Clint/Natasha tagahanga Fiction - From The Beginning 

Clint meets Natalia Romanova, the dangerous KGB agent he's been sent to eliminate, but she is not what she appears to be. Clint decides to make a different call, and in that instant, changes the course of both their futures.
keywords: ang mga tagapaghiganti, black widow, hawkeye, natasha romanoff, clint barton, tagahanga fiction