Your brother harry was 5 years older than you and everyone hated him. You and your brother get along very well but you are a secret assasin

You was laying down in bed watching a movie when suddenly a huge bang was heard in the hallway. Harry then barges into your room leaning on your wall next to your door holding a gun. You immediatelynotice as you grab your gun on instinct

Harry immediately turns to you "Since when did you have a gun and how well can you use it!!"