AN: yay I've finally gotten around to posting something! WooHoo! This is my first fanfic so please be nice. I appreciate constructive criticism but flames will be used to burn themselves.

To the updating schedule, I will try to update at least once a month. No promises though. I have the next chapter written, but I don't know when I'll be able to type it out. I am a freshman in a magnet high school so I have a lot of work I have to keep up with. I will keep working on this story in my notebook though.

Disclaimer: I do not own Bleach or Harry Potter. They belong to Tite Kubo and J.K. Rowling, respectively.

Enjoy!

(edit: My new beta has gone over this chapter and I have reposted it. There are no plot changes, just some continuity and phrasing fixes)

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"Mugetsu." Ichigo called sharply. Unleashing a black wave of destruction aimed dead on at Aizen, it was far to fast for the monster to dodge, but he didn't need to in the end. A bright flash of light obscured the area.

"Is that the best you can do, Kurosaki Ichigo?" Aizen mocked as the dust began to settle, the bastard had evolved again. Ichigo eyed his new form for a moment. Unbearable exhaustion threatening to close in on him, his strength spent on Mugetsu, he hadn't thought Aizen could get any uglier. Clearly he was wrong. Tensa Zangetsu's voice cut through the fog in his mind a moment later, it was tinged with nearly as much exhaustion as ichigo's own thoughts.

"Ichigo… I did not want it to come to this… but all hope is not lost."

"There's still something else Tensa? We've come this far, tell me what I have to do!" Ichigo was relying on instinct alone now to dodge or block Aizen's attacks as the monster pounced. a razor sharp claw tearing through the space Ichigo had vacated a moment before.

"You must completely merge with me to become the new Zangetsu and take my place."

"We can do something like that? How?" he asked, mystified at the idea. As he thought this, Aizen got inside his guard and delivered a slash from right shoulder to left hip. Only a hurried backwards Shunpo saved him from being completely cut in half. As it was, the wound was deep and blood poured down his chest. Ichigo landed on the ground heavily, and stabbed Tensa Zangetsu into the ground as a wave of agony threatened to drop him to his knees. He raised his head to glare at the demonic form of Aizen made hazy by blood loss.

"Have you reached your limit, Kurosaki Ichigo?" he taunted, his momentary terror at Ichigo's power well gone. "It doesn't matter anyway. Even if you had enough power to defeat me I would only evolve once more to become even more powerful." Aizen said as he slowly crossed the distance between them. Ichigo grimaced internally knowing the bastard was right.

"He's right. I can't hope to beat him now; I can already feel my Shinigami powers fading. Pretty soon I'll be an ordinary human again." he thought despair overriding his determination.

"It's starting to rain, Ichigo." Tensa said grimly, but Ichigo couldn't hear him over the roaring of the rain. As Ichigo turned to run, Aizen was suddenly there and slashing at his ankles. Ichigo gasped in pain as he fell, unable to even walk without extreme pain and forcibly removed from his Bankai.

Die, Kurosaki Ichigo!" Aizen said as his sword fell toward Ichigo's neck, he was done playing now.

"S-Shit! I can't move in time!"As he watched, Aizen's sword slowed to a crawl and he was pulled into his inner world.

(O.O)

Ichigo opened his eyes to discover his hollow and Zangetsu soaking wet. He stared a little puzzled, wondering when they had sparated before figuring it had something to do with his powers fading or getting knocked out of bankai. Shiro's head snapped up and he stopped his angry pacing when he felt Ichigo's gaze on him, trademark insane grin strangely absent.

"Damn it King! You're so weak! There were plenty of times you could've killed him! But you didn't! And now-"

"That's enough, Shiro." Zangetsu quietly interrupted. "We can still win this fight." He turned to address Ichigo. "All Shinigami can partially merge with their Zanpakuto for a short time, but not many have the capacity to completely merge with their Zanpakuto to become the new Zanpakuto Spirit."

"Let me guess," Ichigo sighed, "I'm one of the few who have this potential."Zangetsu smirked, expression strange on his normally composed face.

"Correct, but it will be very risky."

"Everything I've done has had some sort of risk attached to it, whether I knew about it or not. This is no different." The rain lightened a bit as he said this. Zangetsu smiled slightly before continuing.

"This will be exponentially more dangerous than anything you have done before. You will be completely merging with both of us; me and Shiro. Your soul might not be able to handle the stress."

Ichigo smirked. "We're going to die anyway if we don't at least try. We have nothing to lose." he countered, Shiro laughed.

"Well said Aibou." he shook his head. "I'm not looking forward to this."

"We don't really have a choice, Shiro."

"I know that!" the hollow snapped, gold eyes narrowed. "Doesn't mean I have to like it," Shiro growled, closing his eyes. Without another word Shiro began glowing black and red and Zangetsu pale blue. As the glow gradually overcame their natural colors, Ichigo looked on in awe. A few seconds later, Zangetsu looked like a blue sun and Shiro a black hole. They stepped forward and placed their hands on Ichigo's chest.

"Sorry Ichigo, this may hurt a bit." Ichigo couldn't hold back a scream as his body erupted in blue and black reiatsu.

When it faded, Ichigo crawled to his hands and knees. (When did I fall?)

"Whoa…."

(O.O)

I hope you liked it! Please review! You'll be hugged by Harribel, Orihime, Ichigo, or Grimmkitty (your choice) if you do! (Not to mention it will make me write faster)