Hiya everyone! So I decided to try my hand at writing an Ao No Exorcist/ Blue Exorcist Fanfic. This is my first attempt so let me know what you think. DISCLAIMER: I do not own Blue Exorcist all rights go to their respected owners, I only own the ideas so please enjoy!

I recently came up with this idea out of nowhere. I was kinda curious what would happen if Rin was unable to sheath his sword so this is what I thought. There are a few references to chapters from the Manga I don't know if all the info is accurate since I haven't read it in awhile but anyway hope you like it!

Chapter 1: Missing Sheath

It had been a very tiring day. Tired was putting it mildly. Everyone especially Satan's son A.K.A Rin Okumura knew this to be true. The whole entire day had been spent putting up barriers and fighting large swarms of demons that seemed to appear instantaneously and without warning. What started out as a simple training exercise to get the exwires field experience turned out to be more than that. Out of nowhere demons appeared left and right and all the exorcist cram school students were left to fend off these large swarms no thanks to their teacher Shura Kirigakure who was suppose to watch the students in Yukio's stead while he went out to investigate the cause. He left specific directions that the students were not to leave the barrier and THE STUDENTS WERE NOT TO LEAVE THE BARRIER. Rin offered to go with Yukio but Yukio being the stubborn twin only scoffed then left. Turning to face his older brother and point a finger as a warning.

"I'm serious Rin. Do. Not. Leave. The Barrier. GOT IT!" Rin sighed in defeat. His brother was always going off and doing things on his own and a lot lately. He was too stubborn for his own good.

"Yeah, yeah I heard you four eyes." Rin rolled his eyes in an irritated manner. Yukio was getting on his nerves with all of his go-off-by-himself-I'm-smarter-than-you act. Lately, ever since that incident a couple of months back with the Impure King Yukio had been acting different. His behavior was getting even worse now. He even got into a few fights with Rin back at the dorm even though Rin hadn't really even said anything to start it.

Rin began walking out toward his brother before a hand stopped him. It was Shura.

"Didn't you hear what ol'four- eyes just said about leaving the barrier?" She scowled.

"Yeah but…" Rin didn't get to finish his sentence. Shura places a hand on his back and pushes him towards the group of exwires. He couldn't help but continue to look over his shoulder as he watched Yukio disappear into the darkness. Rin felt a sudden urge to dash back towards Yukio's direction despite his teacher's warning however he did not. He walked sullenly towards the group glancing back every so often. He kept getting this weird feeling almost like someone was watching them when he suddenly heard a noise. Rin shot his head up and looked around like a lost animal. No one really paid much attention to him except for the always pissed off looking aria- in-training Suguro.

"Hey Okumura! You look more brain-dead than usual." Rin glared at the teen with daggers.

"Yeah well your hair still looks like a chicken ass." He casually walked off leaving a fuming Suguro. But even Suguro wasn't stupid he knew there was something wrong with the older Okumura. If it wasn't apparent at first glance then the movement of Rin's tail said everything. It wagged side to side in slow motions. It always amazed the aria how easy it was for him to tell Rin's mood by the motions of his tail. By the particular movement he saw right now he could tell that either something was troubling the distracted teen or he was irritated or a combination of the two. He had a feeling it was the latter. Rin's familiar Kuro followed close behind jumping up to play with his tail swatting at it with his paw. The little black cat stopped when it noticed that its master didn't look like he was in any mood to play.

Suguro just watched in silence.

Then without any warning the ground suddenly started to rumble and quake. All the exwires pulled out their weapons readying themselves for the next swarm of demon's they were sure were coming.

"Al'right everyone get to yer appointed positions!"

Shura shouted. The exwires all ran to their spots prepared for hell. Instead of offering to help, Shura perched herself in a high tree and watched from a distance spouting orders left and right while she drank her alcohol. Of course by this time everyone was exhausted and about ready to drop dead. Rin fought off large swarms by himself while his classmates fought the others. The arias in the class chanted sutras while the tamers called their familiars to help fight. Even Rin's cat sithe familiar pitched in to fight. Rin was told before the exercises that he was not to use his flames for any reason whatsoever. Reluctant Rin complied, even though he had trouble finding an alternative way to fight off these demons. With his sword still sheathed he used the hilt of his sword to push back the demons that got too close to the barrier. All of the students agreed it was pretty stupid for Shura to demand that Rin not use his flames which could make exterminating these swarms ten times faster. Suguro with his chicken-ass hairdo glared at the blue-black haired exorcist in irritation.

"Okumura!"

A very pissed off aria yelled. Rin at the mention of his name turned to face the ticked off teen.

"The hell do you want!?"

Rin yelled trying to push back a giant hobgoblin which had him pinned to the ground. The teen struggled against the giant monster using all his might to throw it off him with no success. Unfortunately he couldn't depend on Kuro right now since Rin had asked him to help the others. The giant hobgoblin snarled and tried to bite him but he blocked its attacks with his still sheathed sword.

"Why don't you just unsheathe the damn Kurikara and end this already!"

Rin only sighed in irritation. He would love to do that more than anything. If he still had the same mindset he had a few months back he wouldn't have hesitated, unfortunately as he had been warned by Shura he was on death row and if he made one more mistake and was seen the Gregori would not hesitate to end his life early. At that moment he thought of all the things he would be leaving behind should he be seen again. School, his friends, and what about his little brother Yukio? How would he feel about not only losing his father but his brother also just because he decided to be an idiot and unsheathe his sword just to clear out a few swarms of demons. He did not want to take that chance.

Suguro on the other hand took Rin's silence as not listening to his question.

"Okumura did you hear me!?" the teen yelled louder this time hoping that he would get some sort of answer.

"A dead person could hear you, you asshole! Did you forget in that chicken-ass head of yours that I'm on death row? One mistake and I'm maggot feed!" Rin finally managed to fling the huge goblin off of him hurling it into a nearby tree which broke like a small twig. Before Rin knew it the damn thing came rushing back at him with full force as if it hadn't just gotten its head smashed in by the impact. "You've got to be fucking kidding me!" Rin yelled. Before the goblin got close to him it suddenly vanished. Rin looked up in confusion then turned to face the still angry teen who continued to chant calmly despite his pissed off appearance. Rin knew by the look on his face that that was his nice way of saying "You're welcome…asshole." Rin just sighed in relief then looked at the scene around him. Demons were coming from every direction. The purple haired tamer Izumo was using her two foxes to fight the demons coming from the south with the help of the blonde haired Shiemi, the pink haired Shima and bald monk Konekomaru were fighting the demons from the west, suguro fought the ones coming from the north and Rin and Kuro fought the demons to the east. By the way things were going it would be an eternity before they cleared out all these demons. Rin knew that there was no way to stop this without using his flames but still he felt uncertain.

He looked up again facing Suguro who this time held up a sketch pad with pictures of what looked like Rin unsheathing his sword and kept flipping the pages so that a small movie played with the sketches. Rin knew Suguro was right. This was not going to stop unless he did something. He wished more than anything that Yukio was there or that Shura would finally get off her lazy ass and help but he knew it would be a cold day in hell before she lifted a finger. Any doubt he had vanished the moment he heard a scream. Shiemi's scream. A high level Niberius had somehow made it through the barrier and was dragging the young girl by the legs out of the circle on the ground. That was it. If he waited any longer for Yukio or Shura his friends would surely die.

Feeling the all too familiar rage building within himself Rin yanked the sheath off his sword tossing it to the ground in frustration. The blue flames flickered to life igniting the flames on his head and his tail. His long tail lashed out wildly clearly showing the teens anger with each movement.

Rin heard the scream again. By this time the demon almost had her completely dragged out of the circle. Everyone else was too busy fighting to aid the helpless blonde. Shima tried throwing his staff at it but it bounced back. The Niberius shot a huge gust of wind his way knocking the pink haired teen back. Rin rushed over with speed he didn't even know he had and jumped onto the Niberius's head stabbing the Kurikara right through its head and sending a big burst of flame shooting upward. The girl finally being freed from the monster's grasp picked herself up off the ground with the help of Shima and Koneko who had been blown back by the Niberius. Rin jumped back onto the ground and ran to the opposite end of the circle (which was freaken huge) where Suguro was still chanting but he seemed to be slowing down slowly but surely. It was obvious that any minute the aria was going to pass out from exhaustion. The teen flew past the aria in a blue blurr nearly knocking him off his feet. After he composed himself he continued to chant sutras while Rin annihilated every last demon nearby. After Rin was sure he had gotten them he then ran to the next location then to the next until there were literally no demons present. All that was left was the faint smell of burnt flesh.

Feeling that it was finally over he finally fell onto his back huffing from the overuse of his flames. Everyone else felt relief and fell to their knees exhausted. It was finally done. Now all they had to do was wait for Yukio or Shura to tell them that training was over. For today anyway.

Rin went to sheath his sword but realized it wasn't with him. That's right. He had taken it off and threw it earlier. Rin realized that was stupid on his part because he's not usually that careless.

"Crap."

Rin's legs felt like jell-o and his lungs felt like they were on fire. He had only over used his flames one other time, when he fought the impure king. That left him in a coma for three days. This time he had almost used as much power and he was sure if he passed out he would probably not wake up for days. With what little energy he had left he got up and walked over to the place where he was sure he had seen it last.

That meant it should be where he fought the giant hobgoblin. He walked over slowly tired and exhausted to the place where his sheath should be, but wait. Where's his sheath?

DUH DUH DUH!

I will be posting chapter two shortly after all the boring ass introductions are done so be patient and you will be rewarded with CANDY! Lol jk. Anyways thanks for reading!