Jasper approached slightly out of breath, "Romanoff I collected the knife you said he threw at you. You might want to see this?" He sounded unsure. It was so unlike Jasper that she did turn to see what had him so uncertain. The moment she saw the knife and the symbol engraved into its hilt. That was the sign of Medusa. Jason Bourne served in Medusa.
Five years ago Natasha Ramanov joined SHIELD and gave Coulson and envelope. If anything happened to her he was to open the envelope. In the entire five years he never had to ooen it. When a mission goes FUBAR he is forced to open it. Inside was a pair of dog tags and a phone number. This will lead him to one of the most dangerous men in the underworld.
If Aaron Cross had a sister that could morph into any animal that's how she got on S.H.L.E.I.D. Read to find out how he works with Avengers WITHOUT OUTCOME coming after him and his sister
He remembers himsefl more and more as he watches the security logs of the woman that used to be Marta Shearing – she calls herself Rebecca Gordon, owns her new identity with ease. She has shed skin after skin in the two years they've been apart, like a snake (like a taught her to). Remembers that he's been watching over her a long time. That had been the deal: a life for a life.