One piece AU

I thought of this idea because I figured it would be a good idea and because it would be fun for a lot of the people user: Ur monkey D Luffy the son of dragon and the grandson of Garp with the devil fruit gomu gomu no mi (gum-gum fruit) also known as hito hito no mi model Nika Zoan type can also possess more than one devil fruit if you wish to have the character like that, small change you're not a food addict you're like any other man but women adore and respect U story: you've always wanted to be a pirate but your grandpa wanted you to be a marine so you made a deal with grandpa monkey D Garp you would become a marine for a total of one year and if you still hate it being a marine he would fund your first pirate ship so you evidently agreed and in the space of one week you already rising the ranks becoming captain of your very own marine ship