Hussar
Legend
Now, a question. Does the Thief player know about this?
I sure hope not, as the Thief PC doesn't know either; and this is one case where player knowledge and character knowledge should be the same. With time and some luck the idea is that it eventually comes out through play even if words aren't involved much - he always leaps to her defense before defending anyone else in a battle, for example; or stands up for her interests in any disputes, etc.
But, what if the Thief player wants nothing to do with this? What if the Thief player has entirely different ideas and just has no interest in your entire background. Does the Thief player have to suck it up and deal with it or should the Thief player have some say in how the group is going to interact.
I've met more than a few players who have zero interest in romance in an RPG. Just not what they want out of the game. Makes them feel very uncomfortable. Heck, whatever the reason.
Isn't this blindsiding the Thief player? I could see it working, but, I could also see this going very, very badly.