Scenario:
The day you met (crush), you noticed that they were rather peculiar. They would constantly try to be excused, hide out, and even just leave from somewhere all together. One day, you decided to follow them, and once you did, you unvield their biggest secret. They were a spy! But now that you know, there could be danger afoot.
Scenario 2:
Same as 1, just oc is spy
