated artists in makeshift tables hanging from the ceiling, selling almost exclusively art of popular characters blown up to similar proportions, Mary decided it was time to return to the usual hustle and bustle of the con floor, and let herself slowly and gently fall downwards. Her belt and cape were just heavy enough to cause her to drift very slowly doward, and keep her on the floor as long as she didn’t hop too hard.

Looking back up after she landed, she noticed an hourglass-figured Batwoman cosplayer in a vivid red wig heading for the same open landing zone as her, Mary’s jaw almost dropping all her detailed costume. The Batwoman touched down with a jiggle, her proportions similar to Mary’s save for her being a batwoman and not a batfuta, but when Mary approached to compliment her that she had the detail down to the letter, she realised that up-close the latex bodysuit was actually extremely well-done body paint, even her red bat-symbol painted on. Her gloves, boots, utility belt, mask, and wig were of course proper pieces, but the rest of her body had simple pasties to cover her genitals and keep her within the very loose rules of the convention. Body paint solved the problem of having to build a costume around your exact size, now that Mary thought of it. If you simply used paint as a base, you could have your body be all shapes and sizes.

“Hi, I just wanted to say that I love your cosplay!” Mary enthusiastically greeted the fellow soul.



“What a coincidence, I was about to say the same. I like your taste, your cosplay’s super sexy.” She smiled. “Classic Freyja? Nice choice. The redesigns never clicked for me.”

“I know, right?” Mary blushed at her praise. “I’m Mary. Is this your first time? I don’t think I recognise you.”



“Name’s Taylor. I don’t know how we missed each other, ‘cause I’m here every year and can’t get enough of this. Then again, I’m usually up there instead of down here.”  Taylor pointed upwards.

“Makes sense, this is my first time doing the whole, you know.” Mary gestured at herself. “How’s your time here been? I only got here a few minutes ago.”

“It’s cool.” Taylor shrugged. “Almost the same as every year. They stick more crap up there every time, but PlusCon’s always been ahead of the game on balloon cosplayer events, so it’s about the same besides what my friends and I do.”

“I see.” Mary said. “And they’re…?”

“Not here.” Taylor sighed. “Everybody except me had plans, so I’m here all on my lonesome. It’s kinda boring, to be honest. Wanna hang out, hit up some booths?”

“Sure, why not?” Mary smiled. Meeting new people was half the fun of cons. She was also well aware of how Taylor had been greedily staring at her huge futa member bulging through her cosplay, although she cutely tried not to show it and tried to look like she was instead merely admiring her costume. Mary had hooked up with both men and women at cons before, and was more than happy to indulge her.   “The more the merrier.”

“Sweet!” Taylor looked extremely pleased. “Anything you wanna do first?”



“Well, I heard they have a new section for inflatable cosplayers. It’s my first time, so I’d like to do everything I can’t do on the ground.” Mary suggested.

“Sounds good to me, I didn’t even know.” Taylor admitted. “I kind of came at the last minute after my friends bailed, I hardly planned ahead, so the day is yours!”

–

“Seriously, they got a whole-ass obstacle course?” Taylor giggled at the elaborate zone set up for them, attended by a blown-up woman in a PlusCon uniform and a floating line of balloon cosplayers holding onto a rope together. “Sure, why not? I’ve been to these with my friends before.

“Last year they had escape rooms as their big gimmick.” Mary recalled. “I guess they wanted to get more people into inflating?”

“Next please!” The employee called, the two floating into the padded room with the other cosplayers.

“What’re the rules?” Mary whispered, making sure her wig was on straight. The course would have been quite easy had she not blown herself up in every direction, risking a puncture on even her arms and legs if she wasn’t careful.



“Don’t get popped!” Taylor giggled again as the wave of contestants entered, Mary going a little pale at just how many pointy objects were in the room, spiked balls and traps littered across the floor, tight holes,  and various no-go zones intended to test contestants, there only being a few safe places to push off from.



“Popped? I’m not gonna burst, am I?” Mary fretted. “That’s not legal, right?

“Don’t worry, it’s just a little prick.” Taylor reassured her more seriously. “Most of this stuff can only puncture you because your skin’s so taut. You’ll just lose helium slowly from your whole body out of the puncture… or quickly, if you really screw up.”

“The first one to reach the end is the winner!” The employee explained to the half-dozen cosplayers. “You lose when you become unable to float! And… go!”

Mary and Taylor pushed off, Mary really feeling like a superhero as she carefully bounced herself off the walls and made sure not to land breasts or ass-first onto any pointy objects. Taylor deftly rotated herself through the air, the course trivially easy to somebody as experienced as her. For others, it wasn’t so simply. A Sailor Moon cosplayer with an octuplet-sized belly found herself unable to manoeuvre herself gracefully, and was soon tumbling directly towards a nasty looking spike.

“Nonononono-” The magical girl squealed until she landed belly-first, puncturing her moon-shaped gut and causing air to hiss out, sending her flying straight back the way she came until she was spinning around the room, clinging to keep her wig on for dear life until finally she ran out of helium, shamefully floating to the ground, too dizzy to move.

“Just don’t end up like that!” Taylor laughed at her misfortune, and Mary grit her teeth and doubled her efforts. The two approached a tight hole that led to the second zone, Taylor dancing ahead of the rest of the slow and cautious group, almost taunting them with how she could have gotten to the end already but stayed behind to check up on Mary.

“You’re doing great, girl!” She giggled, floating back through the first hole as Mary tried to line herself up with it. “Need a hand?”



“No, I can- Aah~!” Mary groaned as Taylor tugged her through, the tip of her cock rubbing against the padded bottom of the hole. Mary flushed, barely able to contain herself as her erection stiffened even more, Taylor’s irritating but beautiful grin seeming even sexier now that she was horny. Worked up, Taylor continued to tease her, putting her in situations where her cock got stimulated by brushing up against something, including herself, or caused her to go from flushed to pale as Taylor prodded her into getting a little too close to puncturing her pride and joy on a spike.

“Just go and win already!” Mary moaned, clutching her cock with one hand and trying not to stroke it as Taylor giggled at her.

“Come on, those slowpokes have hardly moved.” She pointed at their two remaining rivals trying to manoeuvre through a maze of spikes, a Ryuuko and Spider-Gwen who scowled at how Taylor was making a mockery out of their efforts.

“Just get on with it!” Mary urged, unable to take much more of her teasing.

“Fine, fine.” Taylor sighed. “Coming through, ladies!”



Taylor attempted to barge through, but the irritated Ryuuko grinned mirthfully and, quite against the rules, shoved her directly towards a spiked ball, Taylor squealing as she lost control and span out.

“Aagh! Mary, help me! Help me- Ooooow!” She cried as her right ass-cheek landed squarely on a spiked ball, instantly puncturing her and sending her rocketing upwards into another spike, blowing out her left boob and causing her to spin out in random directions, wailing woefully as Mary abandoned her race for the finish to try to catch her, totally unsuccessful as Taylor shot around the room faster than she could keep up.

“Serves you right!” The Ryuuko cosplayer laughed, only to yelp as she was grabbed out of the air by Mary, who had nearly bumped into her during one of her failed attempts to catch Taylor, and the Ryuuko’s smirk evaporated in the face of Mary’s glare.

“What the hell do you think you’re doing!?!” Mary yelled angrily.

“Hey! Get your fat dick off of me!” The cosplayer whined, trying to shove her off and sending the two careening in opposite directions. Mary managed to course-correct midair and just barely landed in a safe patch, but the Ryuuko was sent crashing into her Spider-Gwen partner, the two pinballing into the spikes that outlined the final hole before the finish line, the Ryuuko piercing her left breast and blubbering as she clung to the Spider-Gwen, who herself clung to the nearest handhold lest she be dragged away by her friend.

Meanwhile, Taylor began to slow down, her proportions lopsided as her pierced parts deflated first, Mary eventually managed to catch her and hold her steady, carrying her back to the start line and apologising to the woman managing the course as Taylor’s arms and legs returned to their natural slender proportions. Taylor seemed too out of it to take the official staircase down for deflated losers, so Mary took the direct route before Taylor lost all of her helium and became too heavy to carry.

“You deserved that.” Mary said sternly, although more out of concern than anything as the two landed on the con floor.

“Okay, maybe I did.” Taylor laughed weakly, looking dizzy and unable to walk straight as she leaned on Mary’s shoulder. “I think that might be it for me today though, there’s no way I can maintain any lift like this, even if I patch myself up.”

“Well thanks to somebody I’m all worked up, and to be honest, right now you’re so hot I can hardly think straight, even without your tits and ass..” Mary said. “Wanna call it a day?”



“Maybe. Wanna go back to my place? If I can still walk afterwards, we can go out for dinner.” Taylor laughed, the two exchanging a quick kiss as they hobbled out of the convention hall, Mary uttering one final cheerful  comment.

“I have got to try this again next year!”