Everything Has Changed (A Chuck Fanfic/Charah Story)

*DON'T HAVE TO WATCH THE SHOW TO READ THIS! IT'S AU* Sarah Walker is the CIA's best. She's Director Langston Graham's wildcard enforcer and she's been with the agency since she was a teenager. After years of service, she is partnered up with Agent Charles 'Chuck' Bartowski, a guy who is sweet and nerdy but has only be...