Arrow Through The Heart (Hawkeye X Reader)

You have been an archer since your parents were murdered. You and your older sister both ran away from the foster homes and now live in an apartment in New York. The two of u have special abilities but you both hide them with your weapons. you are and archer and your twin sister is a swordsman. (i think that's what they are called). While skimming the rooftops. you see the Avengers in a battle and one of them was about to get attacked from behind.