Y/n is a product of hydras handiwork; over years of abuse from Hydra they finally complete her defection to S.H.I.E.L.D becoming close with Fury. Joining the Avengers with the past coming back to haunt her, afraid she'll hurt the Avengers more than herself and eventually falling for the superspy Natasha Romanoff. Who knows how the allusive Ex-assassin feels about Y/n? (Warings for blood, graphic detailing, smut and upsetting themes. For obvious reasons I don't own any of the characters, but the story is my own.)