Disclaimer: Anything related to the Harry Potter series is the legal property of J.K.Rowling and anything belonging to the Naruto series is legal property of Kishimoto Masashi, Shueisha, TV Tokyo, GAINAX etc…The plot is all mine since I have never before encountered a Harry Potter/Naruto crossover and am not sure if another actually exists.

Summary: When Harry's heritage becomes unsealed, who will teach the boy to master the "Power the Dark Lord knows not"? Set during Harry's sixth year and eight years following the Naruto series (Making Naruto and Sasuke 20).

Authors Note: The story is rated R as it contains extremely graphic violence (with Naruto and HP combined what did you expect?), as well as a lot of profanities and implied (and possibly more) Slash. If you don't like these, don't read. You have been warned. Also, just to note, this was written after Order of the Phoenix, and follows everything through the first five books. Due to the fact that the Naruto series is not complete, I have invented my own ending.

Pairings: Undecided. As far as I know now there is only going to be heavily implied slash. This does not mean there will be all slash pairings (Ron/Hermione will probably feature but it isn't definite).

Now, without further ado, you can read the Fic.

Note: The Naruto series is near complete AU in this fic. Here they were never Ninja, they were raised as Wizards. Also, there is no such thing as the Byakugan or any other Advanced Bloodline. The only Advanced Bloodline is that of the Uchiha, and this will be explained later.

Chapter 3: The Prodigy

The room Harry had walked into was unlike anything he had seen in any of Hogwarts' rooms. The room had varied with his time at Hogwarts; each teacher decorating it in their own way. Harry had seen the room under four separate circumstances.

In Harry's second year, during the time of Professor Lockhart, the room had been a shrine to the former Defence Against the Dark Arts teacher. The walls had been covered in pictures of Professor Lockhart himself, and Harry had hated every moment he had spent there.

The next year, when Professor Lupin had come to teach at Hogwarts, the room had held some very fascinating objects. It was commonplace to encounter some dark creature in Professor Lupin's office, and Harry had found his visits there most interesting.

In his fourth year Professor Moody, or more correctly a Death Eater impersonating the real "Mad-Eye" Moody, had ironically filled the room with Dark Detectors. The instruments had been varied, and Harry had recognised several of them. At that time the room had been a quiet place, and Harry had enjoyed several conversations with "Professor Moody" there. He shuddered when he thought about it now.

Finally, last year the room had been the office of Professor Umbridge. The woman had been enough to make Harry heave, and her room was no better in its tasteless decorum. Every surface had been covered in lacy throws, and filled with ornamental plates with cat pictures on them. That, coupled with the vases of dried flowers, made the room rather unappealing.

It seemed to Harry that Professor Uzumaki was a completely different story; a story unfolded across the walls of his own office. Harry's eyes danced around the room, attempting to take in as much as possible before he was forced to talk to his new Professor.

There were two bookcases along one wall, each packed with a variety of different books. A quick glance informed Harry that most of the books were focused upon Defence Against the Dark Arts, titles ranging from things such as "Dark Arts: An In-Depth Thesis", "Complex Protection and Defensive Magics" and "Dark Magic: A Compendium of Curses, Hexes and Jinxes". There were also several books Harry could not determine the title of, either because the writing was so faded that it could not be read or because they bore no title along the spine. The consistent thing each of these books had in common was the fact that they looked extremely old.

"No doubt Hermione would love to get a hold on some of them."

When Harry looked across from that wall his eyes fell on something he had never seen in any of the previous teachers décor, nor had heard discussed within any defence class; weapons. The majority of one wall was dedicated to them, all shapes and sizes and in a variety of conditions. Even from where he was standing Harry could see the notches upon some of the larger blades, and it was with a shiver that a single realisation hit him.

"He's used them all."

He turned to his Professor with a quizzical look, realising he hadn't spoken once since Harry entered the room. His eyes were upon Harry, and he seemed to be waiting for him to speak. Pushing his questions about the décor from his mind, Harry set himself to ask the one he had come here with originally.

"Professor…I need your help." He said, almost whispered to the room rather than to the man watching him.

He was met with only silence, his Professor still staring at him questioningly. After several moments, when Harry realised that he was not going to say anything, Harry continued.

"You see, I need to start my training as soon as possible. I keep losing control and… I'm scared."

Again he was met by silence, however Harry was pleased to notice the change in his Professor's expression. Silently the man walked forwards, striding across the room in what Harry considered being a very Snape-esque manner, towards his desk beside the window.

It was an ornate desk, very different from the ones owned by the other teachers, and Harry wondered briefly if Professor Uzumaki had brought it with him from wherever he had come from. Each leg of the table was ornately carved with symbols and designs, and from the glance Harry was able to catch of the inside drawer as the Professor removed some Parchment from it; they were lined with a dark red velvet.

Harry looked towards the Professor in silence, the man seeming too engrossed in the parchment he was reading to notice. It seemed hours before he finally placed it casually and turned his gaze upon Harry.

"Your training is not supposed to start until the beginning of the new school year." He said in an extremely nonchalant tone that almost surprised Harry.

For a second there was complete silence in the room, and Harry felt the sudden desire to play with a thread on his jumper. He had already tangled the wool several times around his finger before his Professor spoke again.

"Is there a particular reason you want to start your training early?" he asked, voice remaining nonchalant, though Harry did not miss the undercurrent that came along with the question. For some reason the need to keep up appearances reminded him suddenly of Malfoy.

Harry considered how to answer for a second. It had been easy asking to have his lessons begin immediately; to explain that he needed this because he kept inadvertently blowing things up when he was angry was a very different story.

"Well…you know what happened during the summer with the explosion at my relatives house?" he asked.

His only answer was a nod; curt and almost indistinguishable. It was a small indication that he was informed of the events that transpired upon the unsealing of the Sharingan.

"Well, after that day in Professor Dumbledore's office when I collapsed, I was taken somewhere else to heal..." he paused, realising he'd been about to talk about things nobody outside of the Order should know. He had his suspicions that Professor Uzumaki may be a new member, however he had forgotten to confirm his suspicions with Ron.

"You were taken to Grimmauld Place, were you not?" he said, shattering Harry's thoughts. It is more of a statement than a question, but nonetheless Harry was glad to know that his teacher knew about the Order.

"Yes Sir. Well, after I was taken to Grimmauld Place I found out about some of the things that happened with Voldemort and the attacks and…"

Harry didn't have a clue how to continue, and he took a moment to wonder what to say. He had been surprised when he spoke and noticed that Professor Uzumaki did not show any sign of panic, fear or disgust at the sound of Voldemort's name. Looking at the floor as though suddenly interested in it, Harry decided just to say what had happened.

"Well, when I was there I lost control again… it wasn't as strong as last time but I think I managed to blow up a whole wall. I almost hurt one of my best friends." Harry said, looking up.

"Did I say something wrong?"

Professor Uzumaki looked pale, as though every drop of blood had fallen from his face. His eyes were wide, staring at Harry in a sense of utter disbelief, mingled within which Harry could clearly see fear.

"You… blew up a wall?" he asked, voice almost panicked.

"Yes Sir."

"You're positive?"

Harry nodded mutely, disturbed by the look on Professor Uzumaki's face. His questions had come fast, his voice almost begging for them to be contradicted. Still look on Professor Uzumaki's face made him look as though he did not completely believe Harry, or at least he did not want to. After several seconds of pliable silence, Professor Uzumaki walked slowly towards Harry.

"What exactly happened when you lost control." He said, shocking Harry with the unusual amount of enthusiasm in his voice. Until Harry had mentioned the wall he had seemed bored, almost monosyllabic. When Harry's lack of control had been brought to attention he seemed shocked, disbelieving and frightened. Now he looked excited and terrified all at once, and he asked his question with a newfound vigour.

For the next half hour, Harry sat in front of Professor Uzumaki's desk explaining exactly what had happened since he arrived at Grimmauld Place. At first, he had been hesitant on talking about the occurrence with Kreacher, but since his assumption was that his emotions had made him lose control, he did not think it right to leave out something that could be vitally important, and settled for a brief explination of what had occured.

When he finished his story. Professor Uzumaki sat looking at him for several more minutes before removing a quill and parchment from his desk. The silence that now filled the room was broken only by the scratching of quill upon parchment as Professor Uzumaki wrote something upon the parchment before taking it to the fireplace. Harry watched Professor Uzumaki take a handful of Floo Powder, whisper somehing into the now emerald flames before throwing in the letter, which promptly dissappeared, returning the flames to normal as it left.

"I wonder who was he sending a note to?"

"We're going to perform a test. It shouldn't hurt, I just want to see if we can force your Sharingan to surface again like it did in Grimmauld Place. First though, you must understand exactly why I am surprised by the effects your Sharingan has." Said Professor Uzumaki.

"Alright Professor."

"Sasuke." Said the man, returning to his desk and sitting in front of Harry without looking up. Harry was left wondering what he had meant - surely he wasn't expecting him to call him by his first name? Harry still wasn't used to even calling Remus by his first name, and he hadn't taught Harry in three years.

"For you to understand you'll need to know a bit about the Sharingan itself. For the most part Professor Dumbledore's explination of its creation and abilities were correct, however there were quite a few points that he was wrong upon."

Professor Uzumaki paused, settling back into his chair and knitting his hands together,all the wile with his eyes locked on Harry's. Harry was slightly uncomfortable with the searching look, but he refused to look away as the Professor continued his explination.

"The Sharingan was developed, as Professor Dumbledore said, one hundred and seventy three years ago. It is not simply an ability, it is a branch of magic completely different from normal wizardry, though that is where its roots lie. The Sharingan has its own spells, its own rules - when learning to control it your knowlege of wizardry will only help you so far. Contrary to what Professor Dumbledore said the wandless abilities of those of Advanced Bloodline are not limited to the use of the seal system." said Professor Uzumaki, and with a wave of his hand and a muttered incantation the inkpot upon his desk rose slowly into the air, where it floated for several seconds before being lowered gently back onto the desk. "As you see, Wizarding spells can be cast as simply wandlessly as with a wand for those like us, though as I said when you train your knowledge of wizarding magic will only take you so far. Knowing how to cast a spell with a wand will not automatically give you the knowledge needed to perform it without a wand. When your training begins you will find channeling magic through your hands extrmely difficult, and even more tiring. You will have to begin with the basics, as you did with your wand, until you can control the use of wandless magic to an extent. Once mastered however, it is much simpler to channel spells through your hand than through your wand. The seal system is a different matter, it is reserved for spells that only those of Advanced Bloodline are able to cast - the ones designed by us for our own use - that cannot be cast with a wand. In total there are twelve seals you will have to master, and learn to use in combination. Also you should know, at the time the seal system was implemented another restriction was placed upon us. Those curses which are deemed Unforgivable are disabled from being cast wandlessly, with or without the use of seals. There are five curses in Japan that were deemed Unforgivable, though I am not sure whether your family would have been bound under Japanese or British law, so you may be able to perform two of them, though I will not be teaching them. Now I must ask, have you ever seen your own Sharingan?"

Harry shook his head slowly. His head hurt from all the information he was trying to process and he was sure he would need to see Madame Pomfrey by the end of the day for a potion to deal with it.

For several seconds there was silence. Professor Uzumaki seemed to have drifted off as he drew his eyes away from Harry's and stared at the table in front of him. Harry could not see much of his face, obscured by the black hair falling in front of it, and it was only then he realised how long it actually was. A few moments later Harry gasped as his Professor brought his eyes up to meet Harry's.

"Is this… Sharingan?"

Sasuke's eyes were red, from the pupil out through the iris. Each eye had three tiny dots, nestled among the iris and surrounding the pupil, and Harry found his own eyes drawn to them. They were black, almost darker than the pupil itself.

"Yes, this is the Sharingan, though your own will most likely be slightly different. You see the dots in each eye? The technical name for them are Tenketsu, a word believed until eighteen years ago, to be a mistranslation within the records of the Sharingan."

Harry looked at him blankly and Professor Uzumaki smiled slightly, the first time Harry had seen him do so.

"You see the word Tenketsu was created to describe the points in the iris when the Sharingan is active. According to the records the translation was 'points from which magical energy is emitted'.

Finally Harry felt the need to ask a question, completely confused by everything that his teacher was saying.

"But sir I don't understand why people didn't understand it. Why did they think it was a mistranslation, isn't the meaning a bit obvious?"

Professor Uzumaki laughed quietly, eyes suddenly looking heavy and filled with pain.

"What you fail to understand is that the Sharingan is an absorption technique; there is no way it can emit any sort of energy, only absorb it. This is why bearers of the Sharingan are able to learn a spell by simply seeing it."

Harry had frozen over after the first sentence.

"If there's no way for the Sharingan to emit then how…"

"The word Tenketsu," the Professor interrupted, "was not understood until eighteen years ago when a Sharingan-bearing child mastered the use of the Sharingan at age seven. He bore the most powerful Sharingan recorded, and what made it more so was his ability to emit energy from it as well as absorb things in the normal method of the Sharingan. He was hailed as prodigy, finally bringing understanding to the word in the records. You might not believe it, but he was an ANBU squad leader at the age of thirteen."

Harry looked quizzically at Professor Uzumaki, waiting for further insight into his last statement. He assumed whatever an ANBU was it was a high title, and it seemed to be almost impossible to gain it at such a young age.

"ANBU are the equivalent of your Aurors. They are the elite and this child was made a squad leader at thirteen; the youngest ever."

Harry felt his spine tingling at the very thought of it; a boy three years younger than him being made an Auror squad leader. Choosing to fight Dark Wizards as an occupation at such a young age, and being allowed to. Whoever this boy was, there was no doubt that he must be powerful.

"Sadly, the boy was corrupted by the power that he had and the responsibilities laid upon his shoulders. Several months after becoming an ANBU he slaughtered almost every bearer of the Sharingan. I was the only bearer left alive. I was seven years old at the time." said Professor Uzumaki, his voice almost cracking. His face remained emotionless but his eyes, from which the Sharingan had faded unnoticed by Harry, were filled with pain.

Harry was shocked beyond words, and it was with great effort that he managed to ask a single question.

"How did you manage to survive?" he said, feeling Professor Uzumaki freeze as the words left his lips.

For a moment there was silence, complete and uncomfortable. Then, Professor Uzumaki began to laugh. Harry did not think he had ever heard a more spine-tingling laugh ever before, as though the man was mocking everything around him and everything they were talking about.

After the laugh had faded, Professor Uzumaki looked up at Harry, shocking the boy with the unshed tears within his deep blue eyes.

"I did not survive," he almost spat, "I was allowed to live. You see, the boy's name was Uchiha Itachi. He was my older brother."

Everything fell into place suddenly; the laugh, the tears. But something still bothered Harry, and that was the words that had only just left Professor Uzumaki's lips. It was not for several seconds that he realised why.

"He was my older brother"

"Today, there is supposedly only one bearer of the Sharingan; the last of the Uchiha family"

"So… He's dead then?" asked Harry quietly.

If Harry had thought the room seemed cold before, it was nothing compared to now. The oxygen seemed to disappear from around him and he fought desperately to look anywhere other than at the man in front of him. In the end it was useless, and their eyes locked as the Professor made to speak again.

"Yes, he is dead. I was the one who killed him, eight years ago… that was when I left."

Professor Uzumaki rose from his seat, staring out of the window in complete silence. Harry remained seated, contemplating everything he had been told in the past few minutes. After hearing everything said, Harry found himself wondering exactly how powerful his new Professor was.

"I would start your training today if I could. Leaving it until the beginning of term would have been fine, but from what you have told me there is no possible way to leave it without endangering the people around you. Sadly, I do not yet have the facilities or equipment needed to begin, but I will try to get them as soon as possible. I could…"

Harry had jumped to his feet, the idea already running through his head. Equipment and space were easy to find in Hogwarts, especially if one knew where to look. And Harry was well aware of a room that could offer them everything they needed.

Fifteen minutes later they were walking along the seventh floor, the only sound being their own footsteps as Harry lead Professor Uzumaki to the Room of Requirement. He hadn't told his teacher where they were going, and he was sure the man was confused.

When they stopped at the tapestry of Barnabus the Balmy attempting to teach trolls how to ballet dance, Harry noticed the confused look his Professor was giving the tapestry after realising it was the only thing in the corridor. Harry laughed inwardly and then began to concentrate.

He pictured the room they had used last year for the meeting place of the DA; shelves of books and mats on the floor and tables and dark detectors. He let his mind open and the memories wash over him, and as they did he began to pace. Three times he walked back and forth, and he was rewarded by the appearance of a door in the wall opposite the tapestry.

Professor Uzumaki was still examining the tapestry, seemingly intent on finding out why they were standing in front of it. Harry nearly laughed when he watched Sasuke draw his wand.

"Umm… Professor." He said, trying to keep the amusement out of his voice.

Sasuke swirled round, faster than Harry would have believed possible. Harry saw his eyes widen slightly, almost unnoticabley, as he spotted the door. Harry almost laughed when Professor Uzumaki sent him a mild glare; clearly annoyed that Harry had allowed him to examine the tapestry for so long without reason.

"I thought I told you, call me Sasuke." He said bluntly, walking past Harry and opening the door. He motioned Harry inside and closed the door behind them.

Harry looked around the room, a sense of welcoming in its familiarity. He remembered the bookshelves exactly, and was surprised to see the pile of parchment he had left there after his brisk escape from the room when Dobby had warned him of Professor Umbridge coming for them.

"Will this be ok Prof… Sasuke?" asked Harry, voice faltering as he said his Professors name out loud for the first time. It was a strange sensation, bringing with it a new level of familiarity that Harry was not sure he was comfortable with yet. Sasuke didn't seem to notice however, too busy examining the room.

Sasuke was walking around the room, eyes looking at everything in turn. He pressed firmly against the mats and glanced briefly across the bookshelves before turning to Harry.

"Yes, this should be enough. There are a few more items that I will require, but most of them are either one of a kind or need to be extremely personalised before they can be used. Anyway, for now, let's begin your training."

He moved to one of the mats, motioning for Harry to stand across from him.

Harry walked and stood across from Sasuke, watching him as he removed his robes. The clothes underneath were very obviously made for fighting in, and Harry wondered if Sasuke wore such clothes constantly. The shirt had extremely short sleeves that only just covered Sasuke's shoulders, showing off the strange tattoo on his left arm. The trousers looked fitted, though Harry could tell the material was not binding. They were held up with an unneccesary belt through which Sasuke's wand was hooked, along with a small, black-metal knife. Slowly Sasuke withdrew his wand, and Harry quickly did likewise, and gasped when he looked up at Sasuke.

The man was standing in front of him, Sharingan visible completely.

"Are you ready?" he asked, completely calm and seemingly unaware of the tension coursing through Harry's body.

As Harry nodded apprehensively and moved into the customary deulling position he had learned in his second year. Sasuke's eyes widened. Harry noticed it after a moment, slowly at first but betting faster. The Tenketsu were moving, spiralling around Sasuke's pupil so fast that eventually all that could be seen was a solid, black ring

"Then let us begin."


A/N: Revised Chapter 3. Quite a lot to change in this one. I didn't like the original scene that took place in the Room of Requirement, but I like it better now (even if it's not what I wanted to happen, but that wouldn't have worked anyway).