Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/7262935.
  Rating:
      Explicit
  Archive Warning:
      Choose_Not_To_Use_Archive_Warnings, No_Archive_Warnings_Apply, Underage
  Category:
      M/M
  Fandom:
      Teen_Wolf_(TV)
  Relationship:
      Derek_Hale/Stiles_Stilinski
  Character:
      Sheriff_Stilinski, Stiles_Stilinski, Derek_Hale
  Additional Tags:
      socially_accepted_incest, Knotting, Alpha/Beta/Omega_Dynamics, Omega
      Stiles_Stilinski, Alpha_Derek, AU_-_human(ish), Implied_Alive_Hale
      Family, Non_werewolves, Rough_Sex, Barebacking, Underage_to_some_-_but
      not_in_context_of_fic, Stiles_is_16_when_he_and_Derek_has_sex, Derek_is
      older, Sheriff's_name_is_John, Because_author_lacks_imagination, PWP,
      Plot_What_Plot/Porn_Without_Plot, biology_fails_-_just_suspend_your
      disbelief, implied_possibility_of_mpreg, Currently_NOT_an_mpreg_fic,
      Ambiguous/Open_Ending
  Series:
      Part 1 of (The_one_where_I_fail_at_titles_and_really_need_suggestions)
  Stats:
      Published: 2016-06-21 Words: 2959
****** (I Fail At Titles - suggestions welcome) ******
by thingsiwontadmittohavewritten
Summary
     When omegas go into heat their closest alpha relative is required to
     knot them to keep them from hurting, until a heat partner or
     potential mate can be found. And of course Stiles chose an alpha
     seven years his senior and all his dad can do about it is a whole lot
     of nothing if Derek Hale agrees.
Notes
     Potentially spoilery:
     In this society when an omega goes into their first heat it's
     expected that the closest male relative will knot the omega to
     alleviate the heat pains, but the act itself is in this instance not
     considered sexual and therefor not viewed as incest. If it creeps you
     out don't read, as it starts with the sheriff knotting a 12 year old
     Stiles.
     Then omegas find a heat partner (with whom they have sex) or a
     potential mate (with whom they don't, as a potential mate can keep
     the heat manageble by presence and touch). When an omega turns 16
     they are required by law to mate on their first heat after, and it is
     now legal for a mate to knot the omega and potentially impregnate the
     omega.
     When that's said, this is not an "omegas are property"-fic, and they
     have the exact same rights as everybody else.
See the end of the work for more notes
With his fingers buried inside his son, making sure the boy is both
sufficiently stretched and wet before he has to let his son’s future mate into
the room, he can’t help but think back to the first time the kid – legally old
enough at sixteen or not he will always be a kid to John – went into heat and
everything that has led to this particular day.



The first time his son went into heat he’s ashamed to admit he’d been so busy
with work he’d missed the signs, which was why he came home from a double shift
dead on his feet and as he opened the door to his son’s bedroom was met with
the pitiful sight of the boy trying to jam his whole hand inside his body, his
face contorted in pain and tears streaming down his cheeks. Instinct brought
him across the room with no memory of opening his pants and pulling out his
dick, sheathing himself inside his son. The boy had started moving instantly,
hard, uncoordinated thrusts that had John’s knot forming within seconds in
response to both the movements and the smell of despair in the air. When he was
finally locked inside the kid he heaved a deep breath, fell forward and
immediately passed out.
Having to call the station for emergency leave with his child attached to his
dick was a special kind of humiliating, seeing as he had to admit having been
blind to his own boy’s needs, but luckily Marge wasn’t a woman who would tell
others about his failures, but would instead either make up a plausible excuse
or make it seem that it was planned absence. Either way John could concentrate
on getting Stiles through his first heat, and then make sure they could start
the process of getting him a proper heat partner.

Stiles told him who he wanted as his heat partner, and predictably John threw a
fit worthy of any three year old’s worst temper tantrum. He raved and ranted,
yelled and screamed but Stiles wouldn’t change his mind, and so John had to
formally request if Derek Hale would consider being his son’s heat partner and,
should they find themselves compatible, future mate. He almost had a heart
attack when Derek Hale gave an affirmative answer and the process of letting
the two meet could begin.
It’s not that John didn’t like the Hales; because he did they were good people
and upstanding citizens who donated generously to the community and helped
wherever they could. But, and there is always a but, Derek Hale was six or
seven years older than his boy and was the town bad boy with a less than
flattering reputation. Sure he did the same things his parents and siblings
did, but old ladies went to the other side of the road when they saw him and
parents kept their children away from him, whispers about how he once tried to
burn down his family’s home – with them still inside. Of course John, being the
sheriff and all, knew that had been some crazy person with an unhealthy
fixation on the Hales in general and Derek in particular, but it didn’t change
that the young man still looked more likely to murder you with his bare hands
than help you carry your groceries. However, Stiles wanted and it was John’s
duty to at least try getting him what he asked for.

They met once a month for the next year, always supervised by John and Derek’s
mother, Talia, even as they had to get creative around Derek’s rut and the
official requirements, but in the end both Stiles and Derek expressed that they
wanted to see if they were heat compatible and those arrangement were made too.
Normally John wouldn’t come to work during Stiles’ heat, seeing as he’d have to
knot the kid to alleviate his pain at random times, but the rules required an
omega to be at the height of their heat and unknotted when determining the
biological compatibility between heat partners, so this time he left for a
double shift before Stiles’ heat sat in and didn’t go back before he could meet
Derek at the front door.
As it had the first time the smell of despair and pain hit him hard and
combined with the tears on his son’s face he almost lost all resolve and went
to untie the boy. He was dressed in a thin shirt and a soft pair of sweat pants
and there were angry red welts on his wrists and ankles where he had fought
against his restraints. This was all part of the compatibility test to see if
Derek could calm the omega enough that he would stop struggling, but all John
could see was his boy in pain, but before he could do anything Derek was
already there, kneeling beside the bed his hands on Stiles’ face turning it
towards him soothing noises coming from his throat. At first Stiles’ eyes were
glazed over and looking far away but Derek’s touch and voice seemed to reel him
back in, his gaze regaining focus and his tears coming to an abrupt halt. John
didn’t really know if he should be glad that it worked or angry, he still
hadn’t warmed up to Derek and the thought of the older man being his son’s
partner didn’t sit right with him. Not for the first time John wished Stiles’
would’ve chosen someone from his classes, like Lydia or Jackson or maybe even
Scott, but Stiles had never wanted anyone but the stoic figure kneeling on his
bedroom floor.
As he was watching Derek’s thumbs started to rub gentle circles along Stiles’
cheekbones and he could see the instant the kid’s body relaxed and he went
completely lax in his bed. They remained like that for hours, John standing in
the door observing, Stiles lying on the bed eyes glued to Derek’s face and
Derek kneeling on the floor eyes equally glued to Stiles, and then he began to
talk, loud enough for Stiles to hear but not loud enough for the sheriff,
unless he shifted and strained his ears. Which of course he did, he was a
worried parent who didn’t think the man in front of him was worthy of his son,
but as Derek talked John found himself changing his opinion as Stiles’ smile
grew wider and brighter. Eventually he went down stairs – rules be damned – to
make dinner and when it was almost done he went back upstairs to get Derek to
set the table and find out if his son needed his help anymore. The final nail
in the coffin that held John’s resentment towards Derek Hale was when he freed
his boy from the restraints and the kid remained clear eyed and refused his
knot, declaring he was hungry.
From then on out John was wholeheartedly behind his kid’s plan of mating with
Derek when he was old enough and legally required to do it anyway.

Derek went away for school but would always be back to assist Stiles during his
heats. He wasn’t allowed to knot the boy, something that was only legal for the
closest alpha male relative until an omega came of age, but his presence was
calming to the omega and having proven they could both show restraint John even
left them alone for short periods of time, giving them a little privacy seeing
as they couldn’t spend that much time together outside of Stiles’ heat these
days.
With Derek away Stiles started spending time with the Hales and when the
sheriff had night shifts he tended to sleep in one of their guest rooms. It
gave John peace of mind that his kid was looked after and didn’t have to be
alone time and time again. It even had the added benefit of Stiles’ grade going
up until he was at top of his class and was suddenly in the run for
scholarships if or when he wanted to go to college. John had always considered
himself a proud father but by now he was bursting at the seams with it.



And then finally everything was finalized, stamped and government approved and
his son would officially be mated to Derek Hale when the first heat after his
sixteenth birthday was over, which of course was why John’s sitting on his
son’s bed with his fingers probing the boy’s body to make sure that the kid
won’t end up hurt, and satisfied that Stiles is as wet and stretched as John
can manage to get him – he’d had to wear Derek’s clothes to even get the omega
to slick – he withdraws from the boy and kisses him gently on the forehead.
Stiles is miles away rocking back and forth but not really noticing anything
beyond the tantalizing little hints of Derek’s smell that has him panting in
want, and then there’s nothing until his senses are flooded with Derek, his
mate, his forever, and there’s hands all over him, petting his flank, brushing
a nipple, warm against his belly and back, down over his ass and thighs before
coming back to hold his face and turn it a little to the left, forcing Stiles
to focus on the man standing in front of him. It registers that Derek is
presumably naked but all his attention is on the heavy cocky right in front of
his eyes. He’d never thought he’d find a dick beautiful but he thinks that if
he could get his brain back online he would make odes in the honor of Derek’s.
It’s huge and awe inspiring and Stiles doesn’t even think before he licks his
lips, opens his mouth and just goes for it.
It elicit a strangled noise from Derek and his hands tangle themselves in
Stiles’ hair, but seeing as the man doesn’t try to stop him Stiles simply
continues his mission of getting as much as possible into his mouth, and to
taste every last inch of Derek’s length. He’s never done this before, heat
partners with biological compability aren’t allowed to be naked together
because there’s a risk they won’t be able to control themselves, and the
subsequent risk of getting an underage omega pregnant is high enough that not
even his surprisingly liberal dad would allow it, but what he lacks in skill he
makes up for in enthusiasm, and it must work seeing as Derek’s hands are
tightening in his hair his entire body going completely rigid before he shoots
down Stiles’ throat, and it’s warm and gross and Stiles almost throws up but he
sees it through swallowing every last drop, moaning in protest when the flaccid
member falls from his mouth and then Derek is there, lips against lips a hot,
moist tongue inside his mouth that isn’t Stiles’ own, licking over his teeth,
tongue and roof of his mouth, removing all traces of sperm that coated his
mouth seconds before, Derek groaning at the taste of himself and Stiles can
feel how he starts to slick even more, can almost imagine it dripping from him
and then between one blink and the next he’s face down on the bed and strong,
warm hands on his hips are yanking his ass up, insistent thighs making their
way between his legs forcing him to spread his stance wider, until his knees
are at the very edge of the bed.
He can feel the cool air against his skin, Derek’s hands spreading his cheeks
and the most private part of himself is laid open for the world to see. He can
feel how it expands and contracts under Derek’s heavy gaze, how every shallow
breath he takes pushes more slick forward and out, trying to lure the alpha in
by smell alone. Stiles can’t talk, can barely breathe as he lies there under
Derek’s scrutiny, but he almost screams when the man leans forward and a
hesitant tongue strokes over the sensitive skin of his hole. He makes a noise,
he thinks he makes a noise and it’s rewarded with Derek simply plunging inside
him, his tongue licking Stiles open in a way that has Stiles’ brain completely
whitening out, and he’s lost to the feel of the man behind him.
Derek’s stubble burns the sensitive skin on his cheeks as the man tries
vigorously to bury himself inside Stiles’ heat, his tongue fucking in as deep
as it can, licking the walls of his entrance coating them in saliva before it
retreats catches on his rim where it probes and tastes and massages, and then
Derek’s entire mouth is on him kissing him, biting and licking until Stiles is
a shivering, whimpering mess begging for release but unable to touch himself or
even get any friction with the way Derek has placed him. He can’t be sure how
long Derek keeps going, there’s a clock on the wall opposite the bed but Stiles
has no energy to track time, but he does notice when Derek’s fingers decide to
join he questing tongue. The digits go further than the tongue could and when
Derek finds the bundle of nerves inside him all bets are off and Stiles empties
himself without warning or sound on the sheaths beneath him, distantly he can
hear words spilling from Derek and feel the hand soothingly stroking his flank
while the hand on his ass never relents in its exploration, but all Stiles can
concentrate on is how his hole seems to spasm around Derek’s fingers, gripping
him tight to lock him inside Stiles’ body, the feel of his cock as it twists
and softens and how good it had felt even as something tells him it could’ve
been even better.
Derek doesn’t stop his ministrations but as soon as Stiles is completely soft
again he keeps his fingers away from his prostate and goes back to the simple
in, out, scissoring he started with. Stiles’ is almost half asleep, blown away
by his orgasm and the repetitive motions in his ass when he suddenly feels as
if he’s being split in two and having the air punched out of his lungs before
he suddenly moves. Having Derek’s cock inside him is infinitely better than his
tongue and fingers; he can feel every vein and ridge in it as it is forced
inside him, not giving him even a fraction of a second to adjust to the feeling
of being full. He remembers those first heats, before Derek, where his dad had
to knot him to keep him sane, but if he thought that had been anything like
this he’s sorely mistaken. His dad had always been gentle but unmoving, letting
Stiles do what he had to, but Derek is like a wild animal chasing his own
release not sparing more than a fleeting touch to make sure he doesn’t hurt the
man beneath him. He pulls out to the tip and then rams right back in over and
over despite Stiles’ body trying to grip him and hold him tight, despite the
pained noises falling from Stiles lips that eventually turn to moans and
whimpers of pleasure as he adjusts to Derek’s length. Stiles wants it to stop
and to last forever but there’s no way to make Derek stop now, the alpha won’t
be able to until he has knotted the omega and claimed him and Stiles will just
have to lay there and take it.
The only sounds in the room is Derek’s labored breath, the slap of his balls
against Stiles’ skin on the banging of the head board against the wall.
Somewhere Stiles knows his dad can hear and know what it means but right now he
can’t care, simply holding on for dear life trying not falling down the bed or
ramming his head straight into a broken neck against that very head board. The
feeling of Derek’s knot is a surprise, somehow he didn’t expect Derek to knot
him on the first try, but as it tugs against his rim every time Derek pulls out
and the pushes back inside his mouth falls open and his breathing sounds even
more ragged than Derek’s even if he’s just laying still letting the other man
do all the work. When Derek’s finally too swollen to withdraw he starts pushing
deeper, forcing Stiles’ thighs even further apart his hands spreading Stiles’
cheeks to be able to see exactly where they’re connected and then Derek stills
and Stiles can feel it, Derek’s cock nestled inside him right against his
prostate and it erupts in a fountain of seed that adds to the pressure inside
him, Derek’s hips thrusting into him the knot preventing his seed to leave
Stiles’ body and then he’s suddenly upright, his ass resting against Derek’s
hairy thighs and he has a second to enjoy the coarseness of them against his
skin before Derek’s teeth clamps down on the juncture where neck meets
shoulder, and he erupts himself as he screams, not sure if it’s in pain or
pleasure and then there’s nothing but darkness.

Stiles wakes up face down in a pool of his own come, his neck hurts but his ass
is on fire and it feels as if it has been cut in half and then stitched back
together without anybody caring for anesthetics or pain meds. It takes a lot to
get out of bed and limp towards his bathroom, every ache letting itself known
making him move as if he was ninety and half dead. The warm water soothes his
aches and by the time he’s dried off there’s nothing left but a hollow feeling
of being empty and alone.
End Notes
     Usual disclaimers
     One day I will learn about br and p - this is not that day.
     Comments and critism welcome
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