A/N: Genki desu ka, minna? Yeah! I'm out with a new crossover-fic about D. Gray-man! You have a certain tenisu-baka friend of mine to thank/blame for this. She has been very enthusiastic about anything D. Gray-man related. (AHEM, I'm looking at you, dear friend) Anyhoo ~ Let's start with this fic now, shall we?

I just realized that I loved to write in horribly small fandoms, such as this one. C'mon! D. Gray-man and Reborn! needs more love!

This will take place after the Inheritance Ceremony arc and sometime after the Attack on Black Order HQ arc. Please ignore the time difference, I know –man is set in the 19th century.

Kanda: Baka-Usagi, read this. *Hands over a piece of paper and storms away*

Lavi: Demo…Yuu-chan! But I don't wanna..! Ah! That's right! Moyashi-chan! You read this! *Shoves paper in Allen's face and skips away happily*

Allen: Eh? *reads aloud* 'Cebad2710 does not own D. Gray-man and Katekyo Hitman Reborn' What is this?

Somewhere in Italy, two people stood face to face in a darkened office of a huge mansion. One of them was a brown-haired teenager who looked no older than sixteen. The other was a young man in his early twenties.

Both wore black suits while the man had a fedora with an orange band. The boy had a pair of intricate silver rings—with the Tenth Generation Vongola crest and a lion design—on his middle and little finger. The twin rings were connected with a thin silver chain.

"Substitute tutor?" a brown-haired teenager asked the man that stood in front of him. The man gave a small nod and pulled down his fedora, his eyes now hidden in the shadows of his hat. The green chameleon resting on the rim of his fedora gave the teenager one of its odd smiles.

"Yes, Dame-Tsuna, substitute tutor. He will be your tutor for the duration I'm gone." The man confirmed in a deep voice. "Now that you are in a new school in Italy, you have a lot to catch up. I cannot let your studies drop just because I have a mission to attend to."

The teenager—Tsuna—had an expression that looked like a cross between relief, horror and dread. He had just came back from attending a meeting with the Ninth and he wasn't prepared for this.

"Ano…who is this substitute tutor…?" Tsuna asked. He was relieved that Reborn was leaving him alone but he was very afraid of the person that the Sun Arcobaleno had picked to be his substitute tutor. He gulped at the possibilities. Hopefully, none of the Arcobaleno is going to teach him.

To be honest, he would have loved to have no Tutor at all. But since he has denied the position as the official Vongola Boss—he wasn't sure if he was ready to lead a whole family and wanted more time to prepare before he took over the reins—Reborn had deemed that more training was in order.

Reborn chuckled at the fear and hope in Tsuna's voice. Oh, how he loved to scare his students out of their wits! The reaction he gets whenever he keeps the suspense had always been worthwhile. He gave his current student a dark smirk before answering.

"You'll know when you meet him, he's pretty recognizable." Seeing Tsuna gulp once more, Reborn couldn't help but add in another sentence. "Since he is quite a good friend of mine, he has agreed to keep you in shape too, treat him well." At that, Tsuna visibly paled.

A good friend of Reborn's is never good news. Oh no, why was he always stuck with the worst of things?

"Enjoy your stay with him," Reborn said sadistically and exited the room. Ever since the Arcobalenos' curse had been lifted, the adult Reborn had turned out to be even more sadistic than his baby self.

Tsuna watched with dreadful eyes as Reborn entered the black Mercedes parked outside the Vongola mansion a few minutes later, leaving him to face his horrible fate.

And that's the prologue! I just realized that this is horribly short for even a prologue (513 words). But the second chapter will be a whole load longer, haha! Stay tuned!

Please review! (The number of reviews I get shall determine if I shall continue)

Arigato!