Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/12916086.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      僕のヒーローアカデミア_|_Boku_no_Hero_Academia_|_My_Hero_Academia
  Relationship:
      Todoroki_Shouto/Todoroki_Enji_|_Endeavor
  Character:
      Todoroki_Shouto, Todoroki_Enji_|_Endeavor
  Additional Tags:
      Omega_Verse, Alpha/Beta/Omega_Dynamics, Mating_Cycles/In_Heat, first
      heat, Incest, Daddy_Kink, Daddy_Issues, Come_Inflation, Knotting, Verbal
      Humiliation, this_is_a_kinky_mess, im_not_sorry, Todoroki_Enji_|
      Endeavor's_Bad_Parenting, Dubious_Consent, Dirty_Talk, drool, Orgasm
      Delay/Denial, Prompt_Fill
  Series:
      Part 6 of Fills
  Stats:
      Published: 2017-12-04 Words: 2219
****** First Time, Last Time ******
by eerieryoko
Summary
     His face screws up as he inhales, quickly covering his mouth with his
     hand. Shouto blinks lazily, trying to focus his sights on the
     intimidating figure of Enji slowly approaching. He feels his knees
     give out as his father yanks him up by his collar, dipping his face
     down to his neck to sniff at his scent glands.
     xx
     Shouto needs an Alpha, and he's quick to find out just any Alpha will
     do.
Notes
     this is all muffin's fault
     Prompt fill: "You don’t smell it? I’m surrounding myself with betas
     from now on.”
See the end of the work for more notes
Sweat pools at Shouto’s feet, which in itself is not abnormal due to his strict
training regimen. Today, however, something is different. His balance is off,
his energy levels rapidly declining, his vision blurring around the edges.
There is also a burning hunger low in his gut, gnawing away at his ability to
concentrate.

He takes a deep breath, attempting to recenter himself before assuming his
sparring stance. His father stands opposite him, watching him with his usual
frown. His flames plume, blue-white at the tips as he bellows, “Pay attention
Shouto!”

His face screws up as he inhales, quickly covering his mouth with his hand.
Shouto blinks lazily, trying to focus his sights on the intimidating figure of
Enji slowly approaching. He feels his knees give out as his father yanks him up
by his collar, dipping his face down to his neck to sniff at his scent glands.

He finds himself being tossed away as a gruff snarl escaped Enji’s throat. An
unfamiliar whine sounds in the air, lasting a couple seconds until Shouto
realizes the embarrassing noise was coming from his own mouth. He coughs,
sitting up and trying to regain some semblance of composure.

Enji is glaring down at him, warring emotions flickering across his eyes. This
is not a new situation for Shouto to find himself in, but the hunger inside him
seemed to blossom at the raw power exuding from his father. Saliva dribbles
down his chin and onto the floor, mixing with his sweat on the tatami floor of
the training room.

He finds himself crawling toward Enji, his body acting on instinct, ass up in
the air like some red light district whore. Surprisingly, Enji doesn’t flinch
away, stands there and lets Shouto paw at his ankles while wiggling his hips
unabashedly.

“A-alpha…” What is he even saying? He feels his consciousness fading, his
vision blacking out. He needs to be closer to the source of this overwhelming
Alphan scent, needs to touch and be touched, needs to be overpowered and
mounted and claimed .

Any other time Shouto would have been disgusted with himself for presenting
himself in such a deplorable away, especially in front of his father. His
father, #2 Pro Hero of all Japan, Endeavor. Yet he continues, tugging at the
hem of Enji’s track pants and nuzzling his muscular calves.

“Do you not smell yourself, Shouto?” Enji hefts him up by his collar again,
bringing his son level to his face. Shouto only pouts in reply, reaching out
and caressing Enji’s face with both hands. Enji scrunches his eyes shut,
turning his face away for a fraction while Shouto’s soft whimpers continued.

Shouto flinches as his father sighs, fixing Shouto with a fierce gaze. “I have
failed.” He drops Shouto back onto the ground, leaving his son in a heap on the
ground. “You don’t even know what’s going on in your body right now, do you
Shouto?”

Shouto whines, blindly reaching out toward the Alphan presence his body
instinctively craved. Enji’s words aren’t even processing, his body only able
to focus on the growing hunger he needed to satiate. His whimpers turn to
aggravated snarls as Enji backs away from him, heading for the door. This is
unacceptable.

Shouto lets out a low growl as his quirk activates, effectively freezing the
door to the room shut. He hadn’t exactly meant to use his quirk, but it has the
desired effect as Enji stopped and turns to look back at him.

“No. This is not what Todoroki’s do, Shouto. We’re better than this.” Enji’s
body apparently doesn’t listen to what he’s saying, however, as he begins to
make his way back toward where Shouto lies in a pitiful heap on the floor.

“So hot, Alpha please,” Shouto keens, tugging his sweat-soaked tee shirt over
his head, flinging it across the room. He wonders briefly if his flame quirk is
out of control, his temperature increasing tenfold even after he works to rid
himself of all his clothing.

Both their clothes lay rumpled, strewn about the room until they stand before
each other in nothing more than the skin they were born with. Shouto makes no
qualms about taking in every definition of muscle his father has, highly
distracted by the way his quads flex as he redistributes his weight from foot
to foot. He drops to his knees, scuttling forward until he latches himself onto
the inside of Enji’s thighs, quickly working a darkening bruise into the soft
flesh there. He wraps his hands around the back of Enji’s knees, kneading the
bulky muscle there.

An undignified squawk leaves his mouth as his face is forced into Enji’s groin,
but Shouto is nothing if not a quick learner. It helps that he lets his
hormonal instincts take over, having given up to their demands long ago.

He licks a stripe up Enji’s thick cock, pressing with more pressure over the
ropy veins on the underside. He nestles one hand into the thick hair at the
base of the shaft, wrapping his long fingers around it in a firm grasp. He
hears Enji choke out a groan and only grows more determined.

He takes in the head of Enji’s dick, bobbing up and down in earnest. His jaw
aches rather quickly, unsurprisingly due to Enji’s girth, but Shouto is
undeterred; he presses on, saliva dripping down his chin as he tries to open
his mouth as wide as he can.

Later he will burn with shame, but now, Shouto loves it, lets out an ungodly
moan once his nose brushes up against Enji’s pubic hair. Slick drips out of his
ass, wetting his thighs and leaving a stain on the floor. His head swims with
the Alphan scent he’s surrounded by, rubbing the scent glands at Enji’s groin
to unleash more of the essence.

His own cock bobs with each thrust of his throat, swollen and leaking onto the
floor, mixing with the slick puddling there. When Enji grips his hair in a
near-painful grasp and begins to thrust down Shouto’s throat, he’s close to
coming untouched.

But everything stops too soon when Enji rips Shouto away from him, leaving the
Omega blubbering and grabbing at any of Enji’s skin he can reach. He doesn’t
even think to touch himself, too focused on pleasing his Alpha, too trusting
that this Alpha will please him as much as he needs to be pleasured.

“Turn around,” Enji commands, a dark glint to his eye. Shouto balks, pouting at
being pulled away from his father’s dick so forcefully. “ Now, Shouto .” Shouto
squeaks at the authoritative Alphan tone Enji uses now, quick to scuffle around
and stick his ass as high as it will go. He’s doing his best to present, to be
a good Omega, so much so that he mashes his own face into the sticky mess of
his bodily fluids.

Instead of being disgusted he nuzzles into the puddle, laps up his own sweet
slick. It’s more erotic than he could have imagined as he runs his tongue
through the cloying slick, taking in as much as he can before Enji wrenches his
head up, bending his spine in an unnatural way. Shouto purrs at the contact,
eyelids heavy. He nuzzles up into Enji’s large, overpowering hand.

“Behave. Do only what I tell you. And don’t speak.” Enji release his hold on
Shouto’s head, positioning himself behind him and spreading his knees apart as
far as he can. He needs as much room as he can work with, especially since he’s
massive, even by Alphan standards; and his cock is, of course, proportional.

Shouto hums in agreement, wiggles his hips when he feels Enji’s body heat
behind him. He’s already a panting mess by the time Enji spreads his cheeks,
gently rubbing at Shouto’s wet hole. Shouto ruts back automatically, more than
ready for any kind of penetration. Still, he squeaks as Enji slides in one
thick finger all the way to the third knuckle in one fell swoop. He finally
feels the hunger that has been plaguing him for the better part of the evening
ebbing away.

Enji wastes no time in adding in a second finger, Shouto taking the stretch and
burn with an expression that melts from strained to sultry in seconds. Nothing
has ever felt this good before, this right , this perfect . Sure, he’d jerked
off before, but never even thought to penetrate himself. And boy, had he been
missing out.

Once Enji decides Shouto has been properly prepped, which didn’t take much
thanks to Omegan self-lubricating anatomy, he strokes himself and lubes himself
off with leftover slick from his dripping fingers. Shouto turns his head to the
side, makes and hold eye contact with his father for the first time since
before he began sucking his cock.

“Alpha, please. Please , need you, need it, need your knot please, please-”

Enji thrusts in, bringing Shouto’s pleading to a halt. His mumbling cuts off
with high-pitched, closed lip scream, eyes wide at the initial sting as Enji
comes to rest at the hilt of his dick. Shouto pants through the pain, saliva
making a new puddle on the floor.

“What did I tell you about speaking, Shouto?” Enji bellows, pushing Shouto’s
face into the floor and rubbing it in his own drool. “Shut up like a good Omega
would.” He pulls out a few centimeters and thrust back in, repeating the
motions a few times until Shouto finally loosens up for him. “You’re so fucking
tight, Shouto.”

He eventually begins to fuck Shouto at a maddeningly slow pace, bringing Shouto
right up to the brink of orgasm before stilling, driving Shouto into a frenzy.
Shouto knows better than to break his father’s no speaking rule a second time,
gasping for air once Enji released his hold. Instead, he turns his face to the
side and bares his teeth, hissing when Enji teases his engorged prostate for
the nth time.

“Do you want to come, you dirty slut? That’s what you are, a cockslut, for your
own father. How filthy you are, Shouto,” Enji croons, bending low to whisper
right in Shouto’s ear. Shouto keens, panting as Enji continues his slow,
shallow thrusts that bring the head of his cock to rub right against Shouto’s
prostate. Shouto can feel tears well up in his eyes, the need to come
overwhelming. He flinches when he feels Enji grasp his own, neglected dick,
only to hiss again when Enji tightens his grip at the base of his shaft. “Not
yet, you nasty Omega. Did Alpha tell you you could come? Who do you think you
are, trying to get off before me? You do only what I tell you to do, when I
tell you to.”

Shouto sighs in relief once Enji thrusts fully back in. He squirms, the
beginning of Enji’s knot catching on the rim of his asshole. Enji is already so
damn big, he can’t imagine how he’ll be able to handle his knot; but his body
craves it, his Omegan instinct soothing his raising worry. He needs the knot,
it;s his right as an Omega to have an Alpha’s knot, the sole purpose of the
heat he’s going through. Logically, he knows an Alphan knot is the only thing
that will sate his hunger for any amount of time.

His dick pulses against Enji’s grip as Enji’s thrusts quicken. He can’t help
when his mouth falls open and a breathless “ Daddy ,” comes out. Enji stills
above him, his own breath coming in ragged pants. He moves to grip Shouto’s
hips with both of his hands, freeing Shouto’s cock from his iron grip.

The word ignited a frenzy in Enji. “Say it again, Shouto,” he commands, his
knot growing even more as his thrusts become more and more erratic and off
rhythm.

“Daddy, Daddy, Alpha, please, knot, give me, I need it I need it I …” Shouto
continues in a drunken slur. He’s sure to have abrasions on his elbows with how
far Enji’s thrusts are pushing him around the floor. But the pain is secondary,
possibly even adding to, the immense pleasure he feels.

“ Come .” Enji’s barely even gritted out the word before Shouto spills all over
the floor, shudders wracking his body for several seconds while Enji thrusts
until his knot locks him inside Shouto and he results to grinding his hips hard
enough into Shouto’s supple ass to leave marks.

Shouto feels complete as he feels Enji’s come fill his ass, like what he would
imagine fulfilling his life purpose to be. And in this exact moment, his
purpose as an Omega is to be knotted and claimed and taken advantage of by an
Alpha. Even if that Alpha is his father, leaning his sweating, hulking mass
over Shouto’s more lithe frame.

He squirms, letting out a content purr at the satiation he feels from being
filled. He looks down between his elbows, noticing his abdomen a bit swollen,
most likely inflated from the mass amount of come in his body. This only spurs
on his purr.

After a few silent moments of relishing in the absolute heaven of post-mating,
Enji groans. “Never again, Shouto,” he sighs. “Not a word of this. To anyone.
And after this, I’m surrounding myself from Betas only.”
End Notes
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