
Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/7400296.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Haikyuu!!
  Relationship:
      Iwaizumi_Hajime/Oikawa_Tooru
  Character:
      Iwaizumi_Hajime, Oikawa_Tooru
  Additional Tags:
      Alpha/Omega, Mating_Cycles/In_Heat, Mating_Rituals, Mating_Bond, Mating
      Bites, Dirty_Talk, just_a_bit, Porn, Rutting
  Series:
      Part 4 of Mating_Night
  Stats:
      Published: 2016-07-05 Words: 1445
****** Oikawa and Iwaizumi ******
by Bittodeath
Summary
     There is an old tradition in the lost villages of Haikyuu, to make
     sure there are no unmated young people: once every three years, at
     night, all the youth between sixteen and eighteen are gathered at the
     entry of the village, Omegas and Alphas alike. They presented as
     either Alpha or Omega and, under the watch of the leaders of the
     village, Omegas are sent into the forest, to run and hide themselves.
     A moment later, Alphas are sent after them. The first Omega an Alpha
     manages to grab is destined to become his mate, and they have to mark
     each other during the night and come back to the village once mated.
Notes
     Finally I finished this. Took me long enough.
See the end of the work for more notes
There is an old tradition in the lost villages of Haikyuu, to make sure there
are no unmated young people: once every three years, at night, all the youth
between sixteen and eighteen are gathered at the entry of the village, Omegas
and Alphas alike. They presented as either Alpha or Omega and, under the watch
of the leaders of the village, Omegas are sent into the forest, to run and hide
themselves. A moment later, Alphas are sent after them. The first Omega an
Alpha manages to grab is destined to become his mate, and they have to mark
each other during the night and come back to the village once mated.
This technique is not perfect, but everyone is mated and since their other
senses are hindered, most Alphas rely on their sense of smell and end up
choosing the “best smelling” partner, who is biologically the most compatible.
Thus, blood lines are strong – and no one can complain that they were chosen or
rejected. “Mating Nights” are joyous occasions, often followed by a consequent
number of births.
 
Karasuno Village is a particularly remoted village, with only two women but
luckily just an even number of young Alphas and Omegas. And the “mating night”
as finally arrived, under the supervision of their leaders, Ukai and Takeda –
or, as they are called now that they are mated, Keishin and Ittetsu. They have
gathered all their young ones, eager, bored, excited or frightened.
“It is night. You may go.”
 
Oikawa was probably the only Alpha who wasn’t nervous. After all, he had known
who he would mate with for two years already. He couldn’t help but smile
fondly. Two years ago they had made a promise, but somehow they had known they
were meant for each other for much longer. Presenting as Alpha and Omega had
only enforced their idea. Surprisingly enough, he was the Alpha. Surprisingly,
until they adjusted to each other. Nature was not random. He bit his lips,
impatient to go – and maybe the fact that his rut was drawing near had an
impact on this. Usually, the Mating Night was scheduled for a night when no
Omega would be in heat, and no Alpha in rut. But for them, of course, it
couldn’t work that way. They had been together for long enough that their
cycles had adapted to each other – it was rare, and proof of a deep bond
between mates – and gave them a pleasure more intense than if they were to go
through them alone. Usually, Omegas’ heats were at the same time when they
lived with each other, just as in Karasuno Village. And it had been true for
every Omega present on that night – except one. No one understood why, except
the two of them.
“C’mon”, he breathed, impatient.
On his right, Daichi looked at him and smiled feebly: despite all his “Alpha
acting”, he was as nervous as the others. Finally, Keishin gave the signal and
they all sprung forward. Haphazardly, for all but one. Oikawa immediately ran
to the “naked tree” – it had been struck by lightning a year ago and had lost
its bark. He swiftly climbed up the tree, the enticing sent feeling his nose
and making him dizzy, only hurling his rut. His hand met warm, very warm flesh
– too warm to be someone else – and he smiled.
“Got you, Iwa-chan”, he whispered in a sing-song voice.
“About damn time, I was starting to think I wouldn’t be able to come down. My
legs are trembling and I’m basically dripping wet”, the Omega gruff voice
answered.
Oikawa’s breath was stuck in his throat at those words. He slid his hand
higher, along firm and robust arms, and accidentally brushed Iwaizumi’s scent
gland, making him moan loudly.
“Fuck you, Shittykawa”, he growled.
“Sorry Iwa-chan”, the Alpha whispered, his arms and legs trembling from his
uncomfortable position. “Do you need my help to come down?”
“No, I should be alright”, Iwaizumi replied, and soon after they were both back
on the ground.
Oikawa grabbed his hand and pulled him toward him. Iwaizumi was incredibly hot,
his skin slicked with perspiration as he slowly entered his heat. The sweet,
heady scent was turning Oikawa mad.
“We’d better hurry”, he said, dragging Iwaizumi to the nearest nest.
They were probably the first to be ready to mate on that night, and all the
nests should be empty. They were like cocoons made of branches, filled with
leaves, feathers and wool, with a tiny entrance, a blanket and a small wooden
cage full of ladybugs to illuminate the night. It did not take them long to
climb in, nor to shed their clothes as the air around them warmed up and
captured their scent. Iwaizumi chuckled when Oikawa kissed his lips gently,
still able to control his speed and movements.
“What is it?” the Alpha asked, creeping closer.
“I’m thinking that it is their first time. All of them.”
“They don’t know what they missed.”
“But it must be awkward”, the Omega added, “like, they discover they are to be
mated, they fuck for the first time and they mate? All in one night?”
“Aren’t you glad I took your virginity so masterfully”, Oikawa bragged, a smug
smile on his face.
“You had never been so awkward, Crappykawa”, Iwaizumi answered, drawing near
and settling himself in Oikawa’s lap. “That was the lamest fuck we ever had.”
“We’re supposed to mate tonight, you know, but if you want to go with just a
quick awkward fuck we can also do that”, Oikawa lied – he had things in mind
for his Omega, and they were both too worked up by their cycles to be satisfied
with just one quick round.
“You’d resist me?” Iwaizumi asked, and he was dripping in Oikawa’s lap, warm
and enticing with a scent that sent the Alpha reeling.
“Like you could resist me”, Oikawa retorted, pushing two fingers in him and
gasping at the heat.
Iwaizumi stilled, his breath shortening and slowly turning into moans as his
heat fully kicked in. He was usually lewd, that was something Oikawa had learnt
at his expense, but when he was in heat… God, there was nothing to do when he
was in heat. He was even lewder than usual and unabashed, using his deep voice
and dirty talking to coax Oikawa into indulging him, and it always worked. Not
that Oikawa resisted much anyway.
“Tooru”, he murmured, his voice filled with promises, “please take me, mark me,
bond me, knot me, please just do something.”
He was fidgeting in the Alpha’s lap, rutting against his arousal, and it was
turning the both of them mad. Oikawa forcefully grabbed him and threw him into
the mattress after taking his fingers out, and lined up with him.
“You ready?” he asked, though he knew he was.
Iwaizumi nodded, muscles tensing as he tried to contain his nature and failed.
The Alpha slowly pushed in, his pupils flaring when he bottomed out and he
screamed, his rut taking over his mind. His hands grabbed Iwaizumi’s hips
firmly and he started to thrust at a maddened pace that satisfied the both of
them, though it was too much, clearly too much – but Iwaizumi was moaning about
how good he felt, speared open with Oikawa drilling into him, and Oikawa
couldn’t talk anymore, his jaw hanging low as he violently rocked them. Climax
hit them quickly and suddenly, and finally they unleashed their instincts,
leaning towards each other and biting their neck, leaving a red, angry mark – a
bond.
Maybe they hadn’t thought it over when they decided having their heat and rut
during the Mating Night wasn’t a problem, or maybe they simply didn’t know it,
but the pleasure of bonding triggered a second orgasm that ripped through them,
leaving them boneless, shuddering and hazy. Finally, Iwaizumi hummed – his heat
was coming down for a moment, to let him rest a bit before another round – and
purred:
“I love having your knot in me, you know.”
“Yeah?” Oikawa replied, unable to move.
“Yeah. Feels good. Like we’re connected. Two parts of a same being.”
“You’re being sappy, Iwa-chan”, the Alpha muttered with a smile – of course he
loved knotting his mate.
“Am not.”
“Are so.”
“Am not.”
Oikawa didn’t reply, his eyes were closed and he had fallen asleep on Iwaizumi.
It didn’t take long for the Omega to join him into a blissful sleep.
The morning sunlight found them slowly rocking and moaning together, once again
taken over by their mating cycle. The only difference was the red biting mark
on their necks – a bond, gift from Nature.
End Notes
     I hope you liked it, as usual don't hesitate to comment, either here
     or on my tumblr bittodeath.tumblr.com.
     I don't know which pairing will come next there are still a lot, so a
     little vote perhaps:
     Daichi/Kuroo
     or
     Sugawara/Terushima?
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