Hello. I ended up here after scrolling through and find this topic to be interesting.
If this would be in the final Game, then there should be consequences and the Game should act like in that time.
For example:
Such a relationship could only work in secret. Therfore it can generate some bonuses like passively getting higher alertness.
If you get caught by church or guards you go to court and lose a lot of reputation in that medieval society.
Worst case, if your reputation is not high enought, that the church fears your influense, you could be exorcismed or get hanged.
We are still talking in medieval context here.
There are Storys about such relationships.
In most situations men marry a woman and have their lover.
With a woman at your side the church will not notice such thing easiely.
Additionaly this all will bring the backside of the "good Church" into the game. I think this could be an interesting game aspect.
It could be very interesting to ceep such secret as a player. Makes the game more challenging.
That are my thoughts about this topic.
