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Pool Switch

By Cimmaron Spirit

Commission for Friday Otter

WARNING: this story contains: muscle growth, height growth, cock growth, muscle shrinking, height shrinking, cock shrinking, making out, oral sex, anal sex, mind/reality alteration and more. If you aren't 18 or this doesn't interest you, then begone! Otherwise, enjoy!

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"Happy Birthday Alec!"

The blue coloured box that the lithe, chestnut coloured horse held out was tiny, only about three inches cubed, with a massive, garish bow on the top that really stood out.

"Trevor, my birthday tomorrow," the otter replied, wrapping his beefy arms around his boyfriend into a massive bear hug, making the pony squeal in surprise, devolving quickly into laughter as the muscle bound otter lifted his boyfriend into the air and spun him around a couple of times.

Side by side, the two looked worlds apart. Alec the otter was six and a half feet of muscle, with biceps bulging with veins and power that couldn't be contained by shirt-sleeves, thighs that made even the grey sweatpants he was wearing look like they had been painted on, broad shoulders with equally wide trap muscles that made his neck even wider than his head, pecs with a thick tuft of fur in the middle that was exposed to the world, and a long, thick tail that could dent steel and crack wood if he turned around too quick, and quick, darting brown eyes that were constantly seeking, inviting a challenge, an easy smirk showing off his pearly white teeth to prove his dominance and might. He was big, powerful, and he knew it, and loved it.

Trevor, on the other hand, was a twink compared to the jock: almost a full foot shorter than Alec, with almost next to no muscle definition: twigs and sticks compared to the logs and boulders seemingly shoved under Alec's fur. The clothes he wore: the t-shirt with some band name and a pair of short-shorts, hung loosely on his body, flapping with the slightest breeze. The clothes, along with the painstakingly trimmed and rainbow dyed tail and mane, easily accented the few assets he did have, namely a round, perky rear that had seen more than its fair share of work, and shimmering blue eyes that dazzled like diamonds.

The only thing the two shared was in their pants: the comfy sweats on the otter and the insanely low cut shorts on the horse were both packing eight inches, with the otter's being a bit thicker, and the stallion with a bigger pair of balls, but otherwise it was a wash.

"I just really, really wanted to give this to you," Alec said with a giggle, his muzzle buried in the bush of brown fur between the otter's pecs. "And I didn't want to wait till tomorrow!"

"Heh, fine then," the otter said as he set the much shorter horse back down on his hooves. Alec tilted his boyfriend's head up and their muzzles locked into a passionate kiss, and the otter slipped the early birthday present from Trevor's hands into his own webbed ones.

They pulled apart, as the otter began to fumble with the ribbons that held the box and it's over-decorated lid together, before finally getting into the content inside.

Inside was a necklace, a golden amulet in the shape of a crescent moon, with a blue gem along the edge, attached to a long black string to be worn around the neck, with the open end pointed to the left.

"Well this is nice," Alec replied, looking over it, before putting it on, with the amulet just landing south of his chest fur. He never was much for jewelry, but, hey, for his boyfriend, he'll wear it.

"It's the pair for this one!" Trevor exclaimed, reaching into his shirt to pull out a similar necklace, only with the open ends pointing to the right. "See what happens when you link 'em up like... this?"

When the two gem's touched, the two crescent moon's fitting into each other, there was a little electric shock that transferred to both of them.

"Ouch!" Trevor exclaimed, while Alec nearly jumped from the sudden zap.

"Stupid static," Alec grumbled, as he felt his body tense a bit. The feeling didn't really go away though, the little sticky, stiff feeling you get when shocked. It wasn't enough to really affect anything, but it was noticeable.

"Eh, it happens... especially when my boyfriend is shockingly hot," the horse said with a giggle, trying to hide his own uncomfort with the static shock he got.

Alec chuckled. "Well, the nights still young, the pool will be just the right temp... let's go for a dip." Trevor didn't need to be told twice, as he pulled off his t-shirt and undid the buttons on his shorts to show off a bright red speedo, before helping Alec with his sweats, managing to get a quick grope of the otter's own green spandex covered bulge.

"Someone is excited," Alec chuckled, before scooping up the smaller horse and carrying him out the back door to the inground pool that seemed to be pre-requisite for an otter's home. It was big, taking up over half the backyard, and the cement tiles around it taking up half of the rest leaving a tiny grassy section with a couple trees to provide some shade. The pool itself had several sections: a diving board over a deeper section, and a shallower section with seats and stairs to get in to allow guests to visit and relax. It was to that spot that Alec took his equine boyfriend, splashing into the water and setting him down on the bench, only in their speedos and matching necklaces.

Once they were both setting down, the smaller horse cuddling with his bigger, more muscular otter, who in turn stretched his arms to lean against the pool and rest a hand on the shoulder of his boyfriend that the tingly feeling from the shock earlier finally went away. It was replaced with a warm, comforting, soothing feeling that washed over both, making both sigh in contented peace.

For the longest time they just sat there, watching the clear blue chlorinated water ripple and wave, the fountain on the far end that constantly pumped water over decorative rocks before running into the pool pushing out the far distant sounds of the neighborhood around them and the city beyond that.

"Alec, I gotta question for you," Trevor murmured, turning his head up to look at his boyfriend.

"What's that Trev?" Alec asked, looking down into his mate's soft blue eyes.

"This is just a hypothetical, and totally impossible, but... well... would you still like me if I was bigger?"

Alec's eyebrow went up. "Bigger? Like, muscles and stuff?"

"And if I was taller and that too," Trevor asked. "Maybe, like, even bigger than you?"

The otter chuckled. "Well, since it's a hypothetical question. Sure, yeah, I'd still love you if you were bigger than me. All over, yeah. Because I like you for being the friendly, kind and sweet guy you are, not just because you're basically a big doll for me," Alec replied, hugging his boyfriend closer into his chest.

"I thought you liked being bigger than everyone else," Trevor said.

"Hell yeah! It's awesome! After all, not everyone can do this," Alec said, lifting up his other arm to show to Trevor, and giving his bicep a flex, pushing it closer so that the horse could grab and grope the big bulge, who reached up and stroked the thick muscle, finger tracing along the visible vascularity that provided the blood to keep his body pumped and massive. "But, well... being this big does have downsides too."

"Oh?"

"Yeah... you've seen me eat. Packing on the calories and protein for this body isn't cheap. Sometimes I hit my head on doors that are way too small, and I've scared little children."

"Really?"

"Yeah, the other day at the grocery store. And, let me tell you, having a four year old freak out when you try to smile because you look like a monster on a TV show isn't exactly something I'd like to go through any more." Alec sighed, and reclined. "Somedays I kinda fantasize what it would be like to be you... small and cute."

Trevor blushed. "And I've always wondered what being a big muscle stud like you would be like."

Alec chuckled, before reaching over and pulling Trevor onto his lap with a meep, flat horse chest against muscular otter pecs, their respective bulges pushing against each other, while still holding him tight. "Well, you'd be able to do that," the otter said with a grin.

Trevor giggled, before their muzzles locked together and began to make out. Alec's tongue easily pushed into Trevor's mouth, wrestling and sucking with the horse's tongue and making him moan and groan. The smaller horse began to slowly grind his hardening cock in his red speedos against the half hard cock in the green pair.

Alec's hand began to loosen, one webbed hand reaching up into the long rainbow coloured mane and pushing Trevor's face against his own with more force, while the other began to grope and rub Trevor's ass. The horse's hands also reached up, stroking and rubbing over the otter's arms and chest and abs, toying with the two thick nipples on his pecs, feeling over each of the chiseled abdominal muscles, feeling every muscle group where it blended and intersected with another to make the massive bodybuilding otter the way he was.

But as they made out, and unseen and unnoticed too the two lovebirds, their secret, recently revealed sexual fantasies began to come true, changes began to occur to both of them. Trevor began to grow larger, gaining almost six inches over a few minutes. But the otter in turn began to shrink, losing every inch over six feet tall to his boyfriend, making the otter's neck bend back to keep the locked lips together as he slowly began to sink lower into the pool.

The thin, lithe body of the pony began to fill out, thick cords of muscle stretch his soft chestnut fur. In moments, he looked like a well toned swimmer, with the faintest show of a six pack on his formerly flat tummy, while his shoulders rounded out and his arms gained power and mass. Alec, on the other hand, looked like a pool toy that had the plug pulled out: as his boyfriend gained muscle, he lost it: the massive bodybuilder physique began to drain away, months, if not years or work melting away. While he still looked big and impressive, no longer were veins popping under his brown fur of his biceps or thighs as he flexed, and his six pack began to recede, the thick blocks being shaved down to something more moderate and sedate.

But it was the bulges under the water where the biggest change happened. The similarly sized packages began to go separate ways: Trevor's equine heritage making itself known as inch after inch of horsemeat began to spool out of his sheathe, making the tight red speedo stretch and creak as Trevor's manhood grew almost half as big again to an impressive foot long, with two baseball sized testicles in the leather sack now fighting for room to breathe and flop and expand. But Alec, his impressive five inches began to dwindle: the thick ottercock began to shrink, though remained rock hard even as the pouch in the front of his speedo's become too big to hold the otter's reduced package, now clocking in and an average five inches. To complete it all, the ping pong sized testes, a size worthy of respect, began to contract, until it was maybe half the size as before.

Now, while Alec may have the size and weight advantage still, Trevor was now almost on an even plain, and who knew how much more they were going to change? That was, if anyone would have noticed, as memories of working out, swimmeets and daily running began to replace those of shopping and video games for Trevor, while Alec's history was being rewritten, the former high school quarterback now a wide receiver who didn't apply himself quite enough to maybe get the top spot, though he was plenty happy where he was.

Finally Alec and Trevor had to pull apart, panting heavily as their shared air supply ran out. They stared at each other, oblivious to the changes that had just racked their bodies.

"Man, you are hot," Alec said, looking up at the equally sized horse that straddled his hips, though his voice was an octave higher than before.

"You're one to talk, handsome," Trevor said with a grin, now with a deeper bass.

"Oh hey," Alec said, reaching and groping at the massive horsecock barely being contained by the red speedos. "Looks like someone is happy to be here right now."

"Maybe you better put that sweet talking mouth to work to give him a proper welcome," Trevor chortled, reaching for the otter's head and pushing him toward the horse's groin as he stood up on the steps, his half concealed package now exposed to the air.

Alec eagerly pulled the spandex down until the full foot of horsemeat was hanging in the air, licking his lips as his webbed paws felt up and down the mighty shaft, just barely able to wrap both hands around it, and coaxing drops of pre to leak from the tip, long strands of clear fluids dripping onto the otter's muzzle.

"Well? Going to give it a kiss?" Trevor asked, crossing his arms over his thicker chest.

"One moment, I can't just suck a log on command," Alec replied. "I will... just, you know... preparation.

The horse snorted in amusement, but the otter took a deep breath, and wrapped his lips around the thick, flat head of the horse cock. A nicker escaped from Trevor's muzzle as Alec began to get to work, taking a good six inches of the cock into his muzzle, the gag reflex the old Alex had before now vanished as he took more and more of Trevor's cock, with practice that he never had, but now did.

Trevor snorted again, eyes closed as Alec began to give one of his amazing blowjobs, and setting in motion the second wave of changes.

More muscle melted off of Alec's body, and showed up on Trevor's. The horse, a true stallion now, was built like a brick house, with a body seemingly carved by an ancient Greek sculptor to praise a god. The otter however was little more than a normal guy: a guy who wanted to work out but didn't have the commitment for it. Not that he didn't have some muscle and strength there, but he was far outclassed by Trevor, and he knew it. And loved it.

And that was why they were together, as their malleable history was played with some more: Alec was only an occasional gym goer, who really only went to scout for hookups and dates and showing off his lithe, thin body to the ripped, horny studs that were more committed to getting big. After all, with only four inches to work with, and an insatiable libido, you had to get a bit proactive with your sexual abilities, so giving blowjobs with the well hung and taking the biggest toys you could find online helped a lot. The five and a half foot tall otter was well known to the regulars to the gym as the perfect guy to get into the same shower stall or corner of the locker room to let off some pent up steam if you were too busy to get off yourself, or had a bad breakup.

That's what led Trevor to meeting Alec a couple months before, according to the rearranging memories: the big, nearly seven foot tall stallion, just starting professional bodybuilding, got stood up by some bitch, whatever her name was, and he needed to get his cantaloupe sized balls emptied... and little twinky, promiscuous Trevor was the only one that could handle fifteen inches of horsecock.

The otter was clearly an expert, getting all fifteen of those inches buried into his muzzle and down his throat, almost right to his stomach, and slipping it in and out of his mouth and throat like the well trained sexual deviant he was turning into.

Though, deep down in his subconscious, something told them that this wasn't right... that Alec was the beefcake and Trevor was the twink... but how could that be? No, that must have just been a weird memory that was half forgotten, and mixed with other incomplete memories to complete.

Trevor nickered with a deep, booming bass, and then shuddered as he felt his body getting close... but no. Not yet. He wasn't going to blow yet. He reached down, grabbing Alec's shoulders and pushing the otter off his cock with a shudder as his sensitive flesh was licked and sucked the whole way down to his flared head, throbbing and pulsing, begging for relief.

Alec took a couple deep breaths as he was picked up by the stallion, wrapped into warm, thick arms and draped by the long, rainbow coloured mane over his face, coughing as he rubbed his throat. "Fuck, I keep forgetting just how big you are," Alec said, his voice a high pitched falseto now.

"I'd have thought after this long together you would know," Trevor smirked, sitting down on the bench of the pool. "Maybe I need to remind you again?"

Alec shuddered, because he knew all too well what that meant. "I wasn't able to walk straight for a week the last time you fucked me," the otter said with a whimper.

"You can't walk straight anyway, you little gay slut," the horse smirked, before lifting the otter up, and resting the well used - though only hazily remembered being used - tailhole on to the flared head of the horse's pole, and then letting gravity get to work.

Both of them let out a loud moan at the same time as Alec was speared by Trevor, and inch after inch of thick, veiny horsecock slipped deeper and deeper into the otter's guts.

And as he sank lower, the final transformation took hold, and the final rewrite to their shared story. Trevor now clocked in at eight foot two inches tall, enough to make anyone notice him. Of course, the obscene, nearly impossible muscularity of the horse, so big that his professional bodybuilding career was short lived for the simple fact that he dominated every contest he entered and, though they couldn't detect any drugs or enhancement, he was politely, but firmly asked to resign so that others could compete on an even playing field. The boulders for biceps and thighs, the mountainous mounds on his chest cleaved in two by a Grand Canyon deep enough to stick a hand into. That alone would have been enough already enough to get people to not only notice but gawk and stare and ogle. not helped at all by the tight clothes he wore all the time (because everything at this size was too small) that did nothing to hide his size. Even lower, the massive bulge in the specially tailored jeans made his eighteen inches, thicker than a two liter pop bottle, with watermelon sized balls to match, was just obscene in general: going out in public always had the risk of being ticketed for public indecency.

Though Trevor quite enjoyed it anyway, showing off his degeneracy in a society that preferred it be hidden away. And that's where the porn career came in that allowed him to live in such a nice house with the big pool. And yes, it was now Trevor's house, having been purchased for cash thanks to the very lucrative career he had.

And it was through porn he found his fiance, the otter currently getting his bowels rearranged by the battering ram of a dick on his groin.

Alec had a bit of a reputation already in pornographic circles, able to take almost anything shoved into either hole, where double penetration was a regular occurrence, and for his tiny inch long cock, earning him the bawdy nickname as the "Mini Fleshlight." At least, until he was paired with Trevor for a few scenes. At first, even Alec couldn't quite take the stallion, but after months of personal training, he could take it like a champ, and now nothing could come close to filling him as the horse could. Sure, he could, and did, the porn with all the other well hung studs out there, but Trevor was the only one that could ever fill him, stretch him wide, leave him gaping, and begging for more...

And so with gravity, Trevor's strength and a history of taking big things up the ass, all eighteen inches of horsemeat was pushed under Alec's tail. The thick appendage meekly slapped against the rocks that made up Trevor's stomach as the otter's own belly was forcibly pushed out, the flat, flared tipped of the horse's member easily visible.

Trevor then lifted his five foot tall mate up until the medial ring slipped past the otter's abused anal ring, before dropping him again, making a splash was the cute round booty of Alec impacted the water. And up he went again, little more than a living, breathing fleshlight as his nicknamed implied, before being hilted again.

The horse grunted and nickered as he picked up speed, Alec's groans and gasps and moans and squeaks as the massive cock rammed against his prostate again and again and again, making the otter cry out as he was roughly used and stretched and battered... though he loved every second of it.

For what felt like hours the two went at it, Trevor picking up speed, hot air snorted out to mess the otter's fur as the loud noises from the otter began to even rise above the deep bassy horse grunts and moan until the entire neighborhood could hear the two going at it.

"Fuck, Alec... I'm... gonna..." Trevor snorted, panting heavy and ragged as he dig his hoofed fingers into Alec's hips.

"Yes! Oh! Fuck! Yes! Fill me! Flood me! Cum in me!" Alec begged out loud.

The stallion didn't need another command, and with a ear piercing whinny, he slammed the otter against the base of his cock, and the tidal wave began.

Alec looked down to see his belly, stretched already by the massive horse cock, now begin to stretch and dome and round off as the stallion's bounty was unloaded deep into his guts. He reached forward to feel the warm, sloshing seed fill him, and he gave a gasping moan as his own cock finally shot it's much, much, much smaller load, three or four tiny strands of otter seed landing into the pool, before being diluted and washed away.

The horse leaned back, his still rigid cock keeping Alec straight and stuck as he continued to cum. "Holy fuck... I think that was the best one yet," he panted.

"Hopefully when the other's come you'll be ready for another round," Alec replied. "After all, I bet Mike and Dan are just begging for another filling from you."

Trevor chuckled, resting a hand on the otter's gut and pulling him to lay nestled in the horse's chest. "Of course. I always am."