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writethelifeyouwant · 2 years

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Dog Dean Afternoon

Summary: The spell worked a little differently than they’d anticipated.

Pairing: Sam x Dean (as a dog) Rating: 18+ Warnings: Bestiality Tags: Established Wincest, weirdly fluffy start, then it all goes downhill pretty fast from there, bottom Sam, top Dean, dog!Dean, Sam has a bestiality kink, dirty talk, knotting, dead dove do not eat Word Count: 2.8k Bingo Squares: @samwinchesterbingo - Case Fic

A/N: Yeah… I don’t know what to tell you other than: Yes. You read the tags right. Dean turns into a dog, he fucks Sam. They’re into it. If you’re not into it that’s totally fine, just scroll on!

The spell worked a little differently than they’d anticipated.

Sam stared down at the German Shepherd currently sitting at his feet, looking up at him with open adoration and wagging his tail across the carpet eagerly. One minute he’d been looking at his laptop, reading up on some lore, and the next the chair across the table from him where his brother had been sitting was vacant and a large dog was sniffing around his feet.

“Uh… Dean?” Sam asked hesitantly, knowing he sounded ridiculous, but what other explanation could there be to a sudden disappearance of Dean and simultaneous appearance of a dog that had not been there moments before.

“Ruff!” A deep, booming bark responded, and Sam had a feeling that translated as ‘yes’.

“Can you understand me?” he asked next, and dog-Dean answered with an identical affirmative bark to his first. “Okay, well, that’s good… I guess,” Sam mused out loud, still shell-shocked by this turn of events.

There was a moment of awkward silence as Sam stared at his brother before he let out a shaky whoop of laughter.

“I gotta be honest man, I don’t know what the hell to say to this,” he ran a hand through his hair, trying to think. “I guess we just wait until it wears off, right? The spell said it only lasted like forty-eight hours or something, right?”

Dean made this sort of whiny-growl noise that Sam thought might be some kind of warning to stop laughing at the situation, but he just couldn’t help himself. The dog stood up and walked pointedly towards the motel door, jumping up to stand on its hind legs, and tried to bite the handle, jiggling the lock. Sam surreptitiously picked up his phone and snapped a couple photos.

When he didn’t manage to get the door open, Dean sat back on his haunches and barked at the offending object, then swivelled his head to look at Sam, then back to the door, then barked again.

“What do you want?” Sam asked in a slightly babying voice, the way you would talk to a child who wasn’t great at communicating their needs yet. Or, you know, a dog.

Dean barked again, baring his teeth this time to illustrate his displeasure with Sam’s tone. He scratched at the door and when that only engendered more laughter from Sam, he trotted over to the man, ducked his head, and bit firmly at his brother’s ankle, causing Sam to jump up in alarm.

“Ow! What the hell was that for?” he griped, trying to bat the dog away, but Dean was insistently butting his head against the back of Sam’s knees, urging him towards the door of the motel room. “Okay, okay, calm down!” he admonished Dean in exasperation, reaching for the Impala keys. “I was just messin’ with you, c’mon, let’s go to the pound and see if you can understand dogs like you’re supposed to,” Sam laughed as Dean growled at him in annoyance, but the dog trotted after him obediently nonetheless.

Sam thought the visit to the dog pound went well. As soon as they’d walked inside, Dean had run off towards the kennels and the ensuing cacophony of barking was loud and lengthy. Sam took it upon himself to distract the poo volunteer that was running the shelter at the time by taking him outside and quizzing him about dog care. On the surface, this was just a stalling tactic to give Dean time to talk to all the dogs inside, but in the back of Sam’s mind, it occurred to him that if something had gone really wrong with the spell and they were stuck with Dean in German Shepherd form for longer than the prescribed length of time, he might actually need to know all the stuff that the volunteer was prattling on about.

Back at the motel, Dean ran into their room and immediately jumped up on one of the beds, walking himself in a circle and pawing at the ratty comforter until he was satisfied, then curled himself into a circle and settled down with his head tucked over his legs. Sam watched him bemusedly, wondering how much of this behaviour was basic dog instinct, and how much was his brother. It seemed pretty evenly split in his opinion.

Normally, at this time, they’d be thinking about what to get for dinner, and that presented Sam with the curious conundrum of what to feed Dean. Should he go buy dog food?

Dean growled viciously when Sam suggested the idea, so he decided to go with the Dean classic of burgers. He skipped most of the toppings his brother normally went for, simply providing him with some cooked burger patties and a side of bacon, but Dean seemed satisfied with this offering, eagerly wolfing down his own portion, sitting on a chair at the table with Sam and eating off a plate, because he had growled yet again when Sam had tied to place the dish on the floor for him.

Sam was getting quite good at interpreting ‘fuck off’ in dog language.

They couldn’t proceed with working the case until Dean changed back from dog to human form so he could actually tell Sam what he’d learned from the other dogs at the kennel. Sam had tried to get Dean to spell things out for him using a bunch of words and letters written out on index cards, but the results had been frustrating to say the least, so they’d set them aside and decided to wait out the duration of the charm.

Bedtime presented an interesting problem too – just another on the extensive list that had resulted from this whole ungodly incident. Typically, Sam and Dean would spend most nights in the same bed, unless they were pissed with each other about something. Dean clearly expected business as usual tonight despite his current form, because when Sam tucked himself under the covers, the dog jumped up on the bed right next to him and nosed his way under the comforter, shifting awkwardly onto his side and attempting to spoon his younger brother. It was sweet, really, Sam thought. Dean was actually much more eager to cuddle as a dog; if he’d been human, that whole routine would have been accompanied by grumbling and a facade of reluctance. Sam wasn’t opposed to this particular shift in behaviour.

At first.

After a few minutes of the heat ratcheting up between them, Sam shifted a little to rearrange the furry leg –arm?– that was draped over his middle causing him to sweat. Dean as a dog was even more of a furnace than usual. That’s when he felt it. It was poking at the small of his back, rather than the crack of his ass where it normally rested, but there was no mistaking it. Dean was hard, and his doggie cock was rubbing casually against Sam’s body as if this was any other night. Except Dean was a dog.

Heat began to overwhelm Sam for an entirely different reason. Unbidden, his thoughts flashed back to a case a few years ago with their friend James –a witch– and his familiar. Portia had the ability to shift between her human form and her alternate, a large German Shepherd. Dean as a German Shepherd was even larger than she had been. At the time, Sam had congratulated Dean on not stooping to the level of making a bestiality joke when James had confessed about the true nature of the relationship between him and Portia, but it had been an uncontrolable urge on Sam’s part to see what Dean would say when he mentioned the B word - because Sam’s brain had immediately gone down that road from the second he knew what the girl was. It had been Sam’s attempt at subtlety, bringing up bestiality in a way that could easily determine Dean’s feelings on the subject without revealing Sam’s own thoughts.

Because he had had a lot of thoughts. When Dean had transformed into a dog earlier that day, they had briefly flashed through Sam’s mind, but he’d pushed them aside easily in favour of the case at hand, they had work to be doing, after all. But now, when there was nothing left to do but get a good night’s sleep and wait for the spell to reverse, when Dean’s obvious erection was beginning to rut more intentionally against his back, Sam had something serious to consider.

Was he really contemplating this? Letting Dean fuck him like this? Letting a dog fuck him like this? As if he could hear exactly what was running through Sam’s mind, Dean let out a whine and tried to wrap Sam more tightly in his paws, humping against him with a pathetic, animal desperation that had Sam’s dick throbbing painfully in his boxers.

Fuck. Am I actually… yeah, Sam decided as he reached over his shoulder to run a hand through the thick shaggy fur of his brother’s coat. Yeah he was gonna do this. Who knows when else such a perfect fucking opportunity would present itself? No pun intended.

Cautiously, Samm rolled himself around so he was facing Dean, the dog’s paws still draped over his waist and thigh. He wrapped his arm under Dean and pulled him in gently, rubbing his cheek into the fur of Dean’s neck and scratching behind his ears. The dog gave an appreciative whine and bucked his hips again, and Sam took a deep breath, steeling his nerves and trying not to fly out of his skin with excitement and guilt-ridden arousal as he skimmed his right hand down the fur in Dean’s chest, over the soft, velvety skin of his belly, and down to his cock.

The dog dick was wet, practically slimy, and it should have put Sam off immediately, but with an embarrassed groan he felt his own dick twitch in his shorts, pushing out its own drops of arousal. It felt smaller than Dean did as a human, but Sam knew that would change – dogs got bigger when they fucked, the pressure of a willing home wrapped around them prompting more blood to flow to the extremity, stretching it hard and wide until… Sam gulped and whined at the thought – the knot.

God, he knew he was sick, he knew it was insane and disgusting but he didn’t fucking care anymore. He wanted this dog cock to stuff his hole and knot him like a bitch.

“Fuck, Dean,” Sam groaned, moving his hand over the wet doggie dick, pressing a finger against the leaking slit and gathering the slick on his fingertip. hesitantly, he brought it to his lips, then sucked it in, letting out a whine that nearly matched the desperate pitch of the dog’s.

Working quickly now, Sam shoved his boxers off and threw the blankets haphazardly down by their ankles so he could move more freely. Dean wriggled a little, as if unsure where to move to, so Sam made the decision for him, helping him roll a little more onto his back so his belly was facing up in the air. He couldn’t tear his gaze away from Dean’s cock, angry red and dripping wet, only about half of it poking curiously out of its soft sheath. Sam reached out, mesmerised, and ran his hand over the base that was still covered. The dog panted happily when he sped up his persistent touches, so Sam took that as a sign that Dean enjoyed being jacked off by his brother just as much as a dog as he did when he was human.

Without pausing to think too hard about the reasons this was still all a very bad idea, Sam bent over and sucked the flared tip of the dog’s dick between his lips, rolling the flesh eagerly against his tongue. It was so wrong, so unbelievably fucking wrong, and that’s exactly what had him reaching down to wrap a fist painfully around the base of his dick, because he was in serious danger of busting his load over the sheets in about two seconds.

It kind of felt like the first time Sam and Dean had ever touched each other – the taboo so hot and overwhelming they both cum quicker than teenagers losing their virginities, despite the fact they were both well into their twenties and far from virginal at the time. Apparently incest was no longer the limit of the sick and twisted shit they were willing –eager– to do to get off.

Dean’s cock was growing noticeably in Sam’s mouth, and to his astonishment, he could already feel something thick and harder forming at the base of the dog’s shaft. Fuck, if Sam wanted that knot stuck in his ass rather than his mouth, he had better get a move on. He let Dean’s cock drop from his mouth reluctantly and scrambled off the bed quickly to find their lube.

Fingering himself open had never been Sam’s favourite thing, he had always preferred Dean to do that, and his wrist cramped up funny as he bent his arm behind himself and began to stretch his opening. Partly out of laziness and partly out of curiosity of what it would feel like to be stretched open on doggie dick, he only worked two fingers inside before he gave up and dropped onto the bed on his hands and knees.

The large German Shepherd circled him, snuffling around Sam’s neck, beneath his arms, the crease of his hips - scenting his bitch before he mounted him. The tongue took Sam by surprise, and he yelped and twitched out of reach when Dean’s long tongue licked in a solid stripe from his balls up to the crack of his ass. Dean wasn’t happy that he was trying to avoid his investigation of his hole though, because he immediately followed Sam across the bed and stuck his tongue firmly back where he wanted it, which was laving enthusiastically over his brother’s freshly lubed hole.

“Fuck, Dean,” groaned again through clenched teeth. “Fuck, why does that feel so good?” Obviously he wasn’t expecting Dean to answer him, but the dog gave a sort of yip, his teeth grazing over Sam’s flesh and making the man shiver, and Sam kind of thought that might have been Dean telling him: “shut up and enjoy this, bitch.”

It seems that the appeal wore off very quickly for Dean though, because he only treated Sam to a few more rough licks before Sam felt the dog’s paws scrabbling over his back awkwardly, trying to find purchase in an unfamiliar position. He could feel Dean’s cock slipping eagerly across his back, but the dog wasn’t having much luck with aiming. It seemed like all he could manage was catching the head of his cock on the rim of Sam’s entrance before it skimmed by and Dean would whimper in frustration.

“Sh, sh, it’s okay,” Sam reached behind him to run his hand through Dean’s fur, comforting him as if this was actually a dog and not his big brother. Dean would give him shit for it later, he was sure, but the playacting was making Sam even harder, so right now he didn’t give a fuck. “Take it easy boy, lemme help,” he grunted, his hand groping behind him blindly until he felt the dog’s cock.

Sam gripped him firmly and directed the cock back towards his hole, rubbing the tip insistently over his entrance until –finally– Dean slipped inside. The groan that ripped through Sam was practically inhuman as the dog began to fuck him furiously, without any care for Sam’s comfort, just using his body to accomplish his goal – and Sam was one hundred percent okay with that. More than okay. He was being one hundred percent, completely and utterly ruined by a fucking dog cock and he fucking loved it. And the knot wasn’t even inside him yet.

He could feel Dean trying to force it inside of him, but his thrusts were becoming increasingly erratic the closer the dog got to his own finish and Sam was becoming impatient.

“C’mon boy, fuck me, fuck that knot inside me, good boy. Yeah, there you go buddy, make me fucking take it,” Sam practically growled the last words as Dean’s knot forced its way inside his hole, stretching him past the point of comfortable, but the pain and ultimate sign of submission was what did it for Sam. As Dean pumped ungodly amounts of doggie cum into his ass, Sam came untouched onto the sheets beneath him, panting just as heavily as the dog now locked with him. It was just as well that Dean in dog form seemed to enjoy cuddling, because Sam wasn’t entirely sure how long they would stay knotted together.

However long it turned out to be, he had a feeling it wouldn’t feel like long enough when Dean pulled out and left him empty again.

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