A few questions I asked for Ran and a few I asked myself.

Can any noble have a paramour regardless of gender, rank, or marital status? For example, an unwed young heiress having a paramour.
No comment.

Could each partner in a marriage have their own paramour?
Yes, but it would depend on the rank of the partners.

Is homosexuality tolerated to an equal degree for women as it is for men? If so, can one's paramour be of the same gender?
One's paramour can be of the same sex.

Is Waters the noble bastard name for KL and the immediate region (such as Stokeworth and Rosby) around it?
Yes.

Are Prince Duncan the Small and Duncan, Prince of Dragonflies one in the same or are they different people?
They are one in the same.

King Maekar I Targaryen died in battle against an outlaw lord. Was that outlaw lord a Blackfyre Pretender?
No.