4 dudes in a bubble

"Fine, um... Fuck Chomper... Marry Littlefoot... And, I guess kill Shorty."
"Wait, are you serious about marrying me?"
Rhett, Littlefoot, and Chomper were on a hike together, though they were currently taking a break. Shorty had come with them as well, but was off preparing a "surprise" for the others at the moment.
Rhett: "No, obviously! This is why I hate that Fuck-Marry-Kill thing, everyone takes it too damn seriously."
Chomper: "I bet you're only saying that 'cause you got called out on it, you'd totally marry him."
R: "No I wouldn't, shut up!"
Littlefoot: "But, you said to me before that y-"
R: "Damn it, man, don't tell him that!"
C: "Haha! You totally would, wouldn't you?"
R: "Ugh, for fuck's sake... Where the hell's Shorty? I want to get going so we can stop talking about this crap."
L: "Yeah, he's taking kind of a long time... Any idea what that "surprise" he mentioned is? I'm kind of excited to find out, he's been hyping this up for a while!"
C: "Well, he hasn't told me anything about it."
R: "Haven't got a clue. It's been kind of annoying, honestly, him constantly going on about it."
C: "...You know what? I'm gonna go check on him, I don't care if it ruins the surprise, I'm getting kind of worried."
R: "Knock yourself out. Whatever this thing's gonna be probably isn't worth the hype anyway."
Chomper went off in the direction Shorty had gone, leaving Rhett and Littlefoot on their own.
L: "...Sorry I kind of outed you as being into me."
R: "Don't worry about it, they were bound to find out at some point."
They waited in silence for a while, and eventually Chomper returned in a full sprint!
R: "The hell is-"
C: "SHORTY'S IN TROUBLE!"
Littlefoot jumped to his feet, though Rhett took a bit. "I'm gonna be pissed if this is another prank, you know," he said. "IT'S NOT, HURRY!"

At last, Shorty's plan was complete, and his friends were in the perfect position! Ever since the four of them had gone swimming together and seen who could stay under the longest (which was found to be Littlefoot), Shorty had been utterly obsessed with seeing his friends struggling to hold their breath. He'd find any excuse he could to get to watch, sometimes even helping them practice so he could get right up to them without being suspicious, being almost hypnotized by the slowly growing convulsions of their chest.
Slowly, though, Shorty's desire had changed. He often fantasized about any of the three drowning, jacking off to the thought of their faces turning a deep blue as they repeatedly took deep gasps of water... Eventually, he just had to see it for real, and luckily, he happened to have something to make that possible. A bubble-making machine he had for a reason he didn't remember could, via some mechanism he didn't understand, make giant bubbles that could easily be entered to play around in. Through some testing, he found that if its air intake was submerged (ignoring the warning label specifically saying not to do that), it would make giant water bubbles instead, which would be perfect!
Arriving at a large pond, Shorty retrieved the bubble machine from its hiding spot in a nearby bush and flicked its switch to make sure it was still working after being left out for so long. Relief washed over him as a bubble began to form from the nozzle, then he turned the machine off again and swatted away the bubble. Then, he set the machine down in the water and turned it back on, a water bubble forming this time. Shorty happily poked at it a few times as it expanded, watching it wobble about, then pulled it off when it was about the size of a soccer ball, another appearing and starting to expand right after.
The whole process was rather slow, so Shorty passed the time by messing with the water bubble he was holding, squishing it around and tossing it up and down. Eventually, he accidentally dropped it, the bubble hitting the ground with an amusing splat as it momentarily spread out before returning to its normal shape. Picking it back up, Shorty heard the bubble machine starting to make unpleasant-sounding noises... Clearly being forced to work with water instead of air was doing a number on its internal mechanism, and it was probably going to end up broken soon. The bubble it was making would likely be enough at this point, starting to be bigger than Shorty, but he wanted it even bigger, and could only hope the machine wouldn't break down before that point...
A minute or so later, with the big water bubble now towering over Shorty, a grinding sound came from the bubble machine before it went silent. Dumb thing... At least the bubble's plenty big! He tossed the smaller bubble he was holding at the larger one and it was absorbed inside, though not making any noticeable difference to its size. Now, all he had to do was give it a good push, and the slope back down to where his friends were would take care of the rest! He could hardly wait... Soon, he'd be watching Rhett, Littlefoot, and Chomper smacking at the bubble's membrane as they choked on the water, maybe even cumming into the bubble just before they'd pass out.
With a throbbing erection, Shorty walked around to the opposite side of the bubble,  pushing against it, but couldn't seem to get it moving. There was a lot of water in it, so it would take an equally large amount of effort to move it. He kept trying, pressing his back against the bubble as pushing as hard as he could-
schlup!
He suddenly slipped through the bubble's membrane! "Wabl-MM!" Shorty covered his mouth and puffed up his cheeks. He'd gotten himself stuck in the bubble meant for everyone but him! Even worse, with his lungs not completely full, and him being already somewhat out of breath from all the pushing, he wouldn't be able to hold his breath anywhere near as long as normal. He'd eventually start breathing again, whether he liked it or not, and he'd be making damn sure that what he'd inhale would be air.
"MM-MMM!" Shorty tried everything he could think of to get out or pop the bubble, swimming against one side, grabbing at the membrane to try to tear it, even trying to bite it a few times, but nothing worked. Already his lungs were aching from all the wasted effort, and his cheeks were getting bigger, but now, he had an idea. If he could get the bubble moving down the slope, it would roll all the way to his friends, who would hopefully get out of the way, and could then help him escape! He'd have to quickly come up with a way to explain how he'd gotten stuck in there in the first place, but there wasn't time to worry about that right now.
Pressing against the side of the bubble facing the slope, Shorty pushed as hard as he could, over and over, but even this didn't seem to be working... He gave up on trying to escape, and simply sat down to save energy and oxygen. Eventually, one of his friends would come to check on him, and he knew that. If he could just survive until then, even if he passed his breathholding limit, they'd almost certainly be able to get him out!
After several minutes of this, his lungs started burning. "Mmrgh...Hrk..." Another couple minutes, and his face began turning blue. "HM-BLBLK!" Shorty pressed both hands against his mouth and started trembling, his cheeks now looking like they each held a watermelon inside, and his dick aching in arousal. One more minute passed, and it was finally too much for him. Bubbles streaming from his lips, Shorty swam up to the side of the big bubble again, pounding on it once more and yelling as loud as he could!
"HEBLELBEL-HHUUUUUUAAP!"
His bubbly scream for help was cut off, however, as Shorty's lungs finally gave up and forced down a deep breath of water! The sudden intense burning in his throat and chest overwhelmed him, and he was stunned for a moment, going still and puffing his cheeks as he held in the water he'd inhaled. He floated in this state for a couple seconds, before his mind finally caught up with what was happening, and he fully realized what he was now holding in his lungs.
"GHURGLK, HUUUAA! KAGURGL, GHUUAA!" Again and again, Shorty would hack up the water from his lungs, just to suck more back in despite clutching at his throat. With each gurgling choke, there were fewer and fewer bubbles, and his cock throbbed harder and harder, until after about 20 seconds, when the bubbles stopped and Shorty came hard, spurting cum into the water as he thrashed about.
Coming down from his orgasm, and having been drowning for 30 seconds, he managed to regain some of his composure and swim against the bubble's membrane once again, resuming in giving it a good beating as he tried to be as loud as his waterlogged lungs would allow. "GLG, HUUELP! S-SOME-HICP-ONE HEL-KHK!"
After a couple minutes of Shorty's gurgling yells and assault on the bubble, the pain in his chest finally started to dull, along with his senses, though he'd still occasionally choke or hiccup, his body jolting each time. He clung to consciousness as best as he could, hoping-
"W-WHAT THE FUCK!?"
Chomper had found him! Shorty would be out of that bubble in no time! "Chkh, Chompuhh...Ghellp..."
"G-give me your hand, I'll try to pull you out!"
It was pretty hard for the two of them to keep their grip, with how slippery the bubble's membrane was, but they managed it, and Chomper pulled as hard as he could, slowly stretching out the bubble. But, it seemed to be determined to keep Shorty inside, and the more it was stretched, the harder it fought back... Eventually, Chomper lost his footing, and with how short he was, he got pulled back with it, slamming against the membrane, though thankfully not passing through.
Clearly, just pulling wasn't going to work. Chomper stood for a moment, mind racing as he tried to figure out what to do... Before turning and running back the way he came! "I-I'M SORRY, I'LL BE BACK!"
"Nnuhh, d-don't-glp-ghuh..." Shorty tried to tell him to stay, but they were already gone. Now alone again, he could feel himself slowly falling deeper into his drowned stupor, eyes rolling back as it started to become tempting to just let himself pass out... He HAD to stay awake, though! Shorty rubbed his purple-tinted body, trying to focus on the sensations of it, eventually settling on jacking off despite it not having been that long since his previous orgasm. That certainly did the job, and while he now wasn't having trouble staying awake, he could still feel his strength very slowly draining away...
"Mmgh...ggrgl...hic..."
All things considered, it actually felt a fair bit better than Shorty originally thought it would, moaning in pleasure as the cool water slowly flowed in and out of his lungs. If this was how he died, he wasn't sure he would really mind that much...
One more minute, and Chomper returned, bringing Littlefoot and Rhett with him.
R: "Holy shit, you were serious!"
C: "Yeah, OBVIOUSLY! Get over here and help me pull him out!"
L: "Don't touch that thing, what if you get pulled in!?"
C: "Well, do you have a better idea? Come on already!"
"Tuh...takhhyurr...hicp!" Shorty tried to gargle to the others to take their time, but hiccupped partway through, then promptly forgot what he was going to say.
Now, with Rhett and Littlefoot holding Chomper by the legs, and Chomper holding Shorty's hand (as hesistant as Shorty was about escaping at this point), they could pull with much more force. So much force, in fact, they started to slightly drag the water bubble as they stretched it out... Eventually, a disastrous sequence of events was started; Rhett adjusted his grip, causing Littlefoot to suddenly have the full force of the bubble's resistance on him alone, losing his own grip and sending Chomper launching forward as the bubble snapped back into its regular shape, and...
SCHLUP!
Now Chomper was stuck in the bubble, too!
L: "CH-CHOMPER!"
R: "Shit, SHIT! What do we do now!?"
The situation had just gotten way worse, especially since Chomper couldn't swim, banging on the bubble and calling for help. "GEBLT MBLE OUBLT! IBL DOBLN'T WABLNNA ENBLD UBLP LIBLKE HBLIM!" Shorty was in no state to offer any help, panting water heavily and aimlessly paddling in place as his coordination began to suffer.
R: "Look around! There's gotta be something we can use to get them out, or break the damn thing!"
Off the two went, looking for anything that could be helpful, leaving Chomper and Shorty alone. Knowing that Shorty could somehow still talk, Chomper couldn't resist asking him something. "...Whblat's iblt feblel liblke, drblownbling?"
"...sssorrtuff...nnicce...you...ulk...yyoushhould...t-tryh..."
"Nbl-nblo thblankbls."
"huhh...huhuhhh...wwusss..." Shorty then resumed jacking off, making Chomper feel quite awkward as he tried not to make eye contact. Clearly, Shorty's inhibitions had been dulled from his drowning, and Chomper could only hope the others would hurry up so he wouldn't be alone with this weirdo much longer.
Finally, Rhett and Littlefoot came back, each with an armful of rocks. "We're gonna try to pop it by throwing these at it!" Rhett explained, the two of them dropping the rocks to the ground, then each taking one at a time and launching them at the bubble. It didn't seem to be doing a whole lot, just making a sort of blun sound with each impact. Chomper held his nostrils shut as he started having a bit of trouble with his breath, though thankful that Shorty had stopped masturbating for the moment, currently just sitting down with a dopey smile on his deep blue face.
Rhett and Littlefoot threw the last of the rocks from the pile, the others now strewn about the area, not having accomplished anything. Not wanting to leave their friends again, they tried to think of something else they could do...
L: "I got it! Rhett, get to the left side, I'll take the right and we'll pull it apart!"
R: "I-is that really gonna... Fuck it, we have to try!"
The two gave it a shot, pulling on opposite sides of the bubble to try to pop it that way. It stretched farther, farther... Then, Rhett happened to step on a loose rock that had bounced off the bubble previously, sending him off balance and being pulled toward the bubble, then into it! At the same time, Rhett not pulling any more caused the bubble to suddenly lurch toward Littlefoot, trapping him inside as well!
Now, with all four of them in the water bubble, things had gotten even worse. None of them had gotten a good breath before being pulled in, Chomper was already struggling, and Shorty was just laying on the bottom, watching the others as weak hiccups rocked his rather blue body. Rhett started hitting the bubble like Chomper had, though Littlefoot didn't bother, knowing from when Chomper had tried that it was pointless. Plus, he had a better idea, motioning for Chomper to come over and help push the bubble, which Rhett quickly joined in on. With a ton of effort, and certainly no help from Shorty, they managed to get it very slowly moving.
Shorty, meanwhile, was actually quite enjoying the others' struggles in spite of his own. This was almost exactly what he'd wanted what he made this bubble in the first place! Hell, it may have even been better, with him getting a much better view of his friends than he'd expected, though he'd prefer to not be, you know, drowning. He wanted the others to be drowning instead, and he wasn't going to let himself pass out before that happened, so he decided to take matters into his own hands. Struggling to his feet, Shorty managed to get over to Chomper, wrapped his arms around their belly, and squeezed as hard as he weakened muscles could.
"mmMBLALBLABL!" Success! Shorty had managed to force out most of Chomper's air, then fell over to conserve his draining energy.
"Shblortbly, dobln't!" Littlefoot glubbed, grabbing a panicked Chomper to share some air with him, to Shorty's frustration. What a waste of energy that had been... He decided to just wait a while, hoping he wouldn't pass out before noticing another opportunity.
Another minute passed, then another, and now Rhett, Littlefoot, and Chomper were all struggling to hold their breath as they continued slowly pushing the bubble. Rhett in particular, however, had gotten some rather sizeable cheeks that clearly had quite a bit of air in them. As heavily drowned as Shorty was, he somehow found the strength to stand up once again and stumble over to Rhett, then squeeze their cheeks to force out the air in them. Rhett tried to grab at the bubbles that resulted, though they all slipped between his fingers. Suddenly, Littlefoot shoved Shorty backwards! "Urglk!"
"Cublt thblat oublt!" Littlefoot was getting mad, now, once again giving up his own air to Rhett, before turning back to Shorty. "Whblat thble hblellbl's goblttebln inblto y- rk!" He grabbed at his neck. With all the air-sharing and bubbletalking, he'd completely emptied out his lungs! Shorty smirked, and started jacking off again as he watched Littlefoot's chest jolt back and forth, just seconds until they'd inhale. Littlefoot's mouth repeatedly opened and closed like that of a fish, with no bubbles coming out, but eventually, something else went in.
"HUUAA-GLK! GUKH!"
At last, Shorty wasn't the only one drowning! And, shortly after Littlefoot inhaled, Chomper gasped in shock, coughed hard, then gasped again, and now he was drowning, too! Not long after that, Shorty had a second orgasm, finally getting to watch his friends drowning sending him over the edge as he spurted out another load of cum. His strength was quickly draining after that, but he was satisfied, now. Closing his eyes, Shorty let go of his consciousness at last, falling into a thoroughly-drowned sleep with a slight smile still on his face.
"Nblo, NBLO! DOBLN'T BRBLEATBLHE!" Rhett bubbled out, panicking as his friends choked on the water they were trapped in. Littlefoot actually managed to stop his aquatic gasps for a moment, holding in a breath of water and puffing his cheeks, though Chomper was in too much pain to really pay attention, writhing on the bottom of the bubble as he choked and hacked, face quickly turning quite a bit more blue than it normally was. Clearly it was up to Rhett and Littlefoot to get everyone out of the bubble.
Seeing a low tree branch nearby, Rhett tried to push the bubble toward it, but wasn't strong enough to do that on his own. "Hblelp mble oublt, hblere!" he bubbled to Littlefoot, though already aware that they likely wouldn't be much help in their state, having gone back to repeatedly coughing and gasping. Sure enough, even together they couldn't get the bubble moving any more. Chomper certainly wouldn't be able to join in, just laying on his back and panting the water with a distant expression.
All that could really be done, now, was for everyone to try to hold on as long as possible, and hope that someone would find them in time. Accepting that Chomper was likely a lost cause, Rhett ignored him and sat down with Littlefoot, focused on helping stay conscious. With their gasping slowing down and a somewhat sleepy expression on his face, it seemed like it would be a fairly tough job, but Rhett wasn't about to let them die. Despite his growing urge to breathe, he spoke. "Foblcus obln mble, Liblttlblefoblot. Webl're goblnna geblt oublt oblf thblis, jublst stblay awblake."
"Ghlk...Rr...ett..."
One more minute passed, with Rhett's cheeks having expanded somewhat and turned purple, and Littlefoot slowly breathing the water. Chomper, meanwhile, had gone mostly blue and still, though strangely, fully erect. Suddenly, he shot back to awareness, gurgling loudly as his body fought back against the water one last time. "GAKH! HUGLAK, KHK!" he went, cumming hard at the same time. Rhett and Littlefoot watched his struggles fairly quickly slow down, then come to a stop, Chomper's eyes still sleepily open as he succumbed to the lack of oxygen just like Shorty had.
Littlefoot looked back at Rhett for a moment, before his eyes started to roll back. Rhett rubbed Littlefoot's hands to wake him up, although it didn't work for long, their head starting to droop-
Smack! "Blk!" Rhett had slapped Littlefoot in the face! "Dobln't fabll asbleep, yoblu miblght noblt wablke ublp!" Littlefoot had successfully been brought back to awareness for the moment, though he still looked rather drowsy. Remembering the situation, Littlefoot struggled to stand up, stumbling over to an edge of the bubble and starting to hit its membrane. "hhh...hhellp...nnn...n-nneeedh airrr..." After just a few seconds of that, he fell over backwards, still swinging his fists at nothing as he started to pass out again.
Smack! Another slap! This one, though, barely even made Littlefoot twitch, he was so utterly exhausted. "NBLO, WABLKE UBLP!" No response. Rhett had to think of something quick, or his friend would die! Then, noticing Littlefoot's dick was hard, he knew exactly what to do, reaching over and starting to stroke it. "Hmk! Hic, nmmuuhh..." That certainly did the trick, Littlefoot forcing himself to stay awake as he now had a pretty good reason to do so. "Thblat's iblt, foblcus -hmrk- obln thble plbleasblure..." Rhett glubbed to him, even though he was starting to close in on drowning, himself.
Another 30 or so seconds passed, and Rhett's own growing arousal convinced him to take things a bit further, shifting to giving Littlefoot a blowjob instead of just masturbating him, while also jacking himself off. "Mgh, huulp! Hic-glp!" Littlefoot was loving this, weakly humping at Rhett's mouth as his purple tongue hung from his mouth. Rhett, too, was managing to enjoy himself, even though his lungs were starting to burn as his face turned blue. Eventually, Littlefoot's gurgled moans began getting a bit louder, as his humping got a bit more force behind it, until...
"Mmmmgluuuuuhhhhh!" A load of cum was sent into Rhett's mouth as Littlefoot came, and Rhett couldn't really be bothered to do anything but gulp it down. Struggling to reach an orgasm himself, he felt nothing of his friend's pleasured shudders coming to a stop... At least for a few seconds, before he realized he couldn't let Littlefoot pass out! Rushing over to Littlefoot's head, Rhett discovered he was already too late. Littlefoot was unconscious, just like the others still stuck in the water bubble with him. "Nbl-nblo, gobld DABLMN IBLT!" Now completely alone, all Rhett could do was sit there and focus on holding what was left of his breath.
And, hold it he did, lasting far longer than he ever thought he could. Two minutes passed, and he pressed his hands tightly against his mouth, cheeks beginning to rival his head in size as his lungs fiercely burned and he shivered uncontrollably. Yet, he somehow managed to hold himself shut even past that! Eventually, as he pushed his desperate lungs further and further, he started to feel a numbness begin to spread from the tips of his fingers and toes, and an extreme dizziness take hold over his head. Losing feeling in his blue-tinted body, however, also meant that Rhett felt his urge to breathe actually start to lessen! He certainly still badly needed to breathe, but it got easier with every second to resist doing so, his cheeks deflating to a more reasonable size at the same time. There was no way he would give up, his friends needed him! As he started feeling drowsy, he could almost hear Littlefoot's voice...
"You really ought to try out drowning!"
...Except, he actually could hear him, saying something weird... And see him moving, too! Unknown to Rhett, he had so little oxygen left in him that he'd started to hallucinate, and Littlefoot wasn't the only one that seemed to be alive again.
Shorty: "Come on, just a quick gulp! You saw everyone else cum when they drowned, it's obvious how good it feels!"
Chomper: "It was just the huge amount of pleasure making me freak out, you know. It was practically a sensory overload, but man I'd love to do it again."
Rhett nervously looked around at what he thought were his friends, before shaking his head.
Littlefoot: "You're gonna just pass out soon, this is your last chance!"
S: "Hang on, I know what to do..."
Shorty walked over to Rhett and tried to pry his mouth open, which Rhett covered with one hand while smacking Shorty away with the other, which he then also pressed to his mouth. "Open up, damn it! Guys, give me a hand with this." Littlefoot and Chomper came over and helped push Rhett down, pulling his hands away from his mouth with some difficulty, then kneeling on his arms to pin them in place. Rhett whimpered as Shorty loomed over him and tried again to open his mouth, but Rhett shook his head from side to side to keep Shorty from getting a good grip. "Fuck's sake... Hold his head for me, we've just about got him."
Littlefoot and Chomper both grabbed Rhett's head to keep him from moving it, making it relatively easy for Shorty to open their mouth. Even then, though, Rhett just didn't inhale, and he knew that none of them could force him to.
S: "Ugh, just breathe already! Anyone got any ideas?"
C: "Yeah, don't know how we can make him inhale..."
L: "He doesn't have to breathe, we can just force water into him. Shorty, keep holding his mouth open, I got this."
Littlefoot took a deep breath of water and held it a moment, puffing his cheeks as he leaned close to Rhett's mouth, then blowing water into it, Rhett hearing a faint gurgling sound as he did.
C: "Oh, nice, I didn't think of that!"
S: "Good work! He'll be feeling that any second-"
"URGLK!" Rhett's hallucinations dissipated as he shot out of his stupor, realizing he'd gotten water blown into his lungs! Though, what had really happened was that he'd laid down and opened his mouth, and eventually, his throat, and the water simply poured into him. It made no difference in the end, and Rhett thrashed about as coughed out what air he had left, just to gasp down more water. Similarly to what Chomper had, he had an orgasm as his body flooded, but he tried to ignore it as he swam around the bubble in a panic, looking for anything that could be even slightly helpful. "HAK! GURGLK! HUUAAGH!" A minute of loud choking went by, and Rhett's already exhausted body started to give out, leaving him unable to swim and simply sinking to the bottom, taking shallow breaths of water as he landed on his back.
As he laid there, no longer feeling the pain of drowning, Rhett actually started to feel quite nice. The numbness of his blue body made it feel as if he were floating on nothing, surrounded (and filled) by coolness... Soon enough, he started hallucinating again, seeing Shorty standing over him. "Told you you'd like it! If you'd just listened, you'd probably have been able to enjoy this a lot longer, but, oh well."
Littlefoot and Chomper were there again as well. "Even though you had to be forced into it, I'm glad you had a good time," Littlefoot said. "We should do this again some time!" Chomper added.
Rhett: "...thh...annkss...ghuysss..."
S: "Come on, let's give Rhett a nice ending to his first drowning."
Shorty, Littlefoot, and Chomper all laid next to Rhett and gave him a group hug, cuddling with him as he finally let go of his consciousness, falling into an aquatic sleep from which he and his friends would never wake.