This is my 1st crossover, so be nice! Instructive criticism is greatly appreciated. If you're curious about my OC Shouta's relationship with Shiro-chan, I'll be posting a story soon explaining their past, etc. So I'm sorry if you're confused.

And I do NOT own Bleach and/or Harry Potter, etc. etc. etc.

"HITSUGAYA!" Screeched the boy as he burst into the room. Panting, Izukai Shouta stumbled to the desk of the 10th Division Captain, setting down the papers in his hand, before collapsing onto the couch. He ran a hand through his unkempt brown hair, closing his emerald green eyes.

"I'm guessing this letter's important?" Hitsugaya Toshiro asked, raising an eyebrow. The boy just nodded. Sighing, the snowy-haired Captain set down the paperwork he was currently working on before grabbing the papers. As he read over the document, the room steadily got colder and colder, his hands gripping the paper tighter and tighter. Throwing the papers into the trash, he looked up at Shouta with his infamous death glare. "What is the meaning of this, Izukai?" The room's temperature plummeted several degrees, and frost started to form in the room.

"Hey, hey. Don't look at me. I may be a former murderer, but I'm definitely not stupid enough to pull a prank on you. Only Matsumoto would do that. Besides, it's an order directly from the Head Captain himself. His Lieutenant's the one who gave me the letter, before telling me to go around collecting signatures from all Captains and Lieutenants." The temperature became slightly warmer, and the frost melted, though there was still a slight breeze. Sighing, Hitsugaya sat back down, rubbing his temples.

"CAPTAIN!" Shouted an all-too-familiar voice a moment later. 2 seconds after, Lieutenant Matsumoto Rangiku burst into the room, not pausing for a moment as she raced to her Captain, sweeping him up into a death hug. "I can't believe you're leaving for a year! I'll miss you so much!" She squealed, twirling around while suffocating her Captain.

"Matsumoto! Put him down before he suffocates!" Shouta called, laughing as she released the Captain from her grip. It took a few seconds for Hitsugaya to catch his breath, before he glared up at his Lieutenant. He was walking back to his desk when he found an odd envelope on top of the desk. He looked at it curiously, before opening the letter.

HOGWARTS SCHOOL of WITCHCRAFT and WIZARDRY

Headmaster: ALBUS DUMBLEDORE

(Order of Merlin, First Class, Grand Sorc., Chf. Warlock,

Supreme Mugwump, International Confed. of Wizards)

Dear Toshiro Hitsugaya,

We are pleased to inform you that you have been accepted atHogwarts School of Witchcraft and Wizardry. Please find enclosed a list of all necessary books and equipment.

Term begins on September 1. We await your owl by no later than July 31.

Yours sincerely,

Minerva McGonagall

The Captain stared at the letter for a moment longer, before immediately glaring up at Rangiku. "Matsumoto…" He growled, his voice icy.

"It wasn't me this time! Honest!" She whined, waving her hands up in front of her.

"It's true." Shouta agreed, holding up a similar letter of his own. "I got this while I was getting a signature from Ukitake." Hitsugaya glared at his lieutenant a moment longer, before sighing and sitting at his desk.

"Might as well finish this while I can." He muttered, grabbing another paper off of the 'unfinished' pile.

At some point, Rangiku disappeared, saying she had to do something. For once, Hitsugaya ignored it. 'He must be really annoyed, if he ignores even Matsumoto.' Shouta mused, deciding he might as well give himself something to do and try finishing the Lieutenant's paperwork.

A couple hours later, Hitsugaya sighed and reluctantly stood up. He grabbed Hyorinmaru and headed for the door. Right before he left, he turned to the brunette seated at the couch. "If you got one of those letters, you should come as well, Izukai." Glancing up, the boy nodded, before standing up as well.

The 2 of them flash stepped to the 12th Division labs, both silently dreading their arrival. They arrived at the strange lab, where they were greeted by the creepy face of Kurotsuchi Mayuri. "Welcome you two. I assume you're here for your mission?" He asked, smiling in a sickeningly way. They both hesitantly nodded. "Great! Then follow me!" He dragged them through the room into a secluded corner, where, laying on a surgical table, were 2 gigais. Both were wearing casual clothes, most likely provided by Rangiku.

"You'll find that these gigais are much more comfortable and much, much stronger, seeing as you'll be in them for an entire year, if not longer. They've also been adjusted to suit that of a 2nd year." Mayuri explained, watching as Shouta climbed into his gigai.

"You're right. It feels great." Shouta said in surprise, walking around and doing a couple cartwheels. He then glanced at Hitsugaya's gigai in confusion. "Why is Hitsugaya's so tall?"

"Like I said, the gigais have been adjusted to suit that of a 2nd year. Don't worry, once you'll get in it, you'll be fine. Might feel a bit of a stretch though." Hitsugaya eyed the man warily as he climbed into his gigai.

Right after, there was a painful-sounding snap, where afterwards the snowy-haired captain shouted out in pain. Mayuri grinned gleefully at the now tall Captain Hitsugaya Toshiro, his face scrunched in pain. "What the hell just happened?" Shouta asked, confused.

"You'll be sore for a couple days, but the effects will wear off soon." Mayuri continued, ignoring the brunette's question. Hitsugaya, stunned, slowly looked at his lean, muscular build in the mirror that had appeared mysteriously just moments ago. "Also, you'll still be able to use your zanpaktou and kido in this gigai, and both will be visible to humans, wizards and the like. So, I have created a way to hide your zanpaktou so you can carry it wherever. And lastly, you'll be under the guise as transfer students from Japan, so you'll need to know all spells and other information concerning Japanese Wizards and a few other such things. So if you'll stay still while I put this information in you…" Mayuri grinned evilly, holding up a needle as long as Hitsugaya used to be, a sickening green liquid dripping from the tip.

Both Captain and Izukai heir raced from the room, only to be stopped by Kenpachi and Unohana. "Sorry, but we were ordered to hold you down." Unohana said, smiling her 'evil smile'. And the screams from the 12th Division that became the start of the rumor about Captain Kurotsuchi were once again heard throughout the Seireitei.

"Look, isn't that the heir to the Izukai family?"

"You mean that prestigious family? The one with relations to the Soul King?"

"Yes, but they're also famous in the world of the living too. I heard they've got enough money to rival the king of England."

"But isn't the heir also the one who got arrested as Green, that international serial killer? They say he was released for self-defense."

"Really? Scary."

"Izukai! Izukai!" A distant voice shouted. Shouta opened his eyes, his eyes slowly coming into focus. "Izukai! Wake up! We have to get going!"

"Hitsugaya? What…?" He muttered, sitting up. His head throbbed painfully as he looked around, realizing he was back in the 10th Division office.

"You passed out after Kurotsuchi almost killed you with that needle. Matsumoto's already packed for us, we have to get going." Hitsugaya explained, helping his friend up. Shouta blinked, looking at the snowy-haired Captain in surprise.

"When'd you get so tall?" Hitsugaya looked at him in an expression saying, really? "Oh. Right."

A few minutes later, the 2 of them stood in front of the Senkaimon along with the Head Captain, Captain Kurotsuchi, and Lieutenant Matsumoto. "Remember, no one can know of your true identity. Not even the Headmaster." Both boys nodded. "Well then, good luck to you both. And remember, watch out for dementors as well as... that man."

"Is that all?" Yamamoto nodded.

"And remember, Captain Hitsugaya, every time you get back in your gigai, you'll feel that same pain." Mayuri warned, though he looked more like he'd enjoy it.

"We know, we know." Shouta muttered. "See ya Matsumoto. Old man. Clown face." And with that, both Shouta and Hitsugaya stepped through the Senkaimon before either the Head Captain or Kurotsuchi could yell at Shouta for his use of rude nicknames.

I know I didn't give anything about their mission, but right now I'm still working on the details. So I made it all dramatic and mysterious. Also, if you want a clue about Shouta's past etc. go to Fictionpress, and search for With These Wax Wings I'll Fly by Shouta Izukai. The mission details will be revealed soon enough. :)