Summary: It was all Mephisto's fault they were stuck in this world. Combating demons easy. Teaching children? Not so much, especially if they were the in training wizards. Now if only her brothers would leave her alone and let her teach in peace, she was a thousand years old demon not a damsel in disaster.

Disclaimer: If you recognise it I don't own it.

Rin blamed Mephisto for all this. Rin was stuck here, in this castle like place which practiced magic. Oh, how she longed to be at home and in her soft and comfortable bed but noooo, Mephisto had to take this job and she had to be put up to it.

So here she was, agreeing to teach a bunch of brats about demons. She really did want to go home but a deal was a deal. If only that clown was not her brother.

"Ah, miss Rin. Welcome to Hogwarts. I take it Sir Phelis send you?"

Nah, a troll send her, of course it was Mephisto who had send her. It was not like anyone could force her now that she had learned to control her flames but with her brothers being over protective you never know. They had not even allowed her to date, except Egyn.

"Yes, may I inquire what was it you needed my assistance for?"

She was not native, as she might have been in the past. Apparently, thousands of years did teach you a great deal about something and one of the things she had learned was that Mephisto always had an utter motive behind everything he did.

"Ah, you see we have a nut case of a wizard called Lord Voldamort who had made himself immortal by splitting his soul and according to a prophesy only Harry Potter could kill him?"

She had heard the whole story from an amused Samael who was snickering the whole time. He obviously found it quote funny.

"Yes, my brother did give me the short version"

She did not want to spend more time than she had to here. A spa was waiting for her when she went back, curtsey of Egyn, bless him

"I want you to keep an eye on him, Harry Potter I mean. He'll be starting the school this year"

Now she was reduced to being a babysitter. Not only she had to teach but also keep an eye on a brat.

Not her forte. They should have gotten Yukio to do it. He was expert in these things not her.

"I'm not sure I'll be able to do it"

Being honest was the best deal. Fuck Mephisto, she was not doing it. It was not her ideal plan to spend a year in school filled with children at all.

"But I'm afraid we've already had a deal and a demon never backs away on his words right?"

She might be a half-demon but still a demon and no matter how much she hated it rules were rules. She had to comply.

"Fine. We have a deal. But I'm bringing Yukio along"

She was not gonna hear a word more on this. If she had to suffer she would make her twin suffer too. Her twin who would actually manage to pass as a teacher looking 22, while she looked 16.

Damn her youthful face.

This is a trail chapter. If this gets response I'll update otherwise I'll not.