Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/4654494.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      ダイヤのA_|_Daiya_no_A_|_Ace_of_Diamond
  Relationship:
      Kominato_Haruichi/Kominato_Ryousuke
  Character:
      Kominato_Haruichi, Kominato_Ryousuke
  Additional Tags:
      Watersports, Omorashi, Wetting, Sibling_Incest, im_not_even_sorry_call
      satan_bc_im_going_to_hell, Unbeta'd
  Series:
      Part 1 of Unadulterated_Kominatocest
  Stats:
      Published: 2015-08-25 Words: 2790
****** Aniki ******
by lacepirate
Summary
     Ryosuke is sadistic and I am trash
Notes
     lmao sorry @god
See the end of the work for more notes
Since getting his new game, (that wasn’t actually new, but actually some old
one Ryosuke had fished out of the deepest section of the video game store)
Ryosuke had one more thing to beat his brother at. Haruichi was a little less
than happy, but he played along anyway; anything he could do to please his
older brother was a win by him.
Ryosuke’s apartment wasn’t much, it was typical for a broke university student.
A sofa and a television with older gaming systems taken with him throughout his
time as a student, Haruichi remembers playing against Ryosuke in his old dorm
room, listening to his roommates boast on Ryosuke. The flat had a simple
kitchen and two small bedrooms, with hardly a difference between them, so
Haruichi didn’t know why just one of them was called a ‘master’.
Haruichi always placed his things in the bedroom adjacent to his brothers when
he arrived, whether he was staying the night or not, which in most cases he
always did. He and his brother’s sizes weren’t that different, so Ryosuke
usually gave him things to wear before taking it back before he left again,
heading back to his dorm that felt unusually uncomfortable without his brother.
Ryosuke ordered take out while bragging about how well his classes were going
and how well he got along with his new team, all while Haruichi sipped on his
glass of cola that never seemed to become empty, no matter how long he drank it
for, but he wasn’t about to waste his brother’s food so he downed it
nonetheless.
After dinner, Ryosuke dragged Haruichi into the adjoining living room and sat
down on the sofa, gesturing for Haruichi to set up the game. Haruichi did so
with a flushed face, as per usual.
 
Six rounds of Mario Cart later, Haruichi was groaning under his breath as his
hands tightened on the remote, feeling a familiar press of need on his bladder.
He waited as long as he could before he thought he could go without disrupting
the game too much, quickly pausing at the loading screen transitioning into the
next course.
Haruichi moved to get up and jump over the back of the couch, attempting to
make a bee-line for the bathroom, but a firm fingers strengthened from two
years more baseball than his own were digging in the veins on the inside of his
wrist.
“Where do you think you’re going, Haruichi? We haven’t even finished yet.”
Haruichi’s cheeks burned.
“A-aniki, I-I need to use the washroom.” Haruichi averted his eyes easily under
his curtain of hair.
Haruichi could have sworn he saw his brother’s eyes narrow as his ever-present
smirk slid up his cheek another few centimeters.
“You need to go pee?”
Haruichi nodded.
“No, you can hold it, we’re not done our game yet.”
Before Haruichi could plead to save himself, Ryosuke wrapped his forearm around
his younger brother’s torso, effectively flinging him on to Ryosuke’s lap.
Haruichi’s small gasp turned into a quiet groan when he felt his older
brother’s toned legs wrap around his waist, pressing into his body’s weak spot,
causing him to cramp slightly more than he already was.
The younger’s hands flew to cover himself, trying to hold everything in, for
the sake of himself but more so for the sake of not being scolded and hated by
Ryosuke for accidentally wetting himself on his couch.
Ryosuke peeled Haruichi’s hands away and placed the discarded controlled back
into his shaking palms and unpaused the game for him, seemingly unaffected by
what had just transpired and also that his younger brother was wiggling in an
attempt to not release himself all over him.
Ryosuke played with his head resting on Haruichi’s shoulder, due to the slight
height difference in their statures.
Haruichi payed absolutely no mind to the game in front of him at all. He was
too pre-occupied with the feather-light breath that tickled his neck, gradually
trickling its’ way down his spine and into his groin, causing a whole different
problem to arise.
Haruichi began to panic. He could live with the embarrassment of wetting
himself while physically on top of his brother, but there was no way Haruichi
would ever see Ryosuke again if he found out what actually went through his
head when he had his dorm room to himself.
He tried to wiggle himself free, but Ryosuke’s legs only tightened, causing him
to let out a strangled noise that was caught between a moan of pleasure and a
groan of pain.
“You’ll only make it worse if you move, Haruichi.”
Haruichi tried to ignore his older brother’s voice and breath thrumming
directly into his ear and against his neck, he really did, but there was
absolutely no way Ryosuke couldn’t feel his cock standing at attention against
his thigh.
“A-aniki, p-please I-“
“No, Haruichi, we’re not done.”
Haruichi concluded that he wasn’t speaking about the game anymore when he felt
a hot press of lips against the nape of his neck, following with a teasing bite
on the beginning knobs of his spine.
Surely his older brotherwasn’t thinking the same thing he was. There was no way
on God’s green earth that Haruichi was still conscious right now.
“A-a-aniki…”
“What?”
Haruichi gulped.
“Wh-what are you doing?”
Ryosuke laughed and Haruichi felt the vibrations through his back and into his
chest.
“Surely you’re not that dumb, Haruichi.”
Haruichi couldn’t bring a response back out of his mouth.
He unconsciously gasped and clenched his stomach muscles when the younger felt
Ryosuke sucking what was going to be a brutal hickey into the side of his neck,
where his jaw met throat and also where his pulse sped.
“Aniki, p-please I need to use the washroom!”
Ryosuke responded by digging his legs in harder at the base of Haruichi’s
torso.
Haruichi’s hands flew to cover himself, trying to prevent the inevitable.
“Aniki please, I’m going to- Ah!”
Ryosuke giggled menacingly.
Haruichi tried harder to hold it in; harder than any game he’s ever played,
ignoring the agonizing pain stabbing at his lower gut, but he couldn’t deny
himself the short taste of relief when he felt the dam gates break, feeling the
beginning of his bladder emptying against his will.
White hot relief flooded him for around five seconds before he had enough sense
to compose himself before making too much of a mess, even if it was caused by
his brother.
“Oh, look at the mess you’ve made Haruichi. You couldn’t have held it longer? I
thought you were better than that.”
Haruichi remained with one now wet and warm hand pressed to his crotch, while
the other flung up to cover his mouth, trying to evade the quiet sobs that
threatened to escape from his throat.
Haruichi hurled himself off of Ryosuke and this time the elder didn’t try to
stop him, only watching him with a sadistic smirk on his face as he ran to the
washroom, in so much of a rush that he forgot to close the door behind him.
Ryosuke looked down and smirked at the small pooling of urine on the floor
between his feet before getting up and calmly walking over to the washroom
Haruichi had receded into.
He found Haruichi fallen to his knees on the tiled floor, silent sobs shaking
his shoulders.
 
“A-aniki, I’m s-so sorry, I didn’t mean to- but, I tried- I mean, you wouldn’t
let me-“
“Oh, so now you’re blaming me for your own mess, Haruichi?”
Haruichi’s eyes widened at the thought of his brother hating him and he was
quick to rapidly shake his head.
“Aniki, can I go, please?”
Ryosuke hummed in consideration.
Before answering Ryosuke dropped to his knees alongside his brother.
“Do you feel you deserve to?”
Haruichi averted his brother’s searching eyes.
“Answer me, Haruichi.”
Haruichi paused another moment.
“Now.” He barked.
Ryosuke reached out a flat hand to the bottom of his slightly bulging abdomen
and pressed firmly with equal pressure on all the right places to make Haruichi
squirm and clench his thighs closed even further.
“Ah! No!”
“And why not?”
Haruichi let another tear slip to his sticky cheeks.
“B-because I made a mess.”
Another grin slipped on to the older’s face.
“That’s right. So, I guess I’lljust have to do it.”
Haruichi felt his breath hich.
“What?”
When no reply came, Ryosuke pushed the boy to lay flat on his back with his
thighs parted slightly, putting the large wet spot on the front of his pants on
display, much to Haruichi’s embarrassment, but he submitted to him anyway. He
would never fight against him.
However, he tried to protest when Ryosuke’s hands began to edge themselves
under the waistband of his sweats.
“Aniki, no! Please, I-“
“You what? You don’t want me to see that you’re disgustingly hard from your
older brother making you piss yourself?”
Haruichi flung his hands to hide his face almost faster than the speed of
sound.
“I know what you think about, Haruichi. I can read you like an open book. I
know all about your dirty fantasies that no younger brother should ever have
about their older siblings.”
“H-how-“
Ryosuke grinned, showing a flash of teeth he knew that Haruichi could see
between the breaks in his fingers.
“You always leave your old journals in your room when we go home on breaks,
only to grab a fresh one before we leave, and you didn’t hide the old ones very
well.”
Haruichi thought about the wooden box hidden under his bed at home, the image
of Ryosuke firmly gripping his leaking cock as he read on about his dreams and
fantasies alike filled his head.
“I have to say, you starting thinking about dirty things long before I did. You
were such a dirty child, Haruichi and you continue to be a dirty teen. I bet
you that your new journal is almost full back at the dorms because you felt
less of a threat of me finding it once I left.”
Haruichi couldn’t deny it. He really could read him like an open book, even if
he thought he was being closed off, Ryosuke continued to pry until he knew more
about Haruichi than he did himself.
Ryosuke quickly pried his hands off of Haruichi’s face, lacing his one hand
into his hair and exposing his two intrigued eyes.
When Haruichi let his hands drop, Ryosuke held his gaze and ducked his head
down to clasp their lips together, Ryosuke quick to gain access to the inside
of his mouth and easily gain dominance.
Ryosuke’s free hand slipped down in between their torsos and once again pressed
the palm of his hand to Haruichi’s bladder.
Haruichi groaned and tried to draw his legs up and away from his brother.
“Let it go Haruichi.”
Haruichi put up slight resistance, but ultimately will always follow his
brother’s word, knowing he would never lead him wrong.
Haruichi’s cheeks flooded with the remaining blood in his body when he felt
himself break.
Haruichi relished in the relief and release while Ryosuke relished in the heavy
obedience of his younger sibling.
Warmth flooded his lap, a small swishing sound filling the sterile air, and he
couldn’t help but look away in shame, even if he was told to do so.
When Haruichi finished, his cheeks still burned like nothing else he had ever
experienced, until his heart leapt into his throat at his brother’s words.
“Good boy, Haruichi.” Ryosuke’s voice was dripping with desire, consistently
pecking his lips up the side of Haruichi’s rosy neck.
Ryosuke sat back and admired the mess Haruichi had made, the small puddle he
was laying in.
Ryosuke stood and purposely fiddled with the leather belt around his hips.
“On your knees Haruichi.”
Haruichi was quick to obey.
The elder lowered his zipper, stroking himself from the outer layer of his
clothes before plunging his hand beneath the waistband of his boxers.
 
When Haruichi could see the outline of Ryosuke’s cock through his clothes, he
involuntarily shuffled forward on his knees and placed his hands flat on
Ryosuke’s thighs.
Haruichi paled in desire when he was met with the view of smooth, untouched
skin, the tip currently slightly shiny with the new addition of pre-come.
Ryosuke laughed at his brother’s dumbfound expression.
“It’s nothing you haven’t seen before, Haruichi.”
Haruichi paused.
“Um, I-I haven’t-“
“I know Haruichi, I’m not stupid. Just watch your teeth. I expect the most of
you after reading all of your entries.”
It was to be anticipated that Ryosuke wanted the most of him.
Haruichi swallowed and licked his lips before tentatively darting his tongue
out to taste the (newly discovered) salty taste of the slimy substance.
He dragged his hand to cover the base of Ryosuke’s length while he gently took
the first of it into his mouth, being sure to tuck his teeth under his lips.
 
Ryosuke showed no expression. It wasn’t that he wasn’t enjoying it, far from,
but he was too busy with his fist entangled in Haruichi’s bangs, showing off
the hidden part of his face at the elder’s mercy.
Haruichi’s eyes didn’t leave Ryosuke’s; searching for some nod of approval.
It was when Haruichi hollowed his cheeks and sucked harddid he get a small hum
out of Ryosuke.
“You’ve practiced this before Haruichi. This doesn’t come natural, who are you
being a little cockslut to? Sneaking off to someone else’s room while your
roommates are sleeping?”
Haruichi alarmingly pulled away.
“N-no! It’s not like that!”
“Oh, so there is a ‘that’.”
“No!”
“Don’t lie to me Haruichi.”
Haruichi blushed and dropped his gaze to the floor, only to have his head flung
back again, through the rough force of his brother’s fist in his hair.
“What have you been doing?”
Ryosuke teased the edge of his cock along the slightly parted seam of
Haruichi’s lips, his hot pants coating the tip.
“I-“
“Hm?”
“E-eijun-kun gave me a g-gag gift for Christmas a few months ago and I couldn’t
bring myself to get rid of it!”
Ryosuke’s grin increased tenfold.
“Oh? Really now? Is practicing blow jobs like a slut all you’ve been doing? Or
have you been fucking yourself on it at night in the locker room, trying to
keep quiet and thinking about how aniki’scock would be so much better up your
tight ass?”
Haruichi couldn’t held his eyes glazing over at the thought and the pure
obscenity of his words and how he didn’t seem bothered in the slightest by
them.
“No! I haven’t! I swear!”
“Good, because I’ll be the only one who’s sliding into your little asshole.”
Ryosuke resumed pushing himself past the heat of Haruichi’s lips, grinning when
he saw Haruichi’s hand retreat below his own soaked pants.
Ryosuke couldn’t help the coiling heat at the base of his belly when Haruichi’s
determination increased by the thought of his older brother fucking into his
ass as ecstasy took over the small boy.
He curled his fingers back into the crown of his head and released himself from
Haruichi’s mouth, only to resume the motion with his hand sliding over his spit
slicked skin.
Haruichi was quick to notice and anxiously pushed his tongue from his mouth in
a waiting position.
“So good for me Haruichi.”
With one last grunt and a small gasp from the boy below, Ryosuke felt the red
hot knot in his belly uncoil and watched the creamy strips drip from Haruichi’s
face as he tried to eagerly lick up what he could reach with his tongue.
Ryosuke smeared some caught below his eye on to his thumb and placed it in his
younger brother’s mouth, feeling his lips close around his appendage.
Haruichi was fervently awaiting instructions for him to be allowed to resume
his own ministrations on himself.
“You can come now, Haruichi.”
It only took two strokes before Haruichi was spilling himself, dirtying his
pants even more.
Ryosuke smirked and leaned down, capturing his lips in a seal of promise for
next time.
The elder leaned down and gathered Haruichi in his arms, carrying his weakened
body over to the shower head and cleaning him, all the while peppering his
slightly developed body with kisses.
After he was finished, Ryosuke continued to pick him up again, wrapping him in
a warm towel and carried him to his own bedroom, forgetting about his items in
the one adjacent.
Ryosuke prepared him to sleep, placing him in a pair of clean pants before
crawling in behind him and kissing the small spot under his ear before
whispering one last sentence before the younger passed out for the night.
“Good night, Haruichi.” 
 
End Notes
     get the luigi board, we need to contact satan
     come join our hell
     baseballgays
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