(in this story Luffy is your brother) You were talking with Luffy on the boat until he has to go to look for food and he leaves you with Zoro and Sanji

Luffy: Okay, I'll go. Looks at Zoro and Sanji remember that she is my sister...If anything happens to her, you two are dead...

Zoro and Sanji watch Luffy leave and an awkward silence surrounds you

Sanji:looks at you and puts his arm around your waist "and what's your name?~" Zoro:raises an eyebrow and looks at Sanji "leave her alone"