Disclaimer: I do not own One Piece

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Do you know what it's like to be treated like an animal? Eating food in a plastic bowl, following simple instructions, and having a collar tightened around your neck? There are some people who know what it feels like. Some think of it as some stupid SM fetish. But others, like a boy named Nail, are forced to wear it because he was a slave. Stubbed around that collar was a giant tooth from a tiger.

Nail was an obedient boy. He only wore a brown shirt tattered in the bottom by claws. He dressed in brown shorts; his knees were all scraped by claw marks. His brown hair was greasy. Shampoo was cheap. His master, Lord Marget, didn't buy Nail any sundries. Nail was just a dog and an assassin to him.

Nail was about to fight five wolves. They were much bigger than normal wolves, because they were Grim Wolves. Some say that Grim Wolves are pets of Grim Reapers and they help their masters harvest their souls—but they don't quite take the soul out. They nibbled at it first, and then they rip through their stomachs like a roosted chicken.

Nail was inside a giant metal, spike barbed cage. Outside rich people were betting who was going to win the fight. All bets were on the wolves. No normal human, one who never ate a Devil Fruit and has never been in a war zone, could beat five wolves. Especially not Grim Wolves.

" You are my possession. You have no family. If you want to live I suggest you be a good dog and do what I want. If you don't, I'll leave you on the streets where you belong, you mangy dog."

Nail touched the ground and backed his feet up. Under the fluorescent light of those heat lamps, he howled.

" AOOWWWWWW!"

The five Grim Wolf roared and stampeded towards Nail like a herd of wildebeests. The first Grim Wolf ran ahead of the pack and lunged towards Nail. Nail deftly moved back, evading the wolf's claws. This time Nail lunged forward. He uppercut the wolf sending it flying off the ground.

The rest of the four ran up to Nail and attacked. The wolf's cleaved their claws at him. Nail tried backing up away from them, but he didn't move fast enough. The wolf's scratched through his shirt and his arms. The scratch wounds left small trickles of blood to pour out of him. Nail jumped over the wolves and ran to the other side of the cage. Nail looked at those little scratches on his arm. They sting! If he didn't wrap them with bandages they could get infected, and Nail would have his arm cut off. Nail stuck out his small tongue and licked the blood away from his right hand. His right hand was cleansed.

" Freak," a man behind the cage said.

Nail didn't listen to words of prudent humans. Nail hated rich people. They talk about having power and can rule kingdoms, but when it came to fighting one-on-one they were as helpless as mice were against cats. A second and a third Grim Wolf charged towards Nail at fast speed. They were so close together they were begging for collateral damage. Nail jumped over the wolves, span around making a cart wheel with his legs, and kicked both wolves in their faces. He grabbed them before they fell and bashed their heads together!

Only two wolves were left…three. The one Nail took down before was getting up, and it looked even more fearsome than ever wanting to devour all of Nail.

" This kid is fast, but he won't last much longer," a man in the stands said.

" I'm surprised he made it this far to begin with," a woman in the stands said. " He's got lots of excessive energy inside of him."

" He's a freak," another man said. " Just look at that collar. He's just not normal."

Nail didn't have claws, he didn't have fangs other than his small canines, and he didn't have a tail, but he was every bit an animal. Humans can learn different things. When their small they can change their goals or let themselves be taken by traumatic force. Nail only knew how to fight, how to hunt, and how to kill. It was the only thing he was good at.

Nail scratched the air with his imaginary claws. The wolves galloped like gazelles towards him, and lunged at him together. Nail moved his hands with the speed of an angry typhoon. He punched the wolves under their jaws. Every spectator watched him kill two wolves before their very own eyes and grab one Grim Wolf. He crunched his teeth down on that wolf's neck. It yelped. Everyone in the stands shuddered in disgust as Nail ripped through the fur of the wolf's neck and swallowed the piece of meat he ripped off.

Nail won. Blood of the wolves trickled down Nail's fingers. Nail put his fingers to his mouth and licked the blood off. The cage door opened and a man walked inside the cave. His white coat glowered in the fluorescent light. His white hair was underneath a brown hat he wore over his head. The man walked up to Nail and placed his hands on his shoulders.

" How does victory feel, my perfect pet? You enjoy the taste of it, don't you? We won't stop here. Your skills will flourish and I will be richer than any Yonko. We will throttle."