Okumura Yukio, outstanding academic achievement, two mesiter at the young age of fifteen, so on and so on. He is perfect… most of the time, that is. Not this time though. It's time for Rin to teach his little brother a lesson.

Shout out to Kirychan1226, a nice reader whose request is responsible for this chapter! Leave a comment if you got anything in mind and I'll try to write something out of it.

This is part of one-shot series containing Okumura Twin's general 'brother' fluff (can be found on my profile)

How can you be so smart yet so dumb at the same time?

"What?" Yukio looked uncharacteristically dumbfounded, frowning.

"Ukobach won't be cooking at your dorm for a week. His service is required at a field training camp starting tomorrow." Mephisto repeated each word slowly, as if talking to a child. "But I believe your brother is more than qualified to cook for both of you, Okumura-sensei."

"But—" Yukio rarely complained or denied the principal, no matter how—clowly and ridiculous he is still a superior to Yukio.

"No buts! Besides you can eat at the cafeteria if cooking is not possible, we served first class food on par with a three michelin star restaurants! You are what you eat and everything in this school must be the best in every aspect!"

Beep! Beep! A small alarm in the shape of a pink haired anime character rang. Mephisto reached for his cup ramen, taking off the lid and stir it.

Yukio tried to ignore the irony and nodded, "I understand. Thank you." With that Yukio bowed before he left the room.

"What am I supposed to do now…" He muttered to himself. His keys jingles as he took it from his pocket, trying to find the one that connects to his dorm. When he stepped out, it's right on the entrance. Quiet. No sound of his brother fooling around with giant Kuro or sound of pan and spatulas clanging against each other as their chef cooked dinner. Yukio unbuttoned his collar and loosened his tie, he's done for today.

"Nii-san. I'm home." He said quietly as he entered their shared room.

"Uh-huh." Rin was hunched over his desk, pen in hand, various papers with equations scribbled on it scattered on it. On the floor was Kuro, playing with balls of crumpled paper in silence.

"What are you studying now?" Yukio took of his exorcist overcoat and hang it.

"Math." Rin's answer are short, Yukio can see how hard he tried to focus.

"Want me to help?" Yukio stood behind Rin, trying to see what chapter his older brother is working on. Integrals. 'Ah, that's one of the hardest for Nii-san.' He ran a quick check for errors, nodding in acknowledgement seeing that at least seven out of ten answer is correct.

"Nah. I need to try by myself first. It's not like I'm gonna need this to defeat Satan, why do they make me attend high school as well... " Rin groaned in frustration as he turned his scratching paper to another ball of and threw it to the basket. "I wonder what Ukobach cooks for dinner." His mind wandered to food for a second before he shook his head and slapped his cheek a few times. "Focus, focus." Rin muttered to himself.

Yukio decided to leave him alone. It's the midterm season for True Cross Academy. Despite being there just to be an exorcist, Rin still have to attend the 'normal' school as well, not just the cram school. His brother is having enough on his plate trying to keep up and prepare for the exorcist exam. He never really study for the regular school, so this is hell for Rin.

Eating breakfast at the dorm and eating homemade bento for lunch he managed to knock some zeros from their monthly expenses, but Rin spent most of his time studying this week. He will get in trouble if he failed the classes, at least that was what Mephisto told him. The reason Yukio was worried about Ukobach's absence was this. Rin barely sleep with all the studying, cooking for every meal will just be another burden.

"Good luck, Nii-san. I'll see what's on the kitchen."

Yukio went to the kitchen, opening the fridge to examine what ingredients they've got. Honestly, his cooking skill only came from 7th grade optional Home Economics lesson. He dropped it on 8th grade and took science instead. Here in True Cross Academy he's on special advancement class focusing on science. So, yeah.

Their fridge is empty, since Ukobach usually received new ingredients every day. Only a package of egg and assorted veggies. That will do. He'll make some omelet. Yukio rolled his sleeve and started 'cooking'.

30 minutes later…

Rin's stomach let out a low grumbling noise that startled Kuro.

Rin, you should eat!

"Ngghh… I'm not finished…" Rin scratched his head with the back of his pencil, then slumped down to the table. "I'll just ask Yukio for this last one…"

Yeah! Where is Yukio?

"Huh? You're right. He's been gone for ages…" Rin glanced at the clock. Checking the kitchen shouldn't take that long. "Maybe he's been summoned." This wasn't the first time Yukio disappear at night, sometimes only to come back with bruises on his bodies, emergencies, he said. Rin scolded him countless time for that, Yukio is such a workaholic.

Rin got up, twisting his body to the sides a few times until he heard the satisfying 'crack!' from his sore joints. "I'll check on him, Kuro, you can go back to sleep."

Kuro yawned and gave a little nod, jumping to the table and curled there.

Rin walked to the dining hall, it was dark, only the lights over kitchen area was lit up. Rin narrowed his eyes when he saw Yukio fumbling in the kitchen. He tip toed to the kitchen area, crouching behind the half-wall that divide the seating and kitchen area, trying to peek.

"Is he—Wow." Rin took out his phone, quickly turning on the camera and pointed it at Yukio's direction.

'CLICK!'

"Who's there?!"

"Stupid phone ruined the image…" Rin groaned, but he checked the result anyway, "Oh. I take that back."

"What are you doing, Nii-san?!" Yukio's face turned into a shade of red in realization, he grabbed Rin's hand to look at the phone.

"Pfftt, you look stupid!" Rin let his brother looked at the picture. "What are you doing anyway? You're cooking? Where's Ukobach?" Rin pulled his phone away from Yukio's reaching hand and slipped it to his pocket. "No. You're not deleting this picture. I'm gonna show it to Shiemi."

Yukio sighed in defeat, "Ukobach is gone for a week-long mission… I'm… trying to make something for us. But… you are supposed to make food when you're cooking… not… whatever this abomination is." He pointed at a plate with dark brown matter on it. "I'm trying to make another one…" He pointed at the cutting board.

Rin walked into the kitchen, stopping beside Yukio. "What's this?" Rin held Yukio's hand to look at it, "You cut yourself?" He examined the fresh band-aid on Yukio's index finger.

"Um… Yes." Yukio forgot that his brother tend to overreact when he got hurt. "It's just a small cut, don't worry."

Rin looked at him for a moment, then shrugged, "I've seen people sliced the tip of their fingers off on first attempt to 'cook like a pro'. What are you making?"

"Omelet…"

Rin observed the dark brown matter, "Let's try it then…" He turned to pick up a pair of chopstick.

"No! It's not good, Nii-san. Just throw that away, please." Yukio tried to take the plate away.

"Huh? No! I wanna taste it! Rin frowned, slapping Yukio's hand away. "My little brother who never cooked in his life as far as I know tried to make this, he even cut his finger, how dare you throwing this away, mister!" He said with a hint of mock in his voice, pretending to be angry. "Itadakimasu!"

Yukio face-palmed, horrible is an understatement when it comes to describing his 'omelet'.

Rin took the first bite.

Bland. "You probably forgot to add salt."

Bitter. "You overcooked the egg, but the onion and carrot are still raw."

CRUNCH! "Eggshells."

"Yeah, but I added some salt when it's on the pan and…" Yukio's voice died out slowly when he saw his brother took a second bite.

Rin's face twisted almost instantly, then he started coughing.

"That's why I stop you from eating it!" Yukio poured some water for him.

"I think—I just found all the salt you added in that bite. The salt it clumped, that's why everything else is so bland." Rin gulped all the water, then took his chopstick again, taking the plate and shoving the rest of the egg into his mouth, chewing.

"You will choke, Nii-san, what's wrong with you, come on, stop eating it!"

"Nhhoo! 'M gonn it ol ef itt!" (No! I'm gonna eat all of it!) His cheek is puffed, full of egg. He remembered how horrible his first dish was and how his father eat all of it despite the taste… No way in hell he let Yukio's first dish went to trash.

"Ah…" Rin sighed, wiping his mouth with the back of his hand. "More water, please?"

Yukio is still frowning, handing the water jug to Rin.

"Phew! That was… extreme." Rin said after taking a few more gulp of water, "Now, shall I show you how it's done, little brother?" He grinned.

WILL BE CONTINUED ON CHAPTER II

It's been a while since my last work on this series and I posted a short 1.5k ongoing chapter. I don't have any excuse, please forgive me. Next chapter should be up within a week (hopefully).

This chapter is as raw as Yukio's carrots, I haven't check for mistakes, I'm sure there are plenty of it, please forgive me (2).

I'm well aware of the illustration's mistake, looks like the manga is set in pre-2010 (around the time this manga get published and feature phones are still popular I guess?) I'll just pretend that it's 2017 and Rin somehow owned an iPhone.

By the way, the anime 'second season' finally ended and I'm sad (hey at least we get some Rin-Yukio moment in the end!), will we wait for another five year till the next animated arc? I hope this fandom won't be affected by this, since the manga is also progressing slowly.

Thoughts, comments, or reviews are really appreciated, seriously, reading a comment will always be a highlight of my week!

As always, thanks for reading!