Welcome to the sons of Satan fic! This is my first time writing a blue exorcist fic, and i'm honestly excited. I've had this idea for a long while, but i couldn't do it because I've been busy with my other fic, and school, but i managed to get a friend on board and this fic is finally becoming a reality!

As it says in the synopsis, this will be an AU fic, and a multi chapter fic as well. How long will it be? i'm not really sure, but i recon it's gonna be a decent length.

Now as for the full synopsis, here it is: As Paladin, and as a friend of Yuri Egin; Shiro Fujimoto took it upon himself to raise both her orphan sons, as normal human beings. Unfortunately for Shiro, the Illuminati had other plans. As his last deed in Assiah, Lucifer captures the infant Rin and drags him to Gehenna. Fifteen years later, Rin returns to Assiah under strict order form Satan, to fight the exorcists alongside Lucifer. Rin has no problems with following these order, but when he comes face to face with his twin brother, he finds that it's not as easy as he thought it would be.

So i hope you'll like this fic, as much as i liked writing it. Now of course, i don't have the right for Blue exorcist, and this is simply non profit fic.

Now read on, and hope you like it.

Chapter 1

Worlds apart

Yukio pulled the trigger of his pistol without so much as blinking. In less than a second the holy bullet shot through the barrel, and stayed true to its intended course. Yukio's hand didn't so much as move from the recoil of the gun, nor did he flinch when the bullet penetrated the skull of a goblin clean through, just before it came to contact with him. The shot was perfect –as always- and, clean. However, the death of the goblin was anything but, as it blew up into smithereens, it's remain spluttering to the ground, and dirtying the ground… not that the ground could get any dirtier.

He was in a dingy, disgusting alley after all, only a few kilometers away from the church. The reason why he was here was because his father got a call from the higher ups telling him that there was a nest of goblins that had recently moved into this part of the city. It was a menial job, something even the lowest of the low exorcist could do, but his father had insisted that he go. He wasn't prideful, or think himself above such trifle tasks, but he would be lying if he said he enjoyed being outside in the middle of the night, in the cold. He liked exercising don't get him wrong, but he liked sleeping in his comfortable bed even more.

Yukio sighed, and reloaded his guns with ease and expertise that could only be achieved after years of training, and practice. As he reloaded his gun, he made his way deeper into the alley. He wanted to exterminate all the goblins as cleanly, and quickly as possible so that he could go home, and into his comfortable bed. That was mostly wishful thinking really; he knew it wasn't going to be that easy.

Goblins are one of his least favourite low-level demons barely beneath ghouls, and that is due to the sheer size of their nests, and the annoying way they hid from exorcists. Goblins were annoying, and time consuming to exterminate, and his current predicament proved that! He had just spent over an hour searching for the nest, and exterminating goblins along the way.

For these reasons, Yukio hated goblins. In fact he preferred higher level demons, because they tended to be low in numbers -sometimes being by themselves- and they tended to face exorcists without fear. This willingness to fight exorcists made it easy for them to kill them without having to chase after them, but it also made it incredibly dangerous for the unlucky humans that came across them.

Yukio sighed once more, and he looked around every corner of the alley as he passed through. His pistol was clenched in one hand, ready to fire if a gobbling sprang out of nowhere. He was a little tensed as he waited, but after almost a minute of not spotting any goblins, he thought he might be in the wrong place. He was certain that he followed the trail correctly, and that this is where the nest had to be, as well as the king.

Making sure that he hadn't looked over anything, Yukio lowered his gun, and looked behind him the entrance of the alley, and from where he came, nor spotting any goblins as his eyes inspected the path.

'Maybe they all left?' He thought to himself, but even as he thought that, he knew he was wrong. Goblins very rarely left their nests once they acclimated to their new homes, which only left one explanation. The goblins were bidding their time, and probably hoping that he either pass by them, or ambush him.

At the thought of an ambush, Yukio's grip on his pistol tightened. As if on cue, a loud bang came from behind him, and Yukio snapped from his thoughts, and jerked his head back. A rather large goblin was quickly running towards him. The goblin had its eyes dead set on him, as he leaped in the air towards him.

Without batting an eye, Yukio brought his pistol up, aimed it at the goblins head and pulled the trigger just when it was in range. The goblin exploded, and its remains splattered messily across the alley, but not a drop landed on him. Yukio lowered his pistol slightly, after not seeing any more goblins, but then out of nowhere several loud bangs went off, and a horde of ten goblins sprang out of garbage cans, and boxes and they all quickly made their way towards him to attack all at once.

In other person -even low ranking exorcists- would have frozen on the spot, there were just too many goblins closing in on him, but Yukio's simply furrowed his brows in concentration. There were too many goblins coming his way to simply shoot them all, even though it would be more impressive and exhilarating, Yukio knew his limits. Without wasting time, he reached for the pouch on his hip, and took out a holy water grenade. Without looking back, he expertly popped the cap with one hand, and threw it at the small group of goblins. The grenade flew in the air towards the goblins which they paid little attention to. But as he saw how fast they were gaining ground Yukio soon realize it wouldn't detonate fast enough to kill the goblins before they reached him. Yukio raised his gun, aimed it at the grenade and pulled the trigger. The grenade exploded, shrouding the alley in mist of water. When the water hit the goblins they shrieked in pain, and quickly exploded. The remains of the goblins shoot through all directions, hitting everything in sight.

Unable to move away fast enough, Yukio put his arm in front of his face to cover his head from the splattered remains of the goblins, leaving the rest of his body unprotected. After the remains of the goblins landed on the surfaces, and he was sure nothing remained, Yukio put his arm down and grimaced when he looked down at himself. His uniform was completely stained and dirtied by the remains of the goblins, not to mention that it stink. Yukio grunted in exasperation, and disgust- so much for keeping his uniform crisp, and clean, now father will be mad for his carelessness.

Yukio shock his hand, shaking the gunk off his hands as well as his clothes, but it did very little to get the stains out. Yukio continued to shake his arms with vigour, unaware of the large goblin lurking behind him -or so the goblin thought.

The largest, and last remaining goblin jumped out of his hiding spot, and to where Yukio stood. Its teeth's we're bare, and its arms were prepared to grasp the body of the exorcist before him, unaware that he knew he was right behind him.

Yukio raised his gun on the last second, and shoot a bullet straight through the goblins arm, without even looking. The goblin gave out a loud yelped, and fell to the ground with a soft thump. Yukio turned around, and looked down at the injured -and still alive goblin- in annoyance. Not killing the goblin had been a deliberate choice of course. He knew that goblins were incredibly protective of their king, and would come out of their hiding spot in order to protect their king, which is what he was counting on. But by the small size of the goblin -even though he was larger than a normal goblin- he knew this had to be a a very young king, and therefore have a very small nests, and seeing as no other goblin came for his aid, it was clear to him that all other goblins were dead.

The goblin tried to drag himself away from Yukio, and made a fearful growling sound as it tried to get away. If this had been Yukio's first time encountering a goblin, or fighting demons, he would have felt sorry for the poor thing, but after years of practice and conditioning, he no longer felt sorry for them; that did not mean however, that he was merciless.

Yukio raised his pistol at the goblin, and aimed it at the goblin to end the poor demon's misery, but just as he was about to pull the trigger, an odd feeling overcame him, seizing him and freezing him on the spot.

The lights in the alley flickered, and a gust of wind passed through the narrow buildings, blowing leaves and debris across the alley, and hitting Yukio, who put his arm up to protect himself from the debris.

When the wind dissipated, and the light stopped flickering, Yukio looked up at the bright full moon, and he got an overwhelming feeling of forewarning. He couldn't explain it, but he got this horrible feeling that Something was about to happen, something that would have warning signs written all over it, and Yukio felt his heart drop even though he didn't know why.

A harsh cackle like sound came from behind him, and Yukio jerked his head down to look at the goblin king. The injured demon laid on the ground, with dark blood like liquid oozing out of its arm, the thing was no doubt at death's door, and yet it was giving Yukio a look he could only describe as a mocking smile.

Annoyed, and ready to put it out of its misery, Yukio pulled the hammer of his gun back, and readied to pull the trigger. But despite holding a pistol at its head, the goblin kept giving him the same mocking expression. A moment of silence passed, which was broken by goblin king made the same obnoxious yapping sound, and Yukio grimaced. Without warning Yukio pulled the trigger and deliver the final shot. The goblin blew up, and Yukio put his gun away knowing that there were no more threats around, and yet the same feeling of unease remained.

Yukio didn't stand by and risk getting attacked by another demon, so he walked out of the alley, while his mind was deep in thought. What was that feeling he got a few moments ago? And why had the damn goblin act so strange? He had never heard of accounts of goblins laughing, or mocking an exorcist. They are the lowest form of demons –or at least one of the lowest- and don't really have the capability to from coherent thoughts, and emotions, heck even the highest level of demons have problems with emotions, so why had this goblin appear to mock him? Did the goblin know something?

Yukio sighed. Looked at him? Thinking that a goblin could have such ulterior motives, or intelligence, surely if his father saw him he would smack him just for being an idiot. He didn't know why he felt so uneasy, and he really couldn't find out, but one thing was for sure, not only was this night weird, but something was definitely up.

Just then, a gust of wind blew through the alley once more, almost knocking Yukio over with its force. Once more the feeling of forewarning returned, and Yukio took his guns out without even knowing why, or thinking about it. Yukio pointed his guns at both sides of the alley, waiting for an enemy to surface.

He gripped his pistols tightly, and he looked from one side of the alley to the other, ready to shoot if anyone so much as peaked their head into the alley. He didn't understand what was going on, but he wouldn't be caught off guard, if a demon was here to attack him, then he would meet the challenge.

Minutes went by, and no demon made an appearance. Thinking that he was just being silly, Yukio huffed and put his guns away, but the strange feeling did not go away. Yukio looked up at the moon once more, almost as if it would provide answers to his questions.

Something was definitely happening, and he didn't know what it was, but he knew it couldn't be good.

Everything was so incredibly cold; that was the first thing he noticed. His entire body was shivering. His hands were shaking, and his teeth were clattering from the cold, but the worse was his feet and knees, which were weakly planted upon a very strange, cold, hard surface he had never felt before. The next thing he noticed was that everything was too unbearably bright. His eyelids were tightly closed shut, but he could still see the unnatural brightness through them, and it still annoyed him. The third thing he noticed, was right after he took his first breath. When the air passed through his throat he almost choked. His lungs felt like sharp knives were penetrating his skin, rather than air, it was awful and painful, but he couldn't very well stop breathing, so he had to live with the pain.

Through his quick analysis, Rin knew right away that he was -indeed- no longer in Gehenna, but in the unknown world on Assiah.

Of course he knew he was in Assiah, for that was where he was sent to, but still a part of him couldn't quite believe, and comprehend the strange new world, and that was due to his physical body.

With his mind finally making the connection that he did, indeed have a body, Rin tensed up. He never had a body before, Gehenna is an immaterial world and therefore its populace was devoid of physical bodies. Rin had never understood how the material world of Assiah worked, or why so many demons were obsessed with possessing a body, and going back to Assiah. But not that he was in Assiah, and with a body of his own, he could understand the obsession a little bit more.

Testing out his new body, Rin wiggled his feet, and clenched and unclenched his hands into fists. He moved his ears around, to pick up strange waves that were called sound, and grimace from the loud humming sound, as well as others sounds he didn't understand. Everything was so strange to him, nothing made sense, and when he breathed in air through his nose, the different odours around his were overwhelming… everything was overwhelming. His mind was lagging behind, trying to make sense of what was happening, while his body was continuously experiencing new things by the second. Nothing made sense to him, all he knew was that he was in Assiah and that he now had a body of his own, but everything else was muddled. What was he here to do? Why did he leave Gehenna, his home for this unknown place? Why does everything feel so weird? Why is everything so different?

Distressed, and overwhelmed by all the sensory things he was feeling for the first time, Rin took several quick breaths, and soon regretted it. The cold air that passed through his nostrils felt like it was carving his throat into ribbons. His first instinct was of course to cough.

Following his body's natural instincts, Rin lurched forward, and quickly placed his hand on the strange surface in order to steady himself and not fall on his face as he coughed, while simultaneously taking breath in between, which only made the coughing worse.

"Is….h….h…..ok" a strange sound came from above him, and Rin quickly stopped coughing, and froze on the spot.

He didn't understand what the sound was, or what it meant, but with his attentions pulled to it, he could sense that there were other beings around him. And since he was still confused, and overwhelmed by everything, he froze on the spot. He had very limited knowledge of Assiah, and its inhabitants, so for all he knew this strange beings surrounding him could mean to hurt him.

A sudden emotion hit Rin, one that he had never felt before- fear. He was scared of the unknown, and the strange things that were surrounding him, and so Rin unconsciously unleashed his flames out of instinct, and as a tactic to protect himself from the strange world he had just been plunged into.

"G…...AWA…" The strange sound came out louder.

Once more Rin couldn't really understand, despite the voices getting louder, and numerous which only managed to unnerve, and scare him more. As retaliation to the sound, Rin spread his flames further, making everything pleasantly hot around him, but burning what was around him. Why was he here? What is going on? Why did no one warn him that this is how it would be to come to Assiah? Why is everything so different?

Rin felt another strange feeling bubbling up inside him, which he could only describe as frustration, and anger, something he had rarely ever experienced. And through his anger, the flames spread and raged on, as they bid his command to protect him by burning everything that crosses their path, and Rin allowed it. He didn't care of what he would hurt, or what he would burn, or who he could kill. All he could think is that it was too damn cold, and everything felt strange!

Rin gritted his teeth, and bared his fangs at the floor no longer able to take the sensory overload he was feeling. He wanted to make everything stop, but no matter how hot his flames got, it did nothing to alleviate him, and yet the flames persisted.

Rin formed his hands into fists, and the flames grew hotter. He honestly didn't know what he was trying to achieve, all he knew was that he that he wanted to stop everything that was going on around him.

Rin unclenched his hands, and felt his flames build up inside his body, ready to be released, and destroy everything around him.

Moment by moment, the flames built up inside him, and the sound around him got louder, and louder, sounding more desperate. Rin took a deep breath, and he almost reeled his head back from the awful stench. The smell of fear, and desperation surrounded everything around him, and he was sure it was not coming from him. He didn't know where it was coming from at first, but after a few moments he realized that the fear must be coming from the being around him. For a moment, Rin felt his flame's intensity lower, but then they came back to full force when he heard a particularly high pitch sound.

Rin furrowed his brows, and bared his fangs, he was ready to unleash his flames and make everything stop, but just when he was about to send out his flames into an explosion, and particular sound stopped him.

"Rin." A smooth, strangely familiar, and warming voice penetrated his ears, and though it wasn't as loud as everything going on around him, Rin could hear it clearly, as if it was the only sound around him.

Rin's eyelids flew open, and as if someone had put a snuffer on his flames. The hot, blue flames quickly dissipated in a huff, leaving everything burnt to a crisp, and creating thick smoke around him.

It took him a few seconds to regain himself, but once he did his eyes slowly lifted up from the ground, and he looked up. As is had been when he had his eyes closed, everything was too bright and his eyes were slow to focus and make sense of what he was seeing, but once his eyes focused he could see the silhouette of a person standing before him.

Rin kept staring at the figure ahead unsure as to what, or who it was, but for some reason he didn't feel afraid, and he didn't feel fear from the being standing over him.

After a little while of just staring, the smoke began to dissipate and soon he was able to see the figure standing in front of him.

A person stood in front of him, who was quite tall, in fact Rin had to raise his head higher in order to look at the person's face. The first thing his eyes landed on was the neatly combed, slicked back blond hair that spiked up at the back. From there, his eyes traced their way down, and he was met with a set of bright green eyes that seemed to pop out, due to the long eyelashes it had around them. Rin's eyes proceeded to moved down to look at the person's attire. The person wore a strange teal, double breasted suit, which had a bunch of shiny objects pinned to his left breast, which Rin had no idea what they were, but knew were important. The attire's strange colours attracted his attention, but what really caught his attention was the long red cape, that was flowing gently behind. Rin's eyes followed the hem of the cape, mesmerized by it, until his eyes came across a delicate, blond tail that swished about from side to side softly.

Rin's eyes drew back and he looked at the person's complete body. The first impression he got, was that the person easily bore an image of power, and importance and that he had an air of command, and strong imposition about him. But despite the commanding image brought forth by his attire, and body, Rin could sense something else.

Rin could smell sickness oozing from the body of the person, a sickness so great that it made him cringe, and gave him the strange need to move away, which he controlled. Rin could sense there was more to the person than sickness, and indeed there was, and it was incredibly clear to see. Underneath all that sickness was power, a power so great that it would make the fiercest and most powerful demons cower away in fear. A power which could command legions of demons in Gehenna. A power Rin knew all too well.

Of course Rin knew right away that this had to be Lucifer, his oldest brother, and the most powerful of all the eight demon kings.

At his realization, Rin's eyes instantly snapped up, and met his brother's sharp green eyes, with his own blue ones. When his eyes settled on Lucifer's, his first reaction was to look somewhere else, and scurry away from the second most powerful demon in Gehenna -apart from their father of course- but he managed to stop himself. He knew his brother -while he was powerful, and rightfully frightening due to his immense powers to any demon- he knew Lucifer wouldn't hurt him, they were brother after all and Rin had never in his life seen his eldest brother hurt any of their sibling before, even those that fell out of line. But above all else, Rin knew he wouldn't hurt him because they were on the same side, and because he didn't sense any intent to hurt him. Still, that didn't prevent him from wrapping his tail around his body in a submissive, and almost fearful manner.

Rin's eyes stayed glued to Lucifer's for quite a while, neither of them looking away, even after what felt like a minute went by.

Lucifer's eyes were piercing, and just as imposing and intense as power was, which made it hard for Rin to keep eye contact any longer. Unable to take the piercing eyes any longer, Rin was the first to crack, and he moved his gaze to another part of the room.

Rin's eyes kept staring at a boring wall behind Lucifer, until he felt the need to communicate with his brother. Rin opened his mouth instinctively knowing that was how he could communicate, but no sound came out. It was in that awkward moment that Rin realized that he didn't know how to communicate in this form, and world, so what came out of his mouth were incomprehensible gargle.

Rin quickly closed his mouth shut, and he felt a strange burning feeling on his cheeks that he was sure weren't caused by the flames. Ashamed and embarrassed that he couldn't communicate, he looked away from the wall, and looked at the ground instead, feeling a bit useless.

If he couldn't communicate, or overall function in this world, then what good was he? He thought that the transition to Assiah would be easier for him than any other demon, because he was originally from Assiah, but he had clearly been mistaken. Having spent fourteen years in Gehenna, and coming to Assiah he felt like he had been reborn, and what good was that to anybody? He felt like he was a child who had to learn everything again, and that made him feel hopeless.

Rin gritted his teeth, and formed his hands into fists once more, but before he could get frustrated again, he heard a voice in his head, a voice he knew well. "Do not despair, I will help you."

Rin's head jerked up, and he looked at Lucifer once more. His brother's words didn't really bring him comfort, but there was something in those eyes, something that screamed determination… something that told him, things were about to change.

Author's notes: There's a lot of things happening in this chapter, and not a hell lot of context, so if you're a little bit confused don't worry, things will start to make sense soon!

Now as for Rin, there's a lot of emotions coming from Rin here, and his emotions are all over the place, but honestly if you were taken from an immaterial world into a material world, wouldn't you feel overwhelmed? So yes, Rin has a long way to go in regards to learning the ropes, but that doesn't mean it will last for long, he'll be up and ready to get the story started in no time.

Now as for dialogue, there will be a lot more dialogue on the next chapters, i just wanted to limit dialogue on this chapter, and simply show the story visually for now.

So hope you liked this chapter, please review and see you next chapter :)