Forced breathholding practice

Late at night, an anthro dark-green brachiosaur - Shorty - lay nude on their bed. He wasn't sleeping; rather, he was straining himself quite a bit. With his chest occasionally contracting and not otherwise moving, and puffed cheeks on either side of his head, it was clear he was holding his breath. Ever since he'd discovered some time ago just how hot it was to him to hold his breath for a really long time, he'd dedicated himself to practicing whenever he could. There'd certainly been an improvement; before, he could barely manage a minute, but here he was now, his previous breath having been 5 minutes prior! It felt great to go this long without breathing, and like always, the discomfort in his lungs had gotten him fully erect, his dick pointing straight up and visibly throbbing.
Although, not matter how hard he'd try, he could never manage to hit 8 minutes, always giving up late into the 7th. This time would be no different; as a purple blush faded onto Shorty's face and his cheeks grew almost cartoonishly large, he loudly exhaled and panted. Quickly stopping the timer on his phone, he checked what it had to say: 7:42. Better than usual, but still frustratingly far from his goal. At this point, it was starting to seem like he'd reached the absolute limit of what his body was capable of, not that he just wasn't skilled enough.
Looking past his phone, Shorty was reminded of a bit of an odd event earlier in the day. Another brachiosaur, Rhett, had given him a gift of some kind, which Shorty had yet to open. The thing was, the two despised each other! Rhett had claimed it was an attempt to smooth things over between them, but it was still strangely out of character for him. The gift sat in Shorty's room, still wrapped. May as well check it out, he thought to himself, hopping off his bed.
The box was opened without issue, and inside was a strange-looking device of some sort. It was about the size of his head, with a couple dials on the front made to look like bubbles, alongside a switch, another side having an inverse cone that resembled a speaker. Despite not having seen one of these in person before, Shorty immediately recognized the whole thing as an AquaSphere, an odd machine that could somehow form water into cohesive balls. He'd been looking into getting one of these for a while, but they were kind of hard to find, and weirdly expensive.
Only now, he finally noticed there was a note from Rhett on the top: "If I forgot to say it before, sorry for being such a dick. I doubt this'll make up for that, but I know you wanted one of these, and I hope it at least helps." It certainly would go a long way toward Shorty not hating Rhett. If it worked, anyway, and Shorty put it on its lowest settings (Familiar with its usage from the many videos he'd seen about it) and flipped the switch to test it. A low whirring emitted from the AquaSphere, and sure enough, a ball of water a few inches wide slowly protruded from the speaker-like part. Shorty had never really been clear on where these machines got the water from, but what mattered was that it worked. He flipped the switch to turn it back off-
Except, it didn't turn off. In fact, the whirring quickly grew much louder, and the water ball grew with it, outgrowing the machine in only a second and continuing to accelerate its expansion! "Should've fuckin' known there'd be something..." The switch was jiggled back and forth a few times to no effect, and as the water ball had already become bigger than him, Shorty pulled the AquaSphere away so he could still mess with it without risking getting trapped. Of course, another ball was already rapidly expanding, so it didn't buy him all that much time.
Randomly turning the dials, hitting the switch over and over, nothing seemed to help. Before too long, Shorty's room was littered with large water balls he had to carefully navigate around to avoid touching, and he finally accepted that turning off the AquaSphere was a lost cause, rushing to the door to escape. That, too, had an issue: It wouldn't open! He rattled the handle, but it seemed there was something on the other side blocking it, and with his room not having windows, he realized was trapped. A moment after trying the door, however, he heard a voice on the other side.
"Hey jackass, enjoying my gift?"
While Shorty wasn't sure how Rhett had gotten in his house, that wasn't his concern right now. "Dickhead, how do I turn it off!?"
"You can't! Better hope that battery runs out quick!"
Of course, during this time, the AquaSphere was still going, in the process of making the biggest water ball yet directly behind Shorty, who had briefly forgotten about it as he started banging on the door. "Let me the fuck out!"
"You got any idea how many tries it took to mod that AquaSphere and remove all the safety stuff? Like hell am I letting you go after all that."
"How did you even-!" Shorty's back brushed against the currently-expanding water ball, reminding him he was running out of time. In fact, looking behind him, this water ball was pressing against the walls at this point, leaving him with no way to get past it! He redoubled his effort to escape, slamming against the door in an attempt to break it down, and heard laughter from the other side. "Keep trying, you'll just drown tired!"
Starting to be pressed against the door by the water at this point, Shorty couldn't ram into it any more, soon barely able to move, but still able to yell. "When I get out I'm gonna kick ymmf!" Then, his mouth was smooshed against the door, though he could thankfully still breathe through his nostrils, at least for now.
"Yeah, if you get out." Rhett corrected. The water ball was beginning to cover Shorty's face now, and he panted through his nostrils before sucking in a deep breath and holding it just before the water passed over them, puffing his cheeks what little amount he could. Then, a couple seconds later, the immense pressure against him disappeared as he fully entered the water ball.
Shorty was pulled backward a couple feet, bubbles dribbling from his nostrils. He could hardly see a thing, but he could tell that he water ball's growth was slowing down, the AquaSphere's battery finally running out. Of course, only after I'm in one... It hardly made a difference, most of the space in the room was taken up by this water ball. Swimming to one of the few parts that wasn't pressed against a wall, Shorty pushed against it in an attempt to escape, but it seemed it wasn't going to be that easy.
As he thought about what he could do, sinking down to stand on the floor, he heard Rhett again, though his voice was rather hard to make out. "You underwater yet? That why you shut up?" Glaring back at the door, Shorty angrily glubbed out "Thbl hblell dblo yoblu thblink!?" It was followed by more laughing from Rhett. "There it is! Keep on yelling, make yourself drown faster!"
Like always, Shorty ignored Rhett's "advice", keeping his mouth shut to not waste more air and going back to thinking. Maybe he could pop the water ball with something sharp? As far as he knew, though, there was nothing like that in his room, but there was still a chance, and he didn't have any better ideas. Most of what storage furniture was there had been pushed away by the water ball's growth, and what little was left only took about a minute for Shorty to look through. To no avail, it seemed.
Rhett chimed in again. "Holding your breath is just gonna make this take longer, you may as well inhale and get it over with, right?" Shorty rolled his eyes and grumbled a bit, puffing out some more bubbles.
Then, he finally remembered something about the water balls an AquaSphere would make; they eventually wouldn't be able to keep their shape, and the water would return to being fully liquid. The average time was just a few minutes, though the one he was in was far beyond what the machine would normally make, and would probably take longer. With seemingly no other options, Shorty settled on trying his best to relax and hold on until then. He could only hope it wouldn't take too long.
Sitting down on his waterlogged bed, it occurred to him how oddly peaceful it was to hang out in the mostly-flooded room. Of course, there was the issue of not being able to breathe, but if he had scuba gear, he might have actually enjoyed this! Lacking that, he simply held his breath, switching to laying on the bed after a couple minutes. Slowly, he grew more and more nervous, feeling his need to breathe intensifying over time. The sensation aroused him, like it always did, and soon he was fully erect once again, blushing and occasionally bubbling from strain.
Late into the 6th minute, Shorty was really starting to struggle, his bubbling being joined by pained whines as his chest started heaving. While Rhett couldn't see this, he decided to do a bit more teasing. "So, how long are you planning on making me wait? I've got shit to do." Being more concerned about running out of breath, Shorty ignored him, now jacking off in an attempt to distract himself from it. Another minute, and as his arousal built further, closing in on an orgasm, his cheeks expanded to each be about half a foot wide as he internally moaned, accidentally losing some bubbles in the process.
Not too long after, his cock reached its limit, spasming a bit more and starting to spurt cum, Shorty releasing a few bubbles with each one, sort of forgetting the situation he was in. He continued masturbating to prolong his orgasm, and it remained at full force for almost 10 seconds before finally starting to weaken. At the same time, while Shorty didn't know as he wasn't paying attention to the time, he'd gone past 8 minutes! Then, after one last bit of cum was sent out, he finally remembered just how badly he needed to breathe, briefly covering his mouth until he could get himself under control. His cheeks grew even bigger, now about 10 inches in width and looking a bit ridiculous, the earlier purple tint returning to his face.
Normally Shorty would've given up on holding his breath before this point, but it seemed all he ever needed was a bit of peril. With that providing a very good reason to not inhale, he continued pushing himself farther than he ever had before. Whether it would amount to anything remained to be seen, as the water ball he was stuck in showed no sign of destabilizing any time soon.
The 9th minute came and went, with the dino's breath hold now stretching into the double digits, as his cheeks similarly stretched to the 1 foot mark. Rhett was getting bored waiting for Shorty to drown, now, messing with his phone while listening for the eventual bursts of bubbles that would mark his rival running out of breath. Shorty felt that that would be happening fairly soon, his lungs starting to burn. Any semblance of relaxation was gone by now, with him sitting up and covering his mouth, slowly rocking back and forth as bubbles continued to slip past his fingers.
11 minutes, 12... The torturous breath hold dragged on, and Shorty couldn't sit still any more. Instinctively, he bolted from the bed and frantically tried to swim up, bumping his head on the ceiling in his panic. Blue in the face and with 2-foot cheeks, his panic forced him to call for help. "GEBLT MBLE OUBLT, IBL'M GOBLNNA DRBLOWN! PLBLEASBLE!" While this caught Rhett's attention, he certainly had no intention of helping out, even if he'd understood what Shorty had yelled. "Oh, is it finally happening? Sure took you long enough, hot damn!" Momentarily forgetting that Rhett was the one that got him into this in the first place, Shorty swam to the door and started banging on it like earlier, with his absurdly large cheeks pressing against it. "HBLELP! IBL-IBL CABLN'T HBLOLD IBLT!"
This time, with the reduced distance, Rhett could actually make out what had been said. "Help you? Nah. Stick close to the door, I want to hear you sucking down water!" Now remembering how pointless it would be to beg for help, Shorty just went back to doing his best to hold on, spitefully swimming away from the door so Rhett hopefully wouldn't get to hear him drown.
As it turned out, Shorty could keep holding it, even into the 13th minute, but he was in a sorry state. Covering his mouth again, the blue on his face was slowly spreading over the rest of him, and he continuously shivered as bubbles trickled out from his starved lungs. At the same time, his fingers and toes were tingling, beginning to go numb, while his cock was once again throbbing, loving every second of this over-extended breath hold.
He grew increasingly lightheaded, and started repeatedly deflating and reinflating his huge cheeks, rebreathing what stale air he still held. It was quite a large amount, despite all the bubbles he'd been losing, and each time his cheeks inflated they became slightly bigger. 3 feet wide, soon 3 and a half, and even 4 feet, it didn't seem like there was any limit to how big they could get! This strategy seemed like it might be helping, as well; while Shorty started feeling dizzy and tired, the intense burning in his chest was fading, though he'd occasionally be rocked by a hiccup, his body attempting to reject the nigh-useless air.
Of course, this wasn't exactly generating oxygen, and the only reason the urge to breathe was fading was because he was starting to pass out. Shorty's rebreathing slowed more and more, until he was simply holding his breath again, most of his air settling into his cheeks to push them to almost 5 feet wide, his hands slowly falling from his mouth. Bubbles streamed from his lips as he sank to the floor, slowly deflating his ridiculous cheeks. The process took a long time, and it was only in the 15th minute of this almost endless breath holding that the bubbles trailed off. Shorty's cheeks remained somewhat inflated, though now to a more reasonable degree, and he continued to just lay on the floor, briefly drifting in and out of consciousness every few seconds. All he could feel now was a slight pressure in his lungs from what tiny amount of air he had left, and the aching of his cock that continued to throb with his slowing heartbeat.
After some time, his mouth dropped open and his cheeks finally fully deflated, followed by his lungs deflating... Before seeming to reinflate, a cool feeling filling them. It took several seconds for it to occur to Shorty that that wasn't right, and he instantly jolted back to full awareness as he realized what happened. His lungs and throat had relaxed, the last of his air bubbling out and being replaced by the only thing around: Water. After nearly 16 minutes without breathing, he was drowning!
Immediately, he coughed up the water, but had no choice but to gasp down more, even as he grabbed his neck and flailed his legs, before quickly standing up and jumping off the floor to swim again. Once more, he tried to swim up, bumping his head again before starting to bang against the ceiling, his gurgling and choking echoing through the room. While Rhett could faintly hear Shorty drown, he wasn't sure that was what it was yet, but started paying attention again just in case.
Showing no sign of weakening, Shorty frantically swam to a section where there was some space between the edge of the water ball and the nearest wall, and tried to push through it again. It was still pointless, though pressing his face against it gave a brief reprieve from his aquatic gasps, as the water ball's edge partly sank into his wide mouth with each attempted breath. Then, he turned his head away, and just went right back to choking, now returning to the door once again and rattling the handle. He tried to yell again, but in his panic, he couldn't focus enough to actually form any words, just sucking in water and letting out loud, unintelligible gurgles. "HUGLK, GGARGKH! SLRR-HIC!"
Rhett was definitely happy to hear this. "Oh, finally! You sure as hell took long enough!" Shorty paid him no mind; having been drowning for a full minute, he had more important things to worry about than Rhett's commentary. It seemed continually trying to breathe the water was getting him incredibly aroused, and after bucking his hips a few times, he hiccupped as he came hands-free. The pleasure helped get his mind off the pain of drowning, and he jacked off with both hands in an attempt to extend his orgasm, like before. It worked again, and a bit better than last time, leading to him continually shooting cum for about 12 seconds before his orgasm started to taper off, despite how much he was trying to keep it going. Not paying that much attention, Shorty unintentionally inhaled some of his cum as he continued gasping, but it wasn't as if it were any more or less breathable than the water.
There wasn't really much that he could do that he hadn't already tried, but still, he frantically struggled for another minute, banging on random things in the room and occasionally managing to force himself to swallow water instead of inhaling it. The water he drank didn't amount to much, and it added up over time, slowly bloating out his stomach. Mercifully, the lack of oxygen was finally starting to calm him down, his choking and gagging becoming occasional instead of constant, before stopping entirely, no longer really having the energy to struggle. At this point, Shorty's entire head was a deep blue, and even the rest of his body had a subtle blue tint.
As his mind dulled, he started to forget what the issue was. Nothing in the water ball was floating, and he no longer noticed the parts that weren't pressed against a wall. With both those combined, Shorty entirely forgot he was underwater! His waterlogged mind attributed the dizziness and hiccupping to him just being drunk, and he stumbled over to his bed and sat down again. "Ggah, fffuckh...thhehell wwa-hic-was I..." If he were still coherent, he would've marvelled at how clearly he was talking underwater. Right now, he was a bit confused, since he didn't remember drinking, nor the events of the past half hour. Clearly he had been drinking, though, since his belly was noticeably bigger than normal. Right?
Another hiccup, and he realized he was erect. "...Nmh...wwhatevvuh...", he forced out, and started masturbating, even though he'd already came just a bit over a minute ago. For another entire minute, he'd weakly breathe water and jack off, gulping every few seconds and continuing to expand his belly, and sometimes briefly losing consciousness, eyelids fluttering. Eventually, as his vision faded, a wave of euphoria washed over Shorty, and while he hadn't cum yet, he believed he did, even hallucinating a few especially powerful shots of cum that would splatter several feet away. "G-guuaaaghhh..." He moaned as much as his waterlogged body could, head leaning back and tongue hanging from his mouth.
Coming down from his "orgasm", Shorty felt exhausted. The blue of his body was obvious now, and it looked as if he'd swallowed a beach ball, but he paid both of those things no mind, too drowned to care. It was nothing short of a miracle that he was still awake at this point, and he'd remain that way a while longer, a dopey open-mouthed smile on his face, still taking some gulps every now and then...

Rhett, a greenish-brown anthro brachiosaur, looked back at his phone, bored once again. He had not expected Shorty to last anywhere near this long, but now that it had been a few minutes since he'd heard their struggles, it was likely over. I swear, if he's somehow still alive in there... Rhett pulled aside the furniture he'd set up to block the door, stood to one side, and turned the handle. The door was pushed open by the water ball, which bulged a couple feet out of the room, but the water didn't flood outward. Damn, I was hoping it would clear out. He needed to go in there and get the AquaSphere and his note, they were evidence. Sighing, Rhett undressed, soon standing nude in front of the doorway. Surely he'd be able to get out easily, because if those open sections in the corners had been like that the whole time, this would've taken way longer.
With a deep breath, Rhett ran and dove into the water ball, and landed on his front inside, puffing his cheeks. He couldn't swim, and always had to just walk on the bottom, but that would hardly matter here, it likely wouldn't take more than 30 seconds to...
Shorty was still awake. He was just sitting on his bed with a blue body and huge stomach, staring off at nothing, seemingly enjoying himself despite clearly being fully drowned! "Hblow thble fublck!?" Rhett blubbed, and Shorty glanced over at him. It didn't seem like he recognized Rhett, or even fully took in that they were there, and he just stayed where he was, another hiccup rocking him somewhat. Okay, he's drowned out of his mind, it'll be fine. Rhett swimwalked to the AquaSphere and grabbed it, taking the note with him as well after a brief search for it, and went back to the door, looking over at Shorty again. It seemed his was finally out of energy, as he'd leaned backward to lay on the bed with his legs over the side, having gone motionless.
Night-night, jackass. Rhett smirked, and stepped out of the water ball... Except, he didn't, the edge of it holding him back. Of course it can't be that easy, ugh... He pressed up against it, but still, it wouldn't let him out. Setting down the machine, he grabbed the doorframe and yanked himself forward, and even that didn't work. ...Fuck. He'd gotten himself in the same trap he'd set for Shorty!
Releasing the note as well, he tried to grab the water ball's edge, but it kept slipping out of his hands. Then, getting an idea, he went through the doorway and attempted to close the door, thinking it might cut off a smaller part that would then just turn liquid, freeing him. It took a lot of effort, as he struggled against the force of the water ball trying to spread out, but eventually it suddenly got much easier as the water was divided! Rhett was knocked backward by the sudden lack of resistance, and...
...Nothing happened. He was still stuck in a water ball, albeit a much smaller one that wasn't much bigger than him. "Oblh, coblme obln!" Now what would he do? He'd already found that these water balls were way more durable than he thought, so there was nothing he could do from inside. But, what about something outside? Maybe something sharp could pop it! While Rhett wasn't very familiar with the layout of Shorty's house, it had to have a kitchen, and surely a fork or knife would be a big help. Pushing against the edge, he was able to move the water ball, but the weight of all the water made this a slow process, only managing to cover a few inches a second. Still, it was better than nothing, and he'd keep at it for as long as it took.
It certainly did take a long time, and a lot of energy. For minutes upon minutes, the water ball and its captive dino progressed through the house, finding wrong room after wrong room. He'd held his breath for 4 minutes by now, and with all the effort draining his oxygen, he was already straining and blushing. For whatever reason, he'd gotten hard as well, though he tried to ignore that for now.
Another wrong room, 2 more minutes of backtracking, and finally the kitchen had been found. Not a moment too soon, as Rhett's cheeks were already almost a foot wide. A few more shoves got the water ball to the counters, and after a few attempts he got a drawer open. Nothing useful was in it, so he checked another, and another... A minute went by, and every drawer but one had been looked into. This is so stupid. I almost don't want to find anything in here. For better or for worse, he'd at last found the cutlery drawer, and as his lungs were just starting to burn, he was eager to finally get a fresh breath.
While he hadn't considered the potential difficulty of holding something on the other side of the water ball's slippery surface, he only ended up dropping a couple forks on the floor before he got it down to a decent degree. Carefully, he set a fork upright on the counter, and pushed the water ball down onto it, leaning back a bit to avoid potentially being stabbed if the fork suddenly went through. That didn't happen, but instead the fork slipped and fell to the floor. Clearly there needed to be some kind of grip, and while the forks were entirely metal, the knives had handles made of some other material.
Rhett's lungs were getting impatient, and demanding he hurry this up, so he tried to just quickly grab a knife, which didn't work, so he had to continue taking it slow. It wasn't long before he had one set upright, and he pressed the water ball's edge down onto it like before. And, it slipped and clattered to the floor again. "Fublck ofblf, Ibl wablnna brbleatblhe!" This wasn't going to work, and all the time Rhett had spent finding the room was a waste.
Another idea quickly came to mind: He couldn't drown if there wasn't any water. Carefully sucking the air in his large cheeks back into his lungs, he opened his mouth and started gulping. The water tasted alright, but there was a lot of it, and while he likely wouldn't be able to drink all of it, he'd just take in as much as he could and hope that would be enough. As his drinking continued, his belly expanded with the excessive amount of water, and he started shivering from the lack of oxygen, blush turning purple.
After 9 minutes without a breath, and with his stomach being several feet wide, Rhett started having more and more difficulty swallowing. Eventually he needed to force it down in loud, strained gulps, and even that soon came to a stop. There was still a significant amount of water around him, but he couldn't bring himself to take in any more, and that was the end of it. Of course, with his face turning blue and cheeks inflating to be a couple feet wide, his body seemed about ready to start bringing in even more water whether he liked it or not.
Grabbing his neck, Rhett would've doubled over were it not for his packed belly, but still did some rebreathing like Shorty had, as his chest heaved and belly wobbled. Something about all this was oddly hot to him, make his cock throb harder and harder until he came hands-free, inadvertantly expanding the water ball slightly. He gasped in surprise, then coughed up a cloud of bubbles and gripped his neck harder. That cough almost entirely emptied his lungs, to the point where he couldn't even puff his cheeks, and just a few seconds later he gasped again. This time, without enough air to cough it back out, the water settled into his lungs, and his breath hold was over.
Another cough brought up just a few tiny bubbles, and the one following his next gasp had none at all, nothing but water being forced into and out of his chest. He managed to keep standing, and covered his mouth in a pointless attempt to not breathe, puffing his cheeks again with the water in his lungs before exhaling again. Loudly choking, Rhett pushed against the water ball to move it, going noticeably faster as a lot of its prior weight was sitting inside his stomach. While he wasn't really sure where he was intending on going, he felt he had to at least do something.
Before long, he'd moved to another room, but there was hardly any point as it still didn't have anything sharp in it. Again, he held a breath of water, frantically looking around for anything that could help before he started working on going to another room again. It took longer this time as his strength started to fade, having been drowning for over a minute, but still, he eventually got there. Once more, there was nothing helpful, and Rhett exhaled the water he'd been holding. Feeling incredibly dizzy, he soon fell to the floor, and seemed to now be lacking the coordination to get back up.
Trembling and hiccupping, his body, desperate to keep more water from flooding his lungs, forced him to start swallowing again. Apparently he hadn't reached his limit before, but how much could his stomach truly hold? Giving into the urge to gulp the water, Rhett resumed chugging down his aquatic prison, though water would often slip into his airways regardless. His packed belly continued expanding, and the water ball kept shrinking, until he was finally truly at capacity. It was a ridiculous sight, to be sure; his belly was wider than he was tall, and it looked more like he was attached to it, instead of the other way around! Yet, for all that desperate drinking, all he'd accomplished was shrinking the water ball to the point where it only covered his head, still keeping him from the air he so badly needed.
All Rhett could do now was lay almost still on the floor, with so much added weight from all the water he drank that, even if he were at his full strength, he likely wouldn't be able to stand up. Slowly, he continued breathing the water around his head, visibly expanding and contracting the ball of it. His cock had gotten erect again, but it didn't seem he'd be having another orgasm. With his consciousness and heartbeat both fading, he took in one more watery breath and held it, eyes rolling back as his vision dimmed...
Suddenly, the water around his head dropped away, the water ball finally no longer being able to hold itself together. Rhett was somehow able to comprehend that, and as water trickled from his mouth and nostrils, he inhaled. At least, he tried, but his lungs were already completely filled with useless water, and it didn't occur to him to exhale beforehand. While he did figure it out, by then he didn't have the strength to force the water from his lungs. If he'd done that first, he likely would have survived, but as it stood, he finally lost his consciousness, soon followed by his life.

Back in Shorty's bedroom, nothing had changed. Shorty himself lie drowned and dead on his bed, the room still mostly flooded. About half an hour later, the giant water ball finally broke, sending water flooding through most of the house and pushing Shorty's body a distance as well, out into the room right outside his bedroom. It wasn't as if it made any difference at this point, both him and Rhett were long gone by now.
In a way, Rhett's "gift" had ended their hatred of each other after all.