Incorporate what? if you mean their selfs then i would say by giving a spice of them self or make their story have some character that relates to them, but then again the story itself is them already.
Answer:
I think that the princess sent her lover to the lady because she loved him too much to see him die. We can see this from her fears about the lover being torn apart and because we know how much she loved him.
The First Step Is Make An Appropiate Graph