This arc took the longest to write.

Still do not own Assassination Classroom or Harry Potter

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Harry woke up in a hospital room. He blinked up at the ceiling, feeling better already.

"You did a pretty stupid thing, you know?"
Harry turned to see Irena there in the chair by his bed.

"Irena-sensei?" Harry was the only one in their class that didn't call her 'Bitch-sensei.'

Irena smiled at him warmly,

"We've all been taking turned watching you. You surprised us; you know? Going up against Takaoka bare fisted. That was so stupid."
"You think so?" Harry chuckled.

Irena sent him a glare,

"Don't just say that and laugh…Your injuries weren't as bad as we though. Mostly just bruises…and one broken rib. Most people wouldn't get out of a fight with Takaoka with just that." Irene's expression softened again, "You just keep surprising us, kid."
"That so?" Harry whispered, he lay back into his bed, "Irene-sensei…could you teach me something?"
"Teach you something?" Irena asked him.

Harry nodded,

"Well…I was just thinking…when you were playing the piano, Karasuma-sensei said that assassins learn a variety of skillsets to help them. I…I'm probably going to be off of gym practice until my rib heals…so then…"
Irena let out a sigh,

"I don't know…"

"Is two hundred thousand yen a week okay?"

"How about I teach you music?" Irena said cheerily.

Too easy, Harry thought with a dry smile.

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Irena was actually a really good teacher when she put her mind to it, and when she was motivated enough. She taught him during gym class and after school.

She had opted to give him a hard-core training course in the piano only…all of her instructions were in Russian, her mother tongue.

She tossed him a Russian to English dictionary and refused to say anything that wasn't in her mother tongue.

It was a double lesson.

Harry had to look up what she said several times during lessons. He bought some books on the subject and, after a while of figuring out sentence structures and small words, he only had to look up the bigger words she was saying. The new and unfamiliar stuff.

And Irena used a lot of different words when it became apparent that he was starting to understand her. His piano was coming along as well and, after a week or so, Harry had started answering back to Irena in Russian.

Koro-sensei watched them every now and then, apparently curious as to what they were doing.

Harry's piano playing was coming along quite well. By the end of the month he could already play some of the more complicated pieces in the book Irena had gotten him.

His ribs had healed up by then, but Harry decided to keep going and Irena…well, she didn't say no to the extra cash. So, they practiced after lessons.

Horibe Itona started coming to classes regularly after Koro-sensei got rid of his tentacles. He was now a permanent fixture in their class and seemed to be quickly accepted.

In October, Harry remembered that Irene's birthday was coming up and decided to get something for her. She'd been his tutor after all, and she'd gone above and beyond to actually make him good at not just music but Russian too.

But what would she want anyways?

His eyes fell on a locket in one of the jewelry stores. It had a pretty ruby in it with a crescent moon design around it.

If that wasn't suitable…The price wasn't that bad either.

"May I buy this?" Harry asked.

He knew that Irena had tons of jewelry, but Harry…he could give her something a little more unique. He had a plan.
He'd seen Hermione do something like this before…enchanting objects.

What sort of enchantment should he put on it?

"Irena-sensei?" Harry poked his head into the teacher's lounge.
She wasn't there.

"Shitereshimasu." Harry entered the room and bowed.

"Potter-kun?" Karasuma looked up at him.

"Um, sorry to bother you," Harry said, "but have you seen Irena-sensei?"
"She hasn't come in yet." Karasuma said.

"Oh." Harry said, taking a box out of his bag, "I have a birthday present for her…She went above and beyond with the tutoring, so I thought she'd like something like this." He made his way over to her desk, "Could I just set it down here?"
"Sure." Karasuma grunted, obviously entranced in his own work.

Harry set it on Irena's desk, then walked out of the room and returned to his classroom.

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Harry was happy to see Irena waring the necklace he'd gotten her during their English class. The day passed and it seemed that the rest of the class had forgotten about Irena's birthday. The next day, she came to class looking kind of glum.

"Irena-sensei?" Harry caught her in the hall, "Is something wrong?"
"No…" Irena said.

Harry tilted his head to the side,

"Oh. You seem upset."
Irena sighed,

"Yeah…It's nothing though, just one of those days, I suppose."
Harry looked uncertain,

"Well, if you're sure." He wanted to help her, really, he did. But it looked like this was something she needed to work out for herself.

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Irena's melancholy didn't seem to go away as the days passed. In fact, it seemed to get worse. After four days, she was looking exhausted.

Harry was getting worried.

"Nee…it's Bitch-sensei's birthday, isn't it?" Kataoka spoke.

"That's why she's so down, right?" Kanzaki realized.

"That was four days ago though." Harry remembered.

"Yeah, but…she seems upset." Kataoka said, then put her hands on her hips, "And I'm pretty sure she wanted something from Karasuma-sensei."
"Eh~" Fuwa said mischievously.

It was apparent to anyone that Irena had feelings for Karasuma.

Was he really that oblivious though? Harry wondered. He knew Irena was a very beautiful woman. He actually felt a bit nervous around her. Not because she was an assassin either (although he thought it was that at first).

"I say," Kataoka said in a conspiratorial voice, "We all chip in some money to buy Bitch-sensei a present."
Where had that idea been on her actual birthday?

"Alright." Harry decided, "I have a bit of cash on me."

He pulled out some bills from his wallet and dished out two hundred yen (about twenty pounds).

Some of the other students started putting in some money as well. They looked over their haul.

About seven hundred yen.

After classes, the students all split up into groups. The girls went off to separate Karasuma and Irena. A group of them went off to talk to Karasuma and Harry was grouped with the present-finding committee.

"Is this really enough for an adult woman?" Nagisa wondered worriedly, looking down at the money.

"It is kind of tough." Sugino agreed, "What do you get someone who already seems to have two of everything?"

"You get her something from the heart." Harry answered.
They all turned to him and he found himself redden a bit,

"Well, eto…how do I put it…the last time I bought a present for someone, I…kind of put effort into it. I mean, I made it."
Well, he'd made the enchantments anyways.

"It's her birthday, right? Why don't we make her a cake? We could use the home ec. Room." Harry suggested.

"That's not a bad idea." Kaede agreed.

"We'll probably have some left over though." Sugino said, "I mean…cake ingredients are kind of cheep…"

"I knew it…" A voice said behind them, "Hey, it's you guys."
They all turned to look at the florist selling flowers out of his van.

"Did everything turn out well with that old man?" He asked them concernedly, "The one who injured his leg?"

"Ah! The guy who called the ambulance for help." Nagisa recognised him, "Thank goodness, he managed to forgive us in the end."
Harry had heard about that, but he hadn't been there, since he'd been healing from his injuries still.

"Ah. I'm so glad it wasn't anything serious." He said with a smile, "And now," He raised his finger in the air, "You'd like to find a present, right? Something for a grown up?"
"Y-yes." Kanzaki agreed.

"How about something like this?" he picked out a flower and handed it to her.

"I get it! A bouquet!" Kaede said excitedly.

They all seemed to agree with the idea. It would go well with the cake.

They purchased the flowers. One group returned to the school with them, while the other half went off to buy the ingredients for cake.

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Once Harry was at the school, he started heating up the oven and started on the cake. He started mixing the wet ingredients, then moved on to the dry ingredients.

"Eh~" Kaede watched him work, "I didn't know you could cook, Harry-kun."

"Of course, I can." Harry looked over at her in surprised, "Well, I mean, I live on my own, so I have to know. When I was living with my aunt, she taught me how to cook and bake and maintain a house. She was a horrible woman…but I learned a lot from her."
"Eh? Horrible?" Kanzaki wondered.

"She hated my mother, and…after my mum died, that grudge was transferred to me. I did all the house work when I was living with them. It…wasn't a good place to live." Harry looked off to the side.
He didn't really like talking about this…he was surprised at himself for bringing it up at all.

Harry put the cake in the oven and put the timer on.

"There. Once it's done, we can frost it."
"Can I help with anything?" Kanzaki asked him.

"Yeah. We want to do something too." Nagisa said.

Harry smiled at them,

"Alright then. One of you can wash these dishes, and Kaede-chan, could you take out the icing sugar, butter and cocoa powder? Oh, and the vanilla too."
"Got it." Kaede nodded, moving to get the ingredients.

This was Dudley's favourite desert, Harry recalled absently. He'd cut down on the sugar a bit, since he preferred it a little less sweet.

"Bitch-sensei!"
"Bitch-sensei, please wait!" Cries came from down the hall.

"Eh? What's going on?" Harry wondered, looking up from the icing Nagisa was stirring.

Kaede opened the door just in time to see Irena walking off down the hall. She looked…cold, Harry thought.

It was worrying. Something in Harry told him to go after her.

"Nagisa-kun, if the icing is too runny, add more icing sugar, and if it's too thick add in a bit of milk, okay?"
"Eh? Ah, wait, Harry-kun!"

Nagisa was uncertain as he continued to stir the ingredients together.

"You can do it." Harry gave him an encouraging smile before running off after Irena once again.

She hadn't passed too long ago…He heard the slamming of the door and quickly pursued her. She stormed off to the parking lot and Harry finally caught up with her.

"Irena-sensei!" Harry called, causing her to turn her head, "What happened?" He asked her worriedly, "You looked…not good."
Irena looked down at her car window,

"I'm thinking…it's about time I move on."
"Eh?" Harry wondered, "Why? Is this…does this have something to do with your birthday?" He asked her worriedly.

"No." Irena said, "I'm not going to sulk over something like that."
"Then wha – Ah!" Harry felt a sharp pain in the back of his neck. His eyes closed and the world went black. It was all so sudden. He hardly had the chance to think.