Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/667667.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      M/M
  Fandom:
      Ao_no_Exorcist_|_Blue_Exorcist
  Relationship:
      Okumura_Rin/Okumura_Yukio
  Character:
      Okumura_Rin, Okumura_Yukio
  Additional Tags:
      Medical_Kink, Medical_Procedures, Sibling_Incest, Incest, Hand_Jobs,
      Aphrodisiacs, Fingerfucking
  Collections:
      Ao_no_Exorcist_Kink_Meme_fills
  Stats:
      Published: 2013-02-02 Words: 2880
****** Medical Procedure ******
by Denshi_Alpha
Summary
     Yukio tries to give Rin a couple of vitamine injections, but Rin
     develops an unexpected, startling reaction to those, and it is up to
     Yukio to help him.
Notes
     Written for Ao no Exorcist kink meme @ LJ
‘Nii-san, you’re being childish,’ sighed Yukio.
‘I don’t care, just don’t come any close with those needles!’ Rin backed away
from Yukio and pressed into the corner of their room, his tail wildly lashing
against his legs.
‘Nii-san, it’s just a couple of injections!’
‘I don’t need any! You know that ghoul poison doesn’t work on me! I'm fine, I’m
telling you!’
Yukio shook his head. True enough, Rin was quite resilient. And yet, after all
that ordeal with ghouls, Yukio could not help but worry about his brother. Even
though he had treated and cleaned all Rin’s superficial wounds and scratches,
he still felt like he had to do something more. And vitamins and nutrients, as
well as his special self-made herbal health supplement, never hurt anyone.
‘Please, nii-san. You know we can’t take you to the school nurse, she would
definitely ask questions about your tail. And giving you those three jabs will
at least make sure you’re perfectly fit!’ Yukio gave his brother a serious
look.
Rin frowned and said: ‘I just don’t like needles...’
Yukio smiled encouragingly: ‘Nobody does, but don’t worry, it will only hurt
for a moment! Come on now. Do it for me!’
Yukio cringed at himself, saying something like that was a pretty low blow,
taking into account the fact that his brother really would do pretty much
anything for him. But at least it worked – Rin slowly came out of the corner,
looking like he would be executed any moment now.
‘O-ok, but..’ Rin was almost sniffling. Yukio bit his lip. Rin really did hate
needles, maybe he shouldn’t force his brother. But then again, it was for Rin’s
own good.
‘Drop your trousers and get on the bed,’ Yukio said, trying to sound cheerful
and professional.
‘Trousers? What for?’ Rin asked suspiciously.
‘Well, these are going to be intramuscular injections,’ Yukio explained.
‘In the butt? No way, I won’t be able to sit down afterwards!’ Rin protested,
protectively clutching his backside.
Yukio was already getting annoyed with the conversation and briskly said: ‘Well
then, it’s a good thing tomorrow is Saturday and you won’t need to sit in
classes. Now let’s get this over with!’
Rin sniffled again, muttered something that sounded like ‘Yukio is so evil’,
but took off his trousers and lay on the bed dressed in just his white cotton
undershirt and striped briefs. His tail was nervously twitching and apparently
trying to somehow cover up Rin’s mint-coloured striped underwear. Shimapantsu,
that was rather cute, thought Yukio. But of course, he did not say that out
loud. He approached the bed and sat on the edge of it. Rin nearly jumped out of
his skin.
‘Relax, it will hurt more if your muscles are tense,’ Yukio said soothingly.
‘And hold this!’ He moved Rin’s tail out of the way and let Rin grab onto it.
Then Yukio carefully grasped the waistband of Rin’s underwear and pulled it
down just enough to reveal the top of the gluteal muscles. He rubbed the spot
with a cotton ball soaked in alcohol, and the sharp smell seemed to hang in the
air.
‘This is going to be the first one,’ Yukio warned Rin and without further ado
pierced his brother’s skin with the needle and pressed down the syringe
plunger.
‘Ow, ow, ow, ow, it stings!’ Rin whimpered.
‘Vitamin injections always do,’ Yukio said and pulled the needle out. A tiny
drop of blood welled up on Rin’s skin, and Yukio pressed a clean cotton pad
against it.
‘Just two more now!’ he said. ‘You’re doing really well!’
‘No, no more, it hurts! You’re just a sadist, aren’t you? All these years and I
never knew my brother was a sadist!’ Rin protested and squirmed on the bed.
‘I’m doing it for your own good, you know,’ Yukio objected. ‘And you should try
and man up at last. I’m sure Suguro-kun would not make such a fuss about a
little prick.’
‘That’s because he is a prick,’ mumbled Rin, but at least his competitiveness
was awakened and he did not object much when Yukio gave him a second injection,
although he did whimper when medicine entered his body.
‘Now for the last one,’ Yukio said.
‘Yukio, seriously, stop it. I can’t handle it anymore, please, that’s enough!’
Rin seemed to be shaking, and Yukio stroke his brother’s back soothingly.
‘What’s wrong, nii-san? You took those two injections so well, you were really
brave. You’re not backing out of it now?’
‘But it hurt!’ Rin complained.
‘This last one is a special herbal mixture I made myself, it has wonderful
restorative and invigorating characteristics!’ Yukio said.
‘Made it yourself? Are you sure it works like it’s supposed to? You’re not
going to use me as a lab rat, are you?’ Rin asked suspiciously.
‘Nii-san, how can you even say that? I have tested this mixture extensively,
including testing it on myself!’ Yukio was somewhat offended at Rin’s doubts.
‘Ok then, I guess you can do me, too. I mean, give it to me. I mean...’ Rin
babbled.
‘I understand, nii-san. Just calm down,’ Yukio reassured him and rubbed the
alcohol-soaked cotton over a new spot on Rin’s bottom.
Rin hissed in pain during the injections, but he didn’t say anything. Yukio
pressed another cotton pad against his brother’s butt and pulled up Rin’s
underwear.
‘Now just stay like that for a bit and let the medicine work,’ he advised Rin
and stood up to put away the medicine and the syringes.
‘Yukio, I feel weird!’ Rin said in a strange voice. Yukio looked back at the
bed.
‘Yukio, that stuff you gave me... It’s not working properly!’ Rin gasped,
rolled over and pointed at his unexpected erection.
‘Oh my!’ Yukio pushed his glasses higher on the bridge of his nose. That was
definitely not the effect he had expected. What now?
‘Yukio!’ Rin whimpered.
‘Right, I’ll just look the other way and you take care of it!’ Yukio said,
getting himself together. Before he even managed to finish the sentence, Rin
had already eased down his underwear and was eagerly stroking his very erect
and very wet cock. Yukio blushed and turned around not to watch, although he
could still hear everything. It occurred to him that he should perhaps leave
the room, but then again, leaving his brother in such a difficult position when
he was having an unforeseen reaction to medicine might be dangerous. The sounds
of flesh against flesh were faster and louder now, and Yukio heard Rin groan.
That was probably his orgasm, Yukio figured. It was probably safe to turn
around now. He did just that.
‘Yukio, it didn’t work!’ Rin sounded somewhat panicked. Yukio looked down at
Rin’s problem area and indeed, Rin’s cock, now even more slick with fluid
because it was covered in sperm, was still proudly standing up.
‘Nii-san, calm down. Just do it again,’ suggested Yukio. This time he did not
even bother to look away, although he felt quite embarrassed by the situation.
But observation was necessary, in case Rin was doing something wrong. And his
concerns proved justified, Rin was stroking his cock too fast and gasping:
‘Yukio, it’s not working at all, I don’t feel anything!’
Yukio winced at how Rin’s hand was almost a blur over his stiff cock and said:
‘Stop, Rin. You’ll hurt yourself like that.’
Rin visibly reluctantly stopped, let his dick go and moaned at the loss of
contact. ‘Yukio, do something! This is driving me crazy! It hurts!’ he panted.
‘Right, right,’ mumbled Yukio. Do something, that was easy to say. But what?
And then it occurred to him that it was almost certain that Rin had never had
any sexual contact to other people. Maybe they sheer novelty of being
intimately touched by someone else would prove exciting enough for Rin to
orgasm? That theory deserved to be tested.
‘Just let me...’ Yukio said somewhat embarrassedly, sat down on the edge of the
bed again and gently took Rin’s cock in his hand.
The effect was immediate. Rin moaned and pushed his hips out to get more of his
dick into Yukio’s grasp. Yukio gulped. Sure, he had seen his brother naked
before, but this was completely different and so much more intimate! Rin’s cock
felt wet and hot in his hand, and Yukio almost forgot how masturbation works,
despite the fact that he did it himself every so often.
‘Yukio, please!’ Rin begged, and Yukio could clearly hear how desperate Rin
was. Yukio took a deep breath and started slowly working his brother’s dick,
sliding his fist over the dripping member.
‘Oh, this is so good...’ Rin managed. He spread his legs wider to give Yukio
more access, and moaned and panted at every movement of Yukio’s hand over his
most sensitive body part.
‘Yukio, I’m gonna...’ Rin warned.
‘Just go ahead,’ Yukio said encouragingly and sped up a little. Rin almost
screamed, and Yukio looked down just in time to see Rin’s cock spew out white,
warm semen all over Yukio’s hand. Yukio let go and went to look for a tissue.
That should take care of it, he thought.
But Rin called him again, lust and panic mingling in his voice. Yukio looked
back at his brother writhing on the bed, and sure enough, the erection was
still there. In fact, Rin was furiously jerking it again.
‘Rin, stop, you’ll rub it raw!’ Yukio felt seriously concerned now. But Rin did
not listen. Yukio decided that desperate situations called for desperate
measures, unbuckled his belt and pulled it out of the belt loops.
That ought to work, he though. He approached the bed, grabbed Rin’s hand and
put it on the headboard. Then the other hand, with difficulties prying it off
Rin’s cock. And then before Rin even managed to let go of the headboard and
grab at his dick again, Yukio securely tied both of his brother’s hands to the
headboard rungs with his belt.
‘Yukio, let go!’ Rin whined. His hips were making little involuntary movements
as if he was trying to get some friction from the air. But of course it was not
working, and Rin’s look turned more glazed and more desperate every second.
There was only one thing they could try now, Yukio thought. If he just made Rin
lose all that semen he had inside him, the abnormal erection would have to go
down. And Yukio was quite sure he recalled the procedure for that.
‘Nii-san, listen. You have to trust me. It’s going to feel a bit weird, but it
will be for the best. Just don’t worry, I’ll take care of everything!’ Yukio
said as much for Rin’s benefit as for his own, to calm down his nerves.
He stepped away and rummaged in the box with medical supplies, ignoring Rin’s
pained whimpers. Finally he located something more or less suitable and went
back to the bed. Rin looked even worse now, trembling all over, his T-shirt so
wet with his sweat it looked nearly transparent, his cock twitching and red. A
picture of completely mindless lust. Yukio bit his lip. He had never thought of
his brother in sexual terms before, but now he would be forced to rethink his
attitude. But it was no time for reflection.
Yukio crawled up on the bed and settled between Rin’s spread legs. He unscrewed
the tube of muscle relaxant and squeezed some on his fingers. He looked at his
brother’s genitals, not sure how to proceed. But it seemed to be quite clear
what to do – Rin’s balls were tense and drawn up and his spread legs offered an
unobstructed view of his wrinkled asshole.
‘Now just relax, Nii-san,’ Yukio said, feeling very tense himself. Still, he
did not hesitate and brought his ointment-covered finger in direct contact with
Rin’s hole.
‘Yukio, what..?’ confusedly asked Rin. It seemed that the cold ointment let him
return to his senses a little.
‘Just relax,’ repeated Yukio and circled the elastic ring of muscle. It felt
less tight than he suspected it would be, those multiple orgasms must have had
quite a relaxing effect. He did not waste time and effortlessly slid his finger
inside his brother’s body. It felt hot, unexpectedly hot. Yukio tried to
remember the anatomy lessons and locate the prostate, but it seemed to be
elusive. Yet Rin didn’t mind, he was mindlessly mumbling about how good it
felt, and how he wanted Yukio to go deeper.
Yukio understood that himself. He pulled the finger out, ignoring Rin’s
protest, and drizzled some more ointment on his hand. And then he pushed back
with two fingers. Now he was able to go deeper and inspect his brother’s
insides more thoroughly. At last he felt a bump inside his brother’s tight, hot
passage and, judging from how Rin screamed, it was the prostate. Yukio massaged
it in gentle circular motions, willing himself to think of it as a purely
medical procedure. However, it was quite difficult to ignore Rin’s sexy moans
and whimpers, and Rin’s look of absolutely sinful debauchery. Yukio was
starting to feel affected, but he decided he could always take care of himself
later, Rin’s problem was much more urgent. Rin’s cock was continuously
dribbling precum, and Yukio exerted a little more pressure on the prostate.
‘Yukio, touch me, please!’ Rin begged. Yukio smirked. It was kind of fun to see
his usually so brash brother reduced to a whimpering lusty mess.
‘I already am touching you, Nii-san,’ Yukio said. Rin bit his lip and once
again jerked his hips, making his stiff cock bob in the air. Yukio understood
that the erect organ was the place Rin wanted to be touched most, but rubbing
it so much could not be healthy, this time he wanted Rin to come without
touching his penis.
It didn’t take long – Rin moaned agan, and this time his cock spurted semen
instead of precum. Yukio was surprised at the force of the ejaculation, it
nearly hit his glasses, he got out of the way just in time.
‘That should take care of it,’ Yukio thought, pulling his fingers out of his
brother’s stretched hole and getting up. Now, if only there was someone to take
care of him – his own dick was throbbing with need. Yukio hated to admit it,
but he got really turned on by the whole situation. That probably made him a
horrible person, but right now his cock was worrying him more than moral
issues.
A sob distracted him from reflections on his erection. He looked at Rin again,
and was startled to see that tears were flowing down Rin’s cheeks. ‘It still
hurts, Yukio,’ managed Rin. Yukio looked down at Rin’s body and indeed, Rin’s
dick was still stiff.
‘Well, crap,’ thought Yukio. He was normally against strong language, but in
situation like this, there was not much else to say, really. He only had one
last resort left. He really, truly did not want to have sex with his brother,
or at least he had not wanted to before. But now it was the only option. Yukio
resolutely unzipped his trousers and pulled out his cock, almost as red and
swollen and dripping as his brother’s. He approached the bed again and spread
his brother’s legs. Rin did not resist or even react, he was too far gone. His
anus was wet and stretched and looked very inviting indeed.
‘Here goes nothing,’ thought Yukio, got on the bed and plunged his stiff dick
right into Rin’s slick hole. Both brothers moaned in unison. Yukio had never
felt anything that amazing, and Rin was finally feeling full and stretched and
getting some relief from pain.
Yukio thought of going slowly and carefully not to hurt his brother, but he
simply did not have the strength of will for that – the tight hold of Rin’s
body on his dick felt simply too amazing. Yukio fucked his brother as fast as
he could. Judging by Rin’s pleasured moans and whimpers, and by how he tilted
his hips to get more of his brother’s cock inside, Rin did not mind in the
least, either.
Soon Yukio felt pressure build inside him. He had the presence of mind to grab
his brother’s dick and stroke it in time with his movements inside Rin’s ass.
Rin screamed and came all over Yukio’s hand again, passing out immediately
afterwards. Yukio could not help but moan, too – Rin’s body squeezed him
impossibly tightly, even when Rin was unconscious. Yukio came with a groan and
pulled out.
He flopped on the side of the bed and lay there, breathing heavily, watching
his sperm drip out of Rin’s stretched hole and waiting for horror and guilt to
kick in. Somehow, they did not – after all, it was all just a medical
procedure. He got up shakily, wiped his hands and dick with a tissue and zipped
up his trousers neatly. Now it was time to clean up poor Rin – he looked like a
complete mess. Yukio really hoped that his brother would not remember much when
he woke up.
Unfortunately for him, Rin did – and demanded a repeat performance. But that is
already another story.
 
The end.
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