I don't own Harry Potter or YuYu Hakusho. Please don't sue! Set during Harry's 6th year, I didn't like the way the book went so…I'll still follow some of the plot though. Have fun reading it!

Chapter1:

Dumbledore was frustrated. Professor Umbridge refused to come back to Hogwarts, ever again, not that anyone had a problem with that, but it meant that once again he did not have a defense against that dark arts teacher. He sighed. No one wanted the job. Cursed, people called it. And Dumbledore was starting to believe it. If he didn't find a teacher himself soon then the ministry would once again appoint one, which Dumbledore sure as hell didn't want. Anymore ministry bungling and, well…he didn't want to think about what the outcomes could be.

Snape was also a problem. Since a ministry official was the last thing he wanted on is hands, if he didn't find a qualified teacher for the dark arts lessons he would be forced to turn to his potions Professor, and then, Dumbledore shuddered at the thought, he would have to find someone for the potions teacher position and this nightmare would start all over again.

A knock on his office door broke into his thoughts.

"Sorry to interrupt you sir," Professor McGonagall apologized brusquely, "but we have another applicant for the defense against the dark arts position, would you like to interview her now?"

"I've nothing else to do, let whomever it is in." Dumbledore stated, rubbing his temples in a vain attempt at making his growing headache go away.

A few moments later Professor Mcgonagall walked back into the room, followed by a nervous looking women wearing a shabby business suit that was too big for her. She stood fidgeting in the doorway while Professor McGonagall sat down next to Dumbledore.

He motioned for the young witch to sit down. She squeaked in surprised terror and twitched in the direction of the chair, missing it by a few inches and planting her butt in the floor. An unrefined "umph!" pushed its way out of her. The headmaster raised his eyebrows questioningly at his deputy headmistress. She shrugged stiffly and looked back at the young woman who was picking herself up off the floor.

"So…um… Ms…. Jinsin, what exactly are your qualifications for this job?" Dumbledore started.

"Er…Qualifications?" she asked

"Yes, qualifications, as in why you can work as our defense teacher, why you think we should hire you." McGonagall snapped at her.

"Oh, well you see, I needed a job really bad, but all the good ones are taken and when I saw this one in the ads I just said to myself 'now this…'"

"Really? How interesting, but we're getting off topic. Do you have any qualifications?" Blank stare. "Have you ever taught anything before?"Shake, "substituted?" Shake, "Babysat?"Nod.

"Oh yeah I'm great with kids. Little kids, the big ones give you mouth."

"Great, well, that's all we need to know. Thank you for your time, don't owl us, we'll owl you." McGonogall rushed with fake cheer as she ushered the poor stupid girl out the door. Before they were gone the deputy headmistress turned around and mouthed 'I'm sorry' toward her old friend. He nodded his head as if saying 'I know I know.'

Dumbledore was going to have to deal with every single applicant.

It was going to be a long summer.

BREAK

Hiei wasn't happy, that much could be told. But then again, neither were Yusuke or Kurama. They were all in Koenma's office in spirit world. The little prince sat shuffling papers at his desk. Yusuke was the first to loose it.

"Why the hell did you call us in, claiming that it was 'important' a national emergency' and you're sitting there, shuffling papers trying to make sure you look busy!" He screamed at Koenma. Silence met this comment. Kurama cringed at the loudness, Hiei's scowl deepened and he fingered his sword, and Koenma stopped his shuffling for a mere second to glare at his top detective.

"What are you talking about? I am taking valuable time away from my busy life to explain this mission to you. So if I were you…"

"Oh please, your valuable time? You're immortal! What about our valuable time? Jeez." Yusuke finished poutily, crossing his arms.

Koenma opened his mouth, but Kurama quickly intervened before things could get out of hand. "What Yusuke is trying to say is that we all would really like to know why you called us in."

"Right, what he said," Yusuke put in.

"Well the reason why is because I have a mission for all of you but…"

"No duh…"

Koenma glared, "as I was saying," here he cleared his throat importantly, "But they're all separate parts of the same mission," here he clicked a little remote and a screen appeared in the middle of the room, a picture of a tall, thin, white man with red slits for eyes appeared on the screen. "This man is Tom Riddle, at least that's what his name was in the beginning…" and so Koenma launched himself into the story of how Voldemort came to power, how he fell from power, and how he rose again; The tall tale of Harry Potter."But that's not the worst of it," he continued, "now he is more powerful than ever. Creatures of the darkness are flocking to him, every day he gathers more followers, more knowledge and more power. He has already tied himself to some powerful demons, we think he also has some artifacts of the spirit realms.

"And what are our assignments?" Kurama asked quietly.

"Right, Yusuke, your assignment is to lay low, shadow Voldemort and his army, find out if they have anything that they shouldn't have, and if either Kurama or Hiei need help, you will give it to them. And Yusuke, this is somewhat of a stealth job, so don't be an idiot.

"Kurama, your job is to infiltrate the enemy lines, as a demon, get as many followers to our cause as you can, without drawing any suspicion towards yourself. And get as close to Voldemort as you can. Any information you get will go straight to me, Hiei and Yusuke.

"Hiei, your job will be an undercover one as well, you will be working as a teacher at Hogwarts school of witchcraft and wizardry. A defense against the dark arts teacher to be specific. You will gather information, try to become a member of the order of the phoenix, watch over Harry Potter and the other students as well." Koenma pulled a file out of his stack of paper and found a couple pictures of the subject matter, handing them out, "And please Hiei, try not to kill any one!"

Silence. Utter silence met his mission briefing.

"You expect me to do what?" Hiei asked in a deadly whisper.

"You expect him to do what?" Yusuke laughed at the same time.

Kurama just sighed and rubbed his temples.

"I expect Hiei to teach at Hogwarts or I expect for him to go to jail. You Hiei are still on probation, remember?" Koenma replied

"Hn."

"I'll take that as a yes."

"But why Hiei, Kurama and him could switch places and it would still work out wouldn't it?" Yusuke asked, still laughing at the thought of Hiei being a teacher.

"No Yusuke, it wouldn't work out. Kuramas not old enough."

"But neither is Hiei!"

"Yusuke, do you now how old Hiei is?"

"Ye…no"

"Then shut up, no one can actually discern his age for certain, and Kurama's age is easily known when in human form. Plus Hiei is better suited for the dark arts."

Hiei glowered. It would be so easy, so wondrously easy to flicker to the other side of the room and lop the toddler's head off. But no, he caught the demi-god's warning glare, he was stuck with this assignment, come hell or high water, or demons wielding the fires of purgatory. He scowled (again) and stalked off.

BREAK

It had been along summer, three interviews in all so far and all of them with the IQ of a field rat.

Not that Dumbledore minded the kindness of the two witches and one wizard who came in. he was desperate and they needed a job. But he needed someone who could actually teach, especially now that Voldemort was back.

Dumbledore sat there, thinking these thoughts and many more when Professor Mcgonagall knocked on the door, coming in without waiting for permission.

"Another applicant sir," she stated in her strict proper manner. Dumbledore sighed and rubbed his head. McGonagall saw the movement and stated, "This one I think is different sir, he has a resume, information on himself and he has recommendations from a few people, and well, take a look for yourself." At this she handed him a stack of papers in a folder. Dumbledore opened it and looked inside. His eyes widened. The information was amazing. He shuffled through the papers. In between two pages was a muggle style picture and description of the applicant. The picture showed a young boy, or was it a man? Who had black hair that seemed to defy gravity with a white star-burst right above a white bandana. Below the bandana were piercing black eyes. He was very short of stature and he seemed to like the color black. Next to his picture was a description of him, height, weight, and age. Amazing, he was 23 years old, but he only looked to be about twelve or thirteen.

As Dumbledore was studying the boy's papers McGonagall had gone down to fetch the said boy for his interview. In came the very man that had been scowling up at him from the photo.

"Ah…hello Mr…. Jaganshi," Dumbledore smiled and motioned for him to sit down. He didn't. "So it looks like you have some pretty good qualifications," Dumbledore started, glancing at the remainder of the information, his eyes alighted on one term in particular.

Demon hunter.

Dumbledore quietly shuffled through the rest if Jaganshi's file, scanning over the information.

"Tell me Mr. Jaganshi, do you have any former teaching experience?" he asked

"No," Hiei answered shortly. His deep voice startled Dumbledore. He hadn't been expecting that.

"Well what made you want to come and teach here?"

"Rumor had it that you were in desperate need of a teacher, I'm in desperate need of a job," a different job than this he thought to himself.

"Oh, and you think you could teach these children defense against the dark arts?"

"Yes."

"Why?"

At this Hiei shrugged, because a toddler of a spirit world ruler had him here? Only what came out of his mouth was better, "Because Voldemort is back and you need someone to teach these kids how to fight and win, you need a teacher who actually knows what he's doing." Silence met this. Hiei brought his hand up to his face, pretending to scratch his nose as he covered a little smirk. He had even surprised himself with that little speech. Though Dumbledore was surprised for a few different reasons. Reason one that was that was the longest amount of time the man had spoken so far, reason two he had said Voldemort without so much as a flinch. The whole scene brought a smile to his face though. This was their guy.

"Just one more question Mr. Jaganshi, who did you learn spirit magic from?" Blank stare, "You are a demon hunter correct?" nod, "then you'd have had to learn spirit magic, from whom did you learn it from?"

"It should say in the papers I gave you," Hiei stated bluntly. This was the tricky part. Anyone who knew of Genkai (which was the one who 'taught' him his skills for this mission) which he was pretty sure Dumbledore did, knew that Genkai would only accept the best of the best.

"Oh," Dumbledore stated lightly, "so you know Genkai, she's an old friend of mine. And I could have sworn that she told me quite a few years back that she would only take one apprentice, are you that one?"

"Yes." As long as Yusuke never finds out about this.

"How wonderful," Dumbledore stood up and so did Professor McGonagall, who had remained silent during the whole exchange. "Well it is a great pleasure to have Genkai's great apprentice working with us as teacher, I hope to see you September first, nice and willing to start your new job as a defense against the dark arts Professor.

The door snapped shut and the room was silent.

"Well, being that he got the job you would think he would be a little more excited than he showed," McGonagall stated matter of factly, "and he said that he was desperate for a job Dumbledore don't you think…Dumbledore?"

The Professor stopped in mid-sentence, for Dumbledore hadn't even been listening, he whispered quietly to himself "the apprentice of Genkai, this year should be interesting…"