She is mine

Y/N is a hydra experiment from a base in Germany. When the Avengers destroy the base in Germany, Y/N escapes. Y/N has been on the run from Hydra ever since. S.H.I.E.L.D is looking for Y/N to protect her. Fury sends Natasha Romanoff to find her. But S.H.I.E.L.D are not the only ones looking for Y/N. Yelena Belova is also looking for Y/N. When Yelena and Natasha meet, the two sisters can come to an agreement and work together or they will fight each other.