Disclaimer: I don't own any anime/manga from which characters are used in this story.
Three years ago on Dawn Island~
A huge explosion in the sky sent waves of shock everywhere. From it's center a large fire ball fell. Travelling at an immense speed, the fireball crashed into the ground making a huge crater in the forest. As the fire died down, a boy of 16 was revealed. He was burnt and unconscious.
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Luffy had trained hard, even more since Ace left Dawn Island three years ago. He had only 2 months left before he turned 17, the age he and his brothers decided to set sail. So when the rock he was about to punch with his new technique was blasted by a big ball of fire, he was pissed. Running to the center of the crater, he found an unconscious boy and not a rock as would be the norm. He was no genius but he was sure boys didn't fall out of the sky.
Confused, he dragged the boy out and took him to the tree house that he and his brothers built. The boy did not wake up for three days. On the third day, he suddenly woke up with a jump that surprised even Luffy.
Looking around the boy realized he was in a tree house that was badly built and that there was someone else there "Ahh! Who are you? Where am I?"
"Shishishishishi... I'm Monkey D Luffy, the future Pirate King and you are in my tree house. Who are you?"
"I'm Naruto, the next and the greatest Hokage!"
"What's a hokage?"
"Hokage is the greatest shinobi and the leader of Konohogakure" Naruto said with great vigor
"What's that?" Luffy asked confused.
Sweatdropping, "Never mind. What is a pirate king?"
"You don't know what a pirate king is?" Luffy asked astonished.
At Naruto's glare he put his arms high up for dramatic effect and said "He's the one who has the greatest freedom on the sea, the most powerful pirate in whole world!"
"Your hands! They stretched!" Naruto was shocked by the arms that hit the ceiling.
"Oh Yea.. I ate an akuma no mi. I'm a rubberman, see!" Luffy started doing different humanly impossible stretches that Naruto laughing loudly, until...
Two stomachs growled loudly
Monster meets monster after all :D
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Hunting had been too easy. Luffy knew the forest like the back of his hand having spent most of his life there. He quickly found a herd of deers.
"Fastest one to catch a deer is the winner" shouted Luffy before racing forward without a warning.
Naruto recovered fast and threw a shin kunai at one of the deer. Naruto was onto the deer no sooner than it hit the neck. In seconds Naruto had it down, dead.
Being a shinobi he knew how to hunt but he thought Luffy might need help.
"Hey that was so awesome! How's ya move so fast?" Luffy cried out from afar holding a deer that rivaled his own.
Or maybe not...
He threw the same kunai at Luffy and caught it before it hit appearing right in front of him.
"Cool ne?"
"Yea..." Luffy had stars in his eyes. "What else can you do?"
"Oh you have no idea" making the required seals, Naruto shouted "Taju Kage Bunshin no jutsu!" A hundred Narutos appeared in the forest. They quickly prepared the meat and a fire to roast it.
"Tadaa!" As the original Naruto finished off, all the clones puffed away leaving just the two of them.
"Sugoi!"
"You have seen nothing yet!" Naruto created a small, normal rasengan. As the blue ball of pure chakra formed on his hand, Luffy looked closely wondering what it does.
"Step away!" Naruto said with a determined smirk. He body flickered to a fallen tree nearby and pushed the swirling charkra onto the bark. The trunk burst into smithereens throwing debris all over. The rasengan finally disappeared leaving its characteristic pattern on the ground.
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Luffy and Naruto were lying down around the bonfire they built earlier.
"Hey Naruto, did you eat an akuma no mi?"
"What's an akuma no mi?"
"Shishishishishi... Even I don't know. All I know is that it's an awful tasting fruit that gives you special power, but-"
"But?"
"You can't swim, ever."
"That's a stupid condition!"
"Hell Yea! But... To me, that is also a precious gift from Shanks. He's a really strong pirate who saved my life when I was younger."
"Hmm.., I understand what you mean." Absentmindedly rubbing his stomach.
"Hey Naruto, I wanna fight you."
"Hahaha! Alright, but I'm beating your sorry ass"
"As if! You are going down. Tomorrow, after breakfast."
"See you there." Naruto was glad, to him, it was a sign of acknowledgement.
AN:
I want Luffy and Naruto's bond to be deep. They are both very powerful characters, similar and yet different. Next chapter will also have a bit of the past. Hopefully after that I can get into the plot.
I have an overall idea of what I want to do with this plot but I haven't worked out finer details.
I am trying to be flexible with this story, so if you guys have any requests, I'll try and integrate it as long as it doesn't affect my big picture.