Chapter Text
Sam had the Best Dog in all the world. Dean was perfect, in every way. Loyal, affectionate, and utterly dependent on him. Sam enjoyed coming home to find Dean waiting at the door, pushing up onto his hind legs and letting his front paws droop over his chest as his cock cage caught the light.
It had taken years for Sam to finally break away from John, and steal his prize pup at the same time. Sam was grateful to his father for helping Sam train Dean, but his father had been getting too rough with the poor bitch.
Sam agreed that it was hot, watching Dean get bred by other dogs, but the constant shows, the double fisting's, the plugs… All of it had worn down Dean's body until he'd become seriously sick and seriously loose.
Finally, when John had said he was finally in talks with an interested stallion owner, Sam put his foot down. Dean was meant to be Sam's dog, and though Dean performed as perfectly as could be asked from him, it was a matter of physics, and Sam didn't want to have him treated for another prolapse.
John didn't like being told what to do with his dog, and even though Sam was eighteen and a man grown, john had struck him down when Sam refused to back down himself. That's when Sam realised that John only cared about Deans sexual service and not the Pup as a whole.
So, they had run away; Sam taking the impala, and Dean and telling John if he tried to come find them, Sam would report everything to the authorities, claiming he'd been a minor and threatened by his dad for his own part.
Two year's on, they had a little apartment where Sam could go to college and come home to Dean throughout the day. Now that Sam was 21, he'd given himself a birthday present with the cash he made on Dean's pairings.
Sam walked in, and there was Dean. He knew the sound of the impala in the apartment front parking lot, and rose up and barked once. The witches Sam hired had done a wonderful job, as Dean's puppy ears were seamless in his dark hair, pointed and healthy. His long fluffy tail swung behind his perky ass, the witches having reset his body and given him better knee joints for all the on fours walking he does.
Sam still put a cock cage on him during the day, attached to special harness, but usually when Sam was ready to bred his special bitch, he took it off and let Dean keep it off until Sam left the house again. Dean knew his bitch-clit wasn't for touching, and he'd be punished if Sam caught him pawing at it.
Sam had chosen a Siberian husky as Dean's bred because he felt both that Dean was energetic, loyal and mouthy, and that the dark grey steel coloring would match his complexion and eyes, as well as the fluffy fur being delightful to touch starting at his lower back and leading down to his tail.
"Did you miss me Dean? Did you?" Sam asked as he closed the door, and hiked his paper bag higher. The witches had helped with Dean's vocal cords as well, so that he could make more true dog whines as he fell to all fours and chased his tail once.
Sam grinned, and placed the bag down on the bench so he could squat to the floor and give Dean his praise. Dean came to his hands, rubbing cheeks and head against his palm until Sam started rubbing and pulling his ears through his fingers, "Nawww, I missed you too princess. I missed my beautiful bitch all day."
Dean rumbled pleased, and then turned, lowering his front and presenting his ass too Sam. His pretty pink hole was glistening just slightly in the furls, another well spent feature of the Dog alterations. the witches had placed Glands in his anus that secrete arousal fluid.
Dean's slick was one of Sam's favourite things to taste in all the world.
"God, Dean, I'd love too, but I brought you some things." Sam groaned with disappointment, even as he reached out and pressed a thumb against Dean's hole. With just a little pressure, Dean's body swallowed it, Sam biting his lip as he felt the soft, wet, warmth of his pet.
Dean whined, not because a thumb was anything worth complaining about, but because he needed more. He looked up over his shoulder, ears slicking back as he opened his mouth and panted, building into a needy yip.
Dean had looked fantastic with his plugs, but Sam appreciated just how tight Dean had gone back to being once the witches had finished the spell. Sam had hardly waited until he stopped crying and writhing from all the changes his body had been put through before trying him out right then and there.
He wasn't making it easy today either, tail curled over his back, whining and begging with his eyes as his ass took Sam's thumb deeper. Sam couldn't help twisting and turning and pulling on Dean's rim, cock twitching in his pants as he considered giving in.
"Damn it Dean," Sam groaned and swatted his ass with his other palm before pulling his thumb out and sticking it into his mouth to taste, "God you taste so good. Such a good ripe bitch for me aren't you?"
Deans curled tail wiggled and he pressed deeper into his presentation, cheek practically against the floor between his front leather paws, whimpering and panting. Sam pet his flanks and savored the skin there, pulling Dean back against Sam's crotch to grind his jeaned erection into the pup.
"Fuck, I got your testosterone shot in with the surprise," Sam breathed, knowing it can't sit too long. The hex bag could sit longer, so Sam made his choice, drawing away from Dean, "We have to give your shot first, then I can give your cunt what she wants."
Dean gave one more whine, but he dropped his hips and tail, pushing up onto all fours and trotting over to his bowl to take a drink while Sam readied the shot. As he did, he smirked seeing the little hex bag his witch on call had given him and his cock grew impossibly harder in his jeans.
Shot ready, Dean had moved to the lounge room, where he rolled onto his back on the plush rug, his paws up and his knees spread in a V. Sam admired the pup as he came over, glad that Dean was returning to his previous fit physique.
John had been so terrified of letting Dean act human, Dean's body and health had declined in the years running up to Sam's eighteenth and their escape. Now Sam lead him through exercises for dogs, but also, under his watchful eye, he was allowed to stretch out his legs and do a few human body things such as sit ups, push ups, stretches etc.
Still, Dean was a spoilt bitch so when Sam pinched his belly, there was still a little roll waiting for him to inject. Sam had the witches clean up the scar, but he'd kept Dean castrated, as balls on a bitch were useless, and Dean looked so pretty with that beautiful smooth skin between cock and ass. Dean didn't even react, just watching Sam's face for when it was done. Sam rubbed over the spot, and Dean rolled back onto his legs and started crowding Sam, snuffling, nuzzling and begging.
"Alright, alright," Sam laughed fondly, capping the syringe and placing it up on the coffee table, "our such a needy bitch aren't you Dean? How about you show me how needy you are."
Sam stood, unbelting as Dean jumped up, pawing at his thighs impatiently. Sam stopped and hefted a look that told Dean to settle down. Immediately, Dean dropped his front paws to between his spread knees, looking up as his tail quivered at the tip.
Sam couldn't stay annoyed long, so he smiled, watching Deans ears perk and his tail sway properly in response. Sam unzipped, and kicked off his jeans, sitting down and pulling his cock out. Dean was such a well trained Bitch he dropped his eyes to Sam's cock, but didn't spring forward, not until Sam nodded and gestured release, "Have at it Baby girl."
Dean spread his tongue over the underside, lapping up slow, just the way Sam liked it. When he reached the top, he curved his lips and took Sam's cock into his mouth, swirling his tongue, tracing in Sam's foreskin before sinking further.
Sam tipped his head back, putting a hand on Dean's head and gently rubbing Dean's ear between his fingers as Dean serviced his cock expertly without swallowing him deep. Sam loved this part, the affectionate way Dean worked tongue, lips head, suction to bring Sam the best pleasure.
the Pup was easily guided, as Sam pulled lightly on Dean's ear and Dean moved off his cock, and with a little guiding press, dove into Sam's balls. Sam groaned as Dean worshiped the parts he no longer had, making little pleased sounds and rumbles as he did.
Dean lavished his tongue all over them, then with a little push from Sam, took them into his mouth, sucking and gently rotating them. Sam pet through hair and ears, looking down at his pup proudly, "Such a good girl. That's it, make them nice and warm, ready to pump your cunt full of seed."
His dog redoubled his efforts, paws on Sam's thighs as Dean moved to the base of Sam's cock then back up. With little effort, this time Dean swallowed his cock down to the root and rumbled around it contentedly before he started to bob.
Sam let his head fall back and allowed his pet to do his thing, curling his toes with every time Dean's well trained throat swallowed around every inch, "Fuck, Dean. My prize bitch. So good at pleasing me, I almost want to make you swallow everything I'm making."
Dean whined and swallowed hard, tail moving with excitement. Sam laughed and rubbed his pups head, "No, I don't want to waste this. Come on Dean, up, up." Sam tapped his thighs and Dean pulled off slow and with a pop, before obeying.
With Paws on his chest, Sam helped Dean straddle his hips, lining up his cock with his pets Bitch-hole. Dean was eager, making soft noises in his throat, trembling with the movement of his tail as Sam tested his hole with the tip of his cock.
"You want it Dean? You want it?" Sam taunted, pressing just enough to feel Dean's hole start to give, still warm and soft from this mornings romp. Sam slid his hands onto Deans ass cheeks, filling his palms with doggy flesh that he pulled apart and kneaded, "Want my cock inside this fine bitch body? Speak Dean, Speak."
Dean barked in his face, and whined, leaning in so the paw prints on Dean's leather mitts pushed into Sam's shoulders. Dean licked under Sam's jaw and whimpered, pressing his ass back into Sam's grip and his ears flicking with begging need.
"Sit. Slow girl, let me feel it." Sam finally gave the order, and Dean, perfect trained bitch that he was, sunk down slow. He gave little pants of satisfaction as Sam stretched his hole, watching Sam with adoring eyes to make sure he was doing it right.
Sam let Dean lower himself down, watching with uninterrupted view. Dean's crotch had a gorgeous neat seam where his testicles used to be, and it was beautiful the way his caged cock bounced when he took Sam to the base.
"So fucking pretty," Sam cooed, moving one hand from Dean's ass so he could stroke his pet from stretched rim to the base of his bitch-clit. Dean squeezed around his cock, his pet trembling ever so slightly, waiting permission to start riding. Sam grinned looking into Deans pretty face, "Such a good pretty girl. My pretty girl. Ok Dean, you can take it."
Such a beautiful smile of relief on Dean's face as he started to move. With his paws on Sam's shoulders, and one hand on his ass, Dean started to bounce on Sam's cock without any reservations. Sam moved his free hand up too Dean's cage, unclipping the harness and sliding the cage off. Instantly Dean bit back a cry and his cock became hard dizzily fast.
Sam had come to realise that John had no faith in Dean. The cock cage wasn't just to stop Dean from getting erections, it was for Dean never to forget his place. But for Sam, he knew Dean was a bitch through and through, and stroking his cock was for Sam's pleasure, not the pups.
every time Sam wrapped his long fingers around Dean's length the pup bit his lip to stop naughty human sounds escaping. Every pump, every twist, every flick of Sam's thumb over Dean's cock-slit, had the pup tighten and flutter around Sam's cock.
"You know what your for don't you Dean?" Sam purred, content to let Dean ride himself tired, "Playing with your sweet fat clit, you should thank me. Gonna thank me pup? Thank me for feeding your slutty hole with my cock?"
Dean nodded stupid on sex, nuzzling into Sam's throat to lick and whine into his ear, just like he was trained. Dean's ear tips tickled and his ass slapped against Sam's thighs with wet sounds as Dean's slick escaped with each thrust. Sam groaned, moving his hand back to Deans ass, now spreading and smacking Dean's ass before he grabbed a hold of Deans tail at the base.
"Fucking made perfect for me. Fucking love your bitch-hole, my sweet pup. Gonna fill this heaven full. The only thing you fail at, is you can't catch." Dean's whimper turned apologetic, even as he worked his hips faster, fucking Sam into him hard and fast without sparing himself. Sam used his grip on tail and ass to shove Dean down as he started to drive his hips up, grunting with the effort of fucking into Dean's sweet heaven, "What kinda bitch can't catch some pups huh? Useless slutty hole, only good for dumping my load into. Faster Dean! You wanted my cock, you earn it!"
Dean's ears flattened and he dropped himself hard into every hilt, and squeezed tight with every pull up, his cock bouncing against Sam's abs as Dean panted, not daring to find release before Sam did. Sam fucked up harder, breathing hard with his own effort, slapping his balls against Deans ass, "Yes, yes, c'mon Bitch, C'mon my princess puppy, milk me with that useless fucking hole, Ah!"
Sam cried out as he dipped over, head falling back as Dean slapped his hips down in a hilt and rocked, pumping Sam's cock into himself with every every shudder of his masters orgasm. Sam knew Dean's sensitive insides would feel each pulse, the wet warmth exploding out onto walls that couldn't catch, but made Sam groan with want, "Fuck, Fuck. Yes. Ah, yes. Good dog. Good pup. Mmm, good, good pup."
Dean's rotations of his hips slowed to a stop, and his tail started to sway with Sam's praise. His own cock was still hard but Dean knew not even to think about touching it, let alone ask Sam too. That's why it was a surprise and a privilege that Sam wrapped his hand around Dean's cock and started to pump it.
"Such a good little bitch Dean, you really know how to make me stuff you full," Sam moved his other hand down to play with Dean's swollen rim, "too bad I don't have a knot huh? You can keep me warm, but I can't tie you like you need."
Dean dropped his forehead to Sam's shoulder, pawing at his chest softly with his mitts, twitching in Sam's hand. Sam grinned against Dean's temple, "yeah, you like getting fat knots in you don't you? makes you feel practically pedigree. Well don't you worry. I got the best present you."
Dean shifted his eyes towards Sam's face to read his expression, his cock leaking with impotent bitch juice. Sam could see Dean's question in his eyes, and Sam played with his hair and ear as he kept jerking off his pet while impaling him on his cock.
"Like I said, only thing your useless for is actually making puppies," Sam moved in, whispering into Dean's sensitive ear so it twitched, "I got another Spell. Gonna make my prize bitch fertile and get you all bred up."
Dean came with a cry that was almost human before he choked it down into a dogs whine. His impotent bitch juice dribbled out pathetically over Sam's fingers and Dean's eyes shone with tears as he looked at Sam, whimpering in his throat, begging with only the slightest shake of his head.
"Oh yes." Sam grinned wider, and brought his wet hand up, "Lick up your useless spend Dean. You can't deny you came at the idea. You're such a slutty puppy, it's time you were pupped."
Dean's tongue lapped at every drop of moisture, even as he kept eye contact with Sam, breathing hard as his tail curled half under his ass, brushing Sam's thigh. Sam chuckled, and pet Dean with his free hand,"Don't worry. I won't make you carry a human baby. This spell works with the one you already have, so only other dogs can knock you up."
His hand now clean of Dean's spend, Sam tapped Dean's thigh, "Ok, off. We got a lot to prepare for."
Rather then get off, Dean pushed in closer, trying to hold him inside and out. Sam frowned and bit out sharper, warningly,"Dean. I said, Off."
Dean gave a little whimpering cry but he ducked his head and shifted, letting Sam's cock slide out of him, along with some of his cum. Dean got back down on the floor and didn't have to be told to clench, trying to hold what he could inside himself. Nor did he have to be directed, licking Sam's cock and balls clean with the flat of his tongue before Sam tucked himself away and ruffled Deans hair.
"See? Just be a good girl Dean. That's all you have to do." Sam assured him, and got up, staying in his boxer-briefs, gesturing at his discarded jeans, "Dean, Laundry."
His pup moved to the clothes on all fours, picking up the jeans with his mouth and dragging them under himself as he trotted to the bathroom and the dirty laundry. Sam admired the way Dean's perky cheeks were clenched, his tail ramrod straight with the effort to let nothing more spill.
Sam moved to the kitchen and the bag he'd abandoned. With Dean's testosterone shot out of the way for a month, he should reach sexual peak in two days. Sam got out the hex bag and the instructions, sitting at the kitchen table as he started to read.
Dean came back and plonked down by the chair, resting one front pawed mitt and his chin on Sam's thigh with a reedy sigh. Sam placed his hand on Dean's head and pet him, knowing his pup wanted to ask questions but was too well trained to even try.
"Hey, it's gonna be ok Dean." Sam told him without looking at him, scratching around Dean's soft ears while he read over the small instruction booklet, "nothing here we haven't covered before."
So far it seemed pretty straightforward. Sam had to paint the symbols onto Dean, which was the same as when they had done his alterations. This time the blood came from a pregnant Dog, but the witch assured him it had been taken over time humanly and both bitch and pups were fine.
After that, he spoke the spell, and touched flame to the Blood painted symbols. they should all flare, Then sink into Dean, making the changes Sam asked for. There had been an option to give him a vagina, but Sam figured Dean's poor bitch-hole had done all the work, it deserved to be used the way all bitches were.
So after the pain of growing his womb had ended, They'd give him a clean out of his digestive track. After that, it was simply a matter of dousing him clean before enacting the Heat spell, where for a twenty four hour period, he'd be fertile.
"Ooo, this is cute." Sam shared with the pup who looked up at him with those beautiful eyes, "Says here, that your DNA will be read as canine. So they could have your coloring or temperament, but not be hybrids. Just little huskies pups, with your eyes, or your sweetness. Isn't that going to be great?"
Sam frowned as he saw Dean looked less than enthused, and put down the instructions. He took Dean's face in both hands making sure he saw the truth, "Hey. Don't worry Princess. I already got a friend with the perfect Stud picked out. tonight, we'll make you perfect, and tomorrow, we can meet your Stud so you can get to know each other before we start your heat huh?"
Dean's eyes welled up, and then a tear escaped when he shut his eyes as if to keep it in. Sam wiped it away with a thumb and kissed his temple lovingly, "You'll always be mine, I won't replace you, don't worry. And We'll stick to one stud for this first whelping ok?"
Dean's eyes shot open and Sam smiled to see it, "there's my girl. Yeah, that's right. just one stud, to make sure this whole process works right. Once the pups are grown and sold, we might see what kind of litter you'll drop from multiple fathers! It doesn't matter the breed, because they'll be half you and perfect!"
Dean closed his eyes again, and dropped his chin back to Sam's thigh. Sam let him, knowing he was overwhelmed with his happiness. Sam turned back to the diagrams and pet his head, "Good Girl Dean. My good girl…"