Yay, new story. I honestly, really, didn't know how to end this, so if it sucks I'm sorry.
I actually did a bit of research for this one. Dantalion is one of the Dukes of hell, according to satanism and the like. For more info...google it.
I don't name my chapters because it was hard enough to name the story. Also, I own nothing related to Ao No Exorcist/Blue Exorcist.

The apartment was nice and clean, quiet. And that's how she liked it, peaceful. Indeed all was peaceful until her door knob turned and those two walked in. her daily life was hard enough without random exorcists popping in to ask for help, advice, or to report in. but these two, they were the bane of her peaceful moments that were few and far between.

"Shiro, Mephisto, what ever could you want with me? You're of a higher rank then I am Shiro what help do you need from me?"
"Calm down, Dalian, we're not here to fight."
"You this is my house so I suggest you not speak out against me." That seemed to shut him up pretty fast, one less bother to deal with.
"So what is it you need Shiro?"
"My sons, I want you to watch over them."
"Aren't you a bit too old to be having kids old man."
"Oh I'm sure you're much older than I am, Duchess Dantalion."
"Hrmph, fine, I'll keep my eyes on then. Is there anything in particular I'm looking out for?"
"If something were to happen me I just need you to make sure nothing bad happens to them."
"Oh, there's two? What are their names?"
"Rin, the older one and Yukio the younger one. They're Yuri Egin's kids."
"The woman you used to look after? She gave birth to Satan's sons?"
"Yes, she willingly took them; those two need a steady guiding hand if something were to happen to me."
"Alright, I get it. I'll be your eyes and ears from the grave if necessary."
"Thank you, oh and by the way, Shura is Rin's mentor and Yukio's comrade."
"What? How could you, I'll never get another peaceful day in my life if you die. So, you had better not die Shiro."

Shiro pulled a key out of his pocket and the two left. If something really was to happen to Shiro she would have to keep her eyes on those two kids. But, the question was how to go about doing that. It's not like she could send one of her demons to watch them, someone would notice. The easiest way would to be near them at all times, but how do I do that? She spent about 5 minutes thinking about it before she went back to relaxing. Like anything would ever happen to that old man, he isn't paladin for nothing. When the time comes I'll figure it out then. Little did she know that barely a month after that visit the time would come.

"Lady Dalian, I've just been informed that the paladin, Shiro Fujimoto, has been possessed by Satan and killed."
"What?"
"Uhh….when Satan possessed him he took his own life to save his son's. He died a hero's death."
She was seething with rage; a trip to hell would have to be made soon. "I understand, you can go now."
"Yes Lady Dalian."

So the time had come eh? Well now she knew the perfect way to keep an eye on them. It would just take a few little lies and pulling some strings here and there. And she'd have to contact Shura to solidify the plan. She pulled out her phone and dialed the first number.

"Hello, Shura, it's me. Yeah I heard. Shiro told me that you were to be Rin's mentor; we need to have a chat. Huh, sure, that's fine. Don't be late, and don't show up drunk. Yeah, bye."

Call one down, one more to go.

"Hello? Mephisto, are you there?"
"Ooooh, Dalian, I never thought you'd call me. What is it that you need?
"I need a favor from you."
"Is it concerning the visit from a month ago?"
"Yes."
"Well, what can I do for you?"
"I need you to put me in as a student in the exorcist cram school. That's how I'll be keeping an eye on them."
"That's a smart move. If you were to send one of your lesser demons it would be found and destroyed, then traced back to you. Alright, I'll make the changes and inform the other teachers."
"Thanks."

She hung up quickly not wanting to talk to him more than necessary. Right after she had hung up the door opened and Shura walked in.

"So what is it Dalian?"
"It's about Shiro wanting us to take care of Rin and Yukio."
"What about it?"
"I know you have your work as an inspector to do, but don't forget a dying man's last wish, it's disrespectful."
"Well, you've gotten used to Japan's customs haven't you?"
"Shura, don't be difficult. Just because we happen to be good friends since you were little doesn't mean you can criticize me."
"Whatever, so how are you getting in to watch them?"
"I'm transferring in, just like you, only not really disguised."
"I'll be looking for you then."
"Heh, see you then."

All preparations were made; now the only thing left to do was wait till school started. That meant a nice relaxing mini-vacation for her.

It was the start of a new school year, she hadn't been to any kind of school since….well, it'd been a while. Being the new transfer student was always hard and stressful. Luckily due to her transferring in the very beginning of the school year she had a room to herself. The name on her name plate read Konoe Seiya, an alias she had chosen. Her new alias also came with new looks. Instead of her white hair and pigment-less eyes she had black hair and golden eyes. It took a while to move all of her things from the Vatican to True Cross so she had to rush to make it to the first-year's assembly.

Well lo and behold the younger brother's the first-year representative; he seemed like the straight-laced kind of kid. His uniform was all buttoned up properly, not a hair out of place, this one would be easy to watch. She couldn't see the older one from where she was but she knew better than to expect the same.

After the normal students assembly she headed off to the exorcist cram school area. It seemed the number of keys on her key ring was only getting bigger, and she had a key to almost everywhere. The hall way in the exorcist cram school was empty, not a soul to be found. But, there were people just down the hall so she made her way to the room to find a few students waiting there. There was a girl with old style eyebrows, a normal looking girl, a boy who was bald with glasses, another guy with pink hair, a guy with piercings and a blonde streak in his hair, some kid with his puppet, and finally a guy with his hoodie on and hood up. She was sure the hoodie kid was Shura, after all that kid was the only one hiding his face. She went past the other students and sat down in the back. A few moments later Rin walked in with Mephisto, who was disguised as a dog. Barely a second after the teacher came in, and oh, surprise, Yukio Okumura was the teacher. Knowing Mephisto could see her she shot him a dirty look. Yukio introduced himself to the class and then asked about spirit wounds. Not all of them had one, and it was essential for an exorcist to have one. Just then Rin stood up and began asking his brother all sorts of questions. They fought about it for a second before Rin accidently knocked the vial of blood out of Yukio's hand causing it to spill. As soon as the vial hit the floor the demons began emerging, being a good teacher Yukio evacuated the others, but not before she was able to put one of the watcher demons in place.

From the safety of the hall way she watched and listened as the two brothers fought. It was just lucky that neither of them noticed the little demon. It seemed that Yukio was born with a spirit wound inflicted by Rin, and that he had known all along that he was a demon. These two will definitely be interesting to watch.

The next day there was a new student in the class Shimei Moriyama, she was dressed in traditional clothes instead of the uniform. Also, it seemed that Rin was not the type to learn though lecturing. He was constantly falling asleep in the various classes, and his score on tests….there was a lot he had to learn. The kid with the blonde streak in his hair didn't seem too like the Rin, he picked a fight with him over test results. Humans are so stupid, but that's what makes them interesting I suppose. The next class was practical athletics, and athletics was not a strong point for her. And those two, they were at it again, fighting. The one called 'Bon' dared Rin to get close to the leaper. Rin refused, he said he had ambitions that he couldn't die now. Well the other little fool went right down to the leaper and was almost eaten, if not for Rin. She disregarded the speech he was giving Bon, she was more interested in Yukio, who was hiding around the corner. She couldn't see him, but she knew he was there, and she knew he felt the power of Satan being used. Later that night she sensed Amaymon, another of Satan's sons enter the academy grounds. He must be talking to Mephisto. She passed it off as nothing to take note of. But eventually his presence would be something to worry about. But summer was coming and that mean the exwire exam was up and coming. This would not be the nice relaxing summer on the beach she had hoped for.

CONSTRUCTIVE AND NON-CONSTRUCTIVE CRITICISM IS WELCOME, comments in general are nice.
I really hope the next chapter turns out better than this one...
Also, if you know what DRAMAtical Murder is, then you know where the idea for the main character comes from.