Ok so this is my first Blue Exorcist story. I hope people like this.

Rin and Yukio aren't blood related in this but they'll soon call each other brothers.

Onto the first chapter!

A few years ago two boys were born on at the same time; December 27th at 4:02 am.

The first boy was human. His name was Yukio. He looked much like his mother, Yuri, with chocolate-brown hair and turquoise eyes. His father, Hiro, also had chocolate-brown hair that tied in a ponytail reaching the middle of his neck but had dark brown eyes. Both Yuri and Hiro were exorcist, meaning they protected people from demons that try to possess people.

Then somewhere hidden in a wooded area, a half-human, half-demon was born. His name was Rin. His hair was navy blue and he had shockingly blue eyes. His ears where like that of an elf and there were two stubs on his back near his shoulder blades. He had a thin navy blue tail that if stroked, you could feel fur, it also had a tuff of fur at the end. Blue fire surrounded the youth but did not harm it. His mother, Akimi, held him close, the flames never burning her. She had golden hair that was shoulder length and bangs that were to the left. She had blue eyes that shined like the morning sky. Akimi was an exorcist, but she would be punished for this, barring the child of a demon. And not just any demon, no anyone could tell that by the blue flames this child was the son of Satan.

Akimi was waiting for the Gehenna Gate to open so she and her child could leave Assiah, Earth.

Suddenly a voice called out to her. "Akimi! What are you doing?"

She held the child closer to her and turn towards the voice. Shiro Fujimoto. Akimi thought he would be there to congratulate Yuri on her child. Yes she knew about her child, they were friends after all. But then again he's probably her to do something with Rin. He is the spawn of Satan after all.

She glared, "Why are you here Shiro?"

"Akimi you can't keep that child! You know what the Grigori will order if they find him! If they find you!" Shiro said.

"You and I both know they already know. In fact that's why you're here isn't it?" Akimi said bitterly.

"Akimi..." Shiro began, but was interrupted by Akimi.

"Do not worry. I am heading to Gehenna with Rin to raise him. I know he wouldn't be treated kindly if he were to stay in Assiah, and I do not wish for my darling to destroy anyone to get to his son."

"Akimi how are you going to survive in Gehenna!? I'm surprised you survived that monster's birth!"

"He is not a monster! He is a child!" Just then a demon walked in on them. Shiro got out his gun but as he was about to shoot the demon Akimi spoke, 'Is it here?" The demon nodded. "Good. Shiro don't stop me. If you do not wish to kill this child, and I know you don't, then let me go."

Shiro stood there for a moment then lowered his gun. He watched Akimi was picked up by the demon and Rin's face showing as she was picked up. The child smiled at him as he and his mother were carried away.

When the Grigori asked what happened, Shiro said they were already gone. He then visited Yuri and Hiro and couldn't help but adore Yukio. Yuri and Hiro asked him to watch over Yukio should something happened to them. Shiro agreed.

About 7 years later, the family was attacked by a demon, the parents disappearing, and Yukio received a mashou. Shiro took the boy in and taught him about exorcists, the boy being only seven.

Meanwhile in Gehenna a 7-year-old half-demon ran around with one of his older brothers, the king of earth, Amaimon. His father watched with a small smile. The boy looked so much like him! The king of Gehenna had fiery blue eyes, dark navy blue hair that reached mid-neck, the bangs grown out, and two black horns atop his head. He wore a pitch-black suit with a crimson under shirt. His enormous wings were folded to his back, they're black color making it look like a large shadow behind him. His tail, which had a sharp point at the end instead of a tuff of fur, lay neatly across his lap. Yes he does not sound like the Satan you'd suspect but he's only different in Gehenna because then people will fear him.

You'd think that he'd have his tail hidden since it is one of the weakest points of a demon. But you see that is not the case for him. His tail is just another one of his weapons, because he doesn't have any weaknesses. Well he does have one. His youngest son, Rin.

At first he thought the child was going to be a pain, but then Akimi showed him the join in having the boy. All eight of the older sons enjoyed the boy as well. Said boy had grown quite a lot.

His navy blue hair was messy and grew in front of his intense blue eyes. He didn't have horns but when he activated his flames they formed some on his head. He wore a gray-blue t-shirt with black shorts. His tail, unlike his father's, was very sensitive and a hard tug on it made him cry out in pain. Rin only trusted his family with grooming his tail. His wings have grown, not enough to surround his entire body for protection, but it could surround his mid-section. You see full grown wings could surround the demons body and act as a shield since a wing was as hard as iron.

Satan actually began to teach his son how to use a sword. The boy didn't necessarily need to learn how but he needed something other than his flames to defend himself. Yes he had his claws and sometimes his tail could lash out. There was also his strength, but the sword would just be extra protection. But he didn't let him fight with or carry a real sword yet. No…only in practice. He also taught him how to control his flames. Rin wasn't a master yet as his emotions could still cause outbursts but otherwise the boy had control.

Akimi had taught Rin how to cook when he was 5. It didn't take long but soon the boy was a master at cooking. He actually helps out the chiefs even when his father tells him not to. And yes demons eat human foods, not humans. Gehenna is like the mirror image to Assiah. They had some of the same things in common, but demons were just...darker. Demons liked chaos and they had discipline, every demon had its place. If one mistakes its place, it's burned.

Akimi wasn't always with that idea but that's how things worked. Besides it brought joy to demons of all kinds to see chaos and torture.

As Satan thought of Akimi a sad smile came across his. She had died at the end of last year. It was very sad, but he was happy she had made it six years in Gehenna. During that time they had made sure Rin never left. One time, one of his older sons, the king of time, Samuel-or Mephisto as he is called now- had taken Rin to Assiah. They were fine until they ran into some exorcists. Mephisto told Rin to run and ended up losing the boy. Amaimon found him and brought him home.

Since that day Satan made sure to watch his boy. He did not want those filthy exorcist taking his child and doing who knows what. He knew they were most likely watching for the boy but he would not let them take him. That was a promise he made Akimi.

Who knew that promise would be broken so soon?

So that was the first chapter. Um that was what I imagine for Satan. I put Yuri with Yukio because I think he looked more like her. I gave Rin wings in this because I can just imagine him developing wings if he gave into being Satan's son.

Um if you have any questions please feel free to ask. Also feel free to review, comment, flame, etc.

Until the next chapter! :D