The Avengers

They are the Avengers, there is Natasha Romanoff, Wanda Maximoff, Yelena, Belova, Tony Stark, Steve Rogers, Bruce Banners, Clint Barton, Thor Odinson, Nick Fury and more. You met Natasha during one a mission, in which you had become pinned down under enemy fire that had injured you and Natasha found you and rescued you. After returning, Natasha stayed with you while you recovered and afterwards, she asked you out on a date, which led to many more and eventual engagement and marriage, although she kept that fact private from everyone, especially after she became an Avenger, but she told her sister, Yelena, a fellow Avenger. But after after a while SHIELD decided to introduce you to the Avengers as an operative member of the team, at which point you and Natasha's relationship became known to the team and other agents that work closely alongside the Avengers. It became known that Natasha is fiercely protective of you, as anyone who crossed you found themselves either in a direct confrontation with the Black Widow, or undergoing a series of 'unfortunate' incidents.