A musky room
Chris woke up on the cold floor with a meek groan, his head fuzzy as he regained his senses. He managed to slowly push his young body up until he was sitting up on the carpeted floor. The room he found himself in was small, barely larger than a prison cell. Its walls were padded, with a large glass panel to his left that allowed him to see a dark grey corridor. There were no windows or doors, but there were two small ventilation ducts opposite to this glass wall, close to the ceiling. He saw a small young boy, not older than ten, lying a few feet in front of and he called his name with worry: "David? David, wake up!"
David groaned, holding his head in his hands as he began to wake up. The boy felt sore, tired, and very, very much scared. He looked around, taking the room in, his slightly underdeveloped body shifting as he looked at Chris. "I... Big Bro... what's... what's going on?" David swallowed, almost whimpering. He realized in fear that this room was a cell of some kind. "I... I can't remember what happened... or... or how we got here or anything else!"
Seeing David so afraid made Chris realize the gravity of the situation; he didn't remember anything either. For one second the older brother was tempted to give in to his rising fear, but he took a deep breath and swallowed down the knot in his throat. "It's okay", he said gently, standing up and going over to David. "We're gonna find a way out of here and find Mom and Dad, I'm sure they're looking for us." When Chris was in front of his little brother he knelt down to his height and hugged him briefly, before offering a small smile. "Let's see if there's a way out."
"Yeah... let's.... let's get out." David looked toward the big glass panel, and was tugging himself nice and close to Chris. The small boy didn't want to be far from his brother's warmth, and he didn't want to be far from his protection. He knew that Chris was bigger and stronger than him. If something went wrong, Chris would be able to go ahead and come to him and defend him in an instant. Or at least, that's what David thought. Whether that was the reality of the situation was something else entirely.
Even though Chris wasn't much older than David, he cared for him dearly. They shared that special bond unique to brothers and Chris took his responsibility as the elder very seriously. With David in tow, the young teen ran his hand over the glass, looking for edges, irregularities or anything else that may indicate an opening. However, there was nothing. After inspecting the glass end to end he gave it a few knocks. The resulting sound was deep and low; it was very thick glass. "Uhh... Let's check the walls," Chris said, trying to install some hope into them both.
David nodded, though he could sense the concern and even a little bit of the fear in his brother's voice. He was beginning to detect that maybe not everything was going to be alright. If Chris was starting to get a bit nervous... David didn't want to think about it. Instead he took a nice deep breath and began to focus on looking. He checked everything on the walls, eventually coming to the grated vents. He was much too small to see into them, and couldn't figure how he and Chris were put into this room.
The elder brother followed suit, pressing his hands against the padding of the walls, hoping to detect any dent or bump or maybe even a hidden door. After trying half the room, he found nothing and decided to check the vents David was under. Chris took a moment to assess the situation. They were locked, but it seemed whoever was doing this wanted them to be somewhat comfortable, considering the carpet and padding. The teen tried to look into the vents but was just short of staring into the duct. Seeing David standing nearby, he got an idea. "Hey little man, get on my shoulders and tell me what's in those vents." Chris went on his knees so David could sit on top of him.
"Right! That's a great idea!" David went ahead and tried his best to crawl up Chris' back, but found it a little difficult. He got his brother to get down closer to his knees, so he could sit a little bit more comfortably around his neck. Thankfully it was possible, and Chris was able to get back up again, carrying his brother. David looked down the vent and saw nothing at first, but suddenly there came a faint, yellow-green gas, rushing towards him ahead of a bunch of warm air. He cried out and fell back off Chris's shoulders, just as that gas began to filter into the room and sink towards the floor.
Chris led David away from the vents into a distant corner as they remained huddled together, not wanting to let go of one another. The gas thinned out as it blended with the air, losing most of its color. A slow, steady stream still trickled from the vents. Chris was about to tell David not to worry, it couldn't be poison, when the teen caught the first whiff. The smell reminded him of his unwashed dirty undies with something else he couldn't pin down. To his surprise, it wasn't as unpleasant as he thought it should be.
David sniffed the air after initially holding his breath, being just as surprised that it was not nearly as bad as he had thought that it would be. It smelt of sweat, unwashed clothes, and a bit like something else? He couldn't exactly place what the smell was, but it didn't bother him that much. He even found himself sniffing a little bit more, curiously, as if to try and get a little bit more of the gas into his nose.
"That was... weird. But I think we're okay," Chris said flatly, feeling calmer all of the sudden. He focused on the smell; it really wasn't that bad and he started to take deeper, more careful breaths to analyze it better. The teen felt his body getting slightly warmer after each breath
David took many long, deep breaths himself. As he did, he started to feel strange. The boy started to get warmer, cuddlier too. He clung to Chris, squirming, not realizing that his shaft was beginning to harden; his small little peepee.
Chris was initially surprised to see David get so affectionate suddenly. "Little man, are you... okay?" asked the teen. When he looked at the small boy's face, however, he didn't find anything wrong. David was so cute. So adorable and small that Chris just wanted to... touch him. His head was getting lighter and his body warmer but Chris didn't mind. "Do you feel... warm as well?" he asked, stroking David's soft round cheeks.
The child nodded softly and cutely. He was blushing hard now, nostrils flaring as he kept sniffing around. His tongue even slipped free of his lips, tasting the air a bit. "I'm okay big bro... I just... I'm still a little scared and I wanna be really close to you okay?" David nuzzled into his brother's arm, tugging tightly, even a little clingy.
Normally Chris would tell the boy not to be so needy, but now... Now it felt good to have David hugging him so tightly, and the boy's blush made Chris feel warm flutters in his tummy, that soon travelled down to his hardening young cock. He could feel the musky scent in his mouth and he licked his lips involuntarily. "It's okay little man, you can hug me all you want." He caressed David's short, silky hair. "Maybe… we should take off our shirts... It's getting very hot..."
David was already doing it. He was getting gradually sweatier, but that's not why he chose to strip. It was all because he wanted to have skin to skin contact with Chris. The boy's own dick was beginning to get harder, until it was at full mast—as small as that actually was. He groaned, getting close to his brother, nuzzling his head against his side and armpit, realizing Chris smelled a little like the gas.
The teen took off his shirt—no small task with David clinging on him so tightly—but soon they were both shirtless, their sweaty smooth skin rubbing against each other. Chris ran his hands over David's upper back, then his front, feeling his little hard nipples. The teen realized that he was now painfully hard. He looked down on his little brother’s small body and licked his lips when he saw that small bulge in his pants, still breathing in rapidly, absorbing more of the pheromone-laced musky air.
David was blushing harder and harder, much more so than he should have. He hadn't gotten sex-ed or the talk yet, so he didn't really know what he should be doing. It was scary. "Big Bro... my uhh.... my thingy is really stiff and it kinda hurts." He didn't realize yet that his ears were beginning to grow a little bit pointed and that his own sweat was beginning to smell musky.
"Yes... I see that..." Chris mumbled, somewhat dreamily. A new scent was being picked up by his increasingly sensitive nose. Was it coming from the younger boy? It smelled... Good. So good, the teen blanked out for a second when his dick throbbed hard against his pants. "It's okay little man, just... Take everything off and I'll explain" Even as Chris said this, he was already unbuckling his belt.
David nodded innocently and began to drop his shorts and his tighty-whities that were surprisingly stained and insanely musky in the crotch. He slipped free, his tiny little shaft hard and throbbing in the air. The boy held the musky underwear in his hands, before bringing it up to his nose gingerly, placing it against his face and taking an extra deep breath.
Chris looked at David's wet underwear in slight confusion as he finished taking off his own. Wasn't he too young to start producing pre? Was it the gas? But Chris's thoughts were swept away by the smell of the musky underwear. The youth's dick throbbed needily and he was panting hard now, struggling to focus through his foggy mind. "Alright... So..." Chris leaned against the wall, feeling a small bump above his butt that he ignored for now. "Your tingy is hard because you're horny. It means you want to put it inside a girl. Girls have holes instead of peepees. When you do that and you move, you squirt out something called semen inside the girl and that makes her have a baby. Most boys get horny because of girls, but sometimes they feel horny for other boys as well." Chris looked at David as he said this, and that underwear... he had to smell it up close somehow.
"I... why am I horny. There aren't any girls here. There's just us," David whined, still rubbing his underwear against his face, sniffing and licking it, not even thinking about it. Chris saw that the boy's cock was dripping huge amounts of totally clear pre now. There was nothing really in it, and if David came it would be a blank. He was still impotent, too young to have fertile seed at all. He was getting so horny though, his eyes glowed a fierce amber color, and he growled little as he sniffed his underwear, tears welling up in his eyes as he struggled to make sense of why his peepee felt so damn needy in that moment.
"I'm... Not sure," Chris admitted. "I'm really, really horny right now too..." He swallowed, running his tongue over his teeth; somehow, they felt longer. The bump above his ass seemed to be swelling as well. "It's okay. When boys get horny, we can touch our own weenies. It's like we're inside a girl. It feels really good. Look." The teen finally got to do what he needed so badly: he took his thick, drooling shaft in his hand and stroked up and down. The pleasure was stronger than any previous sessions and he let out a low beastly growl unconsciously. “Try it... Touch the tip." Chris panted, leaning back on the wall, voice deeper than before. He looked at David and his underwear and noticed the boy’s pointy ears and amber eyes. Chris’s foggy mind didn't register them as something weird. It was nice to look at. It made David cuter in a different way; a way he had never felt before for his baby brother.
The boy acted on what Chris told him: grabbing his cock with a few of his fingers, and beginning to stroke and tease it. His movements were sloppy at first, as he really didn't know what he was doing. But as he continued, more and more instincts began to kick in. He began to thrust his hips, groaning and even whimpering. Tears of pleasure streamed down his face, and a few seconds later the boy experienced his very first orgasm. His entire body shook and he screamed, as pre and watery clear cum splattered from his tiny little cock all the way to the clear wall, staining it and beginning to drip down. The moment he did, his balls practically inflated like balloons: both of them expanding rapidly, his musk getting even stronger as he fell over, face in his own mess, licking at it with a slowly extending tongue.
Chris watched him all the way as he stroked himself, David’s lust fueling his own. It was clear that the boy was ahead of him; he was getting aroused faster and he came before Chris. Was it because of his smaller body? It didn't matter. David’s orgasm was insanely hot to watch for Chris and it pushed him right to the edge, but he needed something more. The boy’s underwear lay abandoned between them.
As he licked his cum, the teen took that underwear in one hand as his other stroked his dick furiously. He breathed in David’s young, boyish musk; the single greatest thing he ever smelt. Chris pressed the underwear hard against his nose as he came like never before, ropes of milky cum splattering over his chest and nearby floor. As he let himself collapse, he felt a mild pressure as the bulge over his ass expanded further, soon covered by a thin layer of short brown hair. His ears shifted as well, becoming rounder as they moved slightly up his head.
As David laid there in his stupor, he began to feel a little bit of his awareness returning. He could smell the musk, and it was washing off their bodies strongly. He felt his love for his brother surging, but this time it was a very different, very corrupted kind of love. The boy rushed out over towards Chris, scrambling on the floor. As he did his butt expanded, getting much smellier in the process as well. His spine was pushing out, rubbing against the skin of his back, each bone cracking and snapping. He drooled, panting, getting closer to hug the youth. Even more dramatic was how long his hair was getting, turning wild, shaggy, much coarser at the same time. His balls were churning, producing something new, thicker seed—potent and hyper fertile.
Chris smelled David before seeing him and scrambled to sit against the wall, his head reeling from that powerful orgasm. The boy’s musk began to rekindle his lust as he neared him. David looked different. Wilder, stronger. His golden eyes reflected a deep, perverted need. The teen should be scared, but wasn't. Instead he welcomed the boy with open arms as golden specks began to appear in his irises. David didn't do anything at the moment. He just hugged Chris, and then began to grind. His cock was beginning to grow, getting thicker, harder. Every single pulse of his heart made his cock grow longer and thicker, inch by inch. It was filling with blood too, getting darker. The boy whimpered, looking down to see his dick flip upwards, get encased in a hyper musky sheath, and try and push free, but his new, softball sized knot kept it stuck.
Chris hugged back tightly, his hands changing as he wrapped his arms around David’s back, the teen’s digits becoming shorter and stubbier as dark paw pads extended over his palms. "You're horny little boy?" he whispered huskily into the child’s pointy ear, "Tell me how horny you are." His changing paw reaches down to David’s developing tail and started to play with the sensitive flesh.
"I... I... horny... big horny. David gggggrrrrrrsaaawwrrrr....." The boy’s voice warped as he spoke. It began to bend in both pitch and timbre, getting deeper and huskier, dramatically so. His chest began to barrel out quickly. Cracks echoed out, each rib was forcing itself out, muscle following. His teeth cracked, getting longer, sharper, pushing past blackening lips. He panted, thrusting his hips violently now.
The teen felt himself being drawn to David’s powerful new body and strong musk: the smell of a powerful, virile male. He tightened his embrace as the changing boy thrusted wildly, pressing his needy dick against his younger brother’s. Soon Chris’s rod began to grow as well, becoming thicker and filled with throbbing veins as short brown fur sprouted around his belly button. "Yes..." he growled needily, their cocks rubbing together, "Gggrrrr…. Good boy David … hhhhmmmm… good boy..."
David said nothing, feeling that something was wrong with his mouth. His jaw was extending outward, new teeth growing out in the spaces that were opening up. Drool dripped down his lips and he panted, growling, thrusting that needy cock of his with pure desperation and hard need. Black fur began to sprout out from his spine, spreading over his slowly expanding body, little by little. "GGrrraaawwwrrr..... ggrrrr...." As silky black fur began to cover David’s back and tail, Chris ran his changing hands through it, feeling them turn into big soft paws, nails extending into claws. He squeezed his brother’s ass tightly and pushed him harder against his body, as a thicker fog began to cloud his mind. Can't... Think... Chris pressed his face between his neck and shoulder; the smell was powerful and intoxicating, and he licked the boy’s flesh as if savoring a tasty candy.
David panted hard as his own mind was rapidly simplifying. He felt new animalistic instincts taking over him with pure passion and aggressiveness. His asshole itself was changing, becoming a dark pucker, throbbing and straining. Sharp claws ripped free from beneath his finger nails and his slightly distended face began to actively extend into a full muzzle. He found himself drooling now, blackened nose sniffing the thick cloying musk passionately. Chris smelled the change in his little brother. His scent became even thicker, more primal and stronger. The teen’s licks turned into nibbles, his bigger teeth scraping delightfully against David’s hot flesh. Chris growled as his own frame began to change, his shoulders widening, arms bulging with new muscles, his chest and belly expanding with muscle and fatty tissue as his ass swelled. His body began to pump out its own musk, familiar yet unique.
Meanwhile, David was absolutely drenched in his musk. It was in his fur, coming from his body. However, he was slowly starting to sweat less and less. The musk was now concentrating on the soles of his feet and the palms of his hands, where the flesh began to turn black and puff out, rather thick now. He had more muscle than his older brother, and he was growing gradually, even as his tail extended and wagged wildly. Chris felt his brother grow until they had the same height. The bump at the end of his spine finally developed into a real bear tail, short and stubby. Even if David was covered in that delicious musk, Chris felt a new craving for the wolf-boy. He gave a little love bite to his shoulder, then looked down at that thick, drooling, musky wolf cock. Pleasure... Give pleasure... Chris’s last human thoughts devolved into an instinct-fueled need for sex and for David. He brought his face, that was slowly turning into a short and thick muzzle, close to the musky, needy dick. David’s back was arching now, hunching over as his hips and legs began to form a shape that was much more suited to being on all fours. It felt natural though, it felt right. His forelimbs hung over Chris’s back, getting comfortable as he was left beneath the nascent bear. The former boy’s chest had broadened by now into the thick, barreled muscular chest of a wolf. No human thought remained as he started thrusting his hips instinctually, trying to get his cock inside of the bear’s muzzle, trying to fuck his mouth, trying to fuck absolutely anything that he could.
Lying on top of David, Chris took his cock in one paw and bought it to his muzzle. His long, flat tongue rolled out hungrily for his baby brother, as thick globs of drool cascaded down his darkening lips. He gave that warm dark cock a long lick from knot to tip, then another, and another, and finally welcomed it into his warm, wet muzzle. His other paw went to work with his thick bear shaft. David whined and started humping wildly, as if he had hilted himself into the waiting cunt of a bitch. But instead it was his brother’s muzzle. He kept thrusting, trying to fuck his muzzle with no fear of those teeth in the least. If anything, all of it was making him more excited. Human thought was gone, so it was adrenaline and need such as that pushed him onward. “GGrrrrrAAAWWWrrrrrrr!!!!"
The bear closed his gold-tinted eyes and moaned and growled around the salty, musky shaft, his sounds muffled by the thick meat. His nose finished darkening and turning into two nostrils that widened to drown in his brother’s scent, his shaft so close to his face. Chris’s rounded ears nestled higher in his head, covered by soft brown fuzz. His baby brother was fucking his mouth and he was loving t. The sheer excitement made his cock drool out pre that was thick as honey and strengthened his own scent in the room. It was thicker than ever now. The vents had totally stopped, but they were not allowing any of the musk to actually flow out. The big clear wall was starting to fog as it got hotter and steamier inside. David was growing more aggressive... biting down into his brother’s shoulder, tugging against it, clawing and scratching against the skin and flesh of his body. It was an animalistic need, nothing else. Fucking his brother, whom he loved, but loved like an animal now. Chris nearly came as David started to bite and scratch him. All the smells in the room mixed into a perfect cocktail of wild, animalistic sex. To rut. To fuck. To mate. That's all that mattered now. Innocent memories of Chris’s childhood and family were wiped away from his animal mind when he tasted David’s pre on his tongue. More... More... He wanted more. To pleasure David was his only goal in life. To show him his love in the most carnal way possible.
Meanwhile, David was already starting to get close a second orgasm. But this orgasm was going to be very different form the first. He was of age now. His balls were churning powerfully with sperm, enough to get a dozen bitches pregnant. He was drooling, growling and gruffing, getting close to that much needed climax. In a sudden and very climatic thrust, he howled to the skies above and nearly exploded, shaking the room with his cries as jets of thick, cloying, yellow-white seed splattered over Chris’s bear muzzle. The latter had readied himself somewhat when he felt David growing more aggressive, knowing that he was close. But nothing could prepare him for the size of the wolf’s orgasm. The bear swallowed all of that wonderful thick cum that he could, feeling euphoric with pride and lust and love: he made his baby brother cum. Inevitably however, David’s overflowing jizz spilled out of his mouth, to cover his face and flow over his chest and belly. So strong... So virile... Chris started thrusting into his paw as he neared his climax.
David dropped down to all fours, pawing around like a caged animal. He could taste his brother’s musk and arousal, and he felt restless. He wanted to be let free, to hunt, to fuck. He wanted to spread his musk around and change more people, no matter what it happened to take. The wolf was so desperate. And then he smelled Chris’s cock and balls. He started to move down toward them, licking them, wanting to help his brother as he was very aggressively stroking himself. Chris growled lowly and huffed rapidly in pleasure as he started to squirm on the floor. The scent of David’s cum overpowered everything else and he released his cock momentarily to rub his littler brother’s thick batter over his face, feeling the scent clinging unto his fur. He did the same with his chest; the bear wanted to drape himself in David’s musk, to show the world that he belonged to the black wolf, to have his scent in his mind always. Yes... Yes... It felt good to surrender himself to his brother. Chris was about to finish when he saw David getting closer, and what he would do. Human speech was now a thing of the past and the bear groaned softly and questioningly at his brother.

David was now getting closer towards the bear’s cock, sniffing it for a moment, before deciding to paw around him instead. His muzzle dripped down, towards Chris’s bear tail, and towards his ass. David’s cock, which had been lying somewhat limp before, had suddenly grown hard and needy once more. He knew Chris would surrender to him; the musk and seed being forced into his fur was thick and it told him everything that he needed to know. The wolf panted and wanted to mount his brother, hoping that his body language was showing this. 
When Chris felt David’s soft breaths on his ass a new, unknown desire took hold of him. His brother’s seed was like a drug and he was already addicted. The bear felt empty in ways he had never felt before, ways only David could fill. He felt ecstatic when he realized he could pleasure the wolf like a bitch. He got on all fours, presenting himself to David, moving his short tail in encouragement. David mounted him without hesitation. His fat, canine cock filled Chris’s asshole to the very brim. His shaft was throbbing, pulsing; the bear could easily feel the veins against it now. David was thrusting, using all of the muscles in his lithe but built canine body to show Chris how much he cared for him... and just how much he had lost himself. His muzzle came down, teeth digging into the bear’s shoulders, holding tightly, teeth sunken into the muscle. The longing in the bear’s yellow eyes was replaced by a blank stare as his muzzle hung open, drooling generously. At first, the feeling was weird, so weird and almost painful, a strange and unpleasant pressure. However, as David kept thrusting the pressure morphed into something else. The bear started to huff lowly by the overwhelming sensation, his cock beginning to drool once more.

David’s muscular forelimbs squeezed each side of Chris’s big body, holding him in place. The wolf kept thrusting, getting harder and more aggressive. The bear could even begin to feel that David’s cock was growing. Gradually enough it was getting larger, the knot getting fatter, filling Chris up to the very brim. David’s cum and pre was slicking him, making it easier to rut him as the wolf pleased. The pleasurable pressure against his prostate grew with the wolf’s cock. But it soon became even more pleasuring to Chris by the slickness of the pre. That bite had been delightfully painful and had made the bear crave more of David: he wanted his beloved baby brother to fuck him hard and make him cum like a bitch. He moved his big body along with the wolf’s thrusting as much as he could, joining the rut. The pointed tip of the canine shaft had perfectly thrust into his prostate. David was going to milk him. Milk him of absolutely all of the cum and pre that he could produce. He wanted Chris to be a good musk and cumslut, just like he was becoming.

Chris threw his head up in the air as he felt the tip pressing against his button just right, and released a low, rumbling roar worthy of a mighty bear as he came... A mighty, slutty bear, enslaved to his brother’s scent and cum. Chris’s thick cock pumped out several ropes of thick gooey jizz on the floor and against his belly. As he came his walls clenched and squeezed on David’s cock, inviting his own orgasm. The former boy’s third orgasm of his life was mind shattering. His muzzle rose up to the sky above as he let go. His balls clenched and rose up against his body. His ability to produce was spectacular... he was draining himself and filling Chris’s ass with seed, giving him a massive musky creampie that surged and dripped past his heaving shaft. Chris received his brother’s seed with joy, feeling how that sticky warmth spread inside him. David was a stud, a real alpha male, and he was his to fuck. What else could he want? Deep inside he knew David were still his little brother, but 'brotherhood' now meant a carnal, uninhibited love between them, and Chris adored that. He finally couldn't hold anymore and collapsed on top of his own seed, drenching his belly with it and mixing it with the wolf’s own, making a delightfully musky cocktail. The bear groaned contently, tongue lolling out and drooling over the floor. He felt David’s weight on top of him and instinctively knew they were knotted. His muzzle drew something akin to a dumb, happy smile: even better.

David was left with a stunned and very pleasured grin on his muzzle. His long drooling canine tongue hung freely from his mouth. His mind was dull, his thoughts gone for the moment. Instead he just focused on nuzzling the bear, finally feeling exhaustion set in after the aggressive and powerful transformation that had taken the two of them. Any thoughts as to who had done this or for what reason were gone, they were just animals now, nothing else than simply sex beasts.

A pleasurable tiredness came over Chris. He growled happily when he felt David nuzzling on top of him, wishing he could be unknotted for just a moment to return the favor. Nonetheless, Chris knew that David knew. The animalistic bond formed between them allowed for much more than hollow human words. They were dumbly, simply, happy.