Hi everyone! I hope you'll enjoy this! My first fanfic so chapters are a little short. Have fun!!!

Prologue

Police sirens sounded in the distance. They knew they didn't have much time. "Are you sure? We are stronger together." She didn't want her to leave or get in trouble. "No, this is my fight. I'll be fine." The two sisters argued. "Ugh, fine" Yelena eventually agreed. "You better escape." "You know I will" Natasha smiled. "Well, I guess" Yelena started "You should take this." She took off her vest and gave it to her sister. "I know how much you like it." Natasha tried to refuse, but she noticed she could never convince Yelena. "It does have a lot of pockets." She smiled. "Very handy pockets, yeah." Her sister agreed. Yelena gave her a hug. As Natasha walked off between the wreckage of the Red Room they had just made, Yelena whistled. One higher note, one lower note. Their special thing. Natasha looked at her, she whistled back. One lower note and one higher note. They would always find each other.