Eh... while this is a "mileage may vary" kind of situation, I do find that Owlcat's writing and especially romances are very awkward and too verbose for their own good. Comparing Arueshalae to Grace is very generous, in my opinion, as the former, while possibly inspired by the latter, feels like she went through at least two "generic anime girl" filters first. The scenes (especially in Kingmaker) are a trope after a trope (helping your to-be-queen to fasten her armor while awkwardly blushing is painful to read...), and their tendency to blurt out huge paragprahps with little to no formatting and clear Russian roots in their composition and sentence structure also make reading them somewhat harder.
That's why i mentioned they tried to recapture Grace with Arue, the concept is basically the same about the succubus not being evil cause of circumstances(but English isn't my first language, so i can end up missing the mark when it comes to sentence structure/explaining), didn't say they succeeded ^^"; Besides, i would define Arue a sort of disney princess, more than a anime girl... especially for the last mission in her quest chain.
On the Kingmaker part, i omitted any mention cause i don't want to be reminded.
