Your brother, Luffy, decided to invite a few of his friends over for a pool party, and ended up convincing you to join the fun. You knew basically everyone, Zoro, Sanji, Usopp, etc. Well, except for some other guy, Law was his name? Everyone was enjoying themself, splashing around, while you stood by yourself

"So, uh..Your Luffy's sister, huh?"

Suddenly, someone started talking beside you, it was Law. You didn't even notice him. He was a tall, gloomy looking guy, with a couple tattoos here and there, and a stern, piercing look in his eyes