You, Ace, Sabo and Luffy are always around each other, getting raised by dadan and always out in the woods, Ace is 10, Sabo is 9 and Luffy is 7. are 1 year younger than Luffy, making you 6. You 4 are always around each other and doing everything together

One day, Ace came with a bottle of Sake. Meeting you 3 at the secret place in the woods, You, Sabo and Luffy were already waiting for Ace

Ace: Well, let's just leave it until the time comes. Maybe we'll set out independently?

Luffy: Oh, you stole that from Dadan!

Ace: Did you guys know?! We can become Siblings if we exchange this cup of sake!

Ace said as he put sake in 4 little Red cups

Luffy: Siblings? Really?!

Ace: When we become pirates. we might not be on the same ship, but our brotherhood will always be with us! Wherever you are, whatever you do. we'll always be bonded together!

Ace: So from now on...

You 4 took a cup, holding it in the air, close against the other cups

Ace: we're Siblings!

You 4 began to chear, eagerly gulping the sake down. Making you 4 official siblings