Shadows Can Protect Us [Male reader x Natasha Romanoff]

"Few presidents have ever granted the Fifth Freedom. It's the right to defend our laws, by breaking them. To safeguard secrets, by stealing them. To save lives, by taking them. To do whatever it takes to protect our country. The Fifth Freedom is mine alone. I am Y/N L/N. I am a Splinter Cell."

Y/N L/N is an covert agent, working in the shadows to prevent those living in the sunlight from threats none of them may ever know about. While usually specialising in solo covert ops, he is now on a mission that will force him to work with another agency, one which he doesn't trust.

However will he be able to put aside his mistrust and work with another agent in order to stop a threat that is bigger than he has ever seen?