I’ve heard that Duainfey contains disturbing sexual content. I mention that as a word of warning, in case you’re a reader who dislikes that sort of thing.
That said, I can’t speak to that personally. I didn’t get that far. Duainfey starts with an overly-confusing prologue set in the Fey realm. I was never quite sure what was actually going on in this scene. Then, the story shifts to the doings of a human family in Regency society.