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From the same setting as Getting Some Jack Ass but can be enjoyed on its own...

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The work, Calvin found, was just like his brother had described, except he didn't find it particularly boring, at least not yet. But he was new to this and it was only his first day on the job, unlike the two sons of bitches who'd been here before he was hired on to help. Not the way he would have described them since they seemed like a decent enough pair, but the Dobie and the Mastiff had introduced themselves as such. Not much older than his eighteen years, and judging by their mannerisms and their build they also didn't feel the need to continue their education once they got out of high school. They were casually crude, but amicable enough and they didn't seem to mind that the newcomer had to be shown how to do pretty much anything.

He supposed they were glad to have a horse on site. They were building either a big house or a small mansion for someone who did go to college, and wanted everything about the new building to look like it had been here for ages. Hence the shitload of reclaimed materials, ranging from bricks to roofing tiles and even the timber. And he wanted as much as possible to be done by hand, which was why Calvin supposed he was hired. If you had to cart stuff around, you needed horsepower, and the young stallion had plenty. Bruce and Carl were seriously big dogs, heavily muscled mainly from working in construction but he wouldn't be surprised the two worked out when they had the time. Looking at the muscle-bound canines one might guess they were stronger than the newcomer, but looks could be deceiving. The young stallion was a good deal taller, obviously athletic with a swimmer's muscles moving under a light-brown coat, but after seeing how easily he could cart around a wagon full of solid bricks, the dogs were happy to let the horse do the heavy lifting.

"Calvin, don't bother with that, we're packing it in for today..." Carl called out, as he and the Dobie took their dusty work-gloves off.

"Got it." The young stallion said. He was feeling a little run-down after a day of hard labor, but he was determined to keep working as long as the two canines did. They moved a trestle table under a nice shady spot and cracked open some beers as they dug into dinner.

"So, we got a.. y'now... mule coming in?" he asked, sounding casual about something he was very anxious about.

"Wish we did kid, but they don't usually hire one for a site this small." Bruce said, gnawing meat off a bone with canine gusto.

"Yeah, a job like this has decent pay but fuck all when it comes to benefits." the mastiff added, taking a few long swallows of cold beer before continuing. "So, I figure you know how this works out?"

"The arrangement? Yeah I'm... I'm fine with it. My brother works jobs like this and he explained it to me." he said, knowing that until someone new was hired on every night at the sight would be a pain in the ass. His namely, since he'll be expected to help the two dogs get the release a strong young male needed after a day like this. You bust your ass, then you bust your nut, and the newbie does the honors. His brother had warned him that if he was in that situation he was not to puss out. He said that it seemed weird, but the guys you work with will still respect you and treat you normal even after cumming under your tail, but not if you chicken out on the arrangement.

"Yeah, you got nothing to worry about. I mean, we've been switching it up before you came so I know for a fact Carl has a puppy-pecker..." Bruce said, baiting the mastiff who knew enough not to fall for it.

"You'll do fine hoss. Better than either of us would have done if we came in here after you..." the mastiff reassured him, and they left it at that as they finished up their meal.

*******

Back in the trailed, Calvin felt a little self-conscious as he took all his clothes off, even though the two dogs were doing the same. This part at least was just like the school showers, except for one notable exception. There was no mistaking the looks the canines threw his way, even though they were trying to be subtle about it. Both the mastiff and the Dobie were in their prime, the muscles hard and the flesh covering them still firm enough to show off every bulge. Next to them the Stallion looked a bit lanky, but it was obvious that he'd outstrip the canines in a matter of years. As it was now, the part of him that definitely put the dogs to shame was between his legs. The dark, smooth equine sheath was fatter, and the sack under it hanging heavy, which didn't make the young stallion feel better. After all, these two had nothing to worry about regarding what he was packing. But the dogs were both short-haired breeds, with not much to provide modesty and hide a pair of hefty canine sheaths, and swollen nuts that would be emptying themselves under Calvin's tail soon enough.

"Okay so how do we... do this?"

"Usually it's from behind, so it's your choice if you want to get on all fours. That way you can let one of us use your muzzle. Get through the whole thing faster..." Carl suggested, with the Doberman chuckling at the sour expression on the stud's face.

"Yeah, you're done sooner, but there's not enough mouthwash in the world, am I right?" Bruce said, but lighthearted attitude didn't do much to make Calving feel any less awkward about what was about to happen. "All right hoss, let's just keep it simple - brace your hands against the wall and just power through this. Just remember, clenching your teeth is fine, but do your best not to clench up back there." the Dobie explained, rummaging around until his paw closed around a big bottle of lube.

Calving did as he was told, bending over a little and spacing his hooves shoulder-width apart. The sound of the lube being squeezed out made his ears flick, and when cold slime pressed under his tail they folded against his head. A hand gently but firmly grasped the drape of long horsehair and pulled it up, revealing his dark pucker to the dog pressing a couple of thick digits against it. Her was just smearing the stuff around and rubbing it into the dark-grey ring, but Calvin knew it wouldn't stop there. He did his best to relax and take deep breaths, worried about looking like a scared kid in front of the two dogs, and had managed to relax enough for Bruce to stick a finger in. A dull, stubby canine claw went in easy, but the stallion felt the tip pry him open, the slime covering both it and his pucker letting the Dobie shove a knuckle in before he clenched on reflex. Bruce stopped pushing when he clamped down on him but didn't remove the digit, and once Calvin had relaxed he slipped deeper in.

The touch betrayed experience and staring at the floor of the dingy trailed the young equine had to admit it didn't hurt as bad as he expected it to. It just felt weird to feel something going inside him, and weirder when that something began to wriggle, poke and prod, the canine obviously determined to smear the lube as deep as he could up the young stud's ass.

He failed to muffle a hiss when a second finger slipped in, and could feel his body reflexively putting up a fight that it had no hope of winning. The canine had his tail hiked and the two digits buried in his ass soon began pumping in and out of the meaty black ring. Calvin grit his teeth as he recognized the motion of the thick, strong fingers - whenever he was with a girl who wasn't sure if she wanted to go all the way, slipping a hand under her skirt and doing what Bruce was now doing to him would usually get them wet and in a mood for something more than making out.

"All right, that should do it. Now just remember to relax as much as you can. Try taking deep, slow breaths. In then out, in then out, in..." the Dobie said, and the same moment the stallion felt something press against his now slippery pucker.

It felt wet, but not cold like the lube. This was something flesh-warm, softer than a finger but still hard enough that he knew he had no hope of keeping it out. A tapered canine tip easily slipped into the center of his anal ring, pointed end of the dog's cock giving a little throb and sending a squirt into the tense stud's ass. Calving was breathing deep, but his breath was quickening as his pucker spread again, this time enveloping something as smooth as glass and thick enough to make him wince. A glance to his right was enough to illustrate what it was being stuffed up his ass. Carl was keeping quiet but he was watching the two intently, and several inches of rosy-pink dog-meat were already sticking out of his sheath. He wasn't sure what to do, if it was rude or weird of him to stare at the mastiff's mounting arousal, but the massive canine seemed to have no inhibition staring at the young equine taking his friend's shaft.

"Ungh!"

"Try to relax. I don't mind a tight hole, but if you clench up this is gonna be rougher on you than it needs to..." Bruce said, a low growling creeping into his tone as he obviously savored the equine ring pulsing around a cock that was now stuck deep enough to stay in. But the real reason Calvin had grunted was that the tip of the canine rod had poked firmly against something inside him the fingers had only brushed against. It was a sensation he couldn't describe, but the word 'intense' would certainly apply. And when he relaxed enough to let the dog push more of himself in, he felt the hard mass slide against that weird spot that made his insides quiver and his... oh fuck!

"Yeah, don't worry about that. Almost every male drops a little while taking it up the ass. Just not enough room in the body or something. Doesn't mean shit unless you actually get hard and come like some sissy faggot..." the Dobie said, making Calving feel a little better about the soft but swelling equine length under him.

Bruce shot the waiting mastiff a brief glance, smirking as the kid bent over for him bought his explanation. It wasn't really a lie, and a semi-hard cock didn't mean much, but he had no intention of letting the mare-poker stay floppy. The colt was awkward but trusting, and as he relaxed that dark ring wrapped around the rosy length the Dobie made sure to feed him a few more inches of hard, throbbing doggy-dick. In these situations, the guy on top would be looking to just get his rocks off as quickly as possible, but he and Carl had something else in store for this kid. Unlike most guys in this situation they didn't need to pretend this was a female. The canines liked nothing better than to take a strong fit male and rail him just right until the poor confused bastard found himself lifting his tail as eagerly as a bitch in heat.

And the young stud pulsing around his cock would be the perfect mare soon enough. He could see the dark length swelling, inches spilling out as inches were pushed into the young stallion. The lube-slicked pucker would clench up every now and again despite his warning, and the Dobie knew it would wind up pressing the kid's prostate against his throbbing length. He doubted the colt had any idea what it was, or just how good a cock could feel as it pounded away under his tail.

When everything but the half-swollen knot was buried in that firm equine ass, Carl gave him a questioning look. Bruce considered his options briefly. The horsie was a virgin, but if he pushed in now he could still get his knot in. A tie with the brown equine would feel fantastic, and he could feel his cock twitch as he imagined that muscular ass clenching around him until it milked him of every drop. But once he was in he'd stay there, and he'd miss out on giving the colt a proper ride. He shook his head at Carl, which obviously suited the mastiff. He knew what his friend liked and had no doubt Calvin would wind up with a hard, heavy bone buried up his sloppy rear by the time the evening was over.

For now the Dobie pushed on the middle of the colt's back, forcing him to arch it and to throw his ass out a little. Still gripping that convenient equine tail he began to pull out, smirking at the groan the stallion failed to muffle as inch after rock-hard inch was pulled from his ass. That dark ring made a hell of a pretty sight as it clung to his shaft until there was only an inch or two still in the horse. His thrust back in was steady but still relatively slow, the buff canine sheathing everything but the knot in the span of two seconds.

"You okay?" he asked.

"Yeah... fine." the stallion replied, trying to keep his voice level. The kid was still trying to play it cool, but Bruce was confident he would brake soon enough. He'd just need to make that fat stallion cock spray...

"All right then..." he said, beginning to pull out and thrust back in at a steady, even rhythm.

Calving found himself biting his lip to keep himself from making any more embarrassing noises. He could endure discomfort, even some pain stoically and without mewling and whining, but he wasn't expecting to feel whatever it was he was feeling as the dog began to move his... hips. It was easier to think of it like that, easier not to imagine a thick red length stuck between his cheeks, stretching him out as the dog began to hump into him. Even though he was ready for it, and even though he'd been told it was no big deal, it still felt humiliating to be used like a female, with one dog thrusting into his ass while the other stared at the scene, stroking an impressive erection as he waited his turn.

He could never understand the fags that willingly raised their tails for another male and let them breed them, but as the hard doggy-dick stroked his insides he felt his body respond even though he wasn't aroused. He didn't like the idea of being fucked like a female but he wondered if the two dogs would believe him with his erection stiffening. Every time he clenched up on reflex something would press against the invading cock and cause his own shaft to swell and flex, the floppy black length under him getting harder and harder, making him worry how far it would get before the Doberman was finished with him.

Bruce saw Carl keeping his poker-face, but with the colt facing the wall he didn't bother. He grinned at the sight of the stallion's pride and joy getting hard from a nice, slow ass-fucking, wondering if he'd turn the boy into a mare by the time he was ready to pop. Didn't really matter though. Even if he dumped a batch of puppy-batter into this virgin equine ass before the stud blew his wad, the boy would be just sloppy and loose enough for the mastiff watching them to do his thing. The colt would pop tonight, and after he did it was all downhill from there.

Just the thoughts of the fun hey were about to have was enough to make his length throb and his hips pick up speed. To his credit, Calvin was taking it like a trooper and Bruce was giving him a lot to take. It hurt in more ways than one to let another male slide his cock under your tail, but the Dobie knew it wouldn't be pain that broke the colt. The dark length of stud-meat between the boy's legs wasn't swinging as wildly, a sure sign that the young stallion was getting hard. Like it or not, Bruce knew how to treat a bitch whether she was male or female, and was making sure that every time he drove his tapered tip in he grazed the little nut hidden away inside the equine ass.

With a growl he decide to stop trying to make the colt pop and just do what he was desperate to do. His knot was by now obscenely big and beyond any hope of slipping into the tight colt-pussy his red rod was reaming, so he settled for just slamming the angry red mass against the dark ring. The kid was doing his best to muffle his groans, but docking hadn't made the Doberman's ears any less keen and he could tell it wasn't just discomfort he was hiding. Don't worry bitch, we'll have you moaning by the time this job is done... he thought to himself, gritting his teeth as he felt his sack pull up. Since he wasn't tied he didn't even bother to slow down and just kept humping into the horse with short, sharp jabs as he emptied his nuts into what was so recently a fresh virgin piece of tail. The colt held a few spurts but without the knot in the slaps of canine flesh against an equine ass began to sound increasingly wet as every thrust pumped some of the puppy-batter from the stallion's tensed rear.

Calving had been biting his lip so hard he was surprised he couldn't taste blood. It hurt, but the distraction was welcome. It was bad enough having his tail-hole stuffed with another male's meat, and sickeningly strange to find himself being furiously fucked, but the worst part was when the cock embedded in his ass seemed to come to life. He could feel the thing twitch and throb and wasn't sure what was happening until things started feeling wet and messy back there. He knew that this was part of the deal, but he still folded his ears at the thought that he was being seeded, that the male had not only fucked him but had bred him like a bitch.

He supposed he should have been grateful the Doberman had spared him the knot. Carl was fully erect by now, and bulge at the base of the mastiff's red length was scary enough without thinking about what it would be like to have that thing get stuck in him, ballooning up until he was forced to take very drop. Then again, it might be the more merciful option. He knew that the fur of his rump was soaked, since the slam of Bruce's knot against his straining pucker has splattered his spunk all over, with a steady trickle running down his own sack to drip on the floor between his hooves. He almost sighed in relief when the massive canine finally pulled himself out, squirting a few last shots against a dark pucker struggling to close after the savage rutting.

"There... wasn't so bad, was it? But it might be a good idea to keep that tail up. I imagine it's hard cleaning it if it get's messy..." Bruce said, stepping away and admiring the sight of the colt keeping his soiled rear presented like a mare in heat. The now rock hard equine erection visible between his legs didn't spoil the illusion for the Doberman. If anything, it only told them they were on the right track to turning this stud into a bitch. "Holy shit hoss, you always get this hard? Then again Carl stroking a full mast so..."

"I'm no fag, but tail's tail..." the mastiff replied, keeping his hand on his cock and his eyes on Calvin as he took Bruce's place.

It seemed to be as much of a conversation he was likely to get from the buff dog, which Calving supposed was a mercy. He just had to let Carl do his thing, and then he'd shower and get to sleep. Tomorrow night it would probably feel less weird. He felt strong, heavy paws settle on his cheeks, sinking into flesh and muscle and the massive mastiff groped him Thumbs slipped into his crack, digging in as the canine pulled his cheeks apart and forced his ring to stretch. Calvin folded his ears as a fresh trickle of the Dobie's cum seeped from him, the warm seed failing to prepare him for the heat of the huge dog's erection.

Since he was already fully hard and out of his sheath, Carl had just dropped his enormous shaft into the cleft of the equine ass, rubbing the smooth, pinkish length up and down and smearing himself in the other dog's mess. He could feel the underside of the throbbing cock rubbing against his pucker until the tapered end slipped low and pressed against his leaking ring. Calvin steeled himself for what he knew what was to come, but to his surprise the moment of searing pain never came. Instead there was an obscenely wet noise as the push of the doggy-dick forced the Dobie's load from his violated rear, the still warm mess gushing around the smooth rosy length invading his ass. The Doberman in question had slipped into the bathroom and quickly washed his junk in the sink, but the purplish-red shaft was still too engorged to start slipping back into his sheath. To his horror he realized Bruce was smaller than what he'd seen Carl stroking, and winced at the thought of what he'd be liked after the even larger of the two males was done with him.

Bruce did his best not to grin at the sight of the colt, hard as a rock and scared shitless about what was going to happen, even though the Doberman was sure he had no idea. Hell, if he had he'd have quit the job and never let either of them mount him. He watched both the dark length of stud-meat the kid was packing as well as the rosy rod being packed into him. In spite of his little joke he knew full well Carl was better hung that he was, which was why he went first. But even with a batch of puppy-milk up his ass and that glistening pucker loosened after his first fucking, the kid would still have a hard time taking what the mastiff had to give.

He kept a close eye on the equine erection, now hard enough that it was pointing at the wall rather than the floor. The tip bobbed up and down just a little until the stallion took his third inch of thick hard canine cock and Carl's tip poked the spot that would turn the stud into a mare. The moment his friend hit the kid's prostate the tip flared and the whole length flexed, the equine pucker clenching at the same time and drawing a growling grunt from the mastiff mounting the teen's ass. Well, he warned the kid about clenching up. Every time he did that at his point would only rub his nub against the throbbing surface of the male mounting him, pushing him closer and closer to something Bruce was sure he had no idea was coming.

Calvin found himself taking deep, ragged breaths, surprised by just how much was being pushed into him. If Carl had gone first, he doubted he would have been able to take him quietly, especially when he started...moving. It was easier to think of it as that, even though he knew that this was fucking - he had his hands against a wall, his back arched, his tail raised and a male gripping his ass hard as he slid into him inch by sickeningly thick inch. And pain was only a part of it. There was still the problem of that spot, the one that made strange muscles in his body move and his cock flex and throb. He realized that part of him would have liked nothing better than to wrap a hand aground the dark length and stroke and squeeze until his balls were dry, but the idea of cumming with a guy nearly hilted in his ass was to humiliating.

There seemed no end to the canine cock being shoved into him, the tapered tip reaching spots inside him that even the Dobie failed to reach, but when he finally felt the hot mass of a knot pressing against his taut ring he allowed himself an sigh of relief. The moment of relaxation proved too premature, because the next thing he felt were dull-clawed thumbs prying him further apart before a buck slipped the knot into him. He hissed in pain before he managed to stifle himself, and hoped the satisfied groan of the mastiff drowned the noise out. His pucker felt like it was burning, clenching and pulsing even though it was too late. All it was doing was keeping the bulb of canine flesh in, where it stretched Calvin enough to alarm him.

When the thing was pulled out he was relieved in spite of the fresh sting, but as Carl began to rut him the still slender gland kept slipping in and out of him, aided by the sloppy mess of canine spunk being forced out of his over-stuffed ass. The mastiff's tempo was different - not the lighting-fast humping Bruce had subjected him to, but the sheer force of the slow thrusts was as alarming as the slap and tug of the knot moving past his sore pucker.

Watching from the sidelines, Bruce had to give it to the kid. The mastiff mounting him was giving it his all, tendons and muscles flexing in the powerful canine body as he rammed his cock into the only recently virgin ass, all without the colt crying out. The knot would slam into the puckered equine ring with enough force to dimple it, and the slinging tail-hole looked deliciously lewd when it hugged the swelling lump before Carl yanked it out.

And the thing was growing, enough to make the Dobie's own pucker twitch in sympathy. A minute or so later and even Carl's vicious yanks couldn't pull the knot free very time, but the sight of the equine pucker holding tight only made the grunting canine pull harder. In Bruce's opinion his friend was getting a little carried away, and risking having the fat rosy lump grow too big to fit into the young stallion.

Sure enough, the next few thrusts failed to drive the bulge in, even though the brown horse's wincing was evidence that the mastiff rutting him was doing his best. Carl was bucking his hips with enough force to make the kid's hooves scrape against the floor and to make the heavy equine erection slap against his belly, and even his chest. Fuck this mare is hung! Bruce thought, grinning as he imagined the mess those fat bitch-balls would pump out when the young stud came like a real butt-slut.

And the mastiff mounting him knew what it would take. The Dobie saw his friend dig his thumbs into the boys cheeks, his massive hands tensing as he stretched him as wide as he could before giving one final shove. It was forceful enough to push the stallion's face against the wall, and just enough to slip a third of the throbbing bulge into his ass. The mastiff growled and just kept on pushing, the muscles in his thighs bulging as the knot sank a little deeper with every second. Bruce held his breath as well as his cock, watching until the taut ring reached the middle and the thickest portion of the mastiff's bulge. After that all it took was one sharp buck, the colt failing to stifle a cry as the whole bitch-breaking knot was swallowed up by his ass.

Calving had been considering saying something to the dog behind him, like pointing out the knot wouldn't fit and that his friend managed to finish just fine without tying. But he was worried about looking like a whiny pussy, so he figured he'd just grit his teeth and let the mastiff work that out for himself. But that was _before_the throbbing lump of hard flesh actually sank in. Calvin could feel his washboard abs flexing and trebling, his breathing rapid and shallow as he tried to get a grip on himself.

Something was happening to him, and it wasn't just the pain of an already enormous knot growing bigger now that it had something tight and hot wrapped around it. The thing had settled exactly on that weird spot inside him, and instead of rubbing or nudging it was pressing right against it. Hard! Hard enough that the young stallion could feel the dog's heartbeat, a steady thud-thud against hat little nub inside him that was making his own pulse race. He found himself clenching down on some reflex, and that was so intense it made his vision blur and a groan slip from his muzzle before he could clamp it shut.

He knew what was going to happen. He'd felt it often enough, but it had always been with either a hand, mouth or pussy wrapped around his cock. He could feel his shaft flex, the same muscles causing his insides to wrap around the invading length and throbbing knot, which only rubbed the right spot harder and caused his erection to bounce again. Carl was just grinding against him, the enormous hands groping his ass as the dog gave a low rumble he could both hear and feel.

Before he could even think of a way to stop what was about to happen the stallion felt his tip flare and his sack pull up until he could feel the mastiff's nuts brushing against his own. Disgust and shame were washed away briefly along with all reason, his nostrils flaring as his erection went completely rigid. He felt his shaft throb and could see the trumpet-like tip spew a pearly white stream against the wall he was braced against.

"What the fuck... holly shit, the colt's cumming!" he heard the Doberman remark, and flicked his ears back in a brief rush of shame.

There was no hope of hiding the fact. He was cumming and cumming hard, releasing stream after sticky stream of stallion-spunk as his insides clenched and pulsed around the beast buried under his tail. A final growl of the mastiff filled his ears a second before the big dog's cum began to fill his ass, a hot steady stream of puppy-batter that had no way to go but deeper in. His ass was sealed off tight by the swollen knot still pulsing against his sensitive spot, the whole length of the canine cock twitching as it seeded him as if he were a proper bitch.

"Didn't even know this was possible... he never even touched himself, and look at him go..." Bruce said, confident in his act.

He'd seen this happen plenty of times, but it was always an impressive sight to see a male made into a bitch. Horses generally put on a good show, and their new mare was no exception. The end looked like a purplish-black mushroom, still spewing thick milky horse-cum as the former stud took every drop of an equally impressive load.

"Shit man... first time I've seen a guy cum while getting topped..." the Doberman said, seeing the colt wince with every word.

"Me neither. Seen plenty of bitches do it though..." Carl replied with a growl in his voice as he continued to empty his nuts into the tight equine ass he was now firmly stuck in.

"I'm not a bitch..." Calvin replied, in a weaker voice than he would have liked to. The tandem fucking and his own orgasm had left him too exhausted and confused to speak up for himself.

"Never said you were kid, but why did you cum like one?" the mastiff said, pushing just a little deeper into the stallion's rump and drawing a less than masculine sound from his muzzle.

Calvin tried to reply, but he couldn't think of anything. There he was, pressed against the wall smeared with his own cum, a wad he'd blown from nothing else but having a big heavy dog fuck him the way he would a bitch in heat horny enough to lift her tail for that mammoth cock he was packing. With nothing to say, the colt just hung his head, staring at his still firm shaft as he waited for the mastiff to finish breeding him...

*******

"C'mon colt, open up for me... don't pretend you don't want it..."

It was the Doberman teasing him, leering down at the brown stallion stretched out in front of him. Calvin couldn't bother denying him. The brown-orange dog had just finished stuffing everything but his knot into his ass and he was already erect, his dark cock hard enough that it was no longer resting against his abs. He did his best to avoid looking the Doberman in the eye and to relax the pucker pulsing around what should by now be a familiar canine length.

"Ngh! There we go..." Bruce said with a happy little growl, grinding against his rear a little before he tugged what was still a fairly slim knot out. "Don't worry, I'll make sure to tie. Don't wanna miss out seeing that mare-cock spray, do we?"

The words stung even though part of Calvin was looking forward to the tie. It had been a week now, a week of having his rear rutted by two big dogs every night, and he was still confused. He knew he was still attracted to females, and promised himself the first thing he'd do with his pay once the job was done would be to hire a hooker and a room and leave both wrecked and messy, just to remind himself what he really was.

But while he was here, it was hard to deny what the two dogs called him every evening - a fag, a filly, a bitch. And how could he prove them wrong when he kept cumming like a fire hose from nothing but a cock pounding or a knot throbbing under his tail? He was sure females - canine or equine- would salivate at the sight of the two buff canines working up a sweat, but lying with his back against a stack of cement sacks he had a pretty good view of the crop-eared canine humping into him, even though the legs resting against Bruce's shoulders were hiding some of the Doberman's chest. The sight of a naked male, even one he knew was handsome didn't arouse him, but the feel of one inside him was a different story.

A few days ago they'd stopped fingering him before they started. Now they just settled for rubbing lube over a pucker that - to Calvin's horror and shame- would actually be winking by the time they were done. And if he was being honest, he didn't need the foreplay. He'd gotten used to taking a cock under his tail, and didn't feel even a twinge of pain unless one of the two got carried away and gave him a particularly vigorous knot-fucking.

He wished the pain would come back. Without it there was only the sickening pleasure of his body caressing a hard red invader, molding itself around a cock as eagerly as a botch or a mare would. His cock would now drop at the sight of red rods peeking out of fat sheaths and when things got far enough along he didn't bother stifling himself, groaning and panting like a whore while the two dogs used him like one.

He'd have to do his best now. The two had started fucking him outside, insisting he made too much of a mess every time he came. Neither the boss nor the delivery people came this late in the evening, and the site was way out in the country-side, but he was under flood-lights and very much exposed to anyone who got curious about what was making those noises. But even if he kept quiet, there were still the meaty sounds of hard bodies colliding, the Dobie rutting him with enough force to make the stallion's sack bounce back and forth as the bobbing tip of his cock left telling stains over his chest.

"Fuck, don't think I can wait tonight..." Carl said, walking above and behind the prone colt. "Tip your head back and open wide kid..." the mastiff said, pushing his sheath back and revealing every last inch of a cock leaking hard enough to prove he wasn't lying.

"But I-anghh!- I don't..."

"Don't what? Like sucking cock? Well you didn't know you liked getting fucked like a sissy before you tried it. So quit your bitching..." the huge dog said, ironically since he was asking the young stallion to act like his bitch.

Calvin considered drawing a line in the sand, but any willpower he might have summoned up was gone when a particularly sharp thrust from Bruce drove the knot in and jammed it against his prostate. The sound he made drew laughter from the two males, and the next thing he knew he was tilting his head back and meekly opening his muzzle. The smell was familiar by now - sharp and male but not the sort of thing his nose would pick up in a locker-room. It was the smell of lust and rut, and as the red tip was pushed passed his lips he realized the taste was about the same.

"There's a good mare. Just open wide and keep those teeth out of the way..." the mastiff growled, his shaft leaking like a broken faucet as he slid himself steadily deeper.

Being a horse Calving had a long and pretty spacious muzzle, but even he found his jaw straining when it became clear Carl intended to push the knot into his mouth and he had to fight an urge to gag when the squirting tip brushed the back of his throat. The mastiff paused there, with his heavy sack pressed against the colt's nostrils before he grabbed the sides of his head and began to slide out. Soon enough he was fucking the stallion's face, the canine sack slapping against the equine's nose as he struggled to swallow. It was a steady and mercifully gentle pace, but he was worried. Bruce would hump away like a feral dog most of the time, but the mastiff would get carried away every now and again and really give the colt everything he had. It would leave the stallion sore, but to his shame it never failed to make him cum when the huge dog railed his tail with every ounce of strength in that muscular body.

"Shame the filly can't watch herself cum now, but that is pretty fucking hot!" the Doberman said, doing his best to cram his rowing knot back into the equine ass straining against every thrust.

At this point Calvin didn't need to see it. He knew what he'd see - the painfully hard shaft swelling up, the little tube in the blunt tip sticking out just before a torrent of equine spunk was sprayed over the dirt or over him. On and on it would go, as if the cock jammed up his ass was somehow squeezing the cum out of him. He was already close, close enough not to feel shame at enjoying what was coming. He did his best to relax, hoping Bruce would manage to knot him. The Dobie could make him cum either way, but se realized soon enough that nothing could compare to cumming while you were tied, and the way that every flex of his shaft would make him milk the one stuck up his ass.

"Unghhh! There we go!" the Doberman said after finally managing to drive his knot past the colt's pucker.

Bruce kept humping against him, even though he was stuck, the cock moving just an inch or so within the stallion's straining rear, but enough to make the stallion's eyes cross as the tugs and shoves made the swelling knot rub and press against his prostate. His nostrils Carl's sack was slapping against were flaring and the colt was moaning around the cock fucking his muzzle, distantly aware of a hot, wet rush filling him a few moments before he came. The night air was cool and his cum felt hot as his throbbing flare began to spew ropes of it all over his chest, every flex of the equine appendage making his ass clamp down on the dog breeding him.

He was still trying to get his breath and his senses back when he realized Carl wasn't fucking his mouth in long, languid strokes anymore, nor were his nuts slapping against his nose. They had pulled up, looking ready to burst which he knew they would in a sense be doing. The mastiff's knot had swollen up behind his teeth, and if the dog had been willing to give him a choice whether about swallowing his first ever load, it was no longer in his power to give.

"This thing's not getting out anytime soon colt, so you either drink or drown..." the huge dog growled.

The stallion had still been straining to take what Bruce was pumping into him, his lean body bloating just a little as a virile male emptied himself under his tail. He could feel the bigger of the two doggy-dicks throb against his tongue, and figured he was lucky the tip was too far back for him to taste the mastiff's load. The force of the first squirt of canine cum surprised him, his throat closing up as he choked around the throbbing length of dogmeat. But Car's sack was twitching now, spraying a steady stream of puppy-milk into the stallion's muzzle. His mouth was soon flooded with the warm, watery spunk, the taste of it salty and bitter against his tongue, heavy with the scent of a rutting, breeding male.

He felt a hand on his throat, rubbing up and down and to his shame helping trigger his reflex. He soon found himself gulping the goo down, just barely avoiding having the canine jizz squirt from his nose. The two were joking, laughing at how thirsty he was and how they'd soon have him trained to drop to his knees and suck them dry. And with one male spraying his load down his gullet and his ass still milking the other's throbbing cock, Calvin wasn't sure they were kidding. Or wrong...