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By the time Kassam returned home from a 12-hour day filled with meetings, meetings, and more meetings in between work sessions, research sessions, and testing sessions, he was almost too exhausted to venture down into the dungeon to check his captive's progress. But once he'd changed into his comfy clothes and put some food in his stomach, Kassam had just enough energy to tiredly troop down the stairs and turn on the lights. What he saw made him instantly glad he'd forced himself to come back to the dungeon.

All 30 inches of the horse dildo slid in and out of the Border Collie's gaping ass like a well-oiled piston, pulverizing his guts so fast that Kassam was sure the canine's insides had been completely obliterated. Globs of creamy lube stretched along the length of silicone as it drew out of the dog before gliding back inside up to the hilt, punching against the swollen, puffed out lips. The canine's rim was almost unrecognizable, the sphincter hanging loose and barely contracting around the massive pole. And the fuck machine kept going, never faltering in pace, all while the dog moaned again and again through the gas mask, clearly in heaven as he was filled to the brim. Urine spurted uncontrollably into the tube connected to the urethral sound still lodged in his cock, his prostate had to be so overstimulated that the slightest touch could make it explode, and the dog only wanted more...more....more...

Kassam's mouth immediately began watering at the sight. It took so much self restraint not to yank out the dildo and fuck the dog's loosened hole himself, not to blow a load deep inside the canine right then and there. He licked his lips and his dick twitched in his gym shorts--his predatory instincts wanted to take over, to demolish the dog's ass with his cock even more. But as he watched the Border Collie's ass eagerly swallow the oversized equine dildo again, and again, and again, and again, Kassam knew he had to delay his gratification by just a little bit longer. He'd formulated a plan for this pup and was determined to see it through before granting himself relief--forbidding himself from getting off until his task was done made him want to work that much harder to ensure the Border Collie would be the most perfect, most depraved, most hedonistic bar dog he could make. And his own pent up and boiling sexual frustration would be motivation enough for what he had schemed for tomorrow; Kassam had big plans in store for the unsuspecting dog.

The following morning started with Kassam firing off an email stating that he was taking some much-needed time away from the office--after a busy day like yesterday, he could afford to use some of his accrued paid time off, although he certainly wouldn't be relaxing on his couch. Instead, after a fortifying breakfast and a couple strong cups of coffee, the tiger descended the stairs to his dungeon once again, ready to start the next phase of the Border Collie's physical training.

"Morning boy, how'd you sleep?" Kassam called as he turned on the dungeon lights.

The room was exactly as he'd left it: used toys, tools, and restraints still lay on the floor along with his and the Border Collie's discarded clothes. And the canine was still strapped to the fuck bench, the machine behind him going strong and plowing his ass with the oversized dildo just as it had been all day yesterday and all night after Kassam had gotten home. The Border Collie jostled back and forth against the cushions he rested on, his fur rubbing against the leather the same way it had been for the past 24 hours. The dog's hole now looked so deliciously loose and sloppy, Kassam almost wanted to turn off the machine and viciously chow down on the puffy rim, but he held himself back, determined to follow through with his plan for the day.

"Oh, that's right, you didn't," Kassam continued, approaching the dog.

After another night of nothing but more mental conditioning and nonstop pounding from the fuck machine, the canine on the fuck bench had truly become nothing more than an eager dog with an insatiably hungry hole. When Kassam inspected the conditioning kit, he saw that the tank of N0SHyP gas had run out, but he knew that the dog didn't need it anymore. The personality imprint had more than embedded itself in the canine's much emptier melon by now, and the diverter in the gas mask had automatically switched to a constricted air flow from the rest of the room, meaning that the dog had still been operating on less oxygen overall. But as Kassam saw the canine's stiff, throbbing cock hanging down--urine still listlessly trickling into tube connected to the urethral plug--he knew that the dog had loved every second of struggling to breathe while his ass was continually pounded without a shred of mercy.

Kassam roughly patted the back of the dog's head through the rubber gas mask, getting his attention--instantly, the Border Collie's body shook and wagged from side to side while his masked face was still firmly planted in the head cradle. "Let's get you out of that mask, you've learned all you need to know for the rest of your life, you dumb mutt."

When Kassam switched off the mental conditioning media and electrodes, the gas mask fell silent and dark for the Border Collie--all he could hear was his own breathing through the tubes in his nostrils and his master's footsteps. Then he felt the mask at the back of his head loosen--he couldn't contain himself and began wagging his body from side to side in his bindings again.

He was so excited, he would get to see his master at last! He loved being in the mask, but he loved getting to see his master--in fact, any master--even more. His breath rate picked up, and his body wagged even harder in a restrained frenzy. Oh, the anticipation was killing him, how much longer would he have to wait? The rubber was crinkling and squeaking loudly in his ears as he whined around the gag in his mouth while swallowing his piss at the same time.

Kassam rolled the mask forward and the Border Collie instinctively lifted his head from the rubber snout, letting the thick gag slide out of his muzzle. When he looked up and opened his eyes, the dog blinked happily in the bright light; his eyes were no longer full of hypnotic rings--instead, his pupils were permanently dilated, reflecting his constantly aroused and eager state of mind. When he focused on the tiger in front of him, his tongue lolled out as he panted; the loose muscle swayed from side to side as his head shook in excitement, and he couldn't stop himself from joyfully barking.

"Arf arf! Awruff!"

"Aw, there's a good boy," Kassam crooned, cradling the side of the dog's face--the Border Collie fell silent and nuzzled into his palm, rubbing his face over the broad, padded surface. It was so warm, so comforting, so right--Master's hand always felt so good. He almost whined when Kassam removed his hand again, but the dog knew better; he could beg for attention with anybody else, but with the big tiger, there was no room at all for that kind of behavior; his options were complete obedience and good etiquette or harsh punishment. And the Border Collie didn't want punishment, not from Kassam.

The tiger, meanwhile, stalked around the fuck bench again and, after watching the horse dildo rapidly plunge in and out of the dog's hole for another mesmerizing minute, forced himself to finally turn off the fuck machine. The flywheel slowed and the thick dildo gradually came to a stop, resting halfway out of the dog's ass with his lips pulled along the silicone length. Even though he was desperate for more rough fucking, the Border Collie stayed quiet and still while Kassam pushed back the fuck machine, which, in turn, drew the dildo further out of the dog's ass. The inches of silicone dragged out until the broad, flared head bulged past the last swollen sphincter and wetly slopped out of the destroyed hole. The dildo was so heavy that it drooped and rubbed along the rubberized floor--leaving behind a thick snail trail of lube and mucus--as Kassam pulled the machine further back to give himself room to work.

With the fuck machine and attached dildo out of the way, Kassam began loosening the straps on the Border Collie's limbs and torso; the dog gingerly moved his arms and legs as Kassam released them. His muscles ached from being locked in one position for so long, but he would have happily spent another 36 hours on the bench if Master told him to. The canine waited patiently while Kassam released the last straps and then unclipped his tail from the restraining cable that was still attached to his collar. His tail free at last, the Border Collie waved the bushy plume of black and white fur like a flag, showing off how eager he was to please his master. Kassam chuckled at the display while he removed the cable from the canine's collar.

"Yes, you're being a very good boy," the tiger sighed wistfully, discarding the cable to the side. He twisted out the clear tube connecting the dog's urethral plug to the gas mask, letting piss dribble freely from the lime green, hollow sounding rod to the floor again. Kassam then patted the dog's back and continued, "Alright, pup, up on the table, it's inspection time."

The Border Collie excitedly yipped and pushed himself off the fuck bench--his legs still sore, he toddled obediently over to the large work table and hopped up onto the metal surface, where he sat on his hands and knees at attention. Kassam followed the dog to the table, where he ran a firm hand over the Border Collie's sides, feeling his chest and stomach expand and contract with his breathing. Satisfied, Kassam then looked lower and let his hand trail downward into the dog's crotch--the canine's tail thumped against the table even though he sat still, eyes forward, while Kassam gripped the base of his erect cock with one hand and pinched his glans and frenulum with the other hand. Kassam could feel the stiff resistance of the silicone sounding rod still in the dog's cock--he rolled the cockhead between his fingers experimentally, eliciting a soft whine from the canine.

Kassam laughed at the dog's reaction, then said, "Alright, pup, here comes something fun." Without waiting for the canine to ready himself, Kassam gripped the exposed tip of the hollow sounding rod and yanked hard, as if he was pulling the release cord on a parachute.

"Awroooooo!" the Border Collie howled in ecstasy as Kassam ripped the thick, slime-coated, lime green tube out of his urethra, a faint blub-lub-lub-lub-lub sounding as the tubes ribs rubbed against his urethral sphincters. The Border Collie could feel the tugging all the way from his bladder, through his prostate, and into his erection; all 15 inches of the flexible sounding rod exploded out of his cock in mere seconds, followed by a thick stream of warm piss. The Border Collie tried to clench his muscles, but he couldn't control his bladder, the opening was just too loose, and he emptied himself completely on the work table, the puddle spreading between his knees.

"Good boy, very good boy," Kassam growled before he raised the slimy sounding rod in his hand to his mouth. He slurped up the silicone length like a noodle and rolled it around with his tongue--he could still feel the residual heat off of the silicone from being in the Border Collie's body for so long, and the musky, salty flavors he tasted were so divine. Kassam suckled on the rod for a moment until the Border Collie's flow of piss finally abated, and he spat out the sounding rod, letting it drop to the floor. His right hand still around the base of the dog's dick, Kassam raised his left hand to his cockhead again and pressed a finger against the Border Collie's urethra.

This time, the digit slipped in easily, as if the urethra was greedily sucking it in. Kassam pushed in, past his first knuckle, then his second, all the way to the base of his finger. The canine moaned low while Kassam fingered his urethra, wriggling the digit inside his cock like a worm. Kassam rubbed his finger pad against the smooth, slick inner lining of the canine's cock, pulsing his digit within the warm shaft that throbbed around his finger. The Border Collie panted lustfully, and Kassam, grinning at the dog's obvious desire for more, extended his claw, lightly scratching against his urethra. The dog shivered in response, relishing how Master violated his most intimate space--but then, for him, there was no such thing as intimate space. Every inch of him, inside and out, was at the disposal of others. He was nothing more than a toy to play with, and the Border Collie was so grateful for his purpose.

Eventually Kassam pulled out of the dog's cock, leaving the gaping urethra alone while he moved his hands lower and firmly cupped the canine's balls that rested heavily on the steel tabletop. Kassam lifted the nuts in his hand, feeling how much heavier and more swollen they had become due to overproducing sperm. The tiger didn't even need to check the dog's taint to know how engorged his prostate now was--his balls were a good indicator that the gland, once the size of a ping-pong ball, would now be the size of a grapefruit, with seminal fluid production kicked into overdrive. Satisfied, the tiger patted the Border Collie's leg.

"Alright boy, looking good so far. On your back now, and legs up."

The canine quickly complied, rolling over on his side, then onto his back while he held his legs up high, his feet over his head with no effort at all. The Border Collie looked doofily up at Kassam between his legs, clearly so happy to be performing these small tasks for his master. As focused on his work as he was, part of Kassam's heart simply melted when the Border Collie looked up at him; his cute little face, with those lively, bright teal eyes and mischievous-yet-eager smile, and his fur that was just delightfully messy--it was all was too endearing, and Kassam couldn't stop himself.

"Urgh, you're just too fuckin' adorable!" the tiger growled before he attacked.

Kassam happily rubbed the dog's sides and belly, lightly scratching through the fur and sliding him around on the table and through his own puddle of piss, all while cooing, "Who's a good boy, who's a good boy? Is it you? Are you that good boy?"

The Border Collie wagged and panted and gleefully nipped at the air, grunting and sneezing happily while his tail thumped on the table. "Arf! Arf!"

Kassam scratched and tickled everywhere he could reach--the big cat was just overwhelmed with how cute the little dog was, and he lost himself to his instincts for a minute. He drummed on the dog's belly, rubbed his throat, played with his mouth and tongue, scratched his ears, and tousled every inch of fur he could get his hands on. Kassam settled down eventually, slowing his scratches and rubs before he patted the dog's sides for a final time--the Border Collie panted and simmered down with his squirming while the tiger took up, "Okay, okay...let's have a good look down here..."

The dog contentedly huffed while Kassam's attention drifted lower to his exposed rear entrance. Just above the gaping hole that hung loosely open--the lips drooping downward under their own swollen weight--Kassam could see that he had been wrong about the size of the Border Collie's prostate. Instead, he could see that it had swollen to the size of a pomelo; Kassam realized that the dog's system must have been especially sensitive and receptive to the chemicals he'd injected into it, meaning he'd produce even larger quantities of cum than he'd estimated.

Snickering to himself, Kassam took a closer look at his primary target--the Border Collie's rear entrance, rimmed by a bloated ring of limp muscle, was nowhere near closed, and the tiger could see deep into the dog's cavernous, cherry-red rectum. The tiger batted at the hole with his hands, alternating swats and smacks to rile up the dog, who squirmed excitedly and wriggled on the table to try moving closer to Kassam to get more of the good stuff.

The tiger gradually extended his fingers as he worked, hooking his fingertips just inside the overstretched ring and pulling at the rim from the inside like it was a thick strand of tough taffy. Every tug made the dog's hole ever more ravenous, and Kassam could feel him actively pushing to open himself wider, subtly inviting the tiger deeper inside, while his cock bobbed back and forth. The tiger took a special perverted pleasure in knowing that he was the reason that dick--with its yawning urethra--would never be flaccid again.

Soon Kassam slowed and stopped his treatment--that was just the preamble to the main event. With the Border Collie still lying on his back on the table, panting hungrily, Kassam took his time to open one of the work table drawers. He pulled out a large bottle of lube, which he applied liberally to both hands and forearms, greasing up his fur with a clear coat of viscous fluid. When he was done, he bent forward slightly for a better angle and reached forward with his right hand toward the gaping, quivering orifice in front of him.

The Border Collie shivered as Kassam's slick fingers danced across the distended and bruised rim of his hole; the tiger expertly pulled at the lips of his anus, making room for all four fingers and thumb to enter, and the dog grunted when Kassam's textured, lubed pads glided against the slippery surface of his swollen, fleshy tunnel. He did his best to hold himself open as wide as possible, and Kassam growled in satisfaction while he inserted his palm.

The Border Collie yipped while his master rubbed against his prostate, and Kassam smirked when he felt his hand roll over the dense, enlarged gland. He pressed down hard on it, curling his fingers over the enormous lump before releasing again and Kassam easily slid his wrist and forearm inside. The dog's tongue lolled out in pure, lazy contentment while his master fondled and filled his guts in just the way he had been longing for. Lube and mucus dripped from the dog's inner walls onto Kassam's furred hand and forearm, and the canine closed his eyes, leaned back, and whined in pleasure at his master's invasion.

"Good puppy, you're taking it like a champ," Kassam encouraged. He pushed farther, sliding into the dog like he was donning a thick, slimy glove that was writhing euphorically around his forearm. The tiger easily sank in up to his elbow and kept going, encountering no real resistance at all--there was practically no elasticity left in the dog's warm insides.

The Border Collie's tail thumped hard at his master's praise. He was so happy to be filled like this. He was just a hole, after all. Just a dumb dog with a big, juicy hole that needed to have a cock, a tongue, a finger, a fist, a dildo, a fucking broom handle--anything at all--inside it. His mouth and dick were both feeling so empty and so hungry now, both in desperate need of something filling them. But the gratifying feeling of having his ass played with like this was just enough to make up for the lack of having objects in his other orifices. Then again, if a dick, foot, or hand presented itself in front of his muzzle, of course he would immediately lick and suck on it--he was just a dog, after all.

When Kassam got halfway up his bicep into the dog's hole, he flexed hard--the Border Collie's loose rim instantly tightened around the hard band of muscle, and the dog yelped ecstatically.

"Is that good for you, puppy?" Kassam asked, holding his flexed python of a bicep steady.

"Arf! Awruff!"

"And how about this, boy?" Deep inside the Border Collie's guts, Kassam curled his fingers, scraping them against the rubbery, slippery walls to form a massive fist.

"Aaarrrrrrrrruuuuuuuuu..." the dog huffed and groaned.

"But I bet it's not as good as"--Kassam surged forward with a grunt, popping the rest of his enormous, flexed bicep past the Border Collie's rim and sinking his fist past another set of sphincters--"this, huh?" he finished over the dog's howl that filled the dungeon.

The dog panted hard, the hormones flooding his brain and making him beg for even more. Now buried up to his shoulder in the quivering hole that hungrily clenched around his arm, Kassam began rocking back and forth, slowly at first. His fist bluntly withdrew from and penetrated the loose rings of muscle inside the Border Collie, eliciting grunts and groans on every subtle thrust, and Kassam smiled in delight at the puffy lips that were drawn out and pushed back in around his shoulder and bicep.

The dog felt sheer bliss. The girth that stretched him, the length that filled him, the fact that he was so utterly at the control of the big tiger, the joy of hugging his master's arm with his insides--it was all just so sweet. If he had any control over cumming, he would have been coating himself from head to foot in his own sticky seed. Every bump and grind of his master's arm against his swollen prostate was enough to make him see small stars and feel like he was going to blow a load. Pre dripped from his wide open urethra and streamed down his slick shaft, matting the fur around the base of his cock. His balls felt like they were going to explode, and all he wanted was more.

Sweat formed on Kassam's brow as he labored; over the time he spent working over the dog's hole--rolling his fist around and flexing his arm muscles--he began sped up the rate of his thrusts, turning them into rapid-fire punches in the Border Collie's guts. Soon he began drawing back farther and punching back in, leaving the dog's battered and abused insides empty for only a second before slipping back inside. The sounds of dog's grunts mixed with Kassams and the wet glk-glk-glks of his hole being abused filled the dungeon.

"Unh, unh, unh," Kassam breathed. Punch, punch, punch--the dog was getting looser and looser with every jab, pushing more of himself out to be punched and stuffed back inside by the tiger.

Kassam relished the feeling of pronounced wrinkles of flesh squishing against his fingers. He modified his punches as time went on, varying when he rolled his knuckles hard against the dog's guts and when he stretched his fingers to prod and pull at the pliable muscles. He kept up the rhythm for as long as he could until his arm began to tire.

Shloooorp--Kassam, with a mighty grunt, withdrew completely, pulling his slimy right hand out of the dog's slick hole before immediately and bluntly shoving his left arm up to the shoulder back inside the hot tunnel of muscle.

"Guuuh--wruff!" the dog huffed and yelped at the sudden emptiness and abrupt refill.

Kassam punched hard, thrusting quickly with his left arm and grabbing onto the folds of muscle that surrounded his hand every chance he got, stretching the dog's insides as if he were kneading sloppy pizza dough with both expert precision and wild abandon. He could only imagine how open the dog must feel right now, how delectably full he was, and how he must be starving for more. Kassam's cock--hard the whole time he'd been stuffing his fists into the canine--throbbed as he imagined how many people would be lining up on the stage at Hightower just to fist the new bar dog, and the slutty canine would be begging for so much more than that. He was an insatiable cockhound, and would be for the rest of his days.

"Ugh...fuuuuck," Kassam eventually groaned, starting to feel the strain in his left arm. He pulled out until only his hand remained inside the Border Collie's lubed, greasy hole...and then he lined up his right hand with his left wrist and slowly pushed forward until he could clasp his hands together in the dog's guts.

"Awrooooooo!" the canine howled again as the two fists--fingers interlocked to now form one large ball--sank deeper and deeper into him, while Kassam spread his arms apart, wedging the dog's hole open with his thick forearms. The loose pucker stretched around his limbs, flexing as he worked.

"Yeah, there's that pup hole, so fucking hot," Kassam muttered, drawing his fist back and pushing them forward again. His fingers slid greasily against each other and the ribbed inner lining of the dog's intestines, stimulating the pup's nerves even more than before.

The Border Collie's eyes rolled back in his head for a moment, he almost couldn't process the sensations he was feeling, and he just wanted them to keep going. His entire body was at his master's disposal, and he was so happy that his master took pleasure in opening him up like this, bluntly pulling out more and more loose rings of his muscle, and sliding his thick arms in and out past his abused and doughy hole.

Kassam got up past his elbows and held his position there for a moment, catching his breath--he didn't know how much time had passed, and by that point, he didn't care. He had lost himself in the joy of splitting open the dog, the dog who needed to be prepared for all the terrible and wonderful things everyone at Hightower was going to do to him. All this hard labor and training was for the Border Collie's own good--Kassam couldn't help it that he enjoyed the work at the same time.

The tiger looked the dog in the eye again, and chuckled when he saw that the Border Collie was just as enthusiastic and enticing as he'd ever been. It was as if he hadn't been fisted at all and was begging for the first round.

"Ah, you're gonna be a good pup at the bar," Kassam panted proudly.

"Arf arf!"

The tiger shook his head to himself, then groaned as he drew his fists back until the loose rim of canine flesh encircled his wrists. Kassam unclasped his fists and said, "Alright, boy, ready to do a trick for me?"

The canine barked happily.

Kassam lined up his hands back to back, then drew them back and out. At the same time, he curled his fingers around the inside of the Border Collie's anus, prying apart the hole as wide as he could to reveal the dark, expansive tunnel.

"Present for me," he instructed.

The Border Collie immediately began clenching and pushing, bearing down on his insides. He grunted with the strain, then panted as a thick, large prolapse formed, blossoming silkily out of his hole like an enormous rosebud dripping with lube and mucus. The folds of red and purple muscle shined brightly under the dungeon lights, and they piled and swirled on top of each other, contributing further to the flower blossom look.

"Oooh, fuck, that's beautiful," Kassam murmured, entranced.

He leaned down and opened his mouth, lapping over the prolapse and suckling on the tender, exposed flesh. The Border Collie whined and moaned at the feeling of his insides being violated like this, enjoying every second of it. Kassam growled and bit down, his jaws worrying the muscle back and forth as he nibbled. The Border Collie huffed as he felt the tiger's sharp teeth raking across his delicate innards. All he could do was lie back and enjoy while Kassam kept eating; the large tiger sucked hard, wrapping his lips around as much of the prolapse as he could get, his tongue soaking in the musky flavors of the canine's insides.

As Kassam lapped the prolapse--squeezing it between his tongue and the roof of his mouth, chewing on it, and swirling his tongue into every crease he could feel out--he silently mused to himself that this was the last time the dog's guts would be so clean. The next time the Border Collie would present like this, nearly every inch of his insides would be painted with so many loads, there'd be more white than red.

Kassam could just imagine some big leather-clad bear at Hightower shoving a submissive boy's face into the Border Collie's messy prolapse, smothering him in the sloppy leftovers from who knew how many others had coated the dog's bowels. And then the daddy bear would let his boy free at last, letting him gasp for air while the Border Collie would eagerly lick his face clean. The tiger's cock throbbed hard at that mental picture--like a predator digging into a fresh kill, Kassam growled intensely into the dog's prolapse while still roughly lapping and suckling on it, making the canine shiver with delight.

Kassam eventually leaned back from the prolapse and let it loudly pop out from his mouth. "That's the good stuff," he chuffed in a daze, licking his lips. He rumbled to himself before he addressed the dog again. "Tuck back in, boy."

The Border Collie obediently relaxed, and the prolapse sank back inside, inverting into a wet, wrinkled tunnel to fill. Kassam studied the sight for a moment longer before he took up, "With a hole like that, you must really be starving for cock and cum. Don't you worry, puppy. I've got just the right couple of friends who can help out."