#s09e05

And now Dean looked uncomfortable as he tugged at the towel that was covering his hips. 

“Don’t tell me it’s gonorrhea again, Dean,” Sam groaned and rolled to his back, staring at the ceiling. “I thought you sai-”

“I don’t have the clap!” Dean interrupted him, whisper-shouting in the quiet motel room. 

“Wouldn’t be the first time,” Sam grumbled to himself, quiet enough that Dean shouldn’t have heard it if it weren’t for the spell still affecting him.

“It’s not that,” Dean repeated and stiffly walked over to his bed where The Colonel laid at the foot of it. 

Dean absentmindedly patted the dog’s head as he now stood fidgeting, just a few feet further into the room than before.

“What is it then?” Sam asked exasperatedly since Dean didn’t say anything but clearly wasn’t going to go to bed. 

“It’s-” Dean started. “I was just-”

Sam didn’t have to guess, knew Dean’s habits and schedules. “-jerking off,” Sam finished.

Dean looked at him sharply and Sam had to suppress a grin at the action.

“I- yeah,” Dean finally agreed and sat down heavily on the bed, the Colonel only shifting slightly but appearing to still be sleeping. 

“And what? You do that like three times a week, what’s so different now?” Sam tried again, a yawn splitting his face a second later. 

“There’s-”

Another pause.

“Dean, c’mon, either you tell me what’s wrong with your dick or I’m going back to sleep,” Sam grumbled, turning back to his side and facing Dean.

“It got like hard-”

“Yeah, that’s what usually happens,” Sam laughed, “that’s normal.”

“No,” Dean exclaimed, “there was like a growth that got like bigger and hard when I-”

Now Sam stopped him, not needing to hear it in all the detail. “At the base?”

“Yeah?”

“A knot?” Dean asked, sounding confused. 

Sam let his head thunk back onto the pillow. “Told you, you’re like a dog now.”

“What?”

“You play fetch, you bark at mailmen, you can’t eat chocolate and you grow a knot,” Sam said, eyes closing again as the exhaustion of the day set back in. 

“Yeah, dude, like dog’s have,” Sam explained, voice starting to slur with sleep. “Look it up.”

Dean didn’t reply and Sam took it as his queue to fall back asleep, his sleep thankfully free of nightmares of snake people and cheetah livers. 

..

Dean had swapped his towel for his own blanket at some point and was resting his head on Sam’s thighs, chin digging in. 

Sam woke up with a heavy weight on his legs and it wasn’t easy to shift under it. “Colonel,” Sam complained quietly, peeling one eye open before he suddenly felt a little too awake.

It wasn’t the dog curled up on and against Sam’s legs, no, it was his big brother. 

It was seven thirty and as Sam looked around he saw the other reason he had woken up. The Colonel was sitting in front of the door, whining in an annoyed manner. 

The Colonel gave a short yip which Sam took as an affirmation before he finally opened the door and let the dog out to presumably do his business. 

“Sorry,” Sam said automatically as he pushed Dean off and stumbled out of the bed, his legs almost numb. He staggered towards the door and gripped the door handle but stopped at actually opening it.

“You’re coming back, right?” Sam asked even though he wasn’t the one that could talk to animals. 

“Sammy?” Dean asked from behind him, making Sam turn around.

“Dude, wrong bed, you know,” Sam just said before walking back to where his duffel lay on the ground. He bent down, back towards Dean as he looked for his last clean pair of socks for the day. 

There was a rustling sound and Sam expected Dean to get up from the bed but instead hands gripped his hips and pulled him back into Dean.

“Dean,” Sam squeaked and tried to step forward again. 

“Smell so good,” Dean mumbled, muffled by Sam himself.

“Fuck, Sammy, this spell, I swear,” Dean said and pulled Sam in closer.

Sam’s rear connected with something solid and by the warm, moist air hitting him, Sam was pretty sure that his brother’s face was practically in his ass now.

“Dean, what are you-?” 

“What?”

“Smell so fucking good,” Dean said and Sam could both see and feel Dean breathing in deeply, the fabric of his boxers getting heated by Dean’s damp breath. 

There was a tongue licking at his boxers now and Sam tried to shove Dean away but the pathetic whine his brother let out made him loosen his grip again. 

“Dean, I don’t-”

“Please, Sammy, you smell so good.” 

Dean took it as a positive thing apparently because he added a tongue to the mix now and soon he was pulling Sam’s boxers down. 

As he was tugged back again, Sam stumbled, his legs getting tangled in his boxers until he fell onto his bed, Dean quick as he shoved Sam down into the mattress. 

“So good, Sammy. You smell ready to mate, to breed, to-”

Sam tried to twist in Dean’s grip again at that but his brother licked over his bare ass in apology. “Sorry”

“Please, Sammy,” he whined and there was this quality to his voice that was new ever since he had taken that potion and Sam was powerless to do anything. 

It was an odd sensation and Sam couldn’t quite say if he liked it or not. 

Sam grumbled but didn’t fight it when Dean grabbed his hips to pull them up, nestling his face between his asscheeks, tongue darting out again. 

“What’s going on with you?” Sam asked, voice a bit high pitched and muffled.

Sam wasn’t a virgin, not even the anal kind but this was new and now Dean was letting his teeth scrape over the sensitive flesh, making Sam jump a little before Dean’s hands kept him still.

At first Sam didn’t think that Dean would reply but he ended up pulling off a moment later. “I don’t know, just need to,” he said, burying his face back in between Sam’s ass cheeks. 

And okay, yeah, it was a little weird that Dean was licking and panting at his ass but Sam had to suppress a moan when Dean pointed his tongue and started to pierce his hole.

A few moments later Sam not only finally let himself moan out loud, he also noticed that the bed was rocking weirdly, making him look back at Dean. 

Dean was humping the bed. 

Dean was humping the bed like a dog and sniffing around his ass like a dog and his brother’s dick had a knot like a dog…

A spell to just understand animals, yeah right. Fuck.

Before Sam could even say anything, Dean whined again, apparently not satisfied with what he was doing anymore. He shifted and the blanket finally fell away, Sam realising that Dean had been naked all night which also meant that Dean had curled up next to him naked all night. 

“Wha-”

“I need to fuck you,” Dean said at the same time.

“Dean, I don't think we should,” Sam protested.

Sam raised his eyebrows, logically knowing that it was where this was going but still not prepared for the demand.

Dean only shook his head, reaching down to Sam duffel and expertly extracting the travel size of lube Sam sometimes kept in there. Which also told Sam that Dean went through his stuff on a regular basis to know that. He would be pissed about that later, right now his mind was pulled back to the moment when his brother spoke again.

“Now, need to fuck you now,” Dean growled, the cap of the lube snicking open and Sam felt warm hands and cold liquid on his ass again. 

Dean was panting behind him as he shoved not one but two fingers into Sam’s underprepared hole. Sure, his tongue had been nice and he had loosened up a little but it hadn’t really been enough to skip the single finger treatment. 

Sam groaned uncomfortably and Dean licked at his ass again in what Sam thought was an apology but Dean didn’t say anything, only added more lube and fingers until he deemed Sam stretched enough for his dick.

There was no warning when Dean pulled his fingers out just to immediately shove the head of his dick inside. It burned and Sam gritted his teeth while his body tried to adjust to the intrusion. 

“Yeah, gotta fuck you, gotta mate, gotta breed,” Dean replied, sounding far away as he began pounding into Sam. 

Dean didn’t let him though as his brother pushed his hips forward, sending Sam back to the mattress and seating his dick all the way inside, Dean’s hips meeting his ass with an audible slap.

“Fuck, Dean,” Sam breathed out heavily.

Sam’s prostate was getting hit on every thrust, moans punched out of him at the sharp zings of pleasure up his spine. His cock was rock hard underneath him, pre-come dripping onto the bedding as the force of Dean’s movements were rocking him and the bed both. 

It was quick and brutal, almost animalistic in the way that Dean’s dick was splitting him open and making Sam whine. Dean was only growling in response, his hips not stopping. Dean’s body was covering him all over, his brother’s sweaty chest pressed to his chest as he nosed at Sam’s hair. 

“God, Sammy,” Dean groaned, tongue laving over Sam’s neck before he began nipping at his ear and throat once more. “Taking it so good.”

It almost felt like the pressure in his ass was increasing, like Dean’s dick was getting bigger. 

Sam wanted to say something else but Dean’s hips got erratic, not pulling back far since his knot had swollen too much and Sam could feel it pull against his rim. A moment later Dean’s nipping turned into a bite as he clamped down on Sam’s shoulder, making Sam yelp in pain. 

Sam stiffened as he remembered that that was most likely exactly what was actually happening, Dean’s knot growing and catching on his rim, only increasing the pleasure pain he felt.

“Wait, Dean, the knot,” Sam tried to say but it got lost in a warble of sounds as he moaned while Dean growled deeply, shoving his dick in as far as it would go. 

“Did you just bite me?” Sam asked breathily and with just a touch of hysteria. 

Dean didn’t let go to answer, just rocking his hips and presumably coming deep inside Sam. 

The feeling of Dean’s knot stretching him wide while also plugging him was almost enough for Sam to forget about his own arousal before Dean unceremoniously wrapped his hand around Sam’s dick and started stripping it quickly. 

Sam had no choice but to take it, trapped under Dean and on his dick as his brother jerked him off just a touch too roughly.

It didn’t take long for Sam to be brought over the edge, his come soaking into the bedsheets below him as Dean continued to stroke him.

Only once he had let go of Sam’s dick did he also let go of his shoulder, teeth unclamping just for him to start licking at the bite instead. 

Dean shifted then, letting them fall onto their sides, his knot pulling uncomfortably at Sam’s rim and reminding him that his ass was still full of Dean’s dick. 

“Did so well, Sammy,” Dean slurred, hips still moving a little. “Took me so well.”

Sam could only respond in a groan, not sure he knew what to say but Dean didn’t seem to mind, his tongue going back to licking at Sam’s shoulder.