- Natasha – What do you want me to be?
- Steve – How about a friend
- ―Shut down
Captain America and Black Widow had a son together named James Rogers.
Steve and Natasha first met during the "The Avengers" events on the Helicarrier. They worked cohesively as a team defending New York City. There were few interactions between them, while they were fighting or checking up on each other.
After the Battle of New York they have been partenred for different missions, probably for two years. One of which was shown at the beginning of "Captain America: The Winter Soldier". We can see that they've become close friends. After rescuing the hostages of the S.H.I.E.L.D. Steve was given a USB drive, which had been filled with some S.H.I.E.L.D. intelligence earlier by Natasha. Lately Steve hided the USB in a vending machine at the hospital. But when he visits hospital again, he finds out that the USB is gone. Natasha appears from behind and reveals that she had taken it, and he angrily asks her what she knows about all that has happened. She tells him that the masked man is an assassin known as the Winter Soldier, and she had encountered him once before. She decides to follow Rogers. Under cover they go to an Apple store to see if they can access any of the valuable information on the USB. They act as an engaged couple, and while they are riding escalator, Natasha kisses him in order to hide from Hydra agents.