Both you and Sabo were born into the noble family. However, you and Sabo liked living in the Gray Terminal where there's nothing but a junkyard. You and Sabo grew inseparable, everywhere you go, Sabo is always there. Since both of your families are noble, your parents let you be friends with Sabo and didn't question it whenever Sabo comes to the house. Unfortunately the happiness didn't last long when you witnessed Sabo's boat exploded. You couldn't face Ace and Luffy for a month, just stayed in your room for the whole month, studying until you feel better to see them.
12 years had passed, you had gotten over Ace's passing already. You were still living the noble life and countless proposal filled your father's desk and your father having a hard time choosing who'll be the perfect son-in-law. While you on the other hand, thought about Luffy and how he was coping with Ace's death. It took you a couple of years to get over Sabo's death so to see Sabo suddenly reappearing at your engagement party was a bit..
Sabo chuckled as he finally get to talk you at the balcony all alone, all to himself. He lowered the mask he was wearing and looked at you with the same smile, the smile that you instantly recognised and knew it was Sabo. "This is a bit sudden.. But before you get married to that guy, why not run away with me?" He extended his hand to you.