A/N: Since I have this really weird idea of Tsuna being a devil or the Sin of Sloth, I'm writing this. I also love R27 so this might have slash or yaoi or boy's love.

Summary: AU. To think he was a powerful demon, too. Tsuna really should really train to be logical and intelligent. He can't believe he had fallen to a trap by that hunter. He just knew he won't be able to show his face in Hell. Well, technically it's true. He was trap with Reborn in the Human World after all.

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Soul Binding Deal
Prologue: Confirming Deal

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He is one of the seven devils that are given an individual deathly sin to carry. He is Sloth, one that devours those who wish for nothing but lazing around, one that grants the wishes of eternal sleep with the price of their souls, one who takes the innocent in the act of indolence.

He is a devil underneath the innocent and curious form, the devil no one can expect nor suspect. He is that who gives a warmth and kindness you can see through an angel...

Yet when you put your guard done, he will attack mercifully like the devil he is.

Sloth, Belphegor, Acedia, Hypnos, Nemui*, Kitsune*, Sleepy Ash*, Sawada, Taida*, Vongola, Blue, Socordia, Cielo, Sora...

He is called by many names. But only one is the true name. And no one alive can hear to tell. That one name is...

Tsunayoshi.

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Boredom. That was always what the devil could feel. It was part of his sin, after all. He never minded at times but in a place, where he could no sleep like where he was now, it went to saying how boredom could kill him.

"I'm still stating my terms," the human, a practically tall raven-haired man, who overpowered him terms of height, stated bluntly like he wasn't talking to a devil that could and would kill him if he was too annoying. Not that he could really blame the mortal for being stupidly unguarded.

The Devil of Sloth, Tsunayoshi, was in a form of an innocently looking brunet teen with big round honey-brown eyes that clearly distinguished him as someone who couldn't even hurt a fly. It was a form he would enjoy attacking. The look of the sheer surprise followed by terror was pleasing to his eyes.

"Brat, you really should pay attention," the mortal once again commanded and the demon snorted at being ordered around by mere humans but nonetheless, followed. He was in a hurry to go home to Hell and sleep as his Sin wanted as well. "I want you to allow me to sleep peacefully at night for the rest of my life."

'That's it?' Tsunayoshi wanted to bang his face to the wall. To think he was summoned just for a simply wish, Sloth wanted to kill the human right there. "That's easy," he replied, seeing as the raven head was waiting for his answer. "And your other terms?"

Making deals and terms were life of every demon once they were summoned to the Human World. Those who could come and go as they pleased in the surface were only the high ranked demons like him. However, it was a strange occurrence for someone to summon Sloth. Usually, it was Greed or Lust.

The creature of Hell glanced at the creature in the surface. He was simply curious to the one calling him. That's why he answered the call. In all honesty, he could ignore it. His Lord wouldn't mind since he had said they could do anything they wanted as long as they never break the five main rules of Hell.

"You have to be here when I wake up," Tsuna froze at the first term and narrowed his eyes, hinting a glint of orange. This man, he couldn't put his finger in it, was off. "I want to be sure that you're doing your job and mot slacking off."

"I have Sloth," the brunet deadpanned and he was even surprised that he was considering the deal or making an effort to listen. Sure, the man's soul smelt delicious but he was still his sin. He was no hard worker. "And what's to say I would agree with the deal?"

"You already agreed," 'What?' The devil was definitely confused. He never— "You commented how it was easy and asked for my other terms so I assumed you agreed."

"Tch," the mortal was either sly or... He glared at his summoner and immediately went on guard. "Who are you?" This man planned this from the start.

"I already told you," 'Not listening,' Sloth snicker slightly and it made the fedora man paused a little before continuing. "But since you asked nicely—" he could just hear the sarcasm, "—my name is Reborn, Dame-Sloth."

"Well, Reborn, I must politely decline," he started, his eyes really turning into a narrowed orange and losing every innocent it had. He had obviously ignored the nickname since it would make him more annoyed. "I don't want any part of your deal and any other demons would gladly accept."

"And like I said before you already agreed to my point of view so the deal's solved," Reborn didn't miss a beat and the lazy demon grew even more caution. It was strange how the human seemed to be in control and seemed very knowledgeable. He even seemed to know about the rule in making deals.

"I still don't want to and if I have to kill you so I won't do it, then be it. I will kill you," that was a lie. He couldn't really kill the one who summoned him unless he was given permission by his Lord but the human didn't know so it was okay to lie, right?

"You can't. There's a rule about Your Lord forbidding any demons from attacking their summoners for the pride and respect of the Underworld, right? There are five rules in Hell and one of them states that summoners are to be treated with respect so no killing, right?"

Sloth was sure he had just been pulled into a trap again and for this time, he wasn't so sure if he'd be able to come back. His intuition had finally started working and it was warning him of something. That something was this man's aura. His once again honey-brown eyes widened, noting the man's smirk.

'Kuso!* He's a Hunter!'

Apparently, the Goddess of Fate had a slight grudge on him and made the predator become the prey and vice versa for once.

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End of Prologue

*Nemui – means sleepy
*Kitsune – mostly known as Fox but can translated as "come and sleep"
*Sleepy Ash – from the manga, Servamp, representing Sloth
*Taida – meaning laziness
*Kuso – sh*t or crap

A/N: Now, what do you guys think? Good for a next chapter? Kinda bad? Anyway, who do you guys think are the sins? Tsuna is Sloth so who's the others?