Chapter 6: Break-in period

_ Author's note : This story features characters introduced in Chapters 5 and 2, so consider reading those first._

I was settling into my new life as an obedient workout dog. But on the fifth day, an unmarked white van pulled up in front of the house. Three men wearing white lab coats got out and walked up to my door. I was in the living room doing pushups, so I was initially startled when they opened the front door without knocking, and walked right in.

"Chance, my boy!" said a familiar voice. "It's good to see your progress in person. Very good work." Master looked my muscular body up and down appraisingly. I blushed, delighted by his approval. Then his tone turned brisk. "Alright, put some shorts on, then. It's time to go."

I dressed quickly as he commanded, and was soon in the windowless van surrounded by men in lab coats, driving... somewhere. Nobody mentioned our destination, but I didn't mind. Anyway, what curiosity I might have had was quickly quelled when we pulled to a stop inside an underground garage, barely 15 minutes later. The door slid open and I was ordered out.

I stepped down from the van and found myself before a pair of heavy steel double doors set into the wall of the garage. One of the men took me by the arm and pushed me roughly forward. The doors opened and I followed Master into a large room with tables and computers along every wall. Animals in lab coats were bustling around, looking at computer screens, typing and tapping.

I saw that there was a large red circle painted on the concrete floor in the middle of the room. I was pushed into the center of the circle and left there. More busy animals in lab coats came and left, ignoring me. I stood dumbly in the center, my mind a blank.

Master was talking to one such person, a lanky tiger also dressed in a white lab coat. The two of them spent a few minutes looking at the computer tablet he was holding, and talking quietly.

"Okay then," he said, looking up at me finally. "Let's get a baseline."

Master snapped on a pair of white rubber gloves and walked over to stand in front of me. A bemused smirk crossed his face. With a quick, business-like motion, he pulled my light workout shorts down and off, exposing my sheath. They fell in a heap around my ankles, and I was abruptly naked in the middle of the room. His paw slid between my thighs, cupping my balls.

"You'll be a good boy and do whatever I command, right Chance?" His voice was soothing.

I found myself nodding. Of course I would do anything for my handsome wolf handler. He held balls firmly, but with surprising gentleness. The feeling was much more pleasant than I expected. The sensual touch combined with the sound of his voice was quite arousing. I could feel my cock rapidly hardening.

"That's very good," he continued softly. He gave my balls a slight squeeze, which sent an electric tingle up my stiffening dick.

"Your penis is going to get very hard for me, Chance. You can get hard for me, can't you boy? That's good." His voice became more firm and commanding. My dick grew hard as a plank in a matter of seconds. "And now you're going to climax for me. You're going to cum right into my paw. Right now. That's an order."

Before I knew what was happening, I felt a strange heat building up from deep inside my lower abdomen. My rigid cock twitched and quivered involuntarily, and I could feel a strong climax suddenly building. What was happening! I had never cum just from being commanded before. And I had certainly never cum without any stroking or anything. And so quickly! But it was impossible to stop my rapidly swelling orgasm. I felt light-headed and dazed, but I stood still as best I could.

Master squeezed my balls a final time, milking the orgasm out of me. His tightening grip sent me over the edge, and I grunted as a stream of hot cum exploded out of my dick. He positioned his other paw under my cock just in time to catch it. I gasped and spasmed as I came, squirting jizz obediently into his gloved palm. Just as I had been ordered to. The feeling of release was very intense, much more than what I was used to sex feeling like. It felt fantastic to obey.

I slumped where I stood, exhausted.

Master returned to the lab bench, scraping my cooling semen into a sample tube as he walked. He dropped the sample and the gloves in a bin on the tabletop, and then turned away as if nothing had happened. He resumed conferring quietly with the tiger. Whatever was on the tablet screen interested both of them a great deal. I waited, panting, not knowing what to expect next.

After a couple minutes, my handler wolf and the technician tiger both looked up again, this time through an open door off to my right. I turned and tried to follow their gaze through to the next room, but I couldn't see what they were looking at.

"Andy, come meet our new friend."

A young black wolf entered the room through the door. His face was gentle, and he wore a neutral expression. He was naked, so I couldn't help but notice his huge, muscled arms and legs. And I noticed his huge cock, sizable even soft, dangling between his massive thighs. He looked very strong, much stronger than me despite my recent weight-lifting. Not really understanding what was happening, I just sort of stood there. The young male, whose name must have been Andy, stepped into the circle with me.

"Okay we're all set up," said the tiger technician. He tapped a few buttons on the tablet he was holding. "How do you want to run the break-in procedure?"

"Hmm... well we haven't done any conflict scenarios yet," mused Master. "Give Andy and Chance adversarial status, and assign Andy the dominance loop. Assign Chance the... well," he stopped himself with a chuckle. "It won't matter what motive Chance has, the outcome will be the same."

The tiger shrugged and tapped the tablet a few more times. Abruptly, my perception of Andy darkened. I saw now that the young wolf seemed... menacing? And he was so strong, I realized, that I probably couldn't fight him off if he attacked me--- exhausted or otherwise. It was a frightening thought. I tensed, and took a small step backwards.

Andy reacted to my movement with a sudden snarl. I saw his whole body blur into motion, coming at me faster than I'd ever seen any animal move. I tried to get away from him but he closed the distance between us impossibly quickly. I felt his paws grasp both my wrists and pull me towards him. His powerful grip was terrifying.

I braced my legs, trying to keep my balance as Andy pulled me in. He growled at my resistance, redoubling the force of his grapple. I felt all but helpless as he dragged me around. With my wrists pinned by his big paws, my arms ended up twisted behind my back. For a moment, I was locked in a fierce bear hug, his big biceps holding my smaller, tired arms tightly. My nose almost touched his. Then with a lurch he threw me down onto the floor.

Now flat on my back, with my arms pinned underneath me, I was really stuck. The full length of Andy's solid body had fallen on top of me, pinning me even harder. Panicked, I kicked my legs up to try and push him off of me, but I couldn't get any leverage. Fuck he was so heavy! My fear intensified as I struggled uselessly. I could feel Andy's dick hardening, pressing into my soft belly. He stared straight into my eyes, his face cold and impassive.

"You can break him in now, Andy," said Master from somewhere behind me.

"Yes, Father," Andy replied calmly.

He lifted his weight off of me. I tried to get free as he moved, but he was far too strong. He kept me pinned easily, with one paw planted in the center of my chest. He swung a leg over my head, and I suddenly found myself unable to see anything but his big balls dangling in my face.

Andy jabbed a thumb roughly into my mouth, levering my muzzle open. I resisted, but I couldn't stop him from prying my jaws apart. As soon as he got my mouth open he quickly stuffed his hard dick straight down my throat. I gagged and tried to spit it out. Then I tried to bite down, but his thumb was hooked into the side of my face behind my teeth, like a bridle. I couldn't stop him.

My struggling made his cock thicken even more in my muzzle, completely plugging my throat. I couldn't get any air at all. I choked and struggled even more as my panic rose. I tried kicking my legs again, but they whiffed uselessly in space above me. My arms were wedged and immovable underneath me. My lungs burned with the urgent need to breathe. My vain attempts to get free became weaker as he pinned and suffocated me. With every feeble struggle, Andy pushed further into me.

The young male wolf began to thrust his cock in and out of my throat, hard and fast. He grunted with the effort, and I gagged even more. I could barely make sense of the pain and pounding he was forcing me to take. I had no choice but to lay prone and submit to being brutally facefucked. God he was huge.

I realized, terrified, that I was close to passing out. My vision became dark, my thoughts confused. My senses fractured into abstract impressions. The violent, rhythmic thrusting I was enduring. The choking helplessness of his hard, thick shaft clogging my throat. The intense musk of his balls and sweat filling my nose. The aching burn of my pinned, useless arms. The fire in my chest as my empty lungs strained.

Andy's thrusting intensified. His knot began to swell, which he thumped roughly against my nose. I was forced to open my mouth wider to let it in, just to stop the pain of him relentlessly bludgeoning my snout with it. Immediately it popped into my muzzle like a ball gag, locking itself into my mouth. I could tell from his huffing that he was close to climax---

He thrust extra hard one last time. His swollen knot totally filled my muzzle, sealing his dick deep inside my throat. His shaft swelled, squeezing my neck from the inside like some kind of perverse medical probe. With a loud, triumphant howl, his orgasm exploded in my face. Hot cum flooded my throat and nose and mouth. I was choking, and drowning, and suffocating. I couldn't manage to swallow it all, it was just too much. Most of his seed was blown down my throat, and the rest dripped messily out of the side of my mouth.

Everything drowned in cum and confusion and black pain. Consciousness started to float away from me...

"That's enough," I heard Master say finally. He was standing over me now. He sounded pleased. "Andy, you can go back to the barracks now."

Andy immediately pulled his cum-soaked knot out of my mouth. I choked and spit and gasped for breath. He lifted his weight off me so I could move again. I rolled weakly onto my chest, freeing my arms. Andy stood up and paced out of the room without a word. I lay on my stomach in a pool of cum and sweat, panting. I was totally exhausted.

"That was very good Chance," cooed the handsome wolf as he towered over me. "You're now fully depleted and ready for your final imprint. You've earned a very special treat, you know."

I heard the sound of Master unzipping his pants, but I was too tired to react. I felt him kneel down and straddle my prostrate body, then crouch dominantly over me on all fours. His sleek thighs squeezed my rump, pressing me down gently. His strong arms entwined with mine as he lay down on top of me. The warmth of his fur felt comforting against my exhausted body. His cock, now loosed from his pants, pushed lightly underneath my tail and found my hole. My fear and pain evaporated, and I found myself getting aroused at his touch.

"Now," he said softly, "be a good boy and get ready for me." He nuzzled my headfur. His command was just a whisper in my ear, but its force was like thunder in my head. His breath felt hot against my neck. The tip of his stiffening cock probed playfully at my tight pucker.

As soon as I heard the words "get ready" I found that my arse was becoming involuntarily... slick? I remembered how strangely easy it had been for me to slide a finger into my hole, as if the anal implant had made me wet like a female. It was happening again now, but this time at my handsome handler's command. I unconsciously spread my thighs a bit more, submitting to him. The idea of having Master inside me for the first time was electrifying. I wanted so badly to offer myself to him.

The big wolf coated himself in my wetness, rubbing the length of his dick down my tight crack. I could tell that he was quite long, and at least as thick as Andy had been. But I'd barely registered the rubbing sensation before he positioned his hips above me, pressed his tip against my hole one last time, and shoved the entire length of his dick unceremoniously into my ass.

I yelped at the sharp pain as I was suddenly, roughly penetrated. He growled with satisfaction as his hips slammed into my soft rump. His girth stretched my sphincter open so wide I thought I would tear apart. The heat and pressure and pain of it was approaching unbearable... but I was determined to submit obediently, no matter what. Somehow thinking about obeying helped dispel the pain.

"Mmmhmm, that's my good boy," Master breathed in my ear. "Your ass feels very tight. That's just how I like it."

As he said those words, my whole body flushed with excitement. The pain vanished and was replaced with an intense euphoria that spread over my insides, centered on the white-hot tightness of my stretched out asshole. My exhausted muscles relaxed, giving in totally to my handler's pleasure. Hoping he would leave his mark on my limp body. I knew then that I existed only to serve him.

The big wolf began to slowly fuck me. He pulled out and slid in, pumping his hips powerfully against my ass. Once, then again, then three times. He started somewhat gently, but after a minute he picked up speed. Soon he was pounding my ass with long, hard strokes. His big cock rearranged my guts with every muscular thrust. The pounding impacts were sending blinding pulses of pleasure through me. I whimpered.

I was vaguely aware of the other animals in the lab watching us. Some walked right past my prone form on the floor, carrying tablets and equipment. Others stood watching Master rail me roughly, their eyes showing only cold detachment. Periodically they would look down to check the readouts on their computers. I could tell they were evaluating me somehow. I was being exhibited, like livestock at auction. It was humiliating. My face flushed with shame as I lay there, helplessly getting fucked.

I felt Master's knot swelling, and soon it was ramming like a jackhammer against my poor ruined rump. His heavy breathing filled my ears, grunting and huffing rhythmically in time with his strokes. His forepaws gripped my shoulders, pulling me backwards even harder onto his cock. I could tell he was getting ready to knot me. And I wanted it, so bad. I knew that it would hurt like hell, but I happily accepted his dominance.

His grunts became louder and rougher. He was very close now. I shut my eyes against the coldly staring animals. I could barely stand my excitement at the idea of getting bred by this handsome, dominant male. I tried to focus only on submitting. Obeying. Getting pounded. Getting marked.

With a final triumphant howl, Master suddenly pulled me backwards, forcing my whole body fully onto his cock. His knot, already rock-hard and pressing insistently against me, forced itself into my wide-stretched hole. I knew I was feeling pain, but I could only perceive the euphoria of finally taking all of him. I felt his huge dick swell and pulse powerfully inside me. He filled my guts with a giant load of his hot seed, sealed inside me by his swollen knot. More pulses jetted more cum into me, again and again. My guts and belly and ass were filled with his cock and his mark.

"You're mine now," he growled softly into my ear.

Somehow those words triggered an ecstatic wave of warm pleasure all over my body. I felt the heat of his cum in my ass. The warmth of his body as he pinned me down. The hot blood blood-hot girth of his huge cock and knot, stretching open my wrecked asshole. Then the heat seemed to concentrate, focusing to a climactic point right inside my balls. It made me cum almost instantly, my body responding involuntarily to the reward Master had just given me. My own jizz soaked the floor beneath us. And then I was totally spent.

The big wolf lay on top of me for a few minutes, nuzzling my neck and waiting for his knot to relax. My mind and body were totally empty. I had no energy or thoughts or feelings left at all. After a while he pulled out and stood, leaving me naked on the floor in a sticky pool.

"That was excellent, Chance," said Master, with perhaps a touch of pride in his voice. "I can tell we're going to get a lot of use out of you. Don't get up, you're going to be very tired for a while."

His words barely registered. I was so exhausted. I could only think about my handler's cum, now a permanent mark on me. Making me his, forever.

I fell into a deep, satisfied sleep there on the floor.