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"You ASSHOLE!"

The door burst open with such ferocity that the walls shook, knocking a bunch of Roland's anime figurines off their shelves. The boy jerked out of bed with such a start that he almost flung his sheets clear across the room.

"You little fucking SHIT! I'm gonna kill you!"

His older brother stood in the doorway, a picture of absolute rage. It was obvious he had only just woken up, clad in only his boxer shorts so that every smooth muscle was to be seen. Roland couldn't admire them, as he had so often. He was too afraid. He was getting some vivid flashbacks of fraternal conflict in the past.

"No! C-c'mon Cliff, I didn't do anything! I swear!"

In embarrassing contrast to his handsome jock brother Roland was lanky, skinny and just a complete dork. With college coming up in a month he had recently switched to contacts in some effort to improve his image, but it did little to help. The last vestiges of teenage acne clung tenaciously to his face, and his buck teeth stuck out awkwardly whenever he smiled. It was little surprise he was still a virgin.

"You gave me your-" Cliff hesitated, then suddenly seemed to gag. "The fuck is that smell?"

The younger boy didn't reply, standing now with his back to the wall like a deer in headlights and starting to flush blotchy red all over his face and chest.

His room was always pretty funky. A minefield of dirty clothes was strewn across the floor, and a couple wadded up tissues tried to hide beneath his computer desk. Roland knew exactly what his brother was talking about, though, and it was none of that.

"Damn, dude, that's fucking nasty!" The jock covered his nose with a hand, but didn't seem to make any effort to leave. His blue eyes scanned the room before they finally fell on the crotch of Roland's tightey-whiteys. A forest of greyish animal fur spilled out over the top, creeping up in a triangle towards the boy's navel and discolouring his skin slightly on its borders. Worse, the tip of something pointed and bright crimson was bulging out the waistband. "Aaw, sick. You were jacking off with that thing?!"

If Roland blushed any deeper he would have surely passed out. His family already knew about the strange appendage that had replaced his cock. The unlucky dork had come down with a bad case of 'Canitis' a couple of weeks ago. Though usually sexually transmitted he had, it seemed, contracted the disease from dirty sheets while volunteering as a guide at summer camp - something his parents had forced him in to, to 'get him out of the house'.

The disease certainly wasn't fatal. Fatally embarrassing, perhaps, but not fatal. What it meant was that instead of his usual endowment he sprouted matted, canine fur around his groin, grew a fuzzy sheath and sported the thick, knotted rocket of a common mutt.

The appointments with the doctor had almost made him want to die right then and there, especially when he popped a cheery doggy boner the moment the studly doc prodded his sheath. The thing stank like a shaggy mongrel no matter how many times he showered and, maddeningly, it made his libido soar. It was as though it _demanded_attention, much to the spotty nerd's chagrin.

The doc had given him some powerful cream to use on it every morning and night, and for the first couple days Roland had been committed to getting rid of the thing. Yet, as the time passed, and his plump canine nuts filled with their fresh brand of goo, he found it more and more difficult to resist jerking off. It was inevitable that eventually his willpower caved and one day, having waited until he was sure the house was completely empty, he put on his favourite Porn-Tube vids and gave his shiny new bitch-pounder a whirl.

It was love at first touch.

With a fist wrapped white-knuckled around his knot he came harder than he ever had in his life, staining the carpet, his desk and the wallpaper with rich dog jizz. He had goosebumps for hours.

So, after that Roland thought it wouldn't hurt to keep his new toy a little while longer. He had the medicine, after all. He could get rid of it before college. Why not enjoy it for now?

That plan had evidently backfired, however. His muscled jock brother, home for the summer, was touting a tell-tale mass of snowy white fur on his belly too. Seemed like Roland had unwittingly spread his gift.

"You're not supposed to touch it! Shit. N-no fucking wonder I've got it now too." The anger in Cliff's voice faltered, but he tried to keep it fierce. He watched as his younger brother made a desperate attempt to cover himself up with some dirty rag clutched in his hand. "What's that?"

Roland glanced down. Oh, shit. He was still holding it. Quickly he hid the rag behind his back again, as though the big jock would magically forget about it.

"N-nothing. Just, uh-" His mouth was already dry, but something caught his eye that stole all his words entirely.

The front of his brother's boxers were beginning to bulge. Just a twitch at first, but soon unmistakeable.

Holy fuck. Was his brother chubbing up at the sight of his dick? That would have been, like, a dream come true. The number of times the skinny nerd had jacked it over his bro's hot body was too high to count.

Then it hit him. It was the smell!

In his eagerness to experiment with his super-sensitive doggy cock Roland had come up with all kinds of inventive ideas. This most recent one? A bottle of musk. Bitch-in-heat flavour.

He had bought it online from a breeder's market, and damn if it didn't work like a charm. A couple spots on a rag he'd made from an old shirt was enough. One sniff set a fire in his furry balls the likes of which he never knew he could feel. It made him so aroused that he could cum and cum and cum until his knot ached - which is exactly what he had been doing for the last two nights. Holed up in his room, snorting dog musk and dropping payloads of sticky sperm all over the place.

It was obvious that now Cliff had his own red rocket to deal with, he could appreciate the scent too!

"It's, uh. It's this." The nerd mumbled, lifting up the offending bit of cloth. A small, devious idea stirred beneath his shame.

Cliff scowled at it. "Ugh. What is it? I can smell it from over here."

"Smell it. It's, uh, it's not so bad up close."

The jock eyed him warily, not seeming to notice his own pecker creeping up out of its confines. After a moment he trudged over. Such was the power of that enticing stink.

"Here."

The rag dangled in Roland's outstretched hand, and his brother snatched it for himself. He glared at the scrawny nerd, then brought it up to his nose for the most tentative of sniffs.

The effect was instantaneous. Cliff recoiled, then snorted and gagged. "Sh-shit!" Roland knew exactly what his brother was going through, and his eyes were locked on the jock's straining boxers.

The chubby, canine dong that lurched out through his brother's waistband was bigger than his own by a good way. It wasn't a surprise. He knew his brother was a stud, and the change just exaggerated everything.

"Oh, shit, Role. What _is_this stuff?" The buff jock groaned, tearing his eyes off the rag to look at his throbbing cock with desperate dismay.

"I got it on the net. It's like, you know, Viagra or something." The nerd made up something his bro would understand. No point telling the truth. While he spoke he watched with glee as his brother took another, slightly longer sniff.

"This stuff-" Cliff snorted again, his voice husky in his chest. The scent had him enthralled. So much so that he seemed entirely unphased that he was hard as steel right in front of his little brother. "Damn, dude!"

"Yeah, Cliff. This, uh, dog dick stuff isn't really that bad."

"Fuck off."

"No, seriously! I could, uh. I could... You know. I could show you, if you wanted?" It was time to roll the dice. The spotty nerd couldn't believe it, but if he was ever going to get in his brother's pants now was the time.

Cliff paused, intense blue eyes fixing his brother with the most cutting of glares despite the deep lust-red flushing his face. "What the fuck? No. Don't be such a little fag."

"N-no! For real. It's crazy how good it feels." Roland spluttered, "I don't want to touch your dick or anything. I'm not gay." That was a lie he was used to telling, "I mean, I've just had, y'know, _practice._I want to show you what stuff to do."

Awkwardness was familiar territory, but even Roland felt particularly on edge in the silence that followed. Eventually that scent must have won out because Cliff scowled and shrugged.

"Fine. But if I catch you looking at my dick your head's going in the toilet." The jock's heavy body came down on the bed with a thump, that rag still held near his face as he sat there and glowered.

"Alright. No, uh. No problem. Just watch." Hooking his thumbs over the top of his y-fronts the skinny dork swallowed dryly, then pushed them down to his ankles. With his hands on his hips he looked down with a nervous grin, perversely proud of what he was packing.

Eight fat inches of cherry-red doggy dong jutted from his groin. It was so shamelessly bright in colour that it seemed to glow like a beacon, and bobbed in time under its own heft with the beat of the nerd's pounding heart. It would have been lewd as hell on anyone, but on Roland's lanky frame it was beyond description. Enough to make even a soldier blush.

The whole thing was surrounded with a mat of coarse grey fur, coating his plump nuts and his inner thighs thickly.

Cliff's scowl didn't budge, but he watched with quiet sniffs, barely able to keep his fidgeting hand from his own prize prick.

"I've done some research. Th-this is the sheath." Pinching his cock gingerly in two fingers he lifted it to point to the furry skin wrapped tight around his base. "When you're not hard your, uh, your dick goes in there completely." When his brother didn't respond Roland continued, "It's kind of hard to explain how to jerk off. The bottom kind of swells up and, uh. Well, I could... Show you?" His voice cracked at the end, making the nerd's cheeks burn again before he quickly added, "N-no homo."

After a moment the big jock shook his head, then grunted. "Yeah, fine, whatever. Just hurry up."

Elation! Sweet, potent lust bloomed in Roland's chest and it wasn't just the musk this time. He was about to jack off in front of his stud of a big brother. He was really going to do it!

"A-alright! Here we go. Hold on tight!" He snorted a laugh, his enthusiasm bubbling over a little too eagerly. He caught himself, though, when he saw his brother's glare. "I mean, uh. Yeah."

Roland took a slow breath then, without further delay, began to jerk it for his bro.

Long, slow strokes got him going. Almost immediately he began to spurt jets of smelly, watery pre that he made sure to catch in his palm for lube. Soon his happy puppy pecker was shiny, wet and making the most toe-curlingly delicious sounds.

"I-it feels really good." He huffed nasally, stepping out of his underwear so he could broaden his stance and jut his hips out. That pointed doggy fucker was about the most robust thing on him - nice and thick compared to his skinny limbs and bony knees and elbows. As he worked himself up he licked his buck teeth, eyes locked so tight on his own efforts that he almost forgot he was putting on a show. "Ooh, yeah!"

It didn't take too long before he was nudging the line towards orgasm and his knot began to swell. As soon as it did he used his free hand to grip it in just the way he liked, playing his gleaming prong like an oboe. It felt so intensely good, the squeezing and tugging on his broad knot sending tingles all through his groin, even into his asshole, which clenched tight. It was only his brother's voice that snapped him out of the looming cum-spiral.

"That's it swelling up?" The handsome jock's voice was deeper than Roland had ever heard it.

"Y-yeah." With a great effort he managed to stop pleasuring himself, holding his cock for Cliff to see. "This is the knot." The panting nerd stated, regurgitating facts he'd read online, "In dogs it- it swells up to lock the male to the female while he impregnates her. That's called a 'tie'. If you, uh, make it feel like you've tied by using your hands like this," He held his knot again gingerly, making sure to show where each of his fingers went. "Then you cum really, really hard."

"Yeah?"

"Yeah." Roland was almost at it again, barely able to keep his fingers off his dick. After a moment he added, "The bottom of the knot's the most sensitive part, where it goes really narrow, but I like to, uh, squeeze the whole thing pretty hard when I cum. Feels, uh- Feels, uh-..."

His brother was jacking off. Cliff was huffing straight from that rag and his meaty fist bounced up and down the straining bitch-wrecker towering up from inside his boxers.

Roland had to let go of his dick entirely. He would have shot in a second.

"Y-you feeling it, Cliff?"

"Yeah... Shit..." The big guy paused to hook his boxers under his nutsack before going at it again.

Holy shit, his brother was hung. The 'disease' added a couple inches, but Cliff's huge cock must have been pushing ten. Unlike the nerd's own cheery pud the thing was a deep, fiery red and the fur around it clean and pure white. A real alpha's breeding tool. The thought made Roland's mongrel dick surge steely-hard for a moment before going back to its regular throb.

"Why don't you-..." The skinny nerd paused, not sure if he would get away with it even now. Lust won out in the end, though. "Why don't you let me do it? You know. Because, uh, I'm really good at it... N-no homo."

His jock brother didn't respond for the longest time and for a second Roland thought he was really in for it. In the end, though, he found himself ogling in disbelief.

"Alright. Shit. Just-... Show me how." The bed creaked again as the jock stood, stepping over to his brother and taking another deep sniff from the cloth. "Fffuck... Yeah. Just do it."

Oh fuck, oh fuck, oh fuck.

This wasn't how he had ever fantasised it would go, but it was really going to happen. Roland was finally going to do it!

Their spurting, canine cocks hung side by side, pulsing away. Even in this his brother had him beat, but damn if Roland didn't care right then. He moved his hips so those fat dongs bumped one another rudely and a tingle rushed up his spine. When Cliff didn't do anything, only huffed heavy-eyed from the rag, the skinny nerd took the opportunity and put their dicks together.

Both of them were so hard, so solid. He needed two hands to really hold them tight, awkwardly working them with little success. He didn't care. The panting dork didn't need to jack it, just the feel of his brothers hot crimson cock against his was enough. They squirted thin streaks of pre into each other's crotch fur the whole while.

"C'mon, dude. Do it like you were jerking yours."

Roland nodded. His brother hadn't knotted up yet, so spat into his trembling hand before gripping Cliff's eye-wateringly thick shaft and pumping it up and down. The pleasure that gave the big jock was obvious. His brow knotted and his beefy abs flexed, pushing his pulsing puppy-maker through the slippery grip squeezing down on it.

"Shit dude- Awh shit."

They continued like that, Cliff humping his brother's hand with wet slicks until a tightness at the base of his shaft heralded the blossom of his first knot. Roland didn't notice right away, though. He was eyeing the cloth gripped in the jock's mitt.

"Hey, Cliff. Lemmie smell that. C'mon." His words went entirely unnoticed. His burly older brother just kept it held to his nose, eyes closed and lost in a world of doggy bliss. "You've had it the whole time! C'mon. Before you blow!" Though Roland knew it was almost a futile effort he grabbed his brother's thick wrist and gave a tug. Then another. Then a long, strong pull.

The jock's arm budged, but only barely prised away. In his eagerness for a sniff Roland leaned forward, taking deep whiffs from what little he had uncovered. This put them almost nose-to-nose, and the angle made the nerd pause his eager cock massage as he got his fix of canine musk.

At that moment, as if spurred from his daze, Cliff's icy-blue eyes opened a fraction. It must have been instinct or sheer, overwhelming arousal that brought on what happened next, because Roland knew the guy was straight as an arrow. Whatever the case, the handsome jock pulled the rag away and, in barely an instant, locked lips with his little brother.

Those buck teeth clicked clumsily against Cliff's pearly whites, and Roland's eyes flew wide.

His first kiss!

Oh, shit! His first kiss!

The spotty nerd's first impressions: It was wet, and it was warm and fuck it was perfect. His brother spared him no gentleness, pushing his thick jock tongue inside with the kind of hunger he would normally reserve for the most gorgeous of slutty girls. An explosive prickling ran across Roland's skin, making every hair stand on end. When he finally overcame the shock he pushed his whole body into the kiss, his own tongue surging forward to wrestle his brother's with powerful, reckless passion.

Both of them were so far gone with their canine lusts that drool inched from their clashing lips, the sloppy sounds rivalling anything Roland's hand had wrought on either of their fat dongs earlier.

"Damn. You're hot shit, little bro." Cliff was the one who broke away, obviously, and gave a dopey grin, open-mouthed. He had never called Roland 'little bro' in his life, but hearing it now just felt right. "C'mon. Make your brother feel good."

The skinny nerd almost came right there at the sound of those words. Damn, growing a dog dick had really done a number on the big guy. He seemed lust-drunk, entirely at the whim of the blazing-red torpedo straining at his crotch.

Still, Roland didn't need telling twice. When he returned to his brother's cock he found it fully knotted, primed to fire. All he had to do was give it the right sequence - that perfect grip - and soon Cliff would be cumming as hard as he ever had.

"Ooh, fuck! Yeeah, dude. That's it! That's fuckin' A!"

Cliff was up on his toes, urging his hips forward into his little brother's hands. One set of thin fingers grasped that bulging, bloated knob of canine flesh just right, while the rest piston-pumped the wet shaft mercilessly.

"Oh, that's it! That's it! M-my fuckin' knot!"

Every smooth, beautifully defined muscle flexed on the big jock's torso, a burly arm sliding around Roland's shoulders for support as his throbbing puppy pud lit up with electric pleasure.

"My knot! My knot-!!"

Cliff's face twisted in perfect agony, his vein-bulging knot squeezed tight in his brother's hand as, finally, his whole world burst into light.

Grimy, off-white hound-syrup erupted from him in such a thick jet that it made an audible 's_qrt!'_ as it surged from his pointed tip. The heavy splatter that followed was even louder. The jock barely moved as he spurted and squirted, impregnating the phantom bitch he was tied so firmly inside. Roland was the one who whined. He could feel that cock strain with every long jet, almost rumbling in his grasp with the strength of the stream.

Oh shit. It was so fucking hot. He needed to cum now.

Yet despite his raging arousal, he waited. He eased his brother tenderly through the big jock's orgasm, milking that bulbous bitch-hammer with the gentlest of tugs until the alpha dog was whimpering and dribbling his last.

Roland had never seen his big brother so vulnerable. That was it. That was all he could take. Slicking his own dick with his brother's final ooze of spunk he really went to town.

The nerd was no stud, unfortunately. He came only seconds after grasping his misshapen prick, leaning back with his knees wobbling as he held his bright, apple knot in a death-grip.

"Oh god! Oh god! Cliff!"

His mongrel meat blew like a geyser, skinny body hunching as he unloaded his own offering of slimier, more pungent doggy spunk.

"I'm cuuuumming!"

Every rope painted his brother's bulging muscles, glazing the jock's torso with greasy puppy-batter. It was hot and plentiful and covered him so generously that it ran in thick streams to soak into his crotch fur.

When the gasping geek was finished, still jerking and twitching with aftershocks of pleasure, he kept his cock held tight and eased his head back, eyes closed.

"Oooh damn, Cliff." He teased his tip and twitched again before a whole bodied shiver worked itself from head to toe. After a moment he gave a long, snorting laugh. "See? It isn't so bad, is it? Man, we've still got like a month before college starts again. We could do this, like, every night."

When there came no reply except for the wet sound of his fingers on his prong he opened his eyes. "Cliff?"

The jock was standing there, creamed like a donut. Gooey spunk dripped off his brow, down his cheeks, off his chin. That detracted little from the look of sheer murder in his icy eyes, though.The sight made Roland's blood run cold.

"...You're fuckin' DEAD you little asshole!"