Here we go. I've listed all the "subtext scenes" from our favourite couple.
I will start with Season 2, than Season 3, 4 and 5.


SEASON 2

2x09- The Last Word

Emily Prentiss's first appearance at the BAU - meetings with Hotch at the beginning and end of the episode. In the initial meeting, Hotch realizes that he knows Emily through her mother, and he inquires about her work and her parents. When she tells him she is due to being working with the BAU, he becomes cold and blunt with her, and says he never authorized her transfer to his unit. Undeterred, Emily waits for him in his office to meet him...