Posted originally on the Archive_of_Our_Own at https://archiveofourown.org/
works/3757588.
  Rating:
      Explicit
  Archive Warning:
      Underage
  Category:
      F/F, F/M, M/M
  Fandom:
      Ao_no_Exorcist_|_Blue_Exorcist
  Relationship:
      Okumura_Rin/Suguro_"Bon"_Ryuuji, Okumura_Yukio/Shima_Renzou, Moriyama
      Shiemi/Kirigakure_Shura, Mephisto_Pheles/FemOC
  Character:
      Okumura_Rin, Okumura_Yukio, Mephisto_Pheles, Suguro_"Bon"_Ryuuji,
      Moriyama_Shiemi, Shima_Renzou, Kirigakure_Shura, Amaimon_(Ao_no
      Exorcist), Ukobach_(Ao_no_Exorcist), Takara_Nemu, Miwa_Konekomaru, Kamiki
      Izumo, OCs
  Additional Tags:
      Mating_Cycles/In_Heat, Bonding, Betting, Promises, Rin_forgets_a_lot,
      then_he's_better, Maybe_HAppy_ending, Fluff_and_Smut, and_then_they
      fucked
  Stats:
      Published: 2015-04-16 Chapters: 2/? Words: 2361
****** Of Pain and Pleasure ******
by Narumina12
Summary
     Bon gets worried about Rin after no one knows where he is one day and
     goes out to find out what's wrong. Unfortunately puberty isn't
     treating Rin too well, and leaves him in such pain that he can't even
     remember his rival. Rin has a week to remember Bon or he might go
     insane with lust for the skunk-haired teen. BonxRin.
***** Chapter 1 *****
"Where is he?" Ryuji growled as he glared at Rin's usual seat in the class.
"Well maybe he's just taking a sick day." Shima suggested.
Bon turned to his friend, "I'm considering it, but he normally tells Moriyama-
san. She doesn't even know!" Ryuji growled once again. His friends sighed and
couldn't help but laugh. He was always like this since the accident at Kyoto,
Ryuji had come to like the kid. At times it was more of an obsession.
"Well maybe Okumura-sensei will know when he gets here?" Konekomaru said
calmly.
It didn't take too long before Shura came in with a tall man with red hair,
"Alright Exwires. Since th' spotty four eyes has to take care of his idiot
brother, Simba here will be taking care of ya." "Shura-san that's not-
" "Anyway, he's an expert doctor from America so be nice to 'im!" Shura let out
a growl before storming out.
The new teacher sighed, "There was a lot of misinforming there... For starters,
my mother was American, my father was Scottish and I was born in Japan. My name
is Alex MacJenner. I am indeed a doctor, but hardly expert, I'd say the same as
Okumura-san. Now, would anyone be willing to help tell me where he left you all
left at?" Shiemi raised her hand and he nodded as she rushed over.
Ryuji was in the back fuming and growling, "That bastard!" His hand shot up and
Alex saw him.
"Yes, blonde streak, tell me your name then ask your question."
Ryuji stood up, "Suguro Ryuuji, I was wondering what was wrong with Rin?"
Alex's face almost turned as red as his hair, "Well, it's not harmful to him,
but it is... extremely uncomfortable of a time for demons. He will be in
isolation for the next week or so with a few exorcists guarding his room."
Ryuji sat down in confusion, a time that makes demons incredibly uncomfortable?
He knew that there were a few that did that, but he also knew there were more,
plus there were certain times that were specific to the species. Be it
shedding, molting, birthing, sometimes even just feeding. He knew there were
more, some that were only known by the Paladin, others that he just hadn't been
taught yet. Ryuji growled in frustration yet again.
---------------
Ryuji stood in front of Rin's dorms with a bag of pillows and a blanket for
him. There then came a long pained growl from somewhere in the dorms. The door
to the building opened and Ryuji darted to the bush.
Yukio came out of his shared dorms with Rin with sweat on his brow. Subduing
his brother to the point he wouldn't attack anyone was difficult. It hurt him
to watch Rin whine and growl in such pain, but he knew that it would do him no
harm in the end, he set aside those feelings and had Rin tied down. Yukio
pulled out his cell phone and called their guardian Mephisto.
"Moshi moshi?"
"Nii-san has been subdued, we tried giving him a sedative so he could sleep the
pain away but it had no effect."
"Well of course, it takes more then just a few elephant tranquilizers to put
even the bastard son of Satan to sleep."
"I know, is it normal for him to scream so much? Three women and a man just
about gave in, when they were pulled away he screamed even louder."
"Yes, well he did just get his first one, so it's bound to be painful. Whenever
a demon fails in seducing someone it's almost like a stab to the heart. So
he'll be screaming for a while."
Yukio sighed, "I'll find somewhere else to sleep then." He hung up his phone
and walked away.
Ryuji heard everything, but things were still not piecing themselves together.
He's in lots of pain, but it's not fatal. He tried seducing three women, and
one man. He was considering just leaving a note on the bag he brought and just
leaving it for someone else to find but he was afraid that no one would come by
to see it.
Ryuji went against his better judgement and walked into the building
cautiously. He followed the sounds of whimpers and growls to find Rin tied to
his bed.
Tears were streaming down his face as he growled in discomfort at the pain that
was slowly growing. But he caught a whiff of a sweet, yet slightly salty scent,
one he wanted more of.
"I- uh, brought you some stuff." Rin turned to see Ryuji looking at him in
embarrassment and pity. "They were really vague on what happened to you, so I
just brought some extra pillows and a blanket."
Rin almost melted, he didn't remember much he was in so much pain, but just
talking to him helped to put it on the back burner.
"Thanks." his voice was sore from growling and screaming so much it sounded
like a whisper.
Ryuji scoffed, "Do you even know what is wrong?" Rin shook his head, "Typical,
well if you can tell me what you feel is wrong maybe I can help?"
Something inside Rin snapped, the pain disappeared and he was calmer, he even
smirked at Ryuji, "Really now? If I said I wanted you to suck me off would
you?"
Ryuji's face turned red, he was taken aback by the other's perverse remark,
"What the hell Okumura?! I'm trying to help you get rid of your pain and you
say that?! That's disgusting!"
Rin frowned as a twinge of his pain returned, but continued, "I'm serious, that
really would help. Maybe a nice fuck too."
Ryuji growled, "Okumura, your definition of serious must be much more different
then mine. I'm not gay!"
Rin returned the growl as another twinge appeared, "That doesn't matter to me!
I'm so horny it hurts alright?! Of course you normal humans wouldn't
understand!"
Ryuji raised a brow, "Normal humans? Rin what's my name?"
"How am I supposed to know!? I can hardly remember who I am I hurts so bad!"
"When you can guess my name, I might consider it, you'll have three guesses
everyday. Whenever you guess wrong all three times, I'll leave, if you so
happen to guess right, I'll," Ryuji took in a sharp breath, "Do whatever makes
you feel better."
Rin narrowed his eyes, "Fine, but before you go everyday you have to kiss me so
the pain doesn't get worse."
"That's not part of the agreement!" Rin grunted in false pain and began to
growl. The older panicked, he didn't want the other to hurt worse then he
already did, "F-fine, I'll kiss you, god."
The older leaned over the younger and pressed his lips against Rin's. They were
soft and full, and he became intoxicated at the concentrated scent coming off
of the other. He pressed a little deeper and enjoyed the feel of his lips. Once
Ryuji realized what he was doing he pulled back in a rush with his face beet
red.
Rin smirked as he ran off, he licked his lips. "Hmm? This may turn out to be
easier then I thought."
***** Chapter 2 *****
Research was the least of anyone's worries. Minus Ryuji's at the moment. He had
to find out if there was anything that could help Rin, other than... their
deal. Desperation came easy and caused his nerves to wind up in a little ball
and bounce around in his head. He really didn't want to do THAT with Rin if he
didn't have to. Research lead to nowhere quick and without anymore books to
read about this subject, he gave in. The ball unwound, little by little as he
laid his head on his pillow. He owed a lot to Rin, and they were just starting
to seem like friends. Then Rin had to start... ovulating of all things.
Ryuji sat up in his bed. He assumed Rin was a male... but demonic sexes are
different from human... and just because Rin is strong, that doesn't mean he'll
be the "man" in the relationship! The teen nearly gagged a bit at the thought
of Rin, possibly pregnant. But then he remembered Rin's cooking ability and way
with children and rationalized the possibility. It was disgusting, but made
enough sense to switch paths of books. He picked up a book that was thick and
covered with dust. The dust blew off and, the title seemed too cutesy to be a
scientific document of Demonic reproduction. He sighed and opened to the table
of contents of Your Demonic Baby and You. The very first chapter was what
covered the symptoms of a mating season. Ryuji found Rin's symptoms and
groaned.
Nothing. All he could do for Rin was wait. But, well... there was one hope...
Apparently, Rin attempts to seduce a lot of people, during this period he can
track and study a person by their body language and movements, just to find a
suiting way to do so. Only people that he can't study in an instant could make
a good lifetime partner for him. Someone he has to watch and learn from for
years before erecting a bond and being able to use that person to take care of
him, for whenever he gets like this.
There didn't seem to be anyone like that so far. Ryuji gave up once more and
fell asleep.
--------------
Class went as normal, and Alex was still teaching them. He was given clearance
to tell the others what was wrong with Rin, and a warning to not even try to go
visit him. Ryuji scoffed. Class let out and he picked up a small book about
dealing with female demons. He walked in an opposite direction than normal, not
going unnoticed by his friends.
"Hey, Bon, the dorms are this way." Shima yelled.
"I know, I have something to do," he yelled back.
The pair ran towards him, "Where are you going?"
"To see Rin."
Konekomaru's eyes widened, "Bon, we were told not to!"
"And? I've already gone to see him. He's not that dangerous. Just... stupider."
"Bon, he's desperate to mate with anything. He'll do anything to get in your
pants." Shima was looking worried.
"I know, I've been there. He didn't try anything with me." A lie, but
necessary, they didn't need to know about the deal. He continued down the hall
until he came out of the door under the bridge to Rin's dorm. Sneaking past
Yukio was easy, and climbing into the room was even easier.
Rin was asleep, passed out from screaming and growling so much. Ryuji couldn't
just leave though. A deal is a promise with consequences. And one that he made
to a friend. So he waited, until Rin's eyes fluttered open almost half an hour
later.
"Hey." Ryuji said as he read. "you ready to play?"
Rin looked confused, "play what?" Of course... if he can't even remember his
name, what made Ryuji think he could remember five minutes of yesterday, most
of which he spent screaming and trying to seduce people!
The teen sighed and put down his book. He leaned over and put his head in his
hands, berating himself for not remembering that.
Rin saw the blonde tufts and laughed, "Oh yeah, our little deal from
yesterday." Ryuji looked up, slightly confused. "I just have to guess your name
right?" The other nodded. "Umm... Sukiyaki."
"No" slight disgust showed on the human's face at being guessed as a food.
"Takoyaki?"
"There's no 'yaki' in my name." he growled.
"...Kusomajime."
"WHAT?! WHY DO YOU THINK MY NAME IS KUSOMAJIME?"
"Your face is always so scrunched and angry looking."
Ryuji growled, "That's three strikes. You're out for the day."
"WHAT, NO, I WANT MORE GUESSES THOSE DON'T COUNT."
"THEN YOU SHOULDN'T HAVE BEEN NAMING OFF FOODS AND INSULTS."
"I'M SORRY, I'M JUST HUNGRY!" Rin whimpered a bit as his stomach growled to
emphasize his point.
Ryuji sighed and pulled out a box of pocky from his school bag. "I thought you
might have been. I'm not giving you more guesses, but I will give you something
to eat."
He gave him a stick and Rin bit it in half, letting the rest of it fall. Ryuji
sighed and gave him the other half, and another stick. This continued until the
pair had eaten them all. "It's not much, I can try to bring you more tomorrow."
Rin seemed to purr contentedly.
"Thanks."
Ryuji got up from his side of the room and started towards the window, "are you
forgetting something?" Rin asked with a smirk.
The human sighed and walked over to Rin and kissed his cheek. "Noooooo, i can't
just have a little cheek peck!" he whined. Ryuji went down to his lips and
pecked them like he did with his cheek. Making Rin pout more. "Give me a real
kiss!" Once more, Ryuji kissed Rin, but this time, stayed long enough for in to
suck on his lip for a moment, before the free one pulled away with a red face.
Ryuji rushed out of the window with a quick goodbye, leaving Rin to smile and
lick his lips happily. Remembering the kiss constantly, and fondly.
----------
Ryuji's roommates didn't question his lateness, nor paid him any mind. The luck
of not having to share a room with his friends played out more and more with
the course of events. He crawled onto his bunk, only to find a girl there with
swirling blue hair and deep blue eyes.
"Who're you?" he asked. She smiled and did not reply, merely sitting up for a
moment to pull him closer. His roommates were asleep in their bunks and some
strange girl just came into their room and sat on his specific bunk.
She kissed him and purred happily, before cuddling to his side. Ryuji couldn't
move, she was a beautiful girl, but he couldn't let that distract him, he had
reading and research and... memorizing... to do...
Before he knew it. The sun shone in his window. The girl was gone. but after
asking around his roommates: she was never there.
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