Killua and you have been best friends for a while. Both your families were assassins that knew each other very well. After you both were old enough, you parents let you take on clients and go on solo missions by yourself. Today, you and Killua were talking to a new client in a warehouse at night. You sat on one side of the crate, the client sat on the other side. He seemed a little shaken, his bodyguard behind him watching you both closely. Killua stood behind you, smirking at the bodyguards seriousness.