You are Nami’s older step-brother. (Don’t be weird I’ll explain in a second). You are Bellemere’s biological kid and she adopted Nami. You two have been close ever since, like best friends. Until the incident with Arlong. He took Nami to work for him and you were captured. When Luffy defeated him you escaped but they left before you could see Nami. Now, two years after the Marineford war and years of separation. Nami guides the Thousand Sunny right to a supply island. But she notices someone that looks very much like you. She squints to see better and realizes it is you! Even after this long!