Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/6262144.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Supernatural
  Relationship:
      Dean_Winchester/Sam_Winchester
  Character:
      Dean_Winchester, Sam_Winchester
  Additional Tags:
      Alpha/Beta/Omega_Dynamics, Age_Swap, Alpha_Dean, Omega_Sam, First_Rut,
      Blow_Jobs, Riding, Knotting, Multiple_Orgasms, Plot_What_Plot/Porn
      Without_Plot
  Stats:
      Published: 2016-03-16 Words: 3564
****** Caring for a Young Alpha ******
by castielsstarr
Summary
     "For the last few years, they had been telling him what would happen
     if he presented as an omega and went into heat, but they hadn't
     thought to warn him of what a rut was like."
      
     Sam wants to help his younger brother through his first rut. Dean is
     16.
Notes
See the end of the work for notes
A slight creaking woke Sam in the middle of the night, the sound coming from
his little brother’s side of the room. Usually he wasn't quick to waken at a
sound so small, but something was keeping him on edge. He wasn't able to put
his finger on why, but both him and Dean had been fidgety most of the night.
When Sam looked over, there was no denying what the mystery creaking was. The
bed was rocking back and forth as Dean humped against the mattress in his
sleep. His eyes were shut tight, but his mouth open with heavy breaths. A wide
expanse of freckle-dusted skin showed as the sheet slipped around his hips,
back exposed to the air. He usually kept it wrapped tight around his shoulders
when he slept, but it had fallen to his lower back and was slipping lower still
with each downward thrust.
“Dean,” Sam hissed, hoping that the boy would stir and stop rutting against the
mattress, but he didn’t react. At the same moment that Dean growled low in his
throat, Sam caught a wiff of the crushing, overpowering smell of alpha.
Holy shit.
His little brother wasn't supposed to be an alpha. Both Sam and their dad had
thought that Dean was going to present omega or maybe beta, but they hadn't
guessed this. He was too small to be an alpha. He didn't have the muscular
build, the height, or the aggression that went along with it.
That scent was undeniable, though. Full-fledged alpha. It was musky and deep
with hints of what he thought smelled like cinnamon. The reaction it caused was
unlike any he’d had to any alpha he’d come across. Sam could feel the way that
deliciousness was settling in his bones, wrapping around him, warming him, as
he inhaled. He'd be a damned liar if he said his cock wasn't hardening beneath
the sheet that covered him, too.
Dean groaned from the other bed, continuing to grind against it as the next
coherent thought came to Sam's mind. If Dean just presented as an alpha, that
meant this was his first rut. He wasn’t prepared for this. For the last few
years, they had been telling him what would happen if he presented as an omega
and went into heat, but they hadn't thought to warn him of what a rut was like.
The next growl trailed off with a whine and he knew that Dean was going to need
help.
Crawling out of his bed, he made it a couple steps before the next wave of
Dean's scent hit him, stronger than before. It made him gasp and he could feel
his body responding to it like a good omega, slick starting to leak onto his
thighs. When he reached the other bed, he had to sit down on the edge and take
a few breaths to steady himself. His own scent was now filling the room, too,
and he knew that something was off about it. The combination of their scents
shouldn’t smell that intoxicating. It was thick in the air and he wondered if
he could taste it if he stuck his tongue out. He didn’t, though, and brought
his attention back to his little brother.
The sheet had shifted far enough that it left the majority of one whole ass
cheek exposed and his right thigh and leg, though Sam couldn’t see anything
else. However, it was more than enough to let him know that the young alpha
hadn't worn boxers to bed that night, either. The room had already been filled
with summer heat and the room lacked an air conditioner, which was only going
to make this worse for the teen. Whether in heat or rut, it was normal for the
body temperature to spike. The heat was annoying before and it was probably
edging on unbearable now.
Now that Sam was next to him, he could see that Dean wasn’t humping just the
mattress. He had shoved a pillow between his legs at some point during the
night and was working himself against it. Even in the dark, he could see the
way it was covered in dampness. Sixteen year olds leaked like crazy when they
were horny anyway, but a fresh alpha was something else. Brand new ones leaked
from their cocks almost as much as an omega’s hole. Dean whimpered and he knew
he had to be starting to chafe by this point. Slick fabric wasn’t going to be
enough.
Freckled skin was hot and sweaty when he touched Dean's shoulder. God, even
Sam's fever had never gotten that high, even during his first heat. Should he
get him a cool compress instead? He knew it wasn’t going to help much. The
quickest way to get an alpha’s fever down was to get his knot inside of an
omega. This wasn’t even close to the first time Sam had thought about it—he
just had to make sure that Dean was on board. The boy didn’t respond to the
first few nudges, but after a hard jostle to his shoulder, the alpha woke up.
Dean's eyes flew open and he gasped, startled both by the person waking him up
abruptly and the final jerk of his hips against the pillow before he realized
what he was doing. He was panting hard as he met the omega’s eyes, trying to
get his body back under his control.
"Sam? Why are you—what's happening?" He growled low and loud, the sound
rippling through Sam's spine. He looked surprised that the noise came out of
him, but to Sam it felt like it was tugging at those small dimples above his
ass, making him want to present for his little brother. He wanted so badly to
be claimed, even though it was considered almost shameful to be an older omega
taken by a younger alpha.
He needed to focus on Dean right now, not his own urges. "Remember how, uh, Dad
and I told you what would happen if you presented as an omega?"
"Yeah, b-but—" He grunted under his breath, trying to keep his focus on Sam.
"—this isn't like what you told me. Fuck, it hurts!”
His hand slid from shoulder down to rub small circles at the small of Dean’s
back, the motion making the boy shiver violently. Any touch was going to drive
the alpha in him crazy right now, but Sam couldn't stand the idea of taking his
hand off his heated skin. His omega wanted more, but for right now it was
placated with touching. "You're right, this isn’t the same. This is a rut.”
“A what?” Dean looked confused.
“Rut. It's the equivalent of a heat, but for alphas. We thought there was
little chance of you presenting as an alpha since the only other one in our
family was Mom’s dad, so we didn’t talk to you about this.”
Frantic, panicked looks passed over Dean's face and he was shaking, gripping at
the sheets. They were balled in his fists as he tried to keep still, tried not
to shamelessly grind against the pillow beneath him. There was nothing there to
be ashamed of, but Dean didn't know that. It was Sam’s fault that he was so
scared right now and that wasn’t acceptable.
"Hey, everything's ok. Just breathe."
"Can't.” Dean’s breaths were coming short and fast, almost hitting the level of
hyperventilation. “It's so hot in here." His concentration broke just enough
and his hips bucked forward, making him moan loudly as his dick rubbed against
the pillow. Dean tried to bite back the rest of the moan, clenching his jaw
shut tight, but it failed to muffle anything. "I'm s-sorry."
"Don't be.” The sound traveled through Sam, tingling along his hardened cock
and tight balls before rushing back to his hole. Sam could feel a small gush of
slick soak into the bedding beneath him and it was all he could do not to moan,
too. It was the same as when he had come home early from work one day and
accidently caught sight of Dean masturbating, jacking his cock with one finger
pushing into his ass. He hadn’t wanted Dean to be surprised or frightened by
the intense need he was going to have when he presented omega, so he had said
that fingers would help ease him into it. “We need to take care of you or it's
going to get worse."
Dean groaned, and it wasn't in pleasure. "It can get worse than this?” He
shifted a little, and it was easy to tell that he was pulling his cock away
from any contact with the way his ass canted up. It already feels like I'm on
fire and drowning at the same time."
At least part of that was an easy fix. "Here, let's get the sheet off you."
"N-no!" He grabbed at the edge of it, pulling it higher up his back. "I'm, uh,
it was hot and I didn't wear anyth—"
"Dean, I know. Your ass has been hanging out for a while now."
The heat of embarrassment would have visibly crept up his cheeks if they
weren't already flushed red and he looked away. Without rubbing himself against
anything, a small moan fell from his open lips. Sam could see his nostrils
flaring as he scented the air, finally focusing enough to pick up on it. "Is
that you? Why do you smell so good?"
Fuck, Dean could smell it, too. Sam had to take a calming breath and look away
from the little alpha. He needed to keep collected right now, not give into the
omega instinct that was telling him to put his ass in the air and beg for it.
"That's your alpha being attracted to my omega. It finds something it likes and
your brain tells you that it smells good. It's how mates find each other."
Luckily, the mate part didn’t stick in his mind, but Dean jumped to a whole
different issue. "But you're my brother. How can I be attracted to my own
brother?"
Sam didn't really have a good answer and "just 'cause" wasn't going to suffice.
Luckily, he didn't have to come up with anything right then because Dean whined
a little, a sound still so rare even on new alphas. "My dick hurts so bad,
Sam."
He turned back to Dean and the words tumbled past his lips before he could even
think about stopping them. "If you roll over, I can help take care of you. I
can make the hurting stop." More slick was seeping out of him at just the
thought of getting fucked open on his little brother’s cock. It didn’t matter
how big or thick the alpha was, Sam just needed.
Dean was about to protest—could see it in the way his jaw set as he opened his
mouth to speak—but Sam interrupted him before he could. "There aren't any 24-
hour pharmacies around here, so we couldn't get you a toy until morning. That’s
at least six hours and the pain is only going to keep getting worse. I don’t
like seeing you hurting, alpha." He couldn't fight what his instincts were
telling him anymore and he ducked his head to nuzzle into the hair behind his
little brother's ear.
Something must have clicked in Dean with the omega's act of submission because
he rolled off of the pillow and tossed it away, centering himself in the middle
of the bed. With the way his hips rolled underneath the sheet pulled taut over
his groin, it was easy to see how long and hard he was. His cock was large and
Sam whimpered at the sight of it. Dean still didn’t say anything, but he was
biting into his lower lip in a way that couldn’t be anything less than
seductive.
"I promise I'll make you feel better," Sam whispered as a decent portion of his
control broke and he leaned down to mouth sloppy kisses against the skin of
Dean's stomach. The movement could have ruined everything, but the alpha's
panting grew louder as he moved lower over sweat-salty skin, closer to what
Dean needed.
He replied as Sam dipped the tip of his tongue into his belly button, then
kissed the trail of fine hair below it. "I never, ah, thought my first time was
going to be with my big brother."
Relief flooded him to hear the alpha consent to it. He was getting too worked
up and he didn’t want to stop—his own dick swinging rock hard between his legs
and hole fluttering around nothing, wanting to be filled. He would have stopped
if Dean didn’t want this, but it would have been hard to pull himself away.
The white cotton bedding was still covering Dean’s cock and Sam kneaded him
through the material causing Dean to cry out and thrust against his hand. The
fabric was already wet where he had soaked through that, too.
"Have you gotten a blowjob before? Maybe from any of the girls at school?" His
hand had stilled, but Dean kept rubbing against it passively, almost like he
didn't notice he was doing it.
"Yeah, of course,” he said, panting. “A couple of girls."
"Good, then you’ll have something to compare it to.” Sam removed his hand and
pulled the sheet down, watching as Dean's cock sprang free, bouncing a few
times against his stomach. There was a small ring near the root where his knot
was starting to show, waiting to swell and fill more. Fuck, he needed to make
it pop. “This is going to feel better than before."
Sam took the head and most of the shaft into his mouth without any more
preamble and sucked, causing Dean's back to arch off the bed. He kept with the
motion, never moving low enough to take that swelling ring into his mouth. It
was bigger than before, starting to fill with come. His cock was enormous, but
it wasn’t until it was inside Sam’s mouth, stretching his lips wide, that he
realized just how big. A sixteen year old shouldn’t have a cock as thick around
as a beer bottle, but Dean’s was certainly close. Sam realized he desperately
wanted it splitting open more than just his mouth.
He pulled off and gave a few appreciative licks to the head, the flat of his
tongue passing over Dean’s slit, causing a large bead of precome to burst from
it. Sam paused for just a second to ask, "How does it feel?" before his mouth
enveloped Dean again.
"Fuck, S-Sam. It's—aaahh!" He tossed his head back as his older brother took
him deeper, his lips pushing down over the knot. His head bobbed slightly,
keeping lips sealed tight as they shifted back and forth over his knot. It was
starting to expand, forcing his mouth wider, skin cracking at the sides. It was
one of the few pains that still felt so deliriously good and Sam moaned in
tandem with Dean, the vibrations thrumming into his knot, making him scream.
Luckily, the motel was trashy enough that no one was going to come knocking on
their door telling them to shut up.
It took a few slow and shallow sucks to ease Dean back down from his high
before Sam was willing to pull off. He leaned up over his younger brother,
their eyes meeting and holding the other’s rapt attention. Sam leaned in close,
letting the bare traces of his words be felt over Dean’s face in puffs of air.
"You're going to have such a huge knot when you finally come. I can't wait to
have it filling me up."
Dean swallowed thick, his throat clicking with the lack of moisture. "Won't it,
uh, hurt you?" He was having a hard time catching his breath and the shivering
started.
Sam shook his head and moved, legs landing on either side, so that he was
straddling Dean's waist. "Omegas are designed to take knots, remember? I've got
this to help me." Two fingers reached behind to swipe at his hole, collecting
the slickness that was soaking him now. He brought those fingers back to show
Dean how wet and ready he was, but he didn't anticipate his brother grabbing
his hand and sucking those fingers into his mouth.
If Sam didn't know better, he would've guessed that Dean just came from the
sound that he made at getting to taste his older brother. He suckled and
thoroughly licked each digit until the slick was gone, then let them slide from
his mouth. The growl was back in his voice and his hands moved to grip tightly
at Sam’s hips, trying to force him down onto his cock. "God, you taste so good.
I want to shove my tongue so deep in your ass and lick until you're clean."
Sam laughed and reached behind himself to gather just a little more. "Maybe
another time, alpha," he murmured and slid the fingers back into Dean's mouth.
"We need to get that knot to pop soon or you're going to hurt even worse."
While Dean's eyes were closed, enjoying the taste of slick, Sam let himself be
pushed onto the head of his cock, sinking halfway down.
Dean's eyes clamped tighter shut and Sam pushed the rest of the way down with a
long moan until he was fully seated. He knew it was going to feel good, but
this was more than he’d bargained for. The boy below him bucked his hips,
trying to get him to move, but Sam stayed still, leaning over to lightly brush
their lips together.
Hesitation, unsurety, was what he expected, but the kiss was met with fervor. A
hand laced into his hair, holding him in place as Dean's tongue snaked into his
mouth. Their breath was hot together as Dean licked over every inch of his
mouth, sucking in the taste of his omega. Sam didn't let their tongues play
against each other for much longer before he pulled back, resting their
foreheads together.
"I know your instinct is to fuck and take, but I want you to try and go slow,
ok?" Sam didn't wait for Dean's answer before he started to roll his hips,
causing the knot to slip in and out of his relaxed hole. Nails were digging
into his back as he kept up the constant, maddeningly-slow drag. Dean was
reduced to growls and moans, only stopping to place rough kisses to Sam's open,
panting mouth. He was so thick inside of him that every slow thrust back onto
the alpha's cock was rubbing against his prostate, causing more slick to fill
him.
"You feel so good inside me, alpha. I can feel your knot swelling." His voice
had gone breathy and his rhythm started to falter. Neither of them could hold
out for much longer, the slow pace making the sensations stronger than they
were. "You're so close already. Next time, I'll let you fuck me rough, alpha,
promise." He was going to warn Dean, but his orgasm hit him unexpectedly, his
hole clamping down tight around his alpha's knot, come striping both of their
stomachs white.
Even though he couldn't hear it over his own whines and whimpers, he could feel
Dean's breath hot on his cheek as he moaned. Dean's knot was expanding quickly
until it was locked inside of him, huge and likely aching. He was going to make
him feel so much better, though. "Sam, shit I'm going to—nnng, oh god—fuck,
fuck!" He ground his knot inside Sam and the omega's needy hole milked his cock
until he came hard.
Sam could feel come splashing hot inside of him, filling him up so good, and he
couldn't help pulling back and watching his alpha little brother's face as he
had his first knotted orgasm. His eyes were hooded, mouth open wide, face
twisted in intense pleasure. He kept grinding his hips up into his omega and as
he was starting to settle, Sam purposefully clenched around his knot, setting
off his second orgasm and letting more come seep into his drenched hole.
Dean was screaming and clinging to him as Sam milked three, four, and five out
of him. The look on his face—eyes wide and lips bitten red—revealed that he
hadn’t known alpha’s could come more than once. Sam had to commit that face to
memory because it was one of the hottest things he had ever seen before. After
Dean came down from the fifth one, they both collapsed. He managed to roll them
onto their sides, so that his larger frame wasn't crushing the small alpha.
They were face to face, tied together for a while at least. He expected this
part to be awkward; when the intensity of Dean's rut was wearing off and he
might be questioning why he let this happen. However, he was pleased when Dean
pulled him into his arms, bodies pressed as close as they could be at all
points, and kissed him languidly. Sam could feel the smile on his brother's
lips, and now confident that this was ok with him, returned the affection.
They still hadn't stopped kissing by the time Dean's knot went down.
End Notes
     Come hang out with me on Tumblr, I promise I don't bite:
     SPN NSFW Multi-ship sideblog: wingedwincest.tumblr.com
     Main blog: castielsstarr.tumblr.com
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