When I started the anime the thing that stood out the most for me was the idea that this peace between the two of them only worked because of their lies.
At every point both of them have chosen to put their country above anything else, so I wonder what will happen if she comes clean. Loid will likely get shocked, keep up the lie and act accepting of her job, the question is whether or not he'll report this to his superiors and if he'll feel guilty about lying to Yor after she gathered the courage to tell him the truth.