For most of the day, Ardyl's alchemy lab had been filled with the sound of bubbling liquids and clinking glassware as he worked on his latest masterpiece. For a few weeks he'd been researching and testing, and the last batch hadn't quite come out as well as he'd hoped, but today had gone off without a hitch – resulting in a big vat full of liquid rubber, carefully sealed so that it wouldn't dry out prematurely. But it wasn't just any rubber; it had very particular properties that he was testing out.

"Elasticity seems to have improved by at least 12%..." the dark green dragon murmured as he scribbled down notes. His body was covered with loose and long-sleeved robes that were a lighter green to complement his scales. Though he didn't have any wings to account for, the robes did have a slit on the lower back to allow his tail to move freely. Finally, perched on his head was a pointed mage's hat in a similar light green color to his robes, partly covering the neat – if slightly long – dark green hair that was hanging down to his shoulders.

Carefully, he added another weight to the stack that was pulling down on a sample of his new rubber, peering closely with his yellow eyes as he took notes. "Greater tension potential..." he muttered as he scribbled into his notebook. He was almost done with his experiments... most of them. Really, they were just pre-experiments to the real experiment that he was setting up for as long as nothing disastrous happened in his lab.

Setting down his notebook, he moved to the table at the end of the lab where he had laid out everything he needed for the final test. He wasn't going to be performing it here – there wasn't nearly enough space for that – but he wanted to make sure everything was set before he left. Having to run back to the lab for something would be annoying, to say the least.

A checklist was already there, and Ardyl picked it up to go down it. "Let's see here... testing sample?" He looked down at the table. A tray of 'samples' was right where he had left it – part of his batch of rubber, shaped into circular discs that were thicker around the edge. To the untrained eye, they looked like glossy grey condoms... because that's exactly what they were.

"Check." Ardyl announced to the otherwise-empty lab. "Enchantments upon the test subject..."

Which would be him, of course. It was his own work, and he would be the one to determine if it was any good or not. Putting down the checklist, he opened up the front of his robes, letting them fall open. Underneath, his smooth and lithe body was bare, including the dragon's currently flaccid and sizeable shaft, and the big, heavy balls under it that rested on his inner thighs, the sack covering them so smooth and sleek that it was shiny and glossy. Reaching down, he cupped his balls in one hand each as he muttered another, longer incantation of magic.

His hands and his balls both began to glow as the spell took effect, elaborate bright green runes writing themselves out on the surface of his testes. After a few seconds, the light faded, but Ardyl could tell it had worked – the balls in his hands felt much lighter. For while he fully intended to give his new condoms a more traditional test in due time, he had decided to perform the initial durability test by filling them with air rather than his cum. A trivial enchantment for someone as practiced in transmutation as he was, certainly, and it would get better results – cum would be far too heavy to use as a baseline test, after all.

Exhaling, Ardyl let his balls fall back into place against his thighs, closing his robes before taking the checklist again. "Check." he declared.

After a few more miscellaneous things – a fresh notebook and writing supplies, the keys to his lab, and so on – Ardyl was ready to leave. With one final check to make sure no potentially dangerous equipment was still running, he left his lab and started walking towards the town square.

Normally he would never think of doing such a thing in the town square – even if the residents of Unity were quite used to this sort of display from their benevolent ruler and those close to him. But, Ardyl was nothing if not dedicated to, and excited by, his research. More practically, he needed a lot of flat space, and the only other option would have been to leave the town entirely and head for the fields outside. There was something to be said for putting on a show, too; perhaps once he demonstrated the capability of his newest mixture of rubber, there might be potential buyers in the audience!

Once he arrived at the town square, he glanced up to the sky – it was a mostly clear day with only a few small clouds, but there was no chance of rain, just as he had predicted. The less potential interference with the test, the better. Glancing around, he noted that there were still quite a few people around – it was late in the afternoon, so the town square wasn't packed, but there were still several residents roaming around or relaxing.

Reaching into a pocket on his robes, he pulled out the condom he had brought along for the test before reaching down and undoing his robes. This time when they fell open, he was decidedly not flaccid; his shaft bobbed with excitement to match his own, the dragon full of eager anticipation at what he was about to do. A few nearby townsfolk saw this and gave encouraging calls to him, with one of them even whistling – Ardyl's cheeks flushed red, and he glanced down to avert his gaze and focus on his task.

With one hand he tugged the forescales on his cock down to expose the tip, and used the other to roll the rubber condom down his length. Grasping his shaft, Ardyl began pumping his hand back and forth along it rapidly, doing his best to ignore the appreciative calls from the nearby townsfolk as they grew louder from watching the display – and from more people noticing and stopping to watch.

His other hand fished around inside his robes as he pumped his cock continuously, and he pulled his notebook and fountain pen out to prepare to take notes. Eyes closed, he stopped panting briefly as he brought the pen to his mouth to pull the cap off, thrusting his hips into the grip of his hand as he stuck the cap on the other end of the pen. However enjoyable this experiment might be, he needed to be able to take notes!

With his notebook and pen at the ready, held tight in his left hand, he took a breath and quickened the pace of his masturbation, spreading his legs a bit as his balls swung back and forth between them. He wouldn't last long, and it wasn't his intention to do so anyway; the experiment wouldn't truly commence until he came. So there he stood, drawing a crowd he tried to put out of his mind as he kept his eyes closed and focused on the pleasure his hand was bringing him, stroking back and forth rapidly along the full length of his condom-covered cock. His breath came in gasps, his moans growing louder and higher until...!

With a shudder that went from his head to his tail-tip, Ardyl arched his back and moaned out as his eyes opened, staring up unfocused at the sky as his climax began. His balls pulled up towards him as they began to unload, and he kept his hand at the base of his shaft, holding it firmly there. The condom swelled outward from his shaft like a balloon, but despite his cock throbbing within his hand, his balls visibly tensing, only air came out from the hole at the tip of his glans to fill the rubbery condom. 

Everyone near him could hear a sound like a venting pipe as large blasts of air were forced from his tip and into the gray rubbery condom, quickly pulling its surface taut as it expanded, the smooth surface shining brightly in the sunlight. His knees growing weak, Ardyl slumped down to sit on the ground with his legs spread, the condom growing rapidly in size – already it was big enough to fill the space between his legs, and could have served as a beanbag chair for someone daring enough.

He groaned loudly into the open air as his orgasm continued – it had only just begun, after all. Each eruption of air into the condom made it swell outward suddenly like a balloon being blown into, producing a series of rubbery noises as the material stretched. It grew quickly to the size of Ardyl himself, as he lay back and sprawled on the ground, his hips thrusting upward against the balloon he was making, causing it to squeak as his sleek scales rubbed against it.

Putting down his notebook and pen on the ground next to him, he reached up and grabbed onto the expanding balloon with both hands, keeping a firm grip on it as his unsteady thrusts became a more determined humping. With each thrust of his hips, his bouncing and enchanted balls unloaded more air into the condom, stretching it further to greater and greater sizes as it rapidly surpassed him and soon began to swell above the height of some of the nearby single-story buildings.

Panting, Ardyl let go of the balloon to grab his notebook – even with his climax still ongoing, he had to focus and take notes! Between moans and bucks of his hips, he managed to grab his things and held them where he could see both the notebook and the balloon. "No problems... at over my size!" he gasped out as he scribbled down notes. "The formulaic error... in the last batch... is fixed!" Another long groan escaped him as his shaft throbbed and unleashed more air into the condom, his body trembling against the ground.

The crowd around him backed away to make room for the expanding balloon as he lay under it, something he could only do because he was filling it with air. "No abnormalities... along the exterior surface..." he panted out between moans, glancing between the balloon and his notebook. The expanding condom creaked louder as it grew to greater heights, gaining in size a little slower than before. But it was still rapidly getting larger, quickly approaching the height of the tallest, four-floor buildings in the town.

A heavy shudder ran through Ardyl, making him stop for just a moment before giving a heavy thrust upward into the squeaking grey balloon. The whole thing bounced a little, wobbling in the air above him and bouncing gently against the rooftops of some nearby buildings harmlessly. Focusing enough to grab his notebook, he scribbled down more notes as he watched it wobble against some of the buildings and chimneys; this rubber was durable enough to handle small scrapes with ease, he was sure of that. He stopped mid-word and took his pen off the paper as he groaned and writhed in pleasure, cock throbbing as blast after blast of air surged through his loins and into the condom, finishing his note after regaining his senses.

Bigger and bigger the condom grew from the seemingly endless supply of air he was pumping into it, higher than the town itself; not only could anyone in the town see it by now, but anyone on the roads leading in would surely notice the enormous and growing gray balloon. The shiny surface glinted in the sun, though it was finally being stretched enough that the surface was beginning to become partly transparent, some of the blue sky barely able to be visible to those looking through the rubber.

"Can't stop now..." Ardyl gasped as he stared upwards for a moment before bucking his hips again, cock pumping more air into the enormous condom. Gripping his pen tightly as he shivered in pleasure, he dictated as he wrote; "Capacity seems... greater than previous optimum formula..." he squirmed from side to side, the balloon squeaking as his legs rubbed against it, making the whole thing wobble about. "Aah... already at previous record... with only minor distortion of surface..."

"How big is it going to get?!" a voice called out from nearby in the crowd. Ardyl glanced over and then quickly back to the balloon; an enormous crowd had gathered around the edge of the town square to watch, staring up at the spectacle.

"Keep going, keep going!" came a chorus of voices from behind Ardyl, making him blush, but he obliged – not that he had intended to stop anyway. With another groan as his balls continued to pump air through his shaft, Ardyl reached up and pushed against the air-filled condom carefully, making it distort briefly before wobbling and raising up a little, bouncing against the tops of the nearby buildings as it expanded outwards and upwards.

"Do you think he can pop it?" someone wondered aloud, barely able to be heard over the rubbery squeaking and creaking the balloon was making.

"That is... the intended outcome of... this experiment!" Ardyl gasped out in response, taking a heavy breath. Closing his eyes and leaning back on the ground, his hat falling from his head as he did, Ardyl took a deep breath and humped upwards with renewed vigor. Each thump of his hips was accompanied by more air erupting into the balloon and swelling it out further upwards, now having reached twice the height of the tallest building in town, surpassing the entire settlement in width.

More cheers came from the onlookers as Ardyl renewed his efforts to inflate the condom to a greater and greater size. The squeaking sounds it made any time it brushed against something were slowly getting drowned out by louder and louder creaks as the material strained to contain its contents, getting pulled a little thinner still with each additional blast of air Ardyl added to it. 

"Is it gonna blow?" Ardyl heard from nearby.

"I think it might! It's getting pretty thin!"

"I can hear it creaking so much! It's totally going to blow!"

"I don't know, it's already this big, it could get bigger!"

Ardyl brought his focus back to the ballooning condom and looked up again. It completely covered every inch of the sky that he could see from where he was, and he quickly grabbed his notebook to record more notes. "Durability surpasses... all projections...!" he gasped out as he wrote, trembling and shuddering and nearly dropping his pen as he gave another few upward thrusts of his hips against the squeaking and creaking balloon.

Panting, he gripped the pen tighter and continued to write. "It has grown... larger than the town..." he glanced upwards over the rubber, seeing it growing unevenly thin, some patches more transparent than others. "...but I suspect... an imminent structural failure."

As if to back up his words, the gigantic balloon creaked again as he shuddered underneath it, longer and louder than before. There was no doubt in his mind that anyone on the entire island could look out and see it, and with any luck, they would see what was about to happen...

"It can't take much more!" someone called out from the crowd.

"It's gonna blow!"

"Go on, finish it off!"

"Yeah, pop it!"

Unsteadily, Ardyl thrusted his hips upward, panting and gasping for breath, bracing himself on the ground with his hands. The balloon creaked ominously again as it wobbled and bounced above him – above all of them – an audible warning that it was reaching its limit.

A limit that came suddenly, as the pressure within the condom became too much for it to bear. Somewhere on its massive surface the rubber tore and failed; far too fast to be seen with the naked eye, that tiny rip tore across the rubber in all directions as it exploded. A thunderous booming rumble that could be heard across the whole island and far out to the sea around it roared out as the entire balloon was torn apart from the force, sending scraps of rubber up into the air to rain down, fluttering like confetti.

Ardyl flopped onto his back and gasped for breath as his climax finally came to an end after his cock fired a few more blasts of air into the open. As he lay there and recovered, once his ears stopped ringing from the explosion he could hear everyone around him cheering from the display he had just put on.

Trying to ignore the fact that they must all have been looking at him, now that the balloon was gone, he raised his notebook up to turn the page and take one final set of notes. "Conclusion..." he forced out between pants for breath, eyes barely open so he could see the page, "...astounding success... exceeded expectations..."

He paused for a moment as he took another breath before moving his pen to a new line.

"...with slight alteration to formula... could be bigger next time...?"