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The wheeze echoed through the lab. No different from those of machines pumping and working, distillating and refining potent chemicals. From solvents to acids, from bases to reactants. All had been automated following the process he had learned from his years in Humbert Labs.

Those years had been formative, rich in hopes… As well as deceptions.

The wheezing continued from the mask, keeping Alexander breathing despite the noxious fumes in that part of the laboratory. Airing them out could have been an option, if not for the proximity of civilians that would alert authorities. If not for the latter, the former would have been of little consequence.

The breathing mask wheezed again as he passed the airlock and the decontamination chamber.

Today's work had been expediently handled, with a slight peak of productivity early in the morning when he had another epiphany.

However… This had been a fleeting moment, clarity in his purpose as reworking the Nox gas was a peculiar and taxing endeavor: the gas was not only toxic but also had corrosive properties that had to be negated. In contrast, the toxicity had to be adjusted to target a large range of organisms except one category.

Hindered as his pace was, there was still a chance for Alexander to produce results before time would be cut short.

The wheeze stopped once he removed the gas mask over his face, peeling off the goggles protecting his eyes until his features was revealed. Green eyes, fair skin peppered with freckles over his cheeks, a distinctive frown amplified by his hirsute beard and his sleek hair.

He was not thin by any means, but his traits were sunken by age and illness. To the point he was seeing white streaks in his brown hair.

He frowned as he passed a hand over his throat, feeling sore.

BARK!

The sound hailed from afar, further down the bunker repurposed as a laboratory and living apartment.

Already, the hoary scientist's face beamed with interest as he threw the mask and goggles aside. He then walked toward the source of that sound, undoing the strap of his suit enough to reveal the red leather collar around his neck.

His steps went further as the barks became distinct, and his boots pushed through the long corridor leading to the different rooms inside the bunker: kitchen, bathroom, bedroom…

Finally, up to the living room with the distant sounds of laughs and the television.

The sound was so eerie, distant.

And so was the voice that followed: “You are late. There was another epiphany?"

It was an artificial voice, grating to hear. Especially with the distinctive accusative tone modulated by the machine's slow articulation.

“I lost track of time, but I think I'm nearing a breakthrough. Didn't you say you abhorred our television?" answered Nox, the front of his suit opening on a black shirt and red underwear, both covered with sweat after he had been working all day. He slowly peeled everything off, gloves and boots first, before removing the sleeves.

“I do. But I have to occupy myself, lest I am bored," answered the artificial voice, a beeping noise following and indicating its owner took a pause in their rumination. “I prepared your doses for tonight."

Sleeveless and with his body exposed, anyone could see Alexander had been a strapping man. But now seemed different: his shirt hardly held onto his chest, and his lower belly peeked from below, showing a bit of its hairy presence and stretching marks.

Instead, his green eyes focused on the four pills displayed on the coffee table. He raised an eyebrow but still fetched them to swallow them whole.

“Doubling the dosage? This is ill-advised," he commented while using saliva to force everything down his esophagus. He then returned to his stripping, removing the pants, and finally standing in the living room with nothing to cover his hairy legs or his arms. But this was only the beginning.

“It is. But we are beyond those mere considerations, yes? Don't forget to be on your knees," continued the voice with a sound of disdain unfitting from an artificial voice.

Alexander Nox breathed and undid his shirt without glancing at his changed body nor his genitals when he was entirely stripped in the living room and went on all fours.

The concrete felt cold against his knees and hands but bearable as he crawled toward the unique couch in the living.

Onto which was sitting a dog. A German Shepard, lying on his side. However, his golden eyes were brimming with cunning, with a cold apathy, with… A sort of understanding between both, from a clever mind to another.

The Shepard's coat was short, black and tan: the hind and forepaws were tan, with the color spreading over the Dog's side, chest, and head. While the dark fur was over his eyes, around his ears, and covered his spine as if draped in a cloth.

Around the powerful neck was a collar, red and leathery, with multiple boxes attached and joined together by circuity and cables.

The whole apparel sprung to life when the Dog's ears lifted and his muzzle extended.

“Good bitch," spoke the Dog. Titan. His demeanor was calm and collected but deprecating.

Disdainful of Alexander, who stood by the couch and extended his head to invite the Dog to a kiss.

It was pure perversion, yet the German Shepherd's wide tongue pushed within the confine of the Scientist's mouth. Slobber dripped all over Caustic's lips and over his beard.

In this parody of a french kiss, he was at the receiving end and had no word to oppose as he stroked the left side of the Canine's head, then his neck while he enjoyed the moment.

Months ago… He wouldn't have done this.

More than that, he would have considered Titan to be a mere dumb mutt, a burden in his perfectly ordained life. In the morning, he had to start with a pot of coffee before heading out to the lab for daily research up until noon. He used to take a break, cook, then eat something. He would next return to the laboratory or instead go outside to search for test subjects: drug addicts or mendicants were perfect for this.

It was only through a fellow researcher's intervention his life was changed: he was prompted to handle Titan for a short period as a favor from his owner. A just return after the man had procured Alexander with rare reactants from Gaea.

The Dog, way bigger than his appearance and breed would hint at, proved to be inquisitive and rather clever. Somehow, it was near impossible to lock Titan within one room inside the bunker or to keep the Canine from examining every piece of tech lying around.

During a moment, Alexander Nox had even imagined the possibility of losing touch with reality when his computer noted logging periods while he was in his laboratory.

However… Well, he would come to learn it was different when one fateful night, as he was reclining over a chair, Titan approached him.

The Dog had been acting rather tame that day, and Nox had taken half the day off to relax and read about peer studies, with the bare minimum on him.

Titan had then approached him and, without any warning, had jumped on Alexander. For a moment, he had thought about fighting back… Only for that Canine to kiss him. Something so absurd and yet proven as, with many muffled whines, he glanced down to see the Dog's cock peek from between his legs.

A pink, girthy dick with a bulbous knot and veins all over the length. Something that was… Almost as big as his arm. And yet, despite the fight, the creature seemed hellbent on forcing its way down Alexander's mouth and choking him with it until he was out of breath and despondent.

It did so until he had been lying on his chair, too weak to fight back. And there, the creature climbed on him in a precarious equilibrium that ended up toppling the chair… In a thunderous sound, both had fallen, but Caustic was then forced to face Titan's genitals. His testicles, his bulbous cock, the spaded tip. He had thought he could merely watch it… But no, not when that tip prodded his lips, not when the precum smeared and stuck to his nose.

And the stench… The stench, he remembered how he nearly gagged the first time. Only to have his lips invaded by that long massive Dog's dick, too big to bite back.

For what felt like hours, choking and gagging, the Dog mounted his mouth and forced its way down his throat until he unleashed himself.

The moment when Nox had returned to his senses, it was to witness that dog sitting on the couch without any care for the old scientist: cum covered, with the salty and sour taste of semen in his mouth, followed by a coughing fit and some more.

The hand over his mouth, Nox thought about killing that creature for forcing his way on him… But he didn't. He couldn't tell. He wouldn't ever be able to tell. But he relinquished and left.

This… This continued, however. Days after days, until Nox feared the return to his quarters until he trembled when he passed the threshold. Until… He salivated at the thought of it. It was an eerie situation, where even his cold clinical mind could not tell the reason for this.

But the french kisses, the facefucking, and more, they returned.

Each time more intense, each time more devious.

And more welcomed.

The lips no longer had to be forced by the kiss, by the tip, by the knot. The mouth had grown used as well as the throat and lungs, right before the beast decided to move on and forth. The clothes had been stripped, that asshole licked the same way then mounted.

But the routine had been going until the afternoons were passed in the bliss of a strange lover's embrace who wouldn't leave, even if asked or begged. He would spend hours on his back or four, enduring the thrusts and growls.

The routine kept going, up to… The collar.

Alexander stroked it, felt the metal weight on the Canine's neck as well as the hum from the machine analyzing the thoughts to transcribe them. A contraption, crude but efficient. One he had grown to welcome.

One he stroked as Titan's tongue plunged within his mouth and filled it with saliva.

Until their kiss broke, and slobber fell onto the human's beard as his hand kept stroking his lover.

“Bitch. What are you thinking about?" asked the Canine, his ears lifting.

“Nothing of importance, intrusive reminiscences," completed Alexander, waving his hand while some of his own slobber added to the caked beard.

It seemed, however, the answer wasn't one Titan expected as he stretched his neck and looked left, towards the television. His collar biped, and in return, the screen shut down, leaving the room in utter silence as he came back to examine Nox.

Especially his chest.

“We will fix those worrying thoughts over time. Your body is better at adapting than your addled mind," commented the beast as he nuzzled Alexander's nipples.

Before… Before, Alexander could have been lean, fit, muscular. But not fat. That was before. Now, the skin looked taut, and his body hair bristling. His pecs had fattened until each breast had gained a certain rotundity to it that could be hardly concealed. His suits even had to be remade to accommodate his budding breasts as they were weighing and hanging now. As for his nipples, the areola had swollen and widened until the tiny nub had become two sizeable and erected teats with rings pierced through them. Golden rings from which hung trinkets: golden filigree held on by chains and depicting the shape of a paw in a paltry display of power from Titan. They had no purpose but to assert Nox's status and to cling whenever he moved with haste.

However… Titan licked them. Oh, it was enjoyable to feel the muzzle against his chest, the warm breaths onto it. And then the Canine's lips closed onto the nipples, swallowing with it: filigree, chains, nipples, flesh… All to suckle on the sweet and lukewarm milk pouring from the sizeable teats.

Nowadays, the liquid poured in large amounts, and Titan had taken a liking to giving himself a round. The Dog gulped, suckled, maintained the tight pressure around the needy flesh, whereas the human above mumbled and groaned, feeling the release of the liquid from his chest.

The pressure within was constant, and without daily milking, not only was Nox feeling bothered, but the sensitivity made even wearing the suit painful. And shameful.

Even a touch could make his nipples spurt milk, and here was Titan, drinking from the left one then the right in alternance.

“Hrmphhh, this feels wonderful," Caustic groaned, thankful for the release and satisfaction.

“This is nothing, I take care of my bitches," answered the Dog, his eyes gleaming. If he could smile willfully, he would have. But the choices of words and the relaxed body language gave away the disrespect he had for Alexander.

His gaze, however, descended onto his prized possession. Below the rotund breasts was a belly, gravid, swollen, taut, tense. The skin had stretch marks on the sides, and the belly button had popped outside. There was no denying that Nox had somehow been impregnated, and the reddish coloration of the skin indicated there was still some room to grow.

After all, Titan wanted more than a small brood from the submissive human, and if that belly hindered the research and movements, so be it. But the human wouldn't be spared from his duties and his worship. Quite the opposite.

Nonetheless, the Canine leaned and licked the skin above the belly button, stroked the flesh, and sensed the kickings inside.

“Does it hurt?" Titan asked, his voice sharing no inclination and remarks. At this, the human scoffed and shook his head.

“Spare me your pity. It does, but I can endure it. This is what matters to you," answered Nox, his voice acrid.

Admittedly, Alexander was right. In a very human way, the Dognodded, then pressed his muzzle onto the paw inked on the skin between the belly button and the human's groin.

With the pregnancy, the sign was somewhat outstretched and not as defined nor as contrasting as it was before. But it was nonetheless a paw marking Caustic's dedication to his newfound master.

Much like the caged genitals, dripping of that nauseating and human-reeking precum. Oh, it would take many piss from Titan to cover that stench. But there was no point in it since the human, as wrongly endowed as he was, would always produce it during a period of need. Like that one. It was akin to peeing himself from needs, in dribbles when he wasn't macerating in his suit.

Titan's presence produced that effect on Caustic, condemning him to shame and prostration.

The instant after, Titan's head lifted and turned towards Caustic, meeting with the green eyes. Before his ears lifted, his head tilted on one side.

“I guess it's time to add more to the litter, then," stated the artificial voice, cold and calloused, while its owner stretched, straightened, and jumped off the sofa.

Smarter than to try to sit or take a more pleasant position, Alexander Nox leaned then went on all fours. On his hands and knees until his caged testicles hung between his legs, and he presented his curvaceous ass to the dog.

The hole dripped, naturally gaped by its training. The glands inside worked tirelessly to keep the orifice moist and ready, unleashing its musky perfume that had changed and lessened over time. One that remained when the Canine's cold nose pushed against the rim and forced it apart by its presence. Cold, so cold it made the scientist almost gasp and heave from the sensation.

He huffed when the Dog's warm tongue slipped all over his scrotum, the ring holding his chastity cage, the perineum… All leading to that ass once the nose departed from. Next, Titan began to lick and properly taste that sweaty and sweet rim.

“You are always so eager and ready for me," spoke the artificial voice while another lick slightly pressed on the swollen muscles, tugging it higher and prying the hole open for half a second.

“Thank- Thank you," answered Caustic, unable to answer anything else. That was a praise; at least he could accept it without wounding his ego too much. Not that he had much to spare.

Not when his ruined ass was lapped by a Dog, the large appendage playing and circling the hairy crack while collecting the sweat attached to those hairs. Then… Forced. And plunged.

“Are you satisfied, Caustic? From this foreplay? From a Dog you despised?" stated the voice, calm. But the speed and the choice of voice suppurated such a disdain, a hatred.

The scientist nodded, his voice a grumble as he felt the tongue push through the first centimeters in his ass, forcing through the sphincters without much resistance.

“I am," he answered succinctly.

However, his face said something else. Titan couldn't see it now, but both knew. Both had seen it before; both had witnessed it: Caustic falling cheekbones and brows, his lips half-opened, his saliva dripping, his lungs filling and emptying in shallow breaths.

He trembled, clawing the concrete while his torso and head lowered and his ass was lifted in comparison. He could grit his teeth, but it would make the expirations ache and torment his ill body. Strangely, under Titan's guidance, he felt better, his breathing improving by the day.

But even then… He wasn't looking for a coughing fit, not with that Canine's tongue inside him.

If he did, his ass would clench, and he would experience the licking, the saliva, the wetness tenfold while his ass cheeks and orifice closed.

So he exhaled, letting out a sigh with his eyes half-closed. He tried not to overthink the moment, nor the… sheer stimulation of having that appendage playfully tease his prostate. It had swollen, become more sensitive and prompt to outbursts. Such as the one he felt, a tense prickling from his ass to the front of his groin, one that seemed to extend to his bladder but without… Hurting. Not really.

“Hrmphh, I- I am sensitive today," he mumbled, excusing himself for that outburst in front of the Canine.

“Please, Alexander. There is no need for you to hide your vulnerability to me. I am your confidant, your friend, your master," answered the voice with a tempo betraying the excitation the Dog felt.

And his musk, Titan's musk, was stronger today. Perhaps he, too, was feeling excited and overly sensitive today.

“I-… I agree," he mumbled back, reinforcing his grip on the grasps and strands of the carpet. The tongue inside him now circled and danced, rolled and contracted until one subsiding movement preceded a thrust and a moan.

“Of course you agree. You know your situation. You are a mongrel, a lowly beast whose achievements were his birthright. Pathetic, callous, unfeeling, uncaring. In your society, you are an anomaly."

Titan's scolding was harsh, brutal. None that Caustic would have cared if it came from someone else. But from that artificial voice, from that collar he had bought and modified to fit Titan's body, that was… Humiliating. Akin to be judged by your creation, your own doing.

But Titan was not his creation. And the Dog did not care about what kind of feelings Alexander could experience. Anger? Fear? Frustration? Envy? It didn't matter.

It never mattered when the Dog's mouth departed from that juicy ass, linked to it by a trail of saliva that was cut once its paws moved and climbed onto the human's plump backside, its claws scratching the scars-marred skin.

“You do not care about the others sentiments and emotions. Your sole interest is what you give value. Perhaps work, perhaps your accomplishments, perhaps the deaths you've dealt," continued the rebuke.

Beneath, Caustic felt the weight of the massive Dog on his back and adjusted his hands, lifting his upper body until those paws were onto his shoulders or near his knees. However, what he experienced was that warm and pointy end stroking his hairy cheeks, brushing them and poking the skin.

“What is the meaning of this?" asked Caustic, indulging in Titan's musings for once. The Dog had grown smarter, more delicate, more acute in his usage of the language. He had always been intelligent. But those words, they hailed from an analytical mind, rational even. Talented, even?

“I am giving you my reasoning why… Why it is better for everyone and the whole world if you remain here in that bunker, hunkered down while you provide and bear my pups. You may have imagined it was of pure lust from me when I assaulted you the first time."

Nox's head lowered.

Yes, he had thought the Beast to be wrong, easily excited. Even now, a part of him could still reason the way the beast mounted him originated from mating instincts. And so was the feeling of that red shaft positioning and nestling between his asscheeks. Its length was quivering, certainly coated with fluids whose perfume hung heavy in the room.

And it forced onward, spearheading the swollen gaped rim.

Titan was girthy, so much… So much so Caustic felt his jaw tremble, and so were his legs. So was his quivering breath. His heart palpitated, at the verge of exploding within his thoracic cage, while the Canine pressed on with his paws digging within the man's hairy shoulders.

And there, with his head so close, the collar spoke right into the scientist's ears, whispering those sweet treats and abuse.

“I am rectifying your attitude towards order. You never had any alpha to force you to bow down, or never were given any punishment for the grievances you inflicted," continued the voice with a tone… Yes, it sounded like anger.

Perhaps it was due to the heat permeating Caustic's body or his breathing being so short, but he could swear he heard that tone while the beast mounted him and forced that cock further inside. But only a quarter was in, and not the full girth, barely a fraction of it as Alexander remembered the knot… Imagined it.

And dripped with precum on the concrete.

“I take care of my bitches, I say. But never will I let them keep a deleterious comportment, especially in the presence of my pups. I will… Train you. Even if by the end of it, nothing remains."

Caustic shivered. It was cold, calculating, pragmatic, justifiable. It was logical for Titan to oppose his point of view… And in this situation, bowing down and legs spread, Caustic was in no position to refute the argument. He was at his wits' end, his body ached and ached from the needs and the pregnancy. It ached from and for Titan's presence. It ached until he would wake up delirious, only to be taken anew by the Canine's shaft.

One… One he felt as he clenched his thighs and reinforced the pressure from the asscheeks onto it. Titan was taking his time inserting himself within, his hips rotating while the Dog's back slowly arched. And so was Caustic's, as inches by inches progressed within his orifice and nudged his prostate.

He was dripping, reflecting the perception of his caged and strained dick. But he was feeling it, the etched sensation of pleasure and the arising potency… That orgiastic satisfaction that threatened to take his mind ceaselessly. One elicited by that dog's weight, his dick now at two-thirds inside, by that heaving breath by his ear.

Then, the progression halted. Stopped while the Canine's muzzle rubbed against the human's face. It nudged Alexander… Egged him on to turn his head. And when he did, that tongue lapped all over his face… Then stroked his lips.

He opened them, allowing the broad tip within, and suckled on it.

“Do not worry. Once your testosterone levels have been lowered and your gonads adjusted, your conditioning will become easier for you and me."

Behind… That girth had progressed so much that it stretched Alexander's rim thin. But against it pressed a wall, something whose sheer width threatened mind and body, consciousness and fortitude.

“A bad bitch rebels less than a bad human, that is certain."

“P- Mhh- pleshe," mumbled Caustic through the mouthful. Then, his mouth was liberated.

“Speak your mind," answered the Canine, his hips still gyrating and rocking the human's backside, hitting and smacking with those enormous testicles filled with dog semen.

“Please… Knot me."

“Hmph. Of course, I will. I don't want any pretender to have a chance with your womb, human," spat back the Dogwith all his frustration.

Perhaps Titan was too possessive, but Caustic couldn't care for it at all when he felt the strength applied by the paws on his shoulders, the restriction as the nails dug into his skin and drew lines on it.

Above that, the Dog's jolting hips moved faster, hitting and hammering the human's cheeks while the red cock plunged inside only to pull back, a back and forth that was oddly human… Oddly pleasing for the Scientist for couldn't keep his countenance.

His eyelids fluttered, his mouth opened wide, his swaying tits even dribbled with milk on the concrete… He- He was about to fall, to reach that apotheosis and… His cocklet burned with desires. Increasing whenever that dick hit his asshole… No, his cunt.

He cried out: “I'm- about to- HRMPH!"

He cried and was silenced.

Once more was the Dog's broad tongue inside him, gagging, filling his mouth and the back of it, even thrusting lower. Titan didn't kiss him, he choked him. He choked him from the inside by passing through the uvula and pilling the appendage in.

It was terrible, it was wondrous. Nox gurgled, gargled, his throat contracted as his chest was taken by spasms. His lungs had been emptied, and the little air inside wasn't enough… Wasn't enough as the old man was in apnea and without any breath left.

All the while, Titan kept going, kept coming, kept hammering his dick against the swollen rim and hole. His knot was there, filled and bloated, so hard it pummeled and felt like a fist against the human's ruined orifice.

“Take it, bitch! Take it!" roared the artificial voice, its words sped up to expose the Dog's anger as the humping became rabid.

The nails dug, the hips gyrated, the Canine bounced on the human's back.

The choked human, the slutty human, the whorish human who felt his thoughts grow sluggish, his locked arms and legs weak. Oh, folly that was. Oh, folly he gave in, his green eyes rolling in their sockets as saliva dribbled onto his beard and caked it.

And… He came. He came in a single shot of cum, one straight line on the carpet followed by dribbles coming from the tiny orifice in the cage.

He came…

And the knot wasn't there. Not yet, not now, not at that instant.

Not until Titan desired it, not until that Canine reached his orgasm. But it was almost there, ceaselessly pushed and rebuked, denied as the moment was too perfect, too delicious.

Beneath, the human tight hole had clenched and closed onto the canine shaft, encircling it and squeezing it as the poor human lost control of his muscles.

Caustic had ejaculated first, without the knot.

A chuckle came from the artificial voice, like a defiant mockery towards the poor human whose eyelids were half-closed and his arms trembling.

There… Titan removed his tongue, giving freedom and air to that worthless human. Alexander gasped with a breathing so raspy it sounded like metal.

The instant after, all that good air rushed out of his lungs when… Here it was.

The knot, the bulbous base of that shaft, the sheer limit in size and width Titan could offer. A monster of flesh that had wedged itself in, forced the sphincter to gape in a wrenching pain before it closed on that swollen spot that wouldn't budge without time or cries.

Titan was inside, and panted, his muzzle wide open. Drool dripped from it, from his tongue he passed over the human's face. Titan didn't want his bitch to lose consciousness.

Not at that moment of sheer perfection. He weakly humped that ass, but the deed was already undergone, ongoing. His scrotum had clenched, his prostate had done so… And both could feel the flood and flurry of semen invading the human's tight innards.

A white, burning, cleansing, perfect flood that would rapt everything the human had… Piling up to the other woes and weight the bitch bore each day and night.

But that was for her own good.

“Satisfied?" asked Titan, the artificial voice resonating amidst the gasps and groans.

Caustic could hardly answer to that. His guts pressed against his lungs and skin. The latter was taut, too taut, more stretch marks would come soon.

Worse was the kicking and movement in what was that artificial womb… He felt the tremors and movements while semen had pushed where it shouldn't have and filled places that had never been filled.

He groaned, his elbows trembling, his eyes veiled by tears.

His analytical mind knew this was a sign of weakness, he was nothing but a failure at this moment. He should plot, prepare, try to take control. He had a pride, a status, a purpose.

But he was overtaken by the tears, by the hormones rushing through his body… By the joy.

He was a bitch. He was Titan's bitch. A mere Dog lover. And he was pregnant. His lover had rewarded him with another litter of pups.

“I love you, Master," he shouted as tears rolled over his cheeks before his master's tongue approached to silence him.