If she starts loving the king then she would be playing with her feelings once again because after the first kiss, he will return to his original form which is a wolf of course and she would be left alone again. The king on the other hand shows his desperation to regain his true self so that he can return to his people.
Those listeners who have not listened to anything like this should also consider To Carve a Fae Heart and Kiss of the Selkie. Caitlin Davies has a couple of surprises for the audience as the narrator of the novel. This is like a fairy tale, the only difference is that the king is not turning into a human at the end.