New Trouble (The Avengers)

When the new girl, Mia, joins the Avengers on a new assignment, she thinks it will be fun and easy working with the team. But when she is told that her greatest enemy, Loki Laufeyson, has returned to Earth for revenge, she is lost. But it doesn't end there. Her sister, Helle, has changed her ways from good to bad and came to Earth to kill everyone, including her sister. But along the path of bringing justice to the two, Mia finds love with both Clint Barton and Loki. Even though she knows that it is a great weakness that anyone could use against her, she is too lost in the founded love to end it. Will Mia be able to find her way though this? Or let everyone down and let them take their revenge?