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A New Vessel

By Cimmaron Spirit

Commission for John_doe12346

WARNING: This story contains: demon possession, transformation, hyena-bear hybrid, horse, straight-to-gay, muscle growth, cock growth, hyper, oral sex, anal sex, foot play and more. If you aren't 18, or it's not really your interest, then you better go find something else to do. Otherwise, enjoy!

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Ari grumbled to himself as ducked his head to walk down the stairs to the basement. The old house that he was renting during his time at college felt just a little bit too small for him, and the basement was worse than any other place in the house. As he was taller than average at 6'3", Ari was constantly knocking the top of head against doorways, and every time he had to go into the basement, it had to be with his head crouched so as to not hit the support beams.

Somewhere down here, apparently, there were some lightbulbs. The landlord told him so, and since he was out of town for the next few weeks (and always seemed to be away whenever Ari had to call him,) it was up to him to fix the kitchen lights that decided this afternoon was the perfect time to burn out.

Ari reached for the small chain that clicked on the single bulb to illuminate the basement, and grumbled to himself at the small cone of illumination provided.

"Of course he would put it down here," he grumbled.

The piles of boxes and old furniture that the landlord no longer wanted to use, but didn't want to throw out, turned the basement into a huge maze. But somewhere on the far wall was the shelf of tools and household stuff. Should be some lightbulbs there, he was told.

Ari reached into his pocket and pulled out his cell phone and brought up the flashlight app, which was only slightly better than the old incandescent lightbulb he had turned on, and began to slink his way through the maze, the dark basement and shadows making it hard to figure out where to walk. He cursed and shouted as he banged his shin, his toes, his elbows against one thing, then another, and another. He did his best to not knock anything over, but it was impossible to see everything in the dark, even with his phone light.

He bumped into one perilously stacked pile of boxes, and scrambled to try to save them from falling.

CRASH! BANG!

Ari winced as his efforts failed, and the sound of metal, glass and porcelain smashing filled his ears.

"Shit, shit, shit," Ari muttered, reaching down to pick up the box that landed in front of him. But the bottom of the old, crumbling cardboard box gave out, sending all the broken stuff to the floor.

"Fuck!" Ari shouted, as pieces of glass and pottery landed on the floor and flew all over, making him jump backwards to avoid the razor-sharp shards... only to run into another tower of boxes.

The top box toppled forward, and landed on Ari's head, making him nearly fall to the floor. And there was another loud smashing sound, as a glass bottle shattered inside the box.

Ari scrambled over to the box, terrified at what valuable artifact he had broken. He pulled open the top of the box, to see that the glass bottle, like an old-fashioned jar, was now broke in half, but there was nothing inside of it, except an old paper note taped to the outside.

"Warning: Do Not Open," Ari read, and frowned. "Well, too late for that now I gue-URGH!"

Suddenly something grabbed hold of him, and seemingly threw him backwards. What it was, he couldn't see: his phone flew from his hand and landed face down, leaving most of the makeshift maze he was in cast into darkness.

Ari tried to sit up, but something was pressing against his chest.

"Let go of me!" Ari growled, reaching up to grab whatever was holding him down... only to feel nothing but empty air.

But there was a deep, otherworldly laugh that echoed through the makeshift maze of cardboard boxes, old couches and tables piled high with clothes.

"Oh, at last... a vessel," the deep, dark voice rumbled, making the blood in Ari's veins grow cold.

"What? Who are you? Leave me alone!" Ari exclaimed, before scrambling backwards, and managing to get up and race for the stairs.

All he could think about at this moment was how he used to be scared of dark basements, how his childhood home had one just like that always spooked him. Ari thought he had long banished that phobia.

But tonight, it came back with a vengeance.

He went around a corner, and to the basement landing where the single lightbulb hung down from the ceiling. But as he tried to climb the stairs, something grabbed his foot, and held him in place.

"Oh, it's much too late, mortal," the deep voice rumbled. "For I'm already part of you, and will be forever."

"No! No!" Ari screamed. "Matt! Matt!"

But his college roommate never answered. He was likely still at the college gym, a good twenty minutes away. Or in his room, blaring music so loud that even a freight train couldn't interrupt him.

The deep, demonic voice rumbled and laughed again, pulling Matt down, pinning him to the stairs. It felt cold, and dark. "Oh, foolish mortal. Thinking someone can save you now? And why would you want to be saved? For I have a gift I gladly will let you have."

"What the hell are you?" Ari shouted. "What do you want?"

"I want to be free," the voice replied. "And you are the perfect vessel for me. And I know you will enjoy it as well. You mortals always do."

Ari groaned, trying to pull away from the stairs, but found he couldn't move. But he could feel ghostly hands rubbing over the front of his body, under his t-shirt and groping his tanned skin, playing with his nipples, getting past his shoes to massage his feet, slipping through his jeans and toying with his cock and balls.

The college student struggled and strained with all his might, and he finally turned around, landing on his back. But while all the sensations that had assaulted the front of his body vanished, it was instantly replaced by those same invisible hands now playing with everything on the other side of his body. Back muscles kneaded, biceps groped, his neck massaged, his ass smacked and stretched. The last sensation alone made Ari struggle and fight even more.

"Urghh... let go of me!" Ari gasped, trying to fight. "This... this is not right! Leave me alone!"

"Oh, but what are these images in your mind?" the deep voice from the nether remarked, before letting out a laugh. "You are already turned on by my voice. I'm sure you will by my body too, once I'm complete!"

Ari tried to banish whatever it was that the voice and power that was dominating him was talking about, and continued to struggle, to climb the stairs, before finally, with groping hands playing with his body the entire way, he reached the top, pushed past the door that lead to the basement, turned around and forced it closed.

He staggered to his feet, gripping the wall as he tried to stand. But his eyes caught his shadow on the wall. It was bigger, furry... and moving on its own.

"Oh, you finally see me now, eh mortal?" The demon said, the shadow moving of its volition.

"How... how did you do that?" Ari groaned, exhausted from all the struggling.

"In time you will find out," the demon said, as the shadow seemed to grow larger and larger, divorced from the light from the rest of the room, and seemingly swallowing the entry way and kitchen into a black void. "But I must make my mortal vessel more suitable for my... our purposes."

Several thin streaks of darkness crossed over Ari's chest, slicing through his shirt and making the cotton fall and disappear into the black void, followed by several more shadow knives cutting at his jeans, underwear and socks, leaving the human standing in the nude: his tan skin visible for all the world, his black hair matted and messy, his wide, brown eyes trying to find an escape.

"Stop it!" Ari shouted, trying to fight the unseen creature that was tormenting him.

"Even if I wanted to, I can't," the deep voice, now coming from everywhere around the human. "I've been imprisoned for so long; I need to breath free once again! And first things first... It's been a long time since I got off. So bear with me, as I get that out of my... our system."

Before Ari could reply, his mind was suddenly awash with thoughts and feelings, a libido and sex drive that only in the most heated moments of late-night internet searching and one-night stands after drunken bar encounters. His cock sprung up to life, already leaking pre-seed like a broken faucet, as the urge, the desire, the need to fuck, breed and rut filled his mind. Muscular men with Adonis like forms, flexing and posing, with round bubble butts and throbbing cocks.

"Urghghh, no!" Ari groaned, as his hand began to wrap around his cock of its own volition, stroking him to the thought of hot, gay sex.

Ari tried to fight back from inside his mind, to reclaim control to move his arms and limbs with his own will power. But the demon had very effectively taken over his body, and left only the feeling, the sensation, the desire and need, to Ari's senses. But with each stroke of his cock, it grew longer and thicker. From a normal five and a half inches to seven, then ten, then 14, then to a mind boggling 24 inches, a full two feet, and as wide as a pop bottle. His balls also began to fill and sag lower and lower until they reached his knees, the testicles being enlarged and grown to rival cantaloupes in size.

"Mmm, yes... that is a good size," the demon remarked, satisfied with Ari's penile enlargement. "But there are more changes that must be made before I will be satisfied with my new vessel."

Swirling shadows and unformed cloud shapes now began to wrap around Ari's body. He winced and groaned and cried out as he felt his body being reshaped: bones lengthened and reformed so he was now standing on digitigrade legs, muscle added to every part of his body that could have muscles (and some he wasn't aware could be enlarged). His stomach grew larger and into a muscle gut, while his biceps and thighs gained new power and definition.

Ari's face began to push out into a muzzle, making him whimper as his teeth grew and sharpened into fearsome canines, while his nose turned larger and black. His ears shifted to the top of his head and grew larger, as his hands grew rough paw pads and sharp claws, and his toes shifted and changed into animalistic paws.

To cap it all off, every single hair on his body grew longer and thicker, until soon he had a furry coat from ear to paw: the hair on his head grew longer and began to stand straight up like a mohawk, and stretched down the back of his thicker neck. His stomach and chest were a light tan, while a light brown covered most of the rest of his body, except for the many black spots that appeared all over, and a darker mask over his eyes and muzzle. A thick, dark brown, bushy tail pushed from his tail bone, swishing happily in the dark void.

For the final touch, the enlarged penis on his groin also began to shift: fleshy barbs appeared on the tip, while the base of the pink cock inflated larger and wider, turning into a thick knot. Both these additions promised to make any future lovemaking an experience that the bottom will never forget.

"What... what have you done to me?" Ari asked, trying to get used to his new muzzle, as he looked over his new, hyena and bear hybrid body, and the fat cock that he was still rubbing and stroking.

"Made you perfect, that's what," the demonic voice said. But now it was coming from inside his head, making Ari whimper all over again.

The flow of pre only accelerated now that there was a ten-fold increase in production. The transformed Ari's knees let go and he fell backwards, suspended in the black void still around him. But he was so well hung, bigger than any man in the world, that his agile legs and feet could reach up, the rough pads on the bottom pushing against his sensitive cock, and with his hands at the base and the feet closer to the tip, began to jack himself off with all four limbs.

Ari's mind was nearly shot at this point. The pleasure, the sensations was too much. He was captivated, enthralled as he watched the demon's provided visions of gay guys kissing and making out and fucking each other in the ass, and watching their dicks grow larger and balls balloon in size. But as they mated and rutted, fur began to sprout over their bodies, and they turned into other animal people: dogs, cats, deer, birds, horses, elephants, and a hundred other species. All muscular, all hot, all sex crazed.

Ari closed his eyes and cried out, as he finally reached orgasm, sending what felt like gallons of demonic spunk through his urethra, and into the dark void all around him, coating his hands and paws and lower body in all his cream.

"Ohh, excellent," the demon rumbled. "That felt good, now didn't it, my new vessel?"

"Y-yes... it... felt good," Ari, in his afterglow, replied, sprawling out in the shadowy void. As much as he wanted to deny it, well, it did feel amazing.

"Do you want to feel it again?"

Ari let out a whimper. "I... I don't..."

"Still hung up about not being a human or something? Even when you can now join me, and become an icon of sex and lust and power? Never worry about classes or landlords or rents or jobs?" the demon remarked. "All you human mortals are the same. But you all eventually give in, and learn the true thrill, the true power that I can provide you."

Ari wanted to reject it, to try to banish this demon from his body.

But he already felt his two-foot-long cock, so recently spent, harden and spring up, leaking pre all over.

"Oh, I think I hear something... your roommate perhaps?" the demon rumbled and let out a deep laugh that made Ari's body shudder. "Maybe you need another lesson, a trial run."

Suddenly the cloud around Ari vanished, and he found himself standing in front of Matt's room. He could hear loud music, the same heavy metal that he blared at all hours of the day when he was in his room.

Ari felt his arm rise up, reaching for the door handle.

NO! No! Stop it! Ari screamed inside his head.

But the demon's power over his body was too much, and with a simple flick of the wrist, the door opened, to show Matt, shirtless, looking at porn, his hand around his cock. Pictures of naked women, with large breasts, kissing or being plowed by well hung porn stars.

Matt spun around, covering his hard cock with one hand, that panic of being discovered very noticeable.

"What the fuck man! Knock fir..." he started to say, but the words were lost in his mouth as he saw the tall, beefy, hyena man with the two-foot cock, pointed right at him.

"What the fuck?" Matt exclaimed again, his voice cracking. "Get that thing out of my face!" He smacked the cock, half expecting the massive, knot and barbed cock, to fly off, some cheap costume his roommate had made to scare him. But when it only bobbled back and forth, and squirt copious precum all over his hand, the panic returned.

"Surprise," the demon, using a deeper version Ari's voice, said, before reaching up and grabbing Matt, easily lifting the wrestler from his chair, and pressing his muzzle against the human's lips, one hand digging through Matt's blonde hair to push the human's face into the hyena-bear's muzzle.

Matt struggled for a moment, trying to form words and thoughts to protest, to say that he was straight, he wasn't gay, trying to resist the monster that barged in on him and so easily dominated him. But as the hyena-bear's tongue pushed past and into his mouth, something clicked inside Matt's mind. Like this was good. This was right. This was perfect. The human surrendered in moment, turning into putty in his arms, every struggle for his sexuality forgotten in an instant. Every lust in his dreams and desires changed from buxom babes to big dicked men. Especially if they were furry and monstrous...

The demon let out a growl as recognized the human's submission: the aphrodisiac powers he possessed long ago still worked perfectly, turning weak-minded mortals into willing servants in an instant. It would come in handy in the future, the demon knew.

Demon-Ari turned around, and then dropped Matt onto the bed, one hand already reaching down to grab the cock that was a quarter of the size of Ari's with large, animalistic hands, and began stroking hard and fast, quickly getting Matt back to the edge of orgasm that he was nearly at before he was interupted. The thick, rough, broad tongue continued to wrestle and overpower the human's in his mouth, exploring every crevice inside Matt's mouth in a French kiss that rivaled anything that even a professional escort could accomplish. Ari ground his huge cock against Matt's chest, the six pack abs, thick pecs, tree trunk thighs, and bulging arms soon coated in constantly oozing pre cum and seed.

The enlarged creature pulled back, his grin showing off fearsome fangs. But Matt, his minded clouded by the power and allure of the demon, didn't think he was in danger. How could he be?

"Oh, you will be a perfect addition to my little group," Demon-Ari rumbled.

"Oh... fuck... yes... let me be a sex slave for you!" Matt groaned. Ari, his conscience trapped deep inside his former body, but still able to listen and feel every nerve synapse and twitch of muscle, was stunned. Not only was the big muscle jock he was paired with as a roommate turned straight, and a very machoistic, borderline homophobic, dominant straight, to gay in an instant, but he was turned into a huge submissive slut for this demon as well? How the hell did that happen?

He long had fantasies about finding out Matt wasn't actually gay, or he was at least bi-sexual, that it was a show, and that one day he'd barge in, and practically beg to have sex. Sometimes Ari would be the top, more often the bottom in those dreams.

But now, with him being turned into a massive monster with a cock that even the most depraved and thirsty size queen would say was impossible, those dreams were coming true.

"First, I need to turn you into the true beast you can be," Demon-Ari rumbled, before stepping back, still holding onto Matt's dick, and pulling him off the bed and onto his knees on the floor, face lined up with the massive cock in front of him.

Matt didn't need to be told twice, as he wrapped his lips around the tip of the gigantic dong in front of him. While he had no hope to taking the full length into his mouth, he could, and did his best, to lavish attention onto the cock hole and the barbed tip, his hands reaching down to explore the fat knot and loaded balls, groping and stroking the length and every inch he could reach.

Ari felt electric tingles race through his body as the sensitive cock head was played with. Each time Matt's tongue flicked across a barb, or squeezed the bulbous knot, or jostled his testicles, there was another wave of pleasure that raced through his body.

Feel that, vessel? The demon rumbled deep inside Ari's mind. That is the feeling of power. Of control. You humans can never truly understand it, much less harness it.

So tell me... how do you like it?

Ari was so conflicted. Yes, he had long fantasized about having sex with Matt... but not like this! He - or rather the demon - was basically mind controlling Matt right now.

And, yes, it felt good. Feeling his cock being played with, his heavy balls groped.

But tomorrow, what would Matt say? How could he live with his roommate after this?

That was, if they were human tomorrow.

And the demon, whatever his name, seemed pretty intent on remaining on this plane of existence.

And it felt really good...

That's it, vessel, the demon said, as Ari's hand reached down and began to caress the back of Matt's head, messing up the blonde hair even more, gently pushing Matt's face against the head of the huge cock. Embrace the power I have, that you now have as well.

Ari's fingers, buried into Matt's blonde hair, began to twitch, pushing the human's face harder against his cock, which only made the wrestler work even harder, sending more of those indescribably intense and pleasurable tingles through his body.

"Yes... ohh... fuck... yes..." Ari rumbled, having reclaimed his voice, as he pushed his roommate's face deeper on his cock, forcing his mouth to spread wider.

The dark shadows from before began to grow and spread around the demon and the human, and soon the traces of blackness that had transformed Ari before now began their work on Matt.

The already well-built Matt began to grow even larger. More muscles began to form on his body, turning him from a powerful wrestler to a god-like bodybuilder. His biceps grew so large that veins began to pop through his skin. His neck bulged larger, mountainous trap muscles began to fight with growing pecs and widening shoulders.

Lower down, the already visible six-pack abs now grew larger and more defined, while his glutes expanded larger, turning into a massive, round bubble butt. The thick legs grew thicker, forcing him to widen his stance. That became even more pressing, when Matt's cock began to surge in length, the above average seven inches doubling to 14, then more than doubling to 30, even longer than Ari's own enlarged manhood. Matt wouldn't be able to wrap both of his hands around the girth of his fuckstick now. And already precum was dripping from the tip, fueled by the two basketballs now in his ball sac.

Ari finally let go of his roommate's head, allowing Matt to pull back, and take in some deep breaths. Once fresh air was in his lungs, he looked down over his massively engorged body.

"Holy shit! I'm huge!" he said, flexing his arms. "Fuck, I'll never loose a match again!"

Ari let the engrossed beefcake admire his new body for a moment, admiring the massive size he, and his demon's power, was able to accomplish.

But he wasn't done yet.

Ari grinned, before reaching down and lifting up Matt in the black void they were both in, and he pushed his own, massive cock against Matt's ass.

"W-wait... I... I can't take that," Matt moaned. "That... that's too big!" Though the throbbing length bobbing from his groin and the lustful gasps said that he would love to.

"I'll make it fit," Ari grinned, before pushing the barbed tip past Matt's virgin hole.

Matt let out a loud cry: not of pain, but of pleasure. Somehow, despite the huge log on Ari's groin, the whole fat tip easily slipped in, spearing the engorged muscular beefcake with little effort. Both Matt and Ari moaned and growled as the sensitive barbs on the dick began to scratch at the sensitive walls of Matt's ass, dragging against flesh and his prostrate and g-spot. Soon, almost the entire cock was buried into Matt's round ass, with only the fat knot left outside.

But that was only the first step. Ari began to pull out, letting inch after inch of his fat dong slip out, the barbs retracing their steps back out, making Matt whimper as his stretched ass began to beg to be filled against by the huge demon cock. Ari quickly replied by shoving his cock back in, the barbs and thickness returning with force, with a loud slap as his knot impacted Matt's ass.

Ari began to piston in and out, slowly and steadily picking up speed, making Matt gasp and groan and cry and howl loudly as he felt sensations he could never have dreamed of before. Ari himself was grunting as his cock grinded against the edges of Matt's unused ass, requiring a strength and effort he never had before to continue to fuck his roommate. And now with a nearly three-foot cock bobbing in front of him, Ari reached forward and took the tip of Matt's cock into his mouth, easily swallowing the top few inches. With each thrust forward, Ari would now bob his head down to take in more of the cock, and each pull back, he would lift his head up, leaving only the tip in his mouth, before sucking as much of Matt's dick down again.

But the demon, as much as it enjoyed the massive and lewd display, had something else in mind.

The shadowy lines and shapes soon began to cross over Matt's body again. Having completed the first step, merely in making the wrestler the size he wanted, now the demon was turning him into the shape he desired.

First, brown and blonde fur began to sprout all over Matt's body, covering his white skin up with a coat of fur as shadows passed over Matt, removing his humanity in favor of an anthropomorphic animal that was still not clear.

Matt's face began to shift and change, the bones structure forming a large muzzle, with large broad teeth of an herbivore (and also now more than capable of swallowing Ari's whole cock in his mouth). His ears shifted into large, diamond like shapes to the top of his head capable of swivelling back and forth, and the blonde hair on his head grew longer, into a mane that traveled down his broad back to a place about half way down.

But now the changes became more specific: His legs shifted into a digitigrade stance, with his ankle being forced up higher on his leg, and his toes melded together to form large, broad hooves that would be large enough to hold up the massive beast Matt was becoming. The fingers on his hand grew larger and thicker, with miniature hooves on each finger that resembled the larger hooves on his feet. Long blonde hair sprouted from around half way up his lower arms and around his ankles, covering his hooves and hands with flowing feathers like that of a draft horse.

A long, blonde tail that matched the mane and feathers also sprouted from just above his ass, before swishing and swaying in pleasure and excitement as he was sucked and fucked mercilessly by the bear-hyena-demon.

And the final change, as with Ari, was the cock: the already massive cock now grew several inches longer to a full three feet long, and the human mushroom tip was replaced with a large, flat, equine flare. The pink flesh gained black mottling over part of the shaft. Half way up the length, a medial ring was formed, and now Matt was truly hung like a horse.

The new draft stallion, being fucked and sucked at the same time, was on the edge. The tongue, the cock, the hot mouth, the barbs... it was becoming too much. Already he could feel his balls tensing up, lifting up.

He couldn't hold any longer.

With an ear piercing whiney and a clench of his own body., Matt came.

Gallons of horse seed blasted into Ari's mouth, forcing him to drink all that he could, but despite his best efforts, long strings of cum shot out from around the edges of his mouth, soaking the horse cock, balls, and his own junk, in the overflowing spunk.

He pulled back, letting the geyser of stallion seed wash over him.

Ari was on the brink as well, and he was jackhammering Matt's ass as hard and as fast as he could, his fat knot smacking against the tight entrance, demanding to be let in.

And with a predatory growl of power and dominance, he shoved his hips forward again, and got that fat knot inside.

Ari came with the force and power of a demon that had been kept pent up and blue-balled for centuries, and soon his own cream wasn't able to be held by Matt's ass and it too began to gush out around the hyena-bear's cock and knot, adding to Matt's still gushing fountain of stallion milk.

The two collapsed on each other, still hanging in the dark void created by the demon that had possessed Ari, and now had spread his influence to Matt as well.

Even as their bloated balls continued to pump more and more cum, they learned all the powers of the demon. To shapeshift with shadows. To grow and enlarge their own bodies, and those of others. To spread the possession on.

The formerly average Ari, and the wrestler Matt, now given the gift of lust and sex, knew they had to go and carry it on.

To find new vessels to pass on the power of the demon.