Author's note: Hi guys and gals! It's been a while since I posted another fanfic here at the site. Hopefully I won't be discontinuing this because of major plot twists happening within the two anime's I'm using for this crossover.

Thanks to Ao no Yoru and Hikou no Kokoro for the beta~

Disclaimer: I don't own KHR or Ao no Exorcist. It belongs to its respective owners.

Original Release: 09-11-11

Edited Version: 09-18-11

IMPORTANT! READ THIS PLEASE:

The timeline for Katekyo Hitman Reborn is right after Inheritance/Shimon/Daemon Spade Arc in the manga. The timeline for Ao no Exorcist (Blue Exorcist) is a week before the start of the canon. However, I'm going to change a few things with Blue Exorcist.

Rin has used his Flame before and had become an exorcist under Shiro (and Yukio). However, he's still a Page. Also, he doesn't have control over it like Episode 20 of the anime. I'm using the anime instead of the manga because I know that the stories are slightly different.

So without further ado, here's the story!

Green eyes looked up at the sound of the door. "Rin-niisan, welcome home," the teen greeted his brother before returning to the book he was reading.

"Ah. I'm home. Yukio, where's Tousan?" Rin asked after looking around for the old man.

Yukio took his attention off the book. "He was called for a mission," Yukio answered. "He won't be back for a few days."

"And he left me here with you," Rin grumbled.

"What was that Niisan?" Yukio inquired, craning his neck around to look at his brother directly. He set his book down, smirking as he waited a repetition of Rin's words.

"N-nothing! Nothing at all," Rin tittered.

Yukio sighed. "Niisan, you know why we can't bring you to missions yet."

Rin gumbled, "I know… I know."

Yukio looked at his brother with sympathy. If only you didn't hold his flame.

Tsuna sighed as another day passed by uneventfully. After so many things happened because of Daemon Spade's vengeance, the lull of activity made them uneasy. Tsuna was already expecting something to happen.

Or rather, Reborn would plot and make them do something again.

Reborn looked at his student. Perhaps it's time for his Spirit Wound… after all, Satan's son already awakened. If only Daemon Spade didn't launch the attack, Reborn would have done the initiation months ago.

Leon morphed into a phone and Reborn put it in his ear. "Ah. It's me," said Reborn when he heard a click. "I'll be expecting you then, Mephisto." Reborn closed the Leon-phone which promptly morphed back to his chameleon form.

Reborn looked at his student, then to Leon. "The next days would be fun. Wouldn't it, Leon?"

Mephisto set down the phone and smirked. "So the Flame-keepers finally came," he said.

"Who?" a teen with dark green hair asked. He has a spike of hair which is lightly colored compared to the rest. He wore a jacket that has cross bones as buttons. He also wears green arm warmers and a black and pink short sleeved shirt, which is of the same color as his spike, under his jacket which is ripped at the ends.

"You'll see, Amaimon. You'll see," Mephisto replied and picked up the phone again.

"Yes? Okumura here," a voice from the other side answered.

"Okumura-sensei, can you and your brother come to my office right now? Also, bring your equipment," requested Mephisto.

"Niisan too…?" Yukio asked. "Yes sir. We'll go there now."

"Good, good. I'll be waiting." Mephisto ended the call and sat back, thinking of how he could use this opportunity.

I wonder what Mephisto-san wants with Niisan and me… Yukio thought as both of them prepared their stuff.

"Yukio, am I going to bring Kurikara?" Rin asked as he opened the cabinet holding said sword.

"Yes, Niisan," Yukio answered.

Rin took out the sword Kurikara and slid it in its red cloth container.

"Are you ready to go, Niisan?" Yukio asked. He was already in his exorcist attire.

Rin slipped the sword holster on his shoulder. "Yep. I'm ready."

Yukio took one of the keys given to him by Mephisto and inserted it through a locked door.

Mephisto grinned at the entrance of the Okumura twins. "Good afternoon to you both and welcome," he greeted and gestured for them to sit.

"Why did you call us here, Mephisto-san?" Yukio asked as he sat down.

"Business first as always neh, Okumura-sensei?" Mephisto said amused. "Well, I'm giving you two an interesting assignment."

Rin's ears perked up. "What kind of assignment Mephisto-san?" he asked excitedly.

"A friend of mine needs assistance in giving his charges Spirit Wounds," Mephisto grinned mischievously.

"So they would be budding exorcists then," Yukio said and nodded. "Where will we be going?"

"Namimori."