Note: 5900 hits. Thanks a lot guys.

Kakashi couldn't sleep at all that night. The howling winds outside were too loud in his bedroom, and the coldness of his room, even under the blankets, were making him shiver. Instead of resting like he was supposed to do, he summoned up his Nin-dogs and Kage Bunshin and told them to patrol the whole school.

It was maybe around halfway until one in the morning. Kakashi decided to go outside. He bundled up with the red and gold Gryffindor scarf McGonagall-san gave him and quietly sneaked out into the Grounds.

The full moon's light was reflected on the Lake's pristine surface. Kakashi stared at the full moon thoughtfully. It had been a full moon too, when Kyuubi attacked. Some said that the full moon awakened deep aggression in animals…

There was a slight sound of a wolf howling, but it was different at the same time. For one, this howl was hoarse and vaguely human. This howl was strained, and seemingly came from far away. He knew how a wolf howled because his father was famed for it; he could summon a huge white wolf.

Kakashi froze and turned.

There was something running across the Grounds; something quadruped and furred. The smell of wolf came to Kakashi's nose, mixed slightly with the scent of human. Two yellow-gold eyes stared at Kakashi as the creature came to a stop in front of the ANBU. The thing looked vaguely like a wolf, but it was as tall as a man, with the human build of a man.

The wolf-man howled and leapt at the ANBU.

Kakashi cursed and backed away.

The guard looked apprehensive today. Harry observed him from the Gryffindor table. His leg had a slight limp to it, and he seemed exhausted, but over all, he seemed like he had tried to wrestle a Hippogriff. There were rips in the fabric of his jacket, and beneath it Harry could see small gashes in the bone-white armor that the guard wore underneath.

Kakashi observed the Potter boy as he gasped, breathing for air. The wolf-man hadn't hurt him, as far as Kakashi was concerned. His armor had taken most of the abuse, and he needed new arm-guards; the old ones the wolf-man had ripped off. Eventually, he had used the Sharingan to escape, luring the wolf-man into a genjutsu to get his attention. At this stupid animalistic state, the wolf-man couldn't possibly realize the difference between reality and an illusion.

The genjutsu would wear off in the morning. For now, Kakashi was resting against the wall. He briefly took out his wand and pointed it at his jacket and armor, murmuring the spell-word softly.

"Reparo."

The armor patched itself up as Kakashi stared at his jacket. Black threads realigned with each other and melted into one, pulling each side closer to cover the rip. He felt exhausted, to be sure. But it was the Potter gaki's game today, though Kakashi wasn't sure if he'd be able to play. The sound of thunder rumbling overhead confirmed that suspicion, as well as the pounding of the wind against the castle walls.

The Potter boy looked at him, worried, piece of toast halfway to his still open mouth. Kakashi almost laughed at how stupid the boy looked.

"You okay?" The Potter boy asked. Kakashi nodded and rested against the wall. He only needed a breather. He'd left the wolf-man chasing some imaginary stag in that genjutsu.

Potter boy's Quidditch team arrived downstairs. Kakashi put his hands into his pockets as the rest of his Henge'd Kage Bunshins turned up.

He'd have to cancel today's ADA (What he'd taken to calling his Saturday lessons). He felt too tired from wrestling with the wolf-man, that and he'd have to guard the Potter boy during today's Quidditch match.

The match had begun. Kakashi held the large black umbrella against the furious wind with both hands. He felt cold now, but he kept his eyes on the Potter boy. The rain pelted his mask furiously; droplets of water streaking down the porcelain like tears. It was this mask that was the reason that Kakashi was able to see in this rain; he'd cast the Impervius spell on it right before stepping outside. The rest of his body he had let a small amount of chakra flow out of his tenkutsus, creating a thin, but waterproof wall of chakra, preventing him from getting wet from the rain. The umbrella was just for show, he was ordered not to reveal his true abilities until the last moment.

The Potter boy's Quidditch captain ordered a timeout. Kakashi pointed his wand at the umbrella he was holding and murmured the spell-word.

"Engorgio."

The umbrella grew twice its size and Kakashi was able to shelter the whole Gryffindor Quidditch team under it. They talked of strategy; the Wood boy was telling Potter to get the Snitch quick, while Granger arrived and did the same spell Kakashi did on his mask on Potter's glasses.

The timeout ended and Kakashi was once again left standing alone on the sidelines of the field.

The first thing Kakashi noticed was the huge black dog that was staring at the Potter boy. His Kage Bunshins (positioned on each and every tower; the rain was too thick for the majority of the school to even notice that the guard had suddenly multiplied) had passed the word onto each other until one Kage dropped down and told him.

Kakashi gave the umbrella to his Bunshin, told him to keep the umbrella for a moment and quickly formed seals.

Kakashi ended his Jutsu with the Bird seal; his hands were pointed in the general direction of where the Kage Bunshin had told him the black dog was, they had left a kunai with a special Jutsu on it as his guide.

"Shunshin no Jutsu!"

He felt his surroundings warp for a moment and found himself in front of the black dog a second later.

Kakashi took out his kunai and ran after the dog.

The dog turned tail and ran down the stairs.

It was quite obvious the dog wasn't actually a dog. Being around dogs his whole life, Kakashi knew how a dog acted. For one, this dog didn't bark or growl at his appearance. It simply ran away. Another thing was this dog didn't smell quite like dog; there was a vague human scent on it. Even if a human touched the dog, it would only last for a few minutes, then fade as the dog's natural smell took over.

This dog was not a dog.

Kakashi took out four shuriken from his holster, took precise aim and then threw the throwing stars accurately, while his other hand took out the makabishi, throwing spikes, and threw them in front of the dog.

The four shuriken lodged themselves deep in all four of the dog's paws. The makabishi had successfully stopped the dog from going any further, and the trapped animal made no sound as it tried to squirm out of the shurikens, despite the pain.

Kakashi positioned the kunai carefully near the dog's throat.

"You're not a real dog." He spoke, accusingly.

The dog squirmed. Kakashi pressed the sharpened edge of the kunai on the dog's black furred throat. He gathered up the makabishi and put the spikes back into his pocket as he positioned himself in front of the dog.

"There's no use trying to act like you're a dog. I found it out. You smell like man."

The dog convulsed and transformed into a man. Kakashi was mildly shocked, but he knew this Jutsu. It was McGonagall-san's Jutsu.

This man was an Animagus.

The man was soaking wet. Broken chains were on his wrists, the four shurikens deeply embedded in his hands and feet. Black and white striped clothing made it clear that the man was a prisoner, and the elbow length hair made him even more like the prisoner he clearly was.

"Sirius Black." Kakashi spoke. "Wanted for the murder of thirteen people with a single curse. Cleared for the Dementor's Kiss."

The man glared at him with savage eyes. "I didn't kill those people." This statement amused the ANBU. Denial only made the lie worse.

"Sure you didn't. What are you doing here Black?" Kakashi asked, voice hard. He dug the kunai closer to Black's throat.

"Who are you anyway?" Black's rude question nearly startled him. "You're not using a wand."

Kakashi smirked behind the mask. "Why do you want to know?"

The Black had the guts to shrug in his position. "I just wanted to know why a guard of Hogwarts uses puny knives, but not a wand."

Kakashi raised an eyebrow at this reply, but he kept silent. After a few seconds, he cleared his throat.

"You have no name,

You have no feelings,

You have no past,

You have no future."

Kakashi paused, remembering the adage of the ANBU, the one that was the slightly edited version of one of the disbanded ANBU branches. Sirius Black was still.

"What you have is your mission,

That which supports the great tree of Konoha, unseen from within the ground,

Is our organization called 'ANBU'."

Black stared at him for a few moments, then blurted out rather loudly. "But that doesn't answer my question!"

Kakashi almost smiled. "It answered your first one."

Black scowled. "I'm only here to commit the murder I was imprisoned for. Let me go." He growled.

Kakashi looked at him and withdrew the kunai, twirling it around a finger and tucking it into his kunai pouch.

"Maybe, maybe not." Kakashi tilted his mask to the side, letting Black see his closed left eye.

"What are you doing?" Black asked suspiciously.

Kakashi gave a grim chuckle. "It's one of the many ways that I have at my disposal…"

Kakashi opened his eye. The blood red eye of the Uchiha clan gazed into Sirius Black's blue eyes. The three tomoes turned, spinning in a hypnotizing circle. The last remaining Black stared deep into the crimson eye. With every second he spent staring at it, he was drawn deeper into the hypnotic gaze of the Sharingan.

"Tell me." Kakashi's voice began. "Tell me everything."

Black's mouth moved, and Kakashi found himself listening. On how he knew James Potter in school…

Abruptly, Kakashi was disturbed by a wave of cold descending on him. He felt the freezing ice that gripped his heart for a moment before the feeling passed away.

Kakashi let go of the still hypnotized convict and turned around in a state of cold panic.

Dementors. He had been told of them. These were the shadowy beings that guarded Azkaban. Dumbledore-sensei had told him a Patronus would keep these away, but no one knew how to kill these things.

Kakashi turned back to Black. The convict was shivering. It appeared the Dementors affected him too.

Kakashi pulled out the four shuriken and ran outside. Were the Dementors here for the Potter boy? Dumbledore had told him that the Dementors fed on happy memories, that these things seemed to like it when their prey was squirming, screaming their hearts out.

From Potter boy's background, Kakashi thought that the Dementors love him especially.

Another cold feeling came over him. Icy hands as cold as death gripped his face. A Dementor was holding his face with its rotting hands, it appeared in his distraction, it had managed to sneak up on him.

"That's enough, its okay Kakashi…The right side of my body is almost smashed…there's no feeling in it…"

Obito.

"It's okay 'Kashi-kun…I know I'm dying. I've worked so hard, healing the living, that I've forgotten that…I was too tired to dodge."

Rin.

"The Village…has to see that Uzumaki Naruto is a hero. Do you understand that, 'Kashi? Don't hate him because I'm going to die…"

Sensei.

Their voices, over and over again, repeating in his head like some sick and twisted echo from a far away bell.

Then his own voice, filled with pain, shame and regret.

"What kind of commander? What kind of Jounin am I?"

He knew when he had said that. Obito was dying then…

In panic, Kakashi's hand formed seals, even as the Dementor neared his own face, the icy cold gripping him like never before.

White lightning gathered in his hand, the chakra flowing in it, waiting to be unleashed.

Kakashi finished the last seal, even as the final voices of his dead comrades reached his mind.

"It's not useless baggage…it's this Sharingan of mine…"

"Kakashi, don't hate me for what I'm going to do."

"There's no point in trying to put out Kyuubi's fire...Don't cry, 'Kashi-kun"

"RAIKIRI!" Kakashi screamed, driving his fist right into the Dementor.