Edited version: I'm sorry, I realised that my concept of time was greatly flawed. I intended on making this a short series; instead I opted to start when Harry and the others were fourteen! So yes, I apologise. The time has now been changed to when Harry and everybody else are seventeen, but Yusuke and Kuwabara are still fifteen.

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I'm really sorry; I couldn't refrain from the temptation of writing one of these crossovers! I know people hate them, especially when they're clichéd things like 'We're sending you to protect the Golden Trio!' and whatever, but…erm, yeah. I couldn't help myself.

This takes place after the Dark Tournament, and in the Deathly Hallows.

Disclaimer: I don't own Yuu Yuu Hakusho or Harry Potter in any way, shape or form.

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"Why do we always get stuck with these weird ass assignments?" Yusuke sighed, staring at the small pile of envelopes in front of him. Completing the circle were Kurama, Hiei and Kuwabara, their gazes also riveted on the paper. The envelopes themselves were a slight faded yellow, but cursive, inky green writing adorned the front. Koenma had communicated with the Spirit Detectives earlier that day, indicating that they would have a mission soon, and that he refused to tell them more than that. This was presumably it. Kurama reached out, plucking the one addressed to him and starting to open it.

"I guess we'd better see what our mission is, first," he stated calmly, ripping the v-shaped part open and taking a fragile letter out. Everybody else crowded around him, eager to see the contents.

Dear Shuichi Minamino, Kurama translated into Japanese.

We are pleased to inform you that you have been accepted to Hogwarts School of Witchcraft and Wizardry.

"WHAT?!" At this point, Yusuke grabbed for Kurama's letter, just as Kuwabara snatched onto the other side and yanked. With a loud ripping sound, the letter tore into three parts, Yusuke, Kuwabara and Kurama each holding a third. Hiei folded his arms and leaned back, giving the other three a pointedly disgusted look while Yusuke and Kuwabara bickered.

"I did not tear that letter! You did it! I just wanted a better look at it!" raged Kuwabara, waving his piece of paper around emphatically.

"Say what?! You idiot, you did it! And I wanted to see it too!" Yusuke yelled back, pointing an angry index finger at Kuwabara, while Kurama just sat in between, eyes closed. His piece of paper hung limply from his grasp, before he placed it on the floor.

"Like hell you did! You can't even read English!" Kuwabara shouted back, still vigorously jabbing his paper everywhere.

"Like you can?" retorted Yusuke, a fist raised, and his Reiki flaring.

"We have another three letters, guys, and they're probably all the same. No need to get so worked up," Kurama soothed, trying to calm the two irate boys down. It worked; the other two pounced on their own letters and with a quick glance at an indifferent Hiei, Kurama picked up the last letter, addressed to a Mr Hiei Jaganshi. Quickly, his emerald eyes scanned the message, and when he finished reading he tossed the paper over to Hiei. With a flick of his wrist, the fire demon caught it neatly and finished reading it in a flash.

"Oi, Urameshi, what's this word?" Kuwabara asked, blinking and pointing to 'pleased'.

"How am I supposed to know? I flunked English, remember?" snapped Yusuke sullenly, sounding like a child who had just been deprived of candy. In order to avoid another fight, Kurama intervened.

"All it says is that we've been accepted to a school that studies magic. And this school is overseas, in London." Yusuke and Kuwabara blinked simultaneously, and Kurama understood.

"In Britain." Blink blink.

"…very far away from here." Kurama finished, and the other two broke into stupid grins. "So I take it you two flunked geography, as well…" Ignoring the fox demon, Yusuke asked, "So why are we going to this school?"

"Well, this is apparently a school for witches and wizards-" the redhead started, before getting abruptly cut off.

"Whoa! There're witches and wizards?" Yusuke wondered, leaning back on his two hands and looking upwards wondrously. Kuwabara, on the other hand, looked frightened. He clutched his hands on his chest, and asked in worried tones, "But what if they curse us? What if they jinx us? What if they curse us AND jinx us?! What happens if I get permanently deformed?! Yukina won't like me anymore!"

"Shut up, Kuwabara." Yusuke cut through his worries and fantasies about the pretty ice maiden. "Why are we going? We're not even wizards. We're just super awesome demons and humans."

"Because this is a special mission, Yusuke." A different male voice sounded, before a slender, bubblegum-haired girl bounced into the room, smiling broadly. She was outfitted in a pink kimono, and had in her right hand an oar. Kuwabara looked puzzled.

"What? Botan? I could've sworn that was Koenma speaking just then…" he frowned, rapping his skull lightly with a hand. A short toddler with messy brown hair peered out from behind the Grim Reaper, looking irate.

"Hn; that's because it was Koenma, idiot." Hiei spoke up for the first time, voice dripping with sarcasm as he addressed Kuwabara. Koenma glanced at Hiei briefly, nodding a silent thank-you. Hiei ignored him.

"You again, binky breath?" Yusuke rolled his eyes. "When will we ever get a break? Or at least get a chance to blow up demons in our own time?"

"Shut up, Yusuke. While you work for me as Spirit Detectives, I get to call on you whenever I want," Koenma snapped. "Right, well, Botan, would you like to fill them in on the details of this mission?"

"Yes sir!" Botan smiled at all the boys, taking a seat on a couch nearby. "Basically, this school is in a little bit of trouble. And so is Reikai. There's a guy called Voldemort, and he's really, really strong. Stronger than the Toguro brothers at their hundred percent. Yeah," she nodded, catching sight of Yusuke and Kuwabara's incredulous looks. "He's just been...well, bought back to life in a solid form again, I guess, would be one way of putting it." Yusuke whistled.

"Wow, so this guy knows the secret to immortality? Neeeat." He sighed wistfully.

"This type of immortality isn't good, Yusuke. In order to obtain it, you have to kill people. The more people you kill, the more ripped your soul becomes. You can store those fragments of your soul in objects, so when your body is killed, you're still technically 'alive' because you have pieces of your soul floating around," Botan explained. Yusuke's look of wonder slipped into a mask of anger, and he sat up straighter.

"So what you're saying is this guy has killed people just to become immortal?!" his voice rose in rage. Botan nodded glumly.

"Yes. To cut a long story short, his physical body was 'killed'," she made little quotation marks with her fingers, "about sixteen years ago, maybe seventeen. Around about then, anyway. He got his body back a couple of years ago."

"And how does this link to Reikai?" asked Kurama curiously, remember her previous statement. "Usually we leave the magical world alone, don't we?" Yusuke and Kuwabara looked at him.

"You knew there were things like witches and wizards?!" they both yelled. Kurama nodded, once. "Naturally."

"Why didn't you tell us?" yelped Kuwabara.

"Well, you never asked," Kurama replied, a small smile playing on his lips as he gazed at Yusuke. Koenma coughed loudly, indicating he wanted to get this over and done with as quickly as possible.

"Well, yes, generally we do leave the magical world alone," Botan continued from where she had left off. "But this is an unusual circumstance. He's been trying to recruit demons now. He started with the D and C classes, and he had quite a bit of success with them, which was when we started getting worried. We know he's tried with the B classes, and our spies tell us he's been talking with the A classes too. What Enma's worried about is if he tries, and successfully, recruits a lot of A and S class demons. Then we would have a big problem on our hands. Do you understand?" Botan elucidated.

"So what's our role? Why don't we just go after this Vollumort-"

"Voldemort," Botan interjected.

"Voldemgortt-"

"Look, it's not that hard. Vol-de-mort!" Botan enunciated clearly.

"-dude ourselves and kill him?" Yusuke asked, ignoring Botan the second time around.

"It's not that easy. Nobody knows where he hides, except his closest followers. But we have information that a group of three kids from this school you're going to, Hogwarts, will eventually cross paths with him. Their names are Harry Potter, Ronald Weasley and Hermione Granger. We want you to befriend these kids, and accompany them to kill Voldemort." Botan met Yusuke's smirk defiantly, and she narrowed her eyes. "Yes, I went to a soothsayer, what's your problem?"

"Nothiiiiiiiing…" Yusuke dragged the last syllable out. "Was it about, perchance…" He walked up to Botan, and leant forward to whisper a few words in her ear. She flushed deeply, looking like a deer caught in the headlights.

"Yes!" Yusuke punched upwards into the air, before he turned and skipped back to meet a grumpy faced Kuwabara. The latter was rummaging around in his pocket reluctantly, before slapping some notes onto Yusuke's outstretched palm.

"Nice doing business with you." Yusuke let out a soft laugh, counting the notes before stuffing them away in his own pocket. "We had a bet that Botan-" Yusuke tried to explain to everybody else, but couldn't get any further as Botan hit him over the head repeatedly with the oar, her face screwed up in a mixture of humiliation and anger.

"I don't know how you figured it out, but no one else is to know!" she screeched. She only stopped when Yusuke collapsed onto the floor, and the angry girl flicked some hair and strode outside the house in a huff. Everybody else quickly followed her, Yusuke having made a miraculous recovery, and watched her board her oar.

"I'm going back to Reikai, sir," she snapped at Koenma, before flying off like two S class demons were on her tail. Koenma stared, dumbstruck for a moment, before running after her and shouting for her to stop. A little while later, he stopped waving his hands around and turned to glare at Yusuke, exhausted.

"Are you happy you've made her go away and leave me stranded now?!" he screamed at Yusuke.

"…well, you know what? Yeah, I am," Yusuke replied carelessly, before striding back into the house. "By the way, she has the hots for you, Koenma!" he added as a side note, letting his team mates enter before slamming the door closed and leaving Koenma by himself outside.

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So, yay or nay? Should I continue this or was it absolutely horrible, and there are thousands more stories like this out there on the face of the world and that this one deserves to burn and die? Feedback would be helpful. Criticism (to a point) would also be helpful. Review if you'd like, but if you don't want to I can't exactly force you to. Thank you for reading:D