Ace: I was bored one day and came up with this after hearing about Mephisto's cooking. Warning: Some OOC characters, craziness, some cooking tips from Mephisto, and an angry Rin.

Disclaimer: I do not own Blue Exorcist

Chapter 1: You suck, Rin

Yukio

My lesson plans for the week were almost complete when Rin walked in holding a cone topped with three scoops of ice cream. He didn't have a bag with him, so I raised my eyebrow.

"It's too damn hot out there," Rin complained. "I was in line forever to get my ice cream..."

"That's nice and all," I replied, "but did you get water or chips like I asked? And did you grab some ice bags too?"

Rin thought long and hard. "Um... No."

My face slammed on the desk. I had more than enough stress, but my stupid twin made it worse.

"Dammit Rin... I ask you to do simple things, and yet you never do them! Why is that?"

Kuro, Rin's familar, jumped onto his desk. Rin attempted to look at him, but I slammed my fist on my desk.

"Answer me!" I yelled.

"I accidentally forgot... And there's no need to get angry about it!" He snapped.

"I'm angry and frustrated because you can't do simple tasks! If you can't do that easily, then you cannot do anything else! And video games do not count as doing stuff!"

Rin finished his ice cream and held his hands out. "Fine."

I sighed. "At this rate, I might have someone go shopping with you to make sure that you don't mess up again..."

Rin growled at me. "I don't need a freaking babysitter! Kuro, we're going out!" He turned around and stomped off to the door, with Kuro following him. As soon as he slammed the door behind him (and nearly broke the door), I sat back in my chair and rubbed my temples.

Mephisto entered the room a few minutes later, slightly confused. "Why did Rin just walk out of the room in a huff with Kuro?"

"He's acting like a child, like he always does," I grumbled.

"What did he do this time?"

"He doesn't follow simple shopping instructions. He really needs to know how to act like a grown-up."

Mephisto was quiet for a little bit. "I could help him. I need some items at the store, and I could teach him some responsibilities as an older brother, like picking out the right foods and how to cook proper meals."

"You would?" I looked up hopefully. Maybe if someone responsible went with Rin, he would learn how to be an adult quicker.

Mephisto nodded. "I will."

"Thank you. When will you do it?"

"As soon as I find Rin and Kuro, I'll take them to the store and buy groceries with them."

"Good luck," I told him as he left the room. I turned back to my lesson plans and continued to work, happy that my twin brother would learn some responsibility after all.

Ten minutes later, I dropped my pen suddenly and looked out the window.

What have I done? Did I really let Mephisto teach Rin how to buy food and how to cook?

The last time Mephisto cooked, it didn't end well. Now that he had Rin helping him, it could only mean one thing: the apocalypse.

Grumbling, I sprung out of my chair, and slipped my coat on. I had to find my brother quickly before a lot of disasters occurred.

The next time my brother is being an idiot, I thought angrily as I grabbed my gun, I need to be the one who teaches him to be an adult, even if I have work. Because if I do, someone might die.

I dashed out of the room, ready to go find my brother.

Ace: I don't know whom to feel sorry for: Rin or Yukio.

Anyhow, when Mephisto gives his tips, it's just him instructing his assistant(s) how to prepare a certain dish. Which might end in disaster 98.9% of the time.

If there is a dish that will be perfect (or disastrous) for Mephisto to make and I have written it, you may state so in your review, and it will be incorporated into the story. I also have several ideas that will end in multiple different ways.

Ace