Oh, and one little thing about the ascending storyline made me feel like this was the deathblow to the romance and couldn't give the happy ending:
If you decide to let him make you his spawn and you pass the insight (or maybe it was mind reading) during the sex scene, you learn that while he demands you to get on your knees, he'll also resent you if you do. I think it's a great example of writing where the character doesn't actually want what he wants. It's great and it's horrible.