NOTES:

Cross-posted from Ao3 under the name Arlerted

There are a few things that you should know or be warned about before reading:

- In this story Rin and Yukio's hair are the same color: black
You can see my reasoning at this tumblr post post/157725662722/about-rin-and-yukios-haircolor

- I try to keep the way characters addressed each other (Like how Shima calls Rin "Okumura-kun" or refer to Yukio as "Wakasensei" while calling Konekomaru "Koneko-san") because I think it is a nice and important features that shows their relationship with each others (How close they are, etc.)
If you don't really get it, don't hesitate to ask, I might be able to give a (shaddy) flash course of Japanese addressing system (to my knowledge)- also I'm sorry if I get any of it wrong.

- Possible OOC-ness

- I'm not very good at description so this is mostly conversation-centric, also, English is not my first language, if you find any mistake I'll fix it faster than lightning!

- I'm not really sure where this story is within the manga timelines, sometime after Kyoto arc since they already accepted Rin as son of satan and before Shima's you-know-what arc (no spoiler!)

- I have a certain fondness toward ShimaxRin/ShimaxYukio so... there might be a teeny tiny leak. But don't worry! Nothing is intended to be romance in this fic!

- This is a part of series where I will put random Rin - Yukio brotherly fluff stuff, feel free to drop a prompt or request, I'll be happy to try and write it.

- Reviews, comments, even flames are welcomed. Enjoy.

FRATERNAL TWINS ARE TWINS TOO!

"Hey, Okumura-kun." Shima put his pen down and rested his chin on the edge of the table. He stared at the mount of papers and reference books in front of him.

"Hmm?" Rin answered with a hum. Right now he is too distracted with notes that Yukio gave him last week to pay much attention to Shima.

"Is it true that you and wakasensei are twins?" Shima sat up straight, staring at him.

"Huh?" This time not only Rin but Suguro and Konekomaru all directed their attention to Shima.

"I-I mean, yeah, of course we know since long ago that you are twins, but—" Shima shrug because they all are staring at him.

"Are you that bored, Shima?" Suguro rolled his eyes. He knew Shima is seeking distraction from these assignments.

"Yeah, these are not going to finish themselves, Shima-san." Konekomaru added before going back to his own answer sheet. They know that Shima can't sit still for more than five minutes without letting out complains. Especially when they are stuck to doing school chores like this.

"Of course we are!" Rin scowled and slammed his pen to the table.

"Not you too, Okumura." Suguro sighed as he picked up a few loose notes that got knocked to the floor by Rin.

Shima smiled because Rin takes his bait. Now they can talk and forget about all this for a moment, "For starters, you look nothing like him! Wakasensei looked more… mature. Not to mention he is tall! Waaaaay cooler than you." That smile turned into a smirk because teasing Rin is… well, fun!

"What?! That because Yukio and I are naternal twins!"

"Fraternal." Suguro corrected. He glanced at Konekomaru which also put down his pen to look at the arguing boys.

"Now that you mention it, none of your traits are similar as well. Fraternal or identical, twins usually still share something in common." Konekomaru jumped into the conversation, he is getting tired as well to be honest. They've been here for almost four hours and haven't even tackled half of the assignments.

"Of course I don't! I'm not a scaredy-cat or crybaby like that four eyes!" Rin crossed his arms, "Also, if you pay attention, our face are similar!"

Shima stared at him. Konekomaru stared at him. Even Suguro finally gave up and stared at him.

"Well?"

"Nu'uh." "I don't see it." "Sensei don't have that kind of stupid expression on his face." Shima and Konekomaru nodded to the last comment made by Suguro.

"Arrghh." Rin ruffled his own hair in frustration, he stood up, "Wait here!" He got out from the dining room where they are sitting and runs to the room he shared with Yukio.

Rin rummaged through his drawer. It's full of random knick knacks, snacks, and candies. The other drawer contained failed test sheets with which he hides from Yukio. His third drawer contained some loose note. "Where is it…"

He moved to Yukio's table beside him, noticing a note on top of it that said, "I will be back by dinner. – Yukio". Rin rolled his eyes and mutters something about Yukio being too busy then opening the first drawer. There are small bottles and packages of various liquids, herbs, some gun cleaning kit. Nope.

Second drawer: official looking maps with Yukio's name and 'Class Test and Materials' written on it. "Oooh, what do we have here…" Rin opens the map. He was hoping to find some answer for Yukio's assignment. What he find is another note: "I will know if you look at the content of this map, Nii-san. And I will double—no triple your assignments for the next months." Rin felt a shiver down his spine and slammed the drawer shut.

Third drawer: Glasses. Lots of glasses. Nope. That's Yukio's stash.

Fourth drawer: Random small items that didn't belong in any of the drawer. Rin spotted what he is looking for, grabbed it, and dashed out back to the dining room.

"Here, look at this!" He slammed a photograph of Yukio and himself. They were wearing what looks like a kindergarten uniform.

"Oh, wakasensei looks so cute." Shima chirped.

"It's hard to imagine that he was also a child once." Konekomaru stared at Yukio at that picture.

"That is ridiculous, of course he is." Suguro also gave a comment, looking at Yukio, then Rin. One thing that he noticed is that Rin's ears at that photograph are normal, not small and pointy. That is kinda sad.

"Look..." Rin pointed at himself, wide smile with a peace sign, then to Yukio's glasses wearing face. "We look the same, right? Aside from hair style and his stupid glasses!"

"I suppose, yes." Shima finally admitted, Suguro and Konekomaru nodding in agreement. Rin looked satisfied, of course he is, and Yukio is his twin brother after all. It's only natural that he wanted them to acknowledge it.

"But only in this picture. The current you and wakasensei are still nothing alike."

"Oh yeah? We'll see! Come here again tomorrow at lunch and I'll show you something!" Rin pointed at Shima, "Bring Shiemi and Izumo too, we all can have lunch here!" He smirked, gathering his papers, "I gotta go now!"

"What about our homework?" Suguro protested.

"You can do it here if you want! Yukio won't be here till dinner and you can ask Kuro where the bathroom is if you wanna go!" Rin is heading out, struggling to carry all his stuff.

"But we have to finish this today, Okumura-kun!" As much as Shima hate this assignment, he still got the sense of responsibility.

"I'll drag Yukio—here to help us with that tomorrow if you want! Bye!" He stopped in the middle of his sentence, almost like he's trying to stifle a laugh.

"I can't believe that idiot, leaving us here by ourselves…" Suguro returned his focus to the paper in front of him. If Rin can ask Yukio to do that, it will be a serious help for them, but of course he didn't want to bother his teacher like that.

"This is your fault, Shima-san." Konekomaru sighed and looked at Shima.

"Can't deny that!" Shima scratched his head, "But don't you think something interesting is going to happen? After all we've had nothing but homework these days, a little fun can't hurt anyone." He stretched his arm and yawned, "I'm done for todaaaay."

The Kyoto Trio ended up being there for two more hours until Suguro finally gave up. Shima fell asleep on his seat long ago. Konekomaru tried to wake him up but Shima won't budge. At the end Suguro decided to leave him there and go back to their own dorm.

Thanks for reading!

Chapter 2 will be posted soon!