Hmmm. Should I bore you with hilarious antics about both of their upbringings, or should I do some quick-shots so you get the gist?

Perhaps in this story, I'll do quick flashes, and in a seperate, I'll go into full detail?

For now, Rin and Yukio start training.

XxXxX

Satan looked at Rin in shock.

Was he faking the whole time?

Of course he was.

Daee indeed.

Rin ran around his large room in childish glee.

"This is sooo coool!" He yelled, running in circles before summersaulting over his large bed. He tumbled straight off of it, though, and continued rolling with his momentum.

The room was easily twice the size of the Sanctuary, with a huuuge California King-sized bed smack dab in the center.

He could learn to live with the red color of everything, if this was where he'd spend most of his days.

It was so cool!

Satan smiled, watching his son.

His son.

Satan weighed his options - he needed to tell his son what he was training him for, sooner or later.

Tell him now, and make him lose that happy look on his face, or tell him later, and make him mad at me for not telling him sooner? Satan wondered, watching as the child did a hand-stand on his bed. He immediately toppled over, though, as the bed was too soft.

Satan sighed and decided to get this over with.

"Hey, kiddo, come over here and sit down, okay?" He said, sitting in the chair to the small desk in the child's room.

Rin looked over breifly and smiled before grabbing several pillows off of his bed. He arranged them in a small throne for himself infront of Satan's chair. "Story tiiiime!" He said, smiling.

Satan sighed. "Here goes nothing."

XxXxX

Long ago, back when the world was new, there was a man. This man was floating in a realm that was not Assia, and not Gehenna, but rather, a place in between.

He floated like this for who knows how long, until he got bored. He desired land - and land he recieved. He noticed a small planet off on the distance, so he 'swam' over to it. Once he was on the planet, he found that he could not leave it.

The small planet was covered in dark 'sand', as he called it, and he soon grew bored of the landscape. He decided that he wanted to make 'trees' and 'flowers', whatever those were.

As he wished it, he found that it was created, if a little small.

XxXxX

Rin interrupted his story. "Who was this man?" He asked, genuinely curious.

"This man called himself God." Satan told the boy, before launching back into his story.

XxXxX

He created a small haven for his creations on the very top of his little planet, and he surrounded it with 'walls.' He created all sorts of 'animals' for this land that he called Eden, but he found it lacking. Eventually, he decided to create creatures like him - things he called 'Humans'. However, the first creation was odd, and deformed. It had two sharp fangs, and too-pointy ears. He had claws, instead of hands, and a tail. Disgusted with the creation, God shipped it off into the Sand, thinking that it would die without food.

However, he was wrong. The creature that called itsself a 'Demon' found that it, too, could create. So, he launched himself off of the planet, named Assia, and he created his own land to play with.

XxXxX

Rin smiled and clapped here, saying, "That's Gehenna!"

Satan smiled. "That's right. The demon had created Gehenna."

XxXxX

Eventually, the Demon wanted more than this - so, as God was creating Humans, the Demon decided he wanted to make more of his own kind.

He made many different forms, humanoid, animal-like and all, but he cast none of them out of his land. His land was expanded, much like the Humans expanded.

Eventually, though, his creations got hungry, and no one but he could create. No one but he had the blue flames.

They needed to eat something, and the only things that could grow were in Assia. So, he made the first portal.

His demons went, and they fed. This was known to the humans as the fall of the Assyrian empire.

While the First was down in Assia, he fell in love with a human, and he impregnated her during his breif trip.

Unfortunately, he had to return, and he left her behind.

The world he returned to had started to crumble. Hoping to save it, he asked Gehenna itsself what to do, and she said, 'You alone can not control me. You need to assign helpers - eight others. One of Earth, one of Rot. One of Time, and one of Fire. One of Insects, one of Water, and one of Spirits. Finally, you need one of Light.'

Frantic, the First assigned who he hoped would fufil the spots to their posts. Many of them died immediately, however, as Gehenna rejected them. They were not good enough.

XxXxX

"That's horrible!" Rin said, interrupting. "How could she do such a thing?"

"She had to do what was right, Rin." Satan said.

XxXxX

Eventually, he managed to get people that she accepted into place.

However, his son had turned two by this point. He knew he needed to raise this child as his heir, in case something happened to him.

As such, he sent down the King of Earth to get his son.

His son's name was Satan.

XxXxX

"It's you!" Rin yelled, smiling.

"It's me." Satan said, smiling sadly.

XxXxX

He raised Satan to be his heir, and to be a good one at that. His son was stronger than he, but even his son could not create as he could.

On Satan's eighteenth human birthday, The First grew sick and died.

In anger, Satan reigned hell upon Assia at his first chance - known to the Humans as the Crusades.

Exorcists were created.

XxXxX

"Do you regret it?" Rin asked.

Satan thought back all of those years ago, to when he had first attacked humans. Sure, he had felt bad about it... but regret was a stretch.

XxXxX

Years passed, and Satan made sure that three Assia gates were open at all times. No demon could open them, except him.

The Kings of Light and Earth had both died, their heirs dying with their mother. No mother to a demon child survives childbirth. Satan's children with a higher-mid-level demon had taken those thrones - Lucifer for Light, and Amaimon for Earth.

Eventually, he went down to Assia to see how things had changed. There, he attempted to find a suitable body to walk around and see the world in. He had never forgiven Assia for causing his father's death - he had blamed all humans for one's act.

While there, he came across one who was immune to the Blue flames - a girl named Yuri.

XxXxX

"Is Yuri mommy?" Rin asked, his eyes lit in excitement.

"Yes, she is. She was truly beautiful, too." He said, smiling sadly.

"Wait a minute," Rin said, his tiny brain thinking hard. "You said Demons that fell in love with humans died. Did you not love my mommy?"

Satan shook his head. "I loved her more than anything, Rin."

Rin thought some more, before looking up again, teary-eyed. "Does that mean you'll die when I turn eighteen?" He asked, dreading the answer.

Satan nodded, grim.

Rin jumped from his throne to hug his father. "I'll become the very best, like no one ever was." He promised.

They sat like that for who knows how long, before Satan spoke up again. "It was a dream of ours, that there would be a world where Humans and Demons could live in harmony." He admitted, petting Rin's hair.

Rin pulled back. "Then next time you and I can both go through a portal, I'll make that dream come true! I'll join the Exorcists and show them that not all demons are bad!" He vowed this to both God and to the First, and he knew it would come true.

"That's not until your fifteenth birthday nears, Rin!"

"That's okay! I'll wait!" He said, with as much determination as a four-year-old could have.

Satan smiled. "I don't doubt that you will, Rin. Now, I think that's enough for tonight." Satan stood up, shaking out his leg; it had fallen asleep. "Good night, Rin." he said, as he left the boy's room.

XxXxX

Yukio and Rin both swore then; they would train hard, and they would be victorious.

XxXxX

Hades that was long! I had created the Demon story the day previous.