I think he slept with her solely for a child. I believe that it was because he loved and is obsessed with her. Because if she conceives, it is also going to be his child.
It may also be that he keeps her by his side and is looking for a way to continue so as he did not fully know the power fight between the MC and the high priest.
It may also be that he keeps her by his side and is looking for a way to continue so as he did not fully know the power fight between the MC and the high priest.