Y/n Vostokoff is the youngest sister of Natasha Romanoff and Yelena Belova. On a mission in New York on Christmas are Y/N and Yelena planning to kill Clint Barton, because he killed their beloved sister Natasha, but on a Christmas party from their contractor Eleanor Bishop they meet her daughter Kate Bishop, and Y/N starts to like her or is starting to feel something for her... But Y/N doesn't know, that she is working with the Hawkeye Clint Barton.