Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/5211164.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Supernatural
  Relationship:
      Dean_Winchester/Sam_Winchester
  Character:
      Sam_Winchester, Dean_Winchester, John_Winchester
  Additional Tags:
      Alpha/Beta/Omega_Dynamics, Omega_Sam, Alpha_Dean
  Stats:
      Published: 2015-11-14 Words: 3081
****** Calling It True Love ******
by Rebldomakr
Summary
     Sam couldn't say he hated being an Omega. He hated how feminine his
     body looked compared to his brother, hated how he was so short
     because 'Omegas typically do not grow during their first years of
     maturity'. But, he loved the attention his brother dumped on him like
     water and how his father stopped complaining when he wanted to coil
     around Dean. He hated how he got tired of school because of the
     Omega-special classes were too easy, so easy he just pleaded to stop
     being registered. He loved being able to spend all the time he wanted
     at the library, reading whatever he wanted and being able to learn at
     whatever speed he wanted.
     Then he's suddenly fourteen, and his first heat hits.
Notes
See the end of the work for notes
Sam remembered when he was nine years old. He was sleeping in their latest
motel room, covered in a thick quilt on top of his brother because it was cold
and the heater stopped working. School was out since it was Christmas vacation
and John was taking advantage of it, shipping them place to place within every
three days under the guise of a family vacation around the states. He was warm
and comfortable and happy because he had his big brother Dean, his big brother
who couldn't leave him somewhere to go out on a date with a girl or to do
something that he couldn't- didn't want to- bring his baby brother along with.
They were together, stuck together really, so he was happy.
Then he remembered waking up sometime in the middle of the night. Dean's arms
were tight around him, his face shoved into his neck, breathing heavily and
murmuring soft little words. The next morning dad came back and he learned he
wasn't an Alpha like his brother and his father. He was an Omega, like his
deceased mother. Immediately after when they went to the nearest diner for
breakfast, John and Dean made him eat three servings and he ate so much his
stomach hurt but there was this weird veil of happiness around him. His dad let
him cuddle against Dean, face buried in Dean's chests while being carried out
of the diner. No one looked twice because it was normal for a young Omega to be
clingy to their family whenever they were in a place full of people they didn't
know.
Being an Omega wasn't bad. Not as bad as being an Alpha, Sam thought. He
remembered Dean locking himself up in a bathroom, screaming and shouting and
coming home with other people's blood on his fists. He remembered that first
few years until Dean calmed down a bit, their father stressing down at Dean to
stop picking random fights and to push his anger and energy into hunting or
making money for them to live off of. Dean's hugs began to be tighter and they
hurt, but Sam knew Dean's tears and panic when he first saw that he gave Sam a
bruise so he never said anything. Over time he adjusted to Dean's tight hugs
and strength, of what was pain and discomfort becoming something that helped
him sleep better at night.
At school he was entered into those special Omega classes. They were easy,
lessons dull and lame and never lasting very long. He couldn't say he didn't
understand why. He fell asleep more often than not during classes, and his
classmates had trouble concentrating sometimes. It was what they were. It was
hard to spend hours a day in a school, he could only imagine how much harder it
was for Alphas and he suddenly understood why Dean got into so many fights.
Betas and Omegas and Alphas were separated, unless they were in a very small
town and let them mix some to fill up classes better. Betas, the constant
majority, were the only people not having any issues. But still, the classes
were easy and eventually he begged his dad to stop enrolling him so he could
just learn by books from the library. John gave in, but in return he'd have to
make sure to tell John about every new thing he learned every day.
He was pretty okay with being an Omega for a long time. Until he got his first
glance in a large mirror in a motel bathroom. At the age of eleven his body was
beginning to really push fat into certain areas. His hips were beginning to
round off and when he touched his butt, it jiggled. Boy butts weren't supposed
to do that! Dean's didn't do that, he knew that much, and he ran in place he
ended up crying about how much his body seemed to freaking jiggle. He ran out
crying and it took Dean an hour of comfort to calm him down.
"Baby boy it's okay." Dean had soothed. "It's okay, okay? You're an Omega,
baby, not an Alpha. We're muscle and you're fat."
"I'm not fat." Sam shoved Dean. "I don't wanna jiggle! It's gross!"
Dean laughed and had to explain to him that the reason why Omegas packed up
weight like they did was because it was from years of evolution, gearing them
to be attractive for Alphas, who liked it when their Omegas 'jiggled', though
he said it sounds better when you say 'bounced'.
"Do you like Omegas like that?" Sam asked.
His brother's cheeks turned red, but he answered. "Yeah, I do." And for
whatever reason that made Sam feel so much better.
A bit more time passed. Sam wasn't so sure he liked his body, but Dean always
told him that Alphas liked bodies like he had. He was still so, so short and he
hated that but, again, Dean told him Omegas never really got that tall until
after they got their first heat.
Sam was twelve when his body started to produce slick, random days that he
didn't want to move from bed. Sometimes Dean would let him sit on his lap, lay
his head on his chest and wait for that weird ache in the lower half of his
body to go away. Eventually, every few months, blood kicked in and if that
didn't make him think he was going to die it definitely made him pissed when
Dean started laughing his ass off when he told him. It was probably one of the
most embarrassing days of his life, and it was even worse when John nervously
slid a weird package across the motel table and when Dean taught him how
to use them. So, yeah, he felt like he was dying slowly and painfully.
A few months after his fourteenth birthday Sam had hit a growth spurt and he
went from 4'5 to 5'1 within a short period of time. He was waiting anxiously
for the day his first heat was going to hit. It was coming and his brother and
father knew it. He still examined his body every day after a shower, poking his
fleshy parts and wondering if they'd ever stop looking so gross to him. He
tried not eating as much, once, but then Dean held him down and forced him to
eat until he promised he'd eat as he's supposed to. And, yeah okay, it wasn't
as though he didn't have his flat stomach or anything like some Omegas because
the training that was still pushed for him to complete every morning.
His first heat hit when he was waiting for Dean to come back from his job as a
bar tender. Their dad was off on a hurt a few dozen miles away.
Heats weren't like how they said they were in books. It felt like relentless
burning, pain shooting up and down his body and Sam cried. He felt slick
running down his thighs in thick strips, the biggest amount of pain stinging
around his thighs and around his...area. It probably went on for a good hour
until Dean got home. He guessed he looked like a total mess, tears running down
his cheeks as he tried desperately to release the tension and pain in his body.
"Baby boy?" Dean asked cautiously, closing and locking the door behind him.
Sam whimpered. He wanted to speak, to beg Dean to make the pain stop because if
anyone could it'd be Dean, but he couldn't get his voice to work right. All
that came out was mewls and soft cries. He took in breathe and smelt Dean's
warm, coaxing scent that his brain recognized as 'Alpha'. His brain was
beginning to cloud over, common sense slowly draining out. The closer his
brother got to him, the less and less he thought about maintaining his chastity
and the more he spread his legs and the more he wanted to beg for Dean to
do something.
"It's okay." Dean said, sitting down next to him. He placed a heavy hand on
Sam's forehead, rubbing his hair out of the way with his thumb. "What do you
need?"
He gasped for air, reaching out and wrapping his arms around Dean's neck. He
bit out a few words. "Hurts. Please." He begged, tightening his grip around
him. "Please. Please." He repeated, voice raspy and it didn't sound like him at
all. The haze was officially settled in his head, Dean's scent wrapping around
him like a tight blanket. The pain in his body lessened and was completely
replaced by a light burn, tingly and sensitive but still bordering on painful.
"Sshh." Dean kissed Sam's neck. He moved his arms around, picking Sam up high
enough to slide underneath him. He let Sam collapse on top him, pushing up
against his body. "Where does it hurt the most?"
Sam stuck his butt as much as he could, whining loudly and spreading his legs
as far as he could. "Please." He repeated, again.
"Okay, baby, I got you." Dean said. He moved one hand down Sam's back, pushing
underneath his underwear as he kicked his pants off earlier. His hand groped
him tightly, but it didn't hurt. The gentle burn shot away from painful to
downright amazing. It was like drinking ecstasy.
He moaned softly, grinding down on Dean and praying that some of him would rub
off on him. Dean kissed his forehead, slipping in another hand.
Dean's hands groped and pulled. Sam felt thick streams of slick bursting free
and he heard his brother curse. Hands re-positioned themselves, moving closer
while still pulling and giving slick easy access out. Two fingers entered him
simultaneously.
"Fuck." Dean groaned, head falling back and hitting the headboard.
Sam was in wonderland. His body hummed, his brother's fingers feeling just so
amazing he wanted to scream that it wasn't moving or bigger. He moaned out, a
lot louder than last time. He panted heavily and pushed back up against Dean's
fingers. "More. More." He said.
"I got you." Dean promised.
The two fingers in his pushed in and out, pulling his hole- god that sounded
dirty to think about- open and letting the slick fall open. Each finger rubbed
against on opposite sides and it awakened amazing pleasure. Sam moaned louder
and louder, begging for more between every moan. Dean answered, first by
removing his two separate fingers and pushing in three fingers from his right
hand in.
Sam gasped, burying his head in Dean's neck as he came. He had masturbated
before but it felt nothing like this. He didn't think there was any way to
describe the pleasure running through his body. No way to explain why he hard
again right after, grinding down on the hardness in Dean's lap even as four-
when did Dean push in another?- fingers were pumping in and out of him.
Hours later Sam was asleep, spent with slick still pooling around him. Dean had
come twice in his jeans before finally getting naked, letting Sam do whatever
he wanted with his body but always stopping the line when Sam tried rubbing his
dick anywhere higher than the thighs.
Dean kissed Sam softly on the cheek, trying to ignore the burning guilt in his
chest for taking advantage of his brother. It was common knowledge that
siblings helped their Omega brothers and sisters during their heats, but it
didn't make him feel any less horrible. They gave them massages and talked to
them, they didn't get naked and finger them and let their dick get sucked off.
He was hoped John would get home and punch him so he wouldn't have to do it
himself.
===============================================================================
 
For six days Sam's heat ran like a sexual fever, only stopping when he was
asleep. When he was too tired to move but not tired enough to sleep, he spread
his legs and let Dean go to town on him. Dean cooed dirty words into his ears,
transferring them over to his vocabulary so when he was able to talk beyond
just make noises he used them. He begged and begged, his mind vanishing for an
entire day where he mindlessly begged for Dean's cock and fucked himself on
table leg.
John did come back at some point while Sam was asleep, but he left with the
task of Dean taking care of Sam. He stopped by while Sam was knocked out,
handing over food and asking if he's doing okay. He was way too approving of
what was going than what he should've been.
On the seventh day, Sam woke up with the burning sensation almost gone and his
memories of the past week covered in mist. He remembered the pain then
pleasure, Dean's kisses and words, he remembered all of the things he did and
he ended up locking himself in the bathroom before Dean woke up. It took them
an hour to convince Sam to come out.
Eventually, Sam got clothes and went to take a shower leaving John and Dean
alone.
"Are you going to do it?" John asked, popping open a beer and sliding another
towards Dean.
"Do what?" Dean already knew the answer to his question, but he wanted to hear
his dad say it. He didn't reach for the beer, either. He still felt the sweat
and stickiness clinging to his body. He wasn't even wearing any underwear, just
a pair of jeans.
"Don't make me say it." John said, eyes narrowing. "Dean, I need you to tell
me. Heats aren't comfortable for Omegas whether they have someone helping or
not, and the sooner Sam doesn't have go through it alone, the better. You're
the only one I can trust to take care of him."
Dean looked over to the bathroom door. He could hear the shower running. He
liked the thought of having Sam under him, moaning and desperate for him,
filling him up in every way possible. He almost came twice in a row when Sam
sucked him off and swallowed his entire load down. It'd be even better when he
could do all those things to his brother when he wasn't drugged by nature. It
wasn't just a sexual thing- he loves Sam. He wanted to take care of him and
make him happy, but it made him sick to the stomach to imagine his brother
being with someone that wasn't him. It made him angry and it made him want to
kill that someone. He wondered if Sam remembered the time, just as he was
becoming an Alpha, he pushed his brother's ass against his dick until he came.
Sam went along with it, eager please and, God, how he ever thought his brother
was going to be anything but an Omega was beyond him.
"It's up to him." He decided, voice soft.
John nodded. "Good. I'm going to pack up my room next door and call Bobby. Talk
to Sam, okay? I'll give you guys two hours." He said, standing up with his beer
still in his hands. He left the motel room, leaving Dean alone.
Meanwhile, Sam was just getting out of the shower.
He stood in front of the large mirror, eyes running up and down his body. There
wasn't a single bite on his skin, but there were bruises. Around his waist
there was a bruise leftover from Dean's hands, little bruises up and down his
legs, too.
It was odd. He couldn't remember half of what had happened during his heat, he
didn't even know what day it was, but he was happy. He turned to the side and
touched his ass, where he clearly remembered trying to get Dean's dick through
on more than one occasion but every time he was stopped. Suddenly it's
roundness didn't bother him so much anymore. Turning back to his front, he ran
his hands down and touched his hips down pass his thighs. They didn't bother
him anymore, either. Every bad thought that came up even half-formed was
destroyed by the memory of Dean cooing praises and touching him.
Sam's never thought about his brother that way. Not even once. But now, he
couldn't stop imagining it. He wondered if it was the newly awakened Omega side
of him begging to go out to the motel room, get down on his hands and knees and
do everything Dean told him to do. He could only imagine what it'd be like if
they mated. He couldn't say he hated this new feeling of submissiveness, but he
wasn't so sure he liked it either.
Sam sighed. What was even the point of worrying? All of what happened was
probably nothing.
"Sam?" Dean called, knocking on the door. "Can I come in?"
He didn't even mean to say it, but he did. "Yes!" He called, then winced right
after. His chest boiled uneasily at his brain's thought of saying no.
Dean pushed the door open, stepping in shirtless and Sam had to gulp down a
ball in his throat. "Sam?" He asked softly, eyes reaching out for approval.
And Sam couldn't help but give it to him. "What's up?" He asked, fingers coming
up and fidgeting.
"Do..." Dean began. "Did you like what I did?"
Sam blushed, and nodded.
"I...I was wondering if..." Dean coughed into his fist.
"Are you...?" Sam's eyes widened. His entire body hummed and begged for him to
say yes. His brain pushed forward his memories of Dean, beyond that just the
last week and all of the instances Dean cared for him and helped him. A memory
of back when he was too young to understand, grinding down on his brother
because Dean seemed to need that help. A memory of Dean making him chocolate
chip pancakes, a memory of him not eating for days at a time so that Sam could
get something to fill his stomach.
Dean looked at him.
Sam blushed. "I...I would like that." He said. He couldn't determine if it was
just that sudden, new part of him saying that or if it wasn't actually him, but
he liked the thought of belonging to Dean. His brother would never hurt him,
never intentionally, and that's a lot more than any Alpha could ever offer him.
In his response to Sam's approval, Dean pulled his brother close and pushed his
lips against Sam's. 
End Notes
     Sorry if there's any mistakes! The story is unbeta'ed and I probably
     wrote this within a few hours. I wrote this after days of an
     Omega!Sam brewed in my head and I just had to do something with it.
     Hope you enjoyed it, write a comment or leave a kudos if you did
     please!
     Thanks for reading!
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