Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/4644360.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Merlin_(TV)
  Relationship:
      Merlin/Arthur_Pendragon, Uther/Multiple, Merlin/Arthur_Pendragon_(Merlin)
  Character:
      Merlin_(Merlin), Arthur_Pendragon_(Merlin)
  Additional Tags:
      Incest, Half-Sibling_Incest, Knotting, Omega_Verse, Alpha/Beta/Omega
      Dynamics, Alpha_Arthur, Omega_Merlin, Dubious_Consent, Mating_Cycles/In
      Heat, Underage_Sex, Smut
  Collections:
      Kink_Me_Merlin_Non-anonymous_Fills
  Stats:
      Published: 2015-08-24 Updated: 2015-12-13 Chapters: 5/? Words: 6801
****** Why Fight Nature? ******
by Kateri
Summary
     Arthur is an Alpha but is not allowed near the Omegas that live on
     the estate, his father's lovers and his half siblings. As he prepares
     to leave for University though all he can think about is whether he
     will have a chance to finally knot an omega while there. An
     unexpected gift though is dropped in his lap and why should Arthur
     fight nature when they both need this?
Notes
     Dub-Con due to Heat and underage sex.
     A/B/O verse where an Alpha, Beta, or Omega can only be born if one of
     their parents is. A/B only produce alphas and betas, B/O only produce
     betas and omegas and so on. Mating instincts/desires and social
     morals are very different.
     Written for the prompt "Anything involving a/o and incest. Maybe it
     was believed blood ties over rode mating instinct, maybe it was
     deemed impossible for parents to give birth to both an alpha and
     omega child, or maybe everyone tried to keep Arthur and Merlin apart
     once they came of age. "
***** To Knot Obey Instinct Would Be Folly *****
Back in the days of kings and nobles ruling over the land Omegas were
considered to be the property of kings. Only the royal family and those they
gave permission too could wed and knot them. Later as humanity understood
genetics and inheritance better it slowly became more acceptable for the common
man to marry Omegas. An Alpha and Omega pairing still tended to remain in the
sphere of the wealthy and influential though due to the need to be able to
maintain separate households for their Alpha and Omega children. As society
changed, morals concerning Alpha and Omegas did as well and most ignored their
biological needs and settled down with a Beta.
Arthur lay bored on the couch in his father’s manor house cursing his wealthy
and noble ancestors in general and his randy Omega loving father in general.
Most Alphas never knotted an Omega and if they did they satisfied themselves
with a few rolls in the metaphorical hay with an Omega on contraceptives before
settling down with a nice Beta spouse and popping out 2.5 kids to live with a
dog and picket fence. Not Uther Pendragon though. Such a mundane existence was
beneath him and there was no way that he would give up Omegas or risk have a
Beta heir. No Uther Pendragon married a young socialite Omega, knotted and
breed the Omega wives of friends, took on young Omegas as lovers who lived in
multiple households on his family estate and even impregnated the Omega nanny
he had hired to care for his young children and older Omega after his wife’s
passing.
So Arthur Pendragon, the only legitimate Alpha heir of his father, was
consigned to living with his father, half-brother Kay and the half-sister of
his half-sister Morgause in the manor house while two households full of
Omegas, most of them half-siblings of Arthur, lived on the estate but were off
limits. Sometimes Arthur wished he was like most of the other Alpha students at
his school, with beta and alpha siblings, whose closest encounter with an Omega
was standing outside the local Omega boarding school and sneakily talking to
students through the wrought iron fence. Instead Arthur had to contend with
sitting across the dinner table from Omegas twice a month during family dinners
and smelling the scent of an Omega in heat wafting across the property from the
Omega house that he was not allowed to enter.
Ever since he had popped his knot and made it obvious that he was an Alpha
Arthur had ached to burry it in an Omega. Not satisfied with fucking beta girls
or watching fake Omega porn like his friends Arthur would sneak out when one of
Uther’s Omegas were in heat and get as close to the building as possible and
listen to their screams as they begged for Uther’s knot.
Uther ran a tight household with all of his children, plus Morgause, living in
the Nursery House at first, cared for by Hunith Emrys and occasionally the
mothers of the children when they were still young. The children were only
allowed to stay there though until the Alphas were identified at the beginning
of puberty when their knot began to grow and they were moved into the manor
house with Uther. The Omegas remained until their first heat positively
identified them and then moved into the Omega house, the domain of Nynieve and
Nimueh currently but many Omegas had resided there over the years and not all
had given Uther children.
Arthur had presented at thirteen and moved into the Manor house, roughly the
same age that Morgause and Kay had. Most of his Omega siblings had gone into
their first heat at around fifteen, sometimes fourteen. None had left home yet
so all five, Morgana, Elaine, Madoc, Ninianne, and Freya, lived there still.
Currently Hunith only had three children in residence, young Nynieve’s son
Guivret, Vivianne’s youngest Mordred and Hunith’s son Merlin.
Arthur only occasionally visited the Nursery House’s large porch but was never
allowed entrance and since Merlin and Mordred were both thirteen they would
most likely be moving soon. Arthur sincerely hoped that Mordred did not present
as an Alpha, he found him more than a bit creepy, but apparently much beloved
by his older sisters. Merlin on the other hand was an okay kid, easily
embarrassed at times but very plucky and willing to stand up against those
bigger and older than him for what he thought was right. It was all of the
fights in and after school that had Uther preparing another room in the Manor,
sure that his only child by Hunith would turn out an Alpha. Considering how
willing some of his Omega siblings were to yell at their father Arthur wasn’t
so sure that Merlin’s willingness to argue was so much an Alpha trait as such,
more a Pendragon trait but would agree that Merlin appeared to be maturing at
an Alpha rate.
Rubbing his dick lightly through his jeans Arthur tried not to dwell on the
forbidden Omegas living only a few hundred yards from him and instead on the
possibilities that would be open to him in just a few days when he moved into
his place for University. A coed institution, Avalon enrolled all sexes and
genders. Most Omegas still lived in group houses and tool suppressors and
contraceptives which meant that they would not got into Heat or be able to
conceive but could be seduced or caught breaking curfew at a late night party
or club. Arthur could almost picture it, a nubile young Omega, male possibly,
pressed against a wall in a dark corner, begging him to fill him up. As he
pressed harder on his trapped cock Arthur could practically smell the scent of
Omega in heat.
Taking a deep breath through his nose Arthur suddenly bolted off the couch as
he heard a sob and realized that he actually was smelling an Omega in heat.
Panting and red faced Merlin stood in the doorway, his glazed eyes lazily
sliding past Arthur before darting back to the blond and clearing slightly.
“Arthur,” Merlin gasped with a sob in his tone, “Something’s wrong, it hurts
and won’t stop.”
Arthur found himself unable to reply, struck silent by the sight in front of
him. His thirteen year old brother stood in the door way smelling of Heat and
dressed in a bathrobe, t-shirt, and boxers, said boxers soaked from where fluid
dripped down his legs still plump with what before today Arthur had assumed was
baby fat and his cock peeping out of the slit, an angry red color and leaking
from the tip.
“No matter how much I wank it won’t stop, make it stop Arthur,” Merlin sobbed,
his hand sliding into his boxers and tugging at his cock, causing the smell of
Omega to flood the room.
“Don’t worry Baby Bird, I’ll help you,” Arthur found himself saying, his groin
tightening in anticipation. “Where’s your mom and Mordred?”
“Mordred’s mum picked him up for a week, and mum is in Scotland and won’t be
back for days because she is at the hospital with Uncle Gaius,” Merlin
answered, his bottom lip quivering “I’m all alone at the house because Nynieve
took ‘Ret to stay with her and don’t know what to do Arthur.”
Arthur licked his lips, weighing the odds. He could walk Merlin over to the
Omega house and let someone there handle Merlin but if Hunith was at the
hospital with her Uncle than she wouldn’t be able to check on Merlin herself
for days probably, a call that he was staying in the manor would take care of
her. Morgause and Kay had left yesterday for school, his father was on a
business trip to Tokyo, and none of the servants were scheduled to stop by
before he was supposed to leave for Avalon. None of the residents of the Omega
House ever came to the Manor unless his father ordered it, so there was no one
that could stumble upon them and stop him.
“Don’t worry Baby Bird, I know just what to do.” Arthur answered taking a step
toward Merlin in anticipation.
Uther had children by five different Omegas, it was his fault, Arthur thought
as he reached out to take Merlin’s hand and lead him up the stairs. It was
cruel to father so many sweet little omegas and deny them Alpha knots when they
needed them, just as it was wrong to deny Arthur the chance knot an omega.
Besides, his little Baby Bird was his favorite sibling and he couldn’t let him
suffer.
696969696969
Arthur quickly led Merlin up the stairs to him room, a place that Merlin had
never been before and as an Omega should never be. Arthur refused not to take
advantage of what was being handed to him practically gift wrapped though. Even
today most Alphas never got to knot an Omega, much less one in Heat. The Omegas
willing to go through their Heats instead of chemically suppressing them until
marriage tended to be snapped up by people like his father as live in
mistresses. Arthur had no intention of waiting until marriage to experience
what fucking and knotting an Omega was like.
Locking the door behind them despite the empty house Arthur paused to take in
Merlin. The Omega was flushed and was rubbing his erection through his boxers.
In recent months Arthur had thought Merlin had started bulking up some, leaving
his slenderness behind with the exception of his legs. Merlin’s thighs had
always retained a hint of the chunky toddler he had been. How true this was
Arthur didn’t know as Merlin had not joined him in the pool all summer and had
taken to wearing several layers of shirts. Now he wanted nothing more than to
see the changes that had obviously been happening that Merlin seemed to have
been hiding.
Striding across the room to his bed Arthur took a seat before calling Merlin
over.
“Come on over here Little Bird so I can help you,”
“Not little anymore,” Merlin mumbled as he stumbled over until he stood glassy
eyed in front of Arthur.
“Let’s get all these uncomfortable and hot clothes off so I can take good care
of you Merlin,” Arthur said “and you will always be MY Little Bird, my little
hawk. After all I’m the one that chose your name.”
Arthur’s hands shook as he removed an uncomplaining Merlin’s cloths. First the
bathrobe slid off of his shoulders and then he peeled the t-shirt up over
Merlin’s head and finally slid the boxers down over Merlin’s hips revealing the
sweet young omega’s body.
Though Merlin was young and this was his first Heat Arthur was surprised at how
much the revealed Omega’s body had changed from when he had run around last
summer in swim trunks. Merlin’s hips had already thickened and spread, showing
that while he might only be thirteen his body was mature and ready to carry
young. His waist was slender, but not too slender and led to the most perfect
chest. It was a mixture of masculine and feminine that had Arthur wanting to
take the small breasts into his mouth and suck them until Merlin screamed in
pain. God they were gorgeous with stiff little rosy nipples that begged to be
bitten. His shoulders were broad, his legs long, and his cheekbones sharp.
Now that he was naked Arthur couldn’t believe that no one had realized that
Merlin had developed into an Omega, especially one that appeared to have
matured so far before his first Heat. A male Omega’s body did not normally
start to develop any of the characteristics necessary for carrying a child
until their first Heat flooded their body with hormones triggering the changes
that had already happened to Merlin. As much as he wanted to look though
Arthur’s desire to fuck his knot into the wet heat of the little Omega was
greater and he would have plenty of time later to explore.
“Alright Merlin are you ready for me to help you?” Arthur asked, barely
restraining himself from just tossing him onto the bed and instead settled a
hand on Merlin’s hip, aching to grab what he was sure was a luscious ass.
“You can make it stop right Arthur?” Merlin asked, his hands fluttering about
as if unsure what to do with them as he stood naked in front of his brother.
“Yes I can, but you need to get up on the bed, face down so that I can give you
what you need.” Arthur said.
Quickly Merlin complied, lying face down on Arthur’s bed, his legs
unconsciously falling open and exposing his leaking hole to Arthur.
Quickly stripping out of his own clothes Arthur climbed onto the bed behind
Merlin and gripped one of his ankles. He smiled as he felt how hot the
trembling limb was.
“Don’t worry Merlin, I know just what you need.” Arthur said as he ran his hand
up and down Merlin’s leg. “I know how to get rid of the emptiness and hurt.”
As his hand reached Merlin’s thighs his rear made a tiny thrust backward and a
gush of slick made its way out of his ready hole.
“Are you hot Merlin?” Arthur asked feeling excited and commanding “Are you
burning up inside?”
“Hurts Arthur, too hot and empty,” Merlin whimpered “Make it stop, fix it
please.”
“There’s only one way to help you Little Bird, you need something to fill you
up. You need something stuffed up here.” Arthur said as he slipped a finger
into the wet loose hole and groaned as Merlin shoved his ass back and
whimpered.
“But not just anything will help Merlin, do you know why?” Arthur asked as he
worked his finger in and out of Merlin’s leaking Omega boy cunt. “Only an Alpha
knot will make it better because you’re an Omega. Your cunt knew what you
needed, that’s why you came to me, so I could stick my knot in you and make us
both feel good.”
He couldn’t wait any longer and couldn’t be bothered to take the time to make
sure that Merlin could take him, he had to get inside of his Heat crazed Omega
brother. He had to fuck him now.
“You like that Merlin? Does that feel good?” Arthur ground out as he grasped
Merlin’s legs behind the knees and pulled them and to the side of the prone
body, forcing Merlin’s legs to splay out to the side of his now slightly raised
ass.
“I’m going to fill you up and drown that fire in you Little Bird, I’m going to
fill you up.” Arthur said, panting with lust as he gave his now fully engorged
cock a few pulls and enjoyed the whimpers and breathy moans of the virgin Omega
whose cherry he was about to pop.
‘God!’ Arthur thought, ‘he was about to fuck and knot his favorite brother who
was in fucking heat and he was going to love every minute of it.’
Arthur quickly guided his cock in-between Merlin’s cheeks and teased his hole
twice before he pushed forward. It took a moment but as soon as the head of his
cock disappeared into the body of his brother Arthur grabbed one of Merlin’s
shoulders and used his grip to pull the body back onto his cock as he thrust
forward. The pleasure as his cock was engulfed by the fiery tightness of the
quivering omega was like nothing Arthur had felt before. With no thought he
pulled back and thrust back in again and again, changing his angle and grip,
looking for the perfect position to pound into the quivering and moan mess
beneath him.
Arthur couldn’t believe that he had had Omegas living so close to him all this
time and he had never fucked one. The tight heat clenching around his cock was
better than any beta pussy he had fucked and the heat scent pouring off of
Merlin was driving him wild. The moans and sobs coming from his little brother
were better than any dirty talk from any of the girls he had fucked. He felt
like a god as he fucked deeper and deeper into the small body, unable to
believe that it could take almost his entire cock again and again. The heat and
tightness gripping him was unbelievable and he quickly became lost in the
feeling of sinking into Merlin.
“Oh god you’re perfect,” Arthur panted “Just so fucking perfect, you were made
for fucking!”
“Arthur!!” Merlin wailed, his head turned to the side trying to look at his
brother who was busy fucking him.
“Yes! Arthur, your Alpha,” Arthur grunted, “God look at how well you take my
cock. I’ve stuffed it up so far in you and I’m gonna fuck that burning right
out of you. I’m gonna shove my knot in so deep that whenever I’m not inside
you, you are going to feel empty and loose!”
“Yes Alpha! Yes!” Merlin cried as his body shook as he came.
It was not enough though to calm the raging lust and need of his Heat and he
cried out for more, for something that he didn’t know but craved deeply.
After the second time Merlin clenched around him as the Omega came Arthur lost
all sense of anything but the need to go deeper, so deep that no one else would
ever reach it, that Merlin would never forget how completely Arthur owned him.
No matter what he could not sink as deep as his body craved until with one
harsh thrust Arthur lost his balance and ended up held off of Merlin only by
his elbows braced to either side of the sobbing Omega. Arthur spread his legs
wide and covered Merlin’s body entirely. Practically plastered to Merlin Arthur
was able to use the new position to at last slide the last inches of his cock
into his brother’s tight ass.
The new depth that Arthur reached was too much though. With only a few thrusts
Arthur found his knot swelling, locking him deep within Merlin. Between
Merlin’s cries at the growing size of the giant knot buried in him and the
pressure Arthur felt gripping his knot as he ground into the body beneath him
he was sure that at any moment his prick would tear the small omega apart.
Instead with a suddenness that had both of them gasping and trembling and
falling off a cliff into an ocean of pleasure Arthur came.
Arthur’s swollen and Rut enlarged bollocks began to empty as he cummed deep
inside Merlin, bathing his insides with cum. The sea of Alpha cum trapped by
Arthur’s knot momentarily calmed the fire that had been raging inside Merlin
allowing him to go limp beneath Arthur’s bulk in relief and pleasure. As he
continued to spend deep inside Merlin Arthur was sure it would never stop, that
he would continue to cum until Merlin’s belly grew distended and burst from
Arthur’s spunk.
***** Knot Letting Go *****
Chapter Summary
     Still tied to his brother Arthur is already ready to fuck him again.
Arthur was careful to not rest all his weight on the smaller body he was
currently tied to, his knot still swollen and lodged deep inside the sleepy
Omega. Even with how hurried it was that was the best sex he had ever had and
if that was what it was like with an Omega he couldn’t understand why any Alpha
would want to go back to betas. Being able to fit his whole knot inside that
raging heat alone made it better than anything he had felt before.
Slowly Arthur rolled them to their sides and curled himself around Merlin and
just enjoyed the feeling of his cock tied deep inside the Omega. Merlin’s body
was still clamped down and even if his knot went down Arthur wasn’t sure he
would be able to pull out. In some of the Heat Porn Arthur had watched the
Alphas had gotten hard again and fucked the Omegas without even pulling out but
some of his friends had claimed it was just porn and not real. The unrelenting
clasp of Merlin’s body was leading Arthur to think that it was entirely
possible that he would fuck Merlin again before his knot was released.
Curious Arthur began to move his hips slightly, feeling his knot catch and pull
on Merlin caused delightful sensations. After several minutes though Arthur
grew tired of this and began to grind into the limp body. This felt even better
and soon Arthur was clutching at Merlin’s hips to pull him closer as he ground
his groin into his brother in a circular motion. About the time that Merlin
began to emit small sleepy moans Arthur was once again erect and was overcome
by the desire to rut. Rolling the pair of them over so Merlin was belly down on
the bed with Arthur covering him and his hips thrusting against Merlin causing
his knot to rub continuously against Merlin’s prostate.
Arthur didn’t know how long he thrust his trapped cock deeper into Merlin
before he realized that his brother was awake and sobbing and clawing at the
bed. Delighted that he had caused this Arthur found his body freezing up as he
came and cummed deep inside Merlin again. After what felt like forever as
spurts of cum still jetted out of his cock into Merlin Arthur became aware of
Merlin’s hips trying to move and quiet sobs.
“Please Alpha, make me come,” Merlin begged through tears of frustration
“Please I need to,”
Considering he had already gotten two great orgasms out of Merlin and he had
promised to take care of him Arthur reached under Merlin and wrapped his arms
around him. Pulling his own knees under him Arthur then hoisted Merlin up as he
sat up himself and settled back into a kneeling position with Merlin seated on
his folded lets, still tied to him. Using one arm to secure Merlin to his chest
Arthur grasped Merlin roughly with his free hand and began to stroke him
roughly while he buried his face in his brother’s pale neck. Only slightly
distracted by the need to keep his arm moving Arthur gave himself free rein to
lick, bit and suck at the delicate neck beneath his lips. Just as Merlin
shuddered and came the convulsions of his inner muscles wrung another small
flood of spunk from Arthur and caused the Alpha to bite down on Merlin’s
shoulder hard enough to bruise.
Both of them satisfied for the moment Arthur carefully arranged them before
closing his eyes for just a moment.
***** Knot Ignoring His Desires *****
Chapter Summary
     Merlin's Heat continues and Arthur is determined to have the Omega
     any way he wants while he can.
Arthur found himself jolted awake as his half hard cock was roughly stroked and
tugged at. Seeing a flushed Merlin leaning over his groin, desperately trying
to bring him to full mast had the day rushing back to Arthur. Unable to believe
that he had fallen asleep, Arthur none the less felt invigorated and aroused,
like he could fuck all day long now. Sitting up he grabbed Merlin by the
shoulders and pushed the much smaller boy backwards. Ignoring his wines of
outrage and the begging words Arthur climbed on top of him, straddling his
chest.
Licking his lips Arthur took his half hard cock and rubbed the tip of it
against Merlin’s lips. When the boy opened them to let out a surprised gasp
Arthur quickly fed it into his hot mouth. Watching his cock slip between those
sinful lips had Arthur groaning and trying to force more of it into the moist
cavern.
“Come on Merlin, just a little bit more,” Arthur said already hardening more.
“Just suck at it, use your tongue.”
At the tentative suck and swipe of Merlin’s tongue Arthur groaned and thrust
forward uncaring of whether or not Merlin could take him. As the Omega began to
suck harder Arthur continued to make small thrusts until the depth he could
reach wasn’t enough. Reaching down he grasped Merlin’s head and pulled it up,
allowing him to thrust deeper and causing the pinned omega to start to squirm.
A part of Arthur wondered if he was choking the boy but the feeling of those
lips around his cock meant that he didn’t care, he needed more of his cock to
slip past them. God the control he felt, forcing his cock between those lips,
the sight of saliva dripping out the sides of Merlin’s mouth was almost as good
as the sensation of his cock sliding in and out. Pulling out momentarily Arthur
ignored Merlin’s gasps for air and ran his cock head over the boy’s face,
painting it messily. Soon enough he forced it back between the omega’s
reluctant lips and began facefucking him vigorously, holding Merlin’s head
firmly between his hands.
Arthur wasn’t sure how long he did this before he tired of the sensation and
wanted more. As good as his mouth was Arthur wanted to get his knot lodged in
Merlin’s sweet young omega ass again. Arthur had no idea how long it would be
until he had another chance at barebacking someone, much less an omega and was
going dump as much cum as he could inside Merlin during his heat while he
could.
Pulling out of Merlin’s slack mouth Arthur climbed off of the smaller boy and
grabbed him to maneuver his Heat slicked body into the position he wanted.
 
“Arthur, please!” Merlin begged as he was manhandled “I’m hot.”
“Don’t you worry Little Bird,” Arthur said to the boy on his back as he pushed
his knees up toward his sweat slicked chest, bending the Omega almost in two,
“I’m gonna stick my cock back in your hot little hole and make the heat go
away.”
“Arthur,” Merlin wined one hand grasping at Arthur while the other tried to
grab his own erect little cock, the head purple with its need to come.
“Shhh….” Arthur replied reaching to stroke Merlin’s hair, “It felt real good
when I did this before, remember? A big Alpha cock and knot in your little
omega cunt is what you need to make the heat go away.”
Not wanting to wait any longer Arthur grasped his throbbing cock and placed it
at Merlin’s slick entrance and watched as it sank in. Pulling back slightly
before pushing in even farther Arthur marveled at the stretch of the small hole
around him, both welcoming the fleshy rod and trying to expel it.
The deeper Arthur sank the louder and more insistent Merlin’s groans and
begging became. Tiring of the slow pace Arthur shuffled closer to Merlin and
pushed his knees to the side so that when he leaned over he could suck the
boy’s tits. With his mouth occupied Arthur began moving his hips faster, his
thrusts becoming deep and rapid, pounding into the bent body beneath his.
Merlin’s groans became screams of pleasure as Arthur plunged deeper and deeper
into his body until at last Arthur found his hips unconsciously grinding him
into the ‘V’ of Merlin’s legs as his fully sheathed cock began to swell at his
knot before he cummed deep inside the sobbing omega.
Hunched over the trembling body Arthur tried to thrust deeper as he spilled
inside Merlin’s hot body, quenching the Heat fires momentarily. The pressure
from Arthur’s knot on his prostate had the omega coming again and again,
clenching around the flesh that impaled him and leaving his own spunk to
decorate his quivering stomach. Despite his orgasm Arthur wasn’t satisfied and
his trapped cock remained diamond hard in its fleshy prison.
With a few movements Arthur worked his knees partially under Merlin’s back,
leaving his bum and lower back to rest on Arthur’s thighs. Still bent over the
small body Arthur reached under Merlin’s arms to grasp his shoulders and pull
his body farther onto his cock as he continued to grind his hips into Merlin in
a circular motion. The feeling of his knot shifting within the small Omega was
fantastic and the constant small shudders that ran through his small frame felt
delicious as they danced up and down his sheathed cock.
Finding his face buried in Merlin’s neck Arthur began to suck and bite at the
flesh beneath his lips, leaving mark after mark on the pale skin. By the time
Arthur was done with him it was going to be obvious to anyone who looked at the
boy that he had been thoroughly violated and had by an Alpha. Arthur was
determined that by the end of his heat not one portion of Merlin’s body would
remain unclaimed.
Arthur didn’t know how long he maintained his motion but his second orgasm
caught him by surprise as he once again shot wave after wave of cum deep inside
Merlin, who let out a sigh of relief as his insides were soothed once again
momentarily. This time he softened and his knot went down fairly quickly so
that he was able to withdraw. The sight of his own spunk mixed with Merlin’s
omega slick leaking from his brother’s wrecked hole caused Arthur’s prick to
twitch but even an Alpha need some recovery time. Soon enough Merlin would be
begging again for Arthur to fuck and in the mean time he could begin to explore
the omega’s body.
***** Knot Ever Giving Up What Is Mine *****
Chapter Summary
     Arthur considers the future.
Chapter Notes
     Okay, somehow Arthur got away from me and what I planned and turned
     out to be an even bigger perv than I intended. Just a warning that
     the incest tag is really deserved.
While Merlin lay in a satisfied daze Arthur took the time to run his hands all
over the young body that lay next to his and explore it completely. He paid
special attention to the fat little omega cock, temporarily limp and the still
leaking hole all glistening and pink from taking Arthur’s cock. Arthur saved
the best for last though, the two perfect mounds of flesh on Merlin’s chest.
Arthur liked breasts just like any teenage boy but he had never been as drawn
to a pair as much as he was Merlin’s. The small soft mounds were perfect in
either his hand or his mouth and he used both. Taking the left one in his mouth
Arthur began to suck on it, letting it go occasionally to let his mouth wander
all over the pale flesh biting and licking it. Busy as he was he did not
neglect Merlin’s other tit, making sure to kneed and squeeze it, even pinching
at the rosy teat already pointed with arousal.
Eventually Merlin’s tits could not distract Arthur from other needs and he left
the sleeping Omega to take care of them. He returned quickly, refreshed and
fed, bringing with him a tray of snacks and juices that he slowly began to feed
to the groggy teen in his bed. The weight of Merlin leaning back against him as
he gently slipped food and drink between the Omega’s swollen lips was arousing,
as was the thought that the smaller boy would waste away if Arthur wasn’t here
to make sure he ate and drank instead of fucking his whole Heat away. These
actions made Arthur feel possessive and powerful and seeing that Merlin was
erect and leaking again Arthur decided to put the food aside and possess his
body once again.
Arthur rolled the still passive Omega onto his side and slid down the bed until
he rested behind him. Fingering his entrance Arthur found it loose and still
slick and leaking. Grasping Merlin’s right leg behind the knee Arthur pulled it
up until it was bent and pressed against Merlin’s upper body, exposing more of
his rear to the Alpha’s attention. Quickly lining his erection up Arthur pushed
into the tight heat and began a slow fuck into the still sleepy but aroused
omega.
Arthur grunted in exertion and pleasure as his cock continually sank into the
tight grip of Merlin’s body. With the smaller boy on his side with his top leg
pulled up to spread him out Arthur was able to comfortably thrust into the
pliant body and still play with his swollen breasts. Arthur found it harder and
harder to leave the small tits alone. They just felt so wonderful in his mouth
or hands and he couldn’t help but imagine them swollen to a much larger size,
filled with milk after delivering a babe or two. With Merlin’s still tiny size
and mostly slender build they would look enormous and would be sure to bounce
and jiggle with every movement of the omega.
Picturing how big Merlin’s tits could look in the future had Arthur spreading
Merlin even wider as he began to thrust harder and more urgently, determined to
knot the boy and tie them so he could fill him up with his spunk again. The
closer Arthur got to his peak the more aroused he felt at the thought of once
again spilling inside his brother.
The bonds of family already gave Arthur claim over the other boy, and knotting
him through his first heat meant that Arthur possessed the omega in a way no
one else ever would. A tiny growing thought though had Arthur fucking deeply
into Merlin though, nothing said possession quite like impregnating an omega.
While the laws no longer gave an Alpha rights over Omegas they had bred and the
Omegas were free to leave where would a pregnant teen go but with the Alpha
that had tied them? No thirteen year old could support himself and his child
without the help of his Alpha, and the more he was bred the closer the ties
would be.
Unable to contain his possessive feelings Arthur rolled the pair of them over
so that Merlin now lay on his stomach and could rub his own cock against the
bed beneath him. Fully awake now thanks to Arthur’s deep fucking the little
omega was pleading for Arthur’s knot and sperm to once again help quell the
fire he felt deep in his belly. It didn’t take long with the two of them
working in concert to orgasm explosively and for Arthur to fall upon Merlin’s
back as his knot tied him once again to the omega.
As Arthur spilled himself deep into the fertile body beneath him his earlier
thoughts came back to him. The first heat was supposed to be light as normally
an Omega’s body had not yet matured. Merlin though was sure to conceive with
his tight little mature body unlike most teen omegas. Arthur could fill him up
again and again and get him with child. He could take him with him and fuck him
as his belly swelled, and as soon as the baby was born and weaned he could send
it away to induce Merlin into Heat again. It was possible if Arthur fucked him
enough he might even be able to induce a Heat without sending the child away.
This thought warmed Arthur’s heart as he thought about it.
He would breed Merlin again and again and then all of them would live together
in one great big home. And he would not lock up his Omega offspring, no Merlin
would have all of them around him and when Arthur’s Omega children went into
heat he would let the Alphas taste them and help their brothers and sisters
through it just like Arthur helped Merlin.
And if there were no alpha children Arthur might knot their soft bodies himself
to relieve the fires in their bellies while Merlin watched and then take his
mate again and again until both Omegas had a belly full of his seed. Arthur
would have more children than his father but they would know they were loved
instead of being hid away.
“Do you know what’s happening to you Merlin?” Arthur asked the body pinned
beneath his own and full of his seed “Do you know what you are?”
Merlin started to nod before violently shaking his head.
“Don’t lie to me Merlin, you knew what was happening and you hid it.” Arthur
said sternly, desire to bend his stubborn little brother to his will running
deep through his veins.
“I can’t be an Omega,” Merlin sniffled “I can’t, I won’t be. I won’t live in
the Omega House with those harpies. Father can’t keep me from seeing you!”
Arthur smiled as Merlin cried and reached back to grasp at the body that still
pinned the omega’s to the bed, knotted and tied. Grinding into Merlin’s rear,
making the omega very aware of the knot pressing against his prostate Arthur
enjoyed Merlin’s gasps of arousal.
“But you are Merlin, you are an Omega. But you won’t be living with Father’s
pathetic house of broodmares and he won’t be stopping us from seeing each
other. I’m going to put a babe in you, I’m going to make you fat with my
children. I’m going to take you with me and you’re going to be my mate. I’ll
keep you in my bed and knot you every day. I’ll keep you so filled up with my
spunk that you’ll always be pregnant with a big belly an huge tits. I might
even get your mom to come stay with us after you have the first baby to take
care of it because you’ll be too busy begging for my knot.”
Arthur grinned as Merlin whined and began to shudder beneath him as he
orgasmed. Feeling his own cock twitch where it was still buried inside his mate
Arthur began to fuck him again as much as his still engorged knot would allow.
Arthur was determined to come at least one more time before his knot went down
this time. Merlin had two more days of Heat most likely and Arthur was
determined to enjoy it as much as possible.
***** Warming Up *****
Chapter Summary
     Yesterday Merlin's life began to spiral out of control
Merlin’s Side
Merlin didn’t quite understand what was happening to his body but it scared
him. He did his best to wear lots of shirts and baggy pants so no one could see
his body. Late at night though he couldn’t help but run his hands over his
growing hips and rub his sensitive nipples. What was happening to him was
nothing like what they talked about in his health classes, about how your body
might change as you grew older. The day after his mum left to go stay with her
Uncle Gaius was the scariest day yet.
When Merlin woke up that morning alone in the Nursery House he felt hot and
achy. Afraid that he might have a fever he didn’t bother dressing and ate some
breakfast and drank lots of water. The achy feeling never went away and when he
went to bed that night wondering if Arthur would let him come stay with him up
at the manor house tomorrow if he was still feeling sick. Merlin knew he wasn’t
supposed to go there until he became an Alpha but Father was gone and Merlin
loved spending time with Arthur. Soon he would be leaving for University and
Merlin wouldn’t see the only sibling that actually cared for him for months.
That night Merlin wanked five times, and was a bit worried about how sensitive
his cock felt and how it kept springing back up. He knew that Alpha’s had a lot
of sex but nothing else about his body was developing the way it should. The
fears that lingered in the shadows of his mind tried to creep forward but
Merlin steadfastly ignored them and instead thought of Arthur, his big strong
Alpha brother and how he would go to him tomorrow. Arthur would make everything
better.
When Merlin woke in the morning it was to find that his fever felt much higher
than before and he was laying in a giant wet spot. His boxers were encrusted
with his cum and something else that Merlin ignored with all his might. As the
morning passed the achy feeling from yesterday settled in his lower stomach and
between his legs. Now all Merlin could think about was the empty feeling inside
of him, almost like a hunger but no matter how much he ate nothing filled him.
Late in the morning after tossing off yet again Merlin felt like crying. No
matter how many times he came it didn’t help, his little cock stayed thick and
red. Worse he was leaking out of his hole and it wouldn’t stop. Merlin didn’t
know what to do, he wanted to come but it just wasn’t enough and the empty
feeling was becoming all he could think about.
Finally it all became too much and after pulling on a bathrobe he stumbled from
the house and toward the only safety he could think of. Arthur could solve
anything and he always took care of his Little Bird. The one thing Merlin could
count on in his life was that he belonged to Arthur.
Please drop_by_the_archive_and_comment to let the author know if you enjoyed
their work!