Okay, this is a short story… :) and it will be only couple chapters, maybe more, but I originally plan this to be less than five chapters anyways. Well, this story is out of nowhere actually, the idea of Hitsugaya and Karin pull a prank on each other is kinda hard to miss :P

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It was very late. But Karin was very hungry and hunger knew no hours. Slowly, she made her way down to the 10th squad office for midnight snack. Weird? Oh, not at all. She was Toushiro and Matsumotos' friend since she joined the Shinigami Academy and she had been here many times. Matsumoto told her that she had hidden snacks and sake in the 10th squad office, without anyone noticing it, not even the 10th squad captain, Toushiro Hitsugaya. She had done this plenty of times before and had never encountered any trouble, but tonight she was distracted. Perhaps she was nervous about the long and difficult kidos exams that she had to revise. Maybe she was exceptionally tired.

Well, whatever the reason was, Karin wasn't paying attention and thus, as she turned the corner, she walked straight into several stacks of 10th squad paperwork. The first stack wobbled dangerously and fell into the next one, which toppled into the third, which tipped into the forth and so on and so forth.

"Damn it, Rangiku-chan must have put them here." Karin sighed and looked at the mess that she had just created.

At the moment she hoped no one knew what she did here. The entire population of Shinigami Academy would have made fun of her if they knew this. And she knew Toushiro would have had her head if he found out. So she turned and walked away trying to be very quiet. Unfortunately, there wasn't enough light and she bumped into someone.

"Kurosaki," Toushiro growled. He knew it was Karin. He could sense her reiatsu, even though he wasn't able to see her. "Was that you?"

"Was what me?" Karin shot back immediately forgetting that it would be easier to get away from the trouble if she just kept quiet.

"What happen to my paperwork?" Toushiro asked shocked as soon as his eyes adjusted to the darkness, and he saw what happened to his paperwork on the floor.

"Oh that," Karin replied.

"Yes that," Toushiro snapped. He was easily annoyed after all. "Was that you?"

"No," Karin answered coolly. "That was you."

And before Toushiro could shot her a confused look, Karin spun around and took off at a run.

"Kurosaki!"

Karin was running and laughing at the same time. That was bad and she knew he would make her pay for that later, but it had been hilarious while it lasted. Toushiro wouldn't be able to extract himself from stacks of paperwork, and he would be spending the night trying to reorganize everything in his office. She just knew he would be in so much trouble tonight, and she couldn't wait to see his face in the next morning.

Toushiro, on the other hand, was furious. He had just got back from his mission and couldn't find his lieutenant anywhere, so he came to his office hoping that maybe he could find Matsumoto sleeping on the sofa or something. And Karin just made him do extra paperwork. He hardly got his paperwork done each day because Matsumoto kept ditching her work and now everything got worse. Damn, Karin was a trouble maker but he would make her pay for this. All he needed was to think up a suitable revenge.

...

Karin wasn't really worried about what Toushiro would do but she probably should be because in Toushiro's opinion, Karin should be worried. He had a plan, and it was a very good plan indeed. It had taken him to research to find the perfect kido, and he had finally found it after spending time in the central library. This kido allowed him to temporary block the path of a person. Well, it would last from 10 to 20 minutes and could only be lift by him whenever he wanted to. He just hoped that Karin would be late to all her class at the Shinigami Academy and got into trouble of doing extra homework, just like him.

Toushiro woke up early on the day he had picked to carry out his plan. He went to the academy while there were only a few people there. He saw Karin enter the academy with her friends and he figured out that he only had about half an hour before Karin had to go to her class and he had to go back to his office. Sinking backwards into shadows to make sure she didn't see him, he muttered the kido and stood back to watch his work.

For a moment Karin continued on normally but then she got to the first doorway on the way to her sword class. The friend that she was talking with continued on walking through the door. Karin, however, bounced back. She looked baffled for a moment while trying to examine the door, but then she shook her head. She seemed to think that she must have accidentally hit the door frame or something, so she tried again, and again she was unable to go through. By that point, her friend had noticed that Karin was no longer with her and had turned back to see what was holding Karin up.

"What are you doing? Hurry up!"

"Ruka!" Karin cried exasperatedly. "I can't get through the door!"

"What do you mean?" Ruka asked looking confused.

"I don't know," Karin explained trying to demonstrate how the unseen wall blocked her. "It's like there 's an invisible barrier or something."

"That's strange," Ruka said, furrowing her eyebrows. "Try again, Karin."

Karin backed up several steps and then tried to run towards the door as fast as she could. In retrospect, she realized this was a foolish idea as she hit the barrier with a great amount of force and was flung backwards with an equal amount of force. She hit the ground, landed on her butt, and skidded backwards a few feet.

Passerby paused to watch her as she rose gingerly to her feet, then they chuckled as they continued through the door way that was so stubbornly refusing to let her past.

Finally, after a few more attempts, Karin shrugged in defeat and told Ruka to stop waiting for her and go to class, while she would stay and try to figure out how to get there. Toushiro chuckled as he watched Karin trying to use some kidos to get past. He also watched her trying to use some alternate routes, but each of these was blocked as well. When Karin finally gave up all hope and sat, leaning against the barrier. Toushiro smirked as he knew his plan succeeded and he set of for his office. He would be back as soon as she finished her class.

Approximately fifteen minutes after Karin had first encountered her invisible obstruction, the barrier dissolved and she had been leaning on it, so she fell to the floor once more. Surprised but relieved, Karin gathered up her things and rushed off to her sword class, dreading whatever punishment was in store for being late.

"You are late, Miss Kurosaki." Her sensei said. "Please take a seat and watch the demonstration. And don't forget to write me a report of what you have learned today."

Unfortunately for Karin, Toushiro was waiting for her outside the sword class to secretly recast the kido. Well, he actually waited outside every one of her classes. And Karin, of course, ended up being late to every class and by the time she was on her way to the 5th squad to visit Ichigo, she was on the verge of tears. This was the first time that she felt like she wanted to cry, because she really felt frustrated and confused. None of her sensei believed that she couldn't help being late and that she didn't know why she couldn't get through any stupid doors. So by the end of the day, she ended up with extra homework from every class. In addition to that, she had to write an essay on the history of the 3rd squad, which meant that she had to go to the 3rd squad and met her father. Oh, this was bound to be unbearable.

"So, Kurosaki, How are you today?" Toushiro asked as he stepped in front of her.

"It was okay," Karin sighed trying not to think about extra homework that she had to do.

"I see."

"Wait, why do you ask me?" Karin asked looking at Toushiro suspiciously. Well, it wasn't like him. He had never asked her that kind of question before, and then it hit her. "It was you!"

"Of course, it was me," Toushiro nodded. "You got in lots of trouble, I hope?"

"Toushiro!" Karin growled. "You will have to pay for this."

"Ah, sweet revenge."

"It will be so sweet when it's my revenge," Karin snapped and narrowed her eyes. "You do realize this means war, don't you?"

"We will see about that." Toushiro smirked and walked away.

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So, this is the first chapter. Please review, I hope you like it.