A/N: Hi guys! I hope you guys enjoy! This is my first Fanfic! Please feel free to review and if anyone is interested in beta reading for me please DM me!

"HAAAAAA?! How come I have to be a student again?! I finished school in Gehenna!" The raven exclaimed. The shock was clearly displayed on his face. His brilliant blue eyes widened and his jaw was hanging low showing his fangs. As he crossed his well-toned arms the silky blue fabric swayed with his movements and he let a pout ornate his face. "Consider it undercover work, you take a class under the Paladin and give me information of the other students," Mephisto waved his arms around nonchalantly, "Their potential and even get to be all brotherly with your twin." He smiled sarcastically, then pointed out, "And! Since you did finish school in Gehenna, it should be a piece of cake, why are you worrying?" Mephisto smiled at his youngest brother. "That is not the point, and I haven't met my 'brother' and I don't care for him. He is a human." The younger demon sneered.

His older brother smiled as he handed him the paper, "You have no choice, Otouto, it's an order. You wouldn't want to disobey me, would you?" Mephisto's eyes narrowed slightly, smile widened, and his head rested on his hand. His face may seem nice, but his eyes promised punishment.

Rin gulped and shook his head. The last thing he wanted to do was enrage his older brother, knowing that he would deliver a punishment far worse than anything in Assiah could possibly ever mimic. Mephisto wasn't a demon king for no reason. If Mephisto wanted he could make the Baal loathe the day they were conceived.

Mephisto smiled and handed him a backpack filled with uniforms, books, other stationery, and a schedule of all his classes. "Don't worry little brother you can stay in the manor with me. It would be unjust for a demon prince to be in a dorm with other humans." Rin pouted at him and nodded, the last thing in the world he'd want is to stay in a dorm with another useless human. He wasn't too happy about this mission but if his older brother really commanded it, he couldn't go against it. Samuel was a demon king after all. Second in command, the last thing he wanted to do was pick a fight with him. That would end horribly for him. While he was sure he could keep and has kept his ground, his brother was not a foe you wanted against you. His brother could be absolutely terrifying and besides the point, he'd never fight to kill Samuel. He cared too much for him as a brother that he simply wouldn't. He also would never admit to a crush on his older brother throughout his childhood. As weird as that was, his brother wasn't the most attractive, he had an odd taste in clothing, weird obsessions, and over 70% of what came out of mouth was an elaborate lie. He simply couldn't help the feeling of submission when it came to his older brother Samuel and Amaimon begrudgingly as well. The way their voices would lower when they dominate another and suddenly become so menacing. It is seductive and often times has led him to get a bit excited, and once again, he would rather die than admit this to his older brothers. He simply would rather not. He didn't think his older brothers would see him in that manner and he simply didn't want to put himself through that embarrassment. After all, who would think that a Son of Satan would be of all things, gay?

He noticed from the beginning that he never liked girls no matter how beautiful and 'desirable' they were. He simply didn't like women and once again, he would rather kill himself than tell anyone.

His older brother turned his chair around to face the large open window and signaled with his hand dismissal. Samuel looked visibly amused with his choice of actions, which by every means annoyed his little brother. Without a doubt, Rin would need all the luck he can get to not murder everyone in the classroom, but he wasn't a demon prince in just name. Rin in social settings was poised, dignified, and graceful. He was a beautiful demon and just like all demons that were directly related to Satan, had high expectations.

Rin exited Mephisto's office swaying his hips lightly with his walk and allowed his elegant robes to flow with the wind. He no doubt looked like royalty. Especially with his golden jeweled crown and expensive attire. It was safe to say that he hasn't changed his style since Gehenna and he was most likely going to have a lot adjusting to do when he went to cram school. Even if his uniform was higher quality than most other students it still didn't compare to the luxury he grew up in.

Rin sighed rather loudly as he made his way to his flamboyantly expensive room. The room by itself could have been a house in itself. It has a large luxury bathroom, with a modern shower and a gold lined tub. The rarest of grey gems were used as tile for the bathroom. Then next to the restroom was a walking closet the size of a store, filled with designer clothing, hair tools, a large collection of shoes, and nice belts.

The bedroom held a king-sized bed with a large duvet and a startling amount of pillows. The entire room had a neutral theme, black, grey, white, blue, and gold. There were no other colors. It all appeared so well put together you would think that it was never used and sole purpose was to impress visitors. The way that the room appeared as if no one even lived there. Not even a single item was out of alignment. Everything even seems measured and perfectly calculated to perfection.

Rin went to his office, filled with books and computers. He sat down in his genuine leather chair and started to read some books that he recently bought to pass time till he had to go to school. Demons did not sleep very often after all; while they could sleep, it was not necessary for them. It was more of something to do when there is nothing to do or they were injured.

"A human brother…. How can I even deal with someone like him?" Rin frowned pulling out a file, "Okumura Yukio," He muttered to himself. Why did he even have to do this mission? Even with the same last name as him! The nerve of Samuel!

"Okumura Rin. How distasteful." He couldn't believe that such an idiotic scheme was even going through his head. Mephisto obviously has an ulterior motive behind this, what it was, he would never find out until he was probably dead somewhere in a ditch.

Several hours later:

"Hello, My name is Okumura Rin. It is a pleasure to be in this class." The rigid boy announced to a large classroom. There were many odd people here, but not as odd as the teacher and his supposed brother who is staring a hole into his face. Everyone else stared at them repeatedly, trying to find the similarities.

"Okumura Yukio." The demon mumbled attempting to keep the scowl off his face. His younger brother looks like an idiot but for a human, he guessed he would be smart.

The Paladin got his attention, "Please tell the class about yourself, just a few things, like your hobbies, likes, dislikes, and maybe a couple fun facts." The young demon knew what he wanted, that was to gauge him.

"Hmm, my likes? My likes would have to be cooking, kendo, reading," Rin listed with his fingers, "And learning new things. My dislikes would be incompetent people, ignorance, and disobedience. A fun fact about me is that I was raised here at True Cross Academy with my older brother Mephisto." Despite his smile, it never did reach his endless eyes. Eyes that held years ahead of what he appeared.

The Paladin didn't seem like to like Rin's introduction too much. From what it seemed he was wary of Rin. Clearly worried for his adoptive son, something not so good, "Please stay after class so I can get you caught up with the rest of your peers," The Paladin paused debating whether or not he should say it, "Have you received you tempiant? The rest of the class received it last week. You came a bit late." That confirmed Rin's suspicion, none of the class knew what he was, most likely, only the Paladin.

The man remained silent for a moment thinking about his response, "I can see them." The Paladin nodded his head with his thought clearly etched into his face. It seemed as if he was contemplating an advanced calculus problem, the way his grey brows furrowed and the wrinkles creased dramatically, displaying his age.

"Where will I be seated?" Rin said with a brief pause of silence, some irritation did make its way into his words, only a trained professional of years could have heard it. It is because of that Shiro is not alright with Rin, because unlike Mephisto who he was sure that he could rely on, Rin was a dangerous variable. Just like he had speculated, he was being raised by Mephisto. He had no reason to doubt Rin's words, but that did not mean he wasn't going to question Mephisto about this. He was simply worried for his son, he didn't want his son to get attached to a demon with bad intentions.

"You will sit up in the in the middle, the seat behind Yukio-kun," Fujimoto paused to catch his son's attention, "Yukio-kun, please raise your hand." Yukio raised his hand with dramatic speed, eager to meet his brother which he had been working exhaustingly hard to meet and impress. He always wanted a brother and when he found out that he had a twin, he felt as if he had an opportunity to meet his other half and finally complete the empty feeling in his soul. Nothing was going to stop him from seizing this opportunity.

Rin walked up to the seat behind his human brother and pulled out his supplies for school. A bunch of expensive looking stuff, all of it followed his neutral themes. Even his highlighters, which is really hard to find in neutral colors. His notebooks, black and hardbound genuine leather. He knew he looked like a rich snob but he couldn't help it. He was a demon Prince, the last thing he would settle for was 99 cent store quality. He was royalty, and that was something he could not mask. Thankfully his older brother did not request that he change that for this "mission".

He took his seat and sat upright and indifferent for his lecture; waiting for his human brother to finally start talking.

After a few more moments of silence, it wasn't his brother who spoke but the kid next to him with an interesting choice of hair color.

"My name is Suguro Ryuuji, nice to meet you!" He says with all the smugness in this planet, it almost, almost, almost, comparable to Azazel's attitude. He even uses his thumb to point at himself. Rin takes his time to acknowledge him, "Cool." Rin dismisses him, it was evident that Rin had managed to get under his skin already. A skill that Rin was simply blessed with, "I don't fucking like you and your cool guy attitude." Rin yawns dramatically, not even bothering to care about his classmate's words.

With a loud growl and a fist to the desk he gets in Rin's face, now that they have the entire class's attention, Rin looks at the young delinquent, "Class is commencing."

Ryuuji snorts, "No shit." The Paladin finally got involved, "Suguro-kun please take a seat and relax." He chastises the rowdy teen. A couple grumbles and deep breaths later Ryuuji finally settles down in his seat, still with a contorted facial expression.

Despite 2 minutes passing Yukio still couldn't find the words to say to his brother, but it seems like Rin had enough of this silence, "Okumura-san, do you think we could speak after class?" Rin spoke politely with a smile, "Y-Yes! I would really like that." Yukio stumbled on his words, not expecting Rin to be the first to speak, which also raised a question, how did he know his last name since he didn't introduce himself, but he brushed it off. Everyone knew who he was. It wasn't too hard to see how Rin would know his name, especially considering that he was raised by the Principal of True Cross. It makes sense as to why he looked… so expensive. It almost made him feel out of place, like a commoner in a rich palace. He wondered why Rin came so late to the class. Well, it wasn't that late but it was a week or two since the start of the class. He simply hoped he could get along with him. There was so much he wanted to know and get to know.

Rin, on the other hand, was wishing that Gehenna would swallow him whole, he was so irritated and bored. Humans are idiots. He couldn't even stand them, it was seriously bothering him to be in the class. The Paladin was surprisingly dumb, even if he knew that a man like him was capable of doing damage. The class rolled on rather quickly, it went pretty much according to plan. Rin knew that he would have to deal with them in a nice manner. He had to get them to like him. It basically is what would make Mephisto content with him, even if mad Samuel was in his fantasies, that did not mean he wanted to be at the receiving end of his punishments. Besides, there are always rewards when he did good things for his older brother.

Unfortunately for Rin, time went by way too fast. The class had ended and he knew it was time to be the best actor he could possibly be. His brother has expectations of a successful mission and he was sure that he could deliver one. Rin collected his items and put it in his backpack and walked over to the front once everyone had left to the next class.

"Rin I have a couple questions for you," Fujimoto nodded as he said this, "Are you Yukio-kun's brother?" Well, he didn't expect him to be so direct with that, as it seems neither did Yukio.

"That is what Mephisto-Nii said." His response was curt but soft making sure not to seem so intimidating. He wondered why he even had to do this. It was clear that Mephisto had more than enough information on Yukio and the Paladin. Maybe he wanted to kill off one of them?

"Why couldn't we meet you sooner? How long have you known?" Yukio rambled letting his emotions take hold of him, Rin bit his tongue a bit before answering, "Mephisto let me know recently that I was related to you so I requested to be in a class with you. I found it kinda odd that we looked alike." Rin finished with a smile, how gullible humans were was just hysterical. Yukio had too many emotions it bothered him, "Yeah, I thought you would have the same last name as Mephisto," Fujimoto said with suspicion prominent, "I do, however for some reason unknown to me, he changed it on my school forms, I assume to let you guys know who I was," Rin forced his smile this time, hoping that The Paladin would stop being so nosey, but his response didn't seem to appease him. The Paladin didn't continue prying but it was clear as day that he didn't trust Rin in the slightest bit.

Fujimoto had millions of thoughts and concerns when it came to Rin, and he was for sure as Gehenna not going to allow a demon he didn't trust fully hanging around Yukio. Even if Yukio was technically also a son of Satan. The difference is Yukio was raised at a church and only Gehenna knows where Rin was raised if he was raised with Mephisto.

Fujimoto sometimes even wondered if he should trust Mephisto, now this unknown variable is not going to be good. All he knew now that he has to question Rin privately, not in front of Yukio.

Only now would be the best time.

"Yukio-kun, I would like to talk to Rin for a bit in private please."