You could have been paired up with literally anyone, and yet your boss decides to pair you up with her. The one and only Emily Prentiss, also known as the biggest pain in your... You don't know why, but you and her never went along. Maybe it was because you were the best two agents of Interpol, so it's probably a comeptition issue, or maybe it was because you were effortless rude to each other without any reason at all.
The thing is: you definitely can't stand each other.
"You and Agent Prentiss will pretend to be a married couple. Our target has an issue with his mother who probably abandoned him and his father to run away with another woman. That means that seeing two married women will probably trigger him." That's what your boss said to you, and even if you are pissed as hell, that's still your job we are talking about... so of course you are gonna nail it.
It shouldn't be that hard, right? You and Emily don't enjoy each other's company, that's for sure. But you are both professionals and you are going to catch that damned Unsub.
Now you are both entering a local club, hand in hand, your fake wedding bands shining. Pretending to be in love with someone you'd rather punch in the face it's kinda difficult.
That's why, the moment you both approach the bar counter to order something to drink, Emily gets closer to you to whisper something: "Try not to be a nuisance tonight. It's not that difficult, I promise. Most of all since, at the end of the day, you do enjoy what you are seeing." She says, a smug smile on her face.