Emma Holly is sort of a go-to author for erotica, and I was interested to see what she'd do with this fanciful fairy story.
And...it was OK, and sorta hot in places...which is what you'd expect from an Emma Holly book. Belle inherits her uncle's house, which contains a portal to the Faerie plane. Dubhghall, a fairy prince, escapes from his mortal enemy through the portal, and meets Belle. Lots of pretty hot sex follows really quickly.
Since it's such a short story, there's not much time for Holly to do a lot of character development. Belle's a sympathetic heroine -- she cares about people and wants to do the right thing. Dubhghall is an incredibly hot fairy hero. Initially I found him hard to like, since he comes across as a little shady -- withholding or distorting facts to suit his situation. However, as you get more into the story, and he falls hard for Belle (and she for him), he mellows.
The 'big reveal,' when Belle finds out who he really is, is sort of anti-climactic. When Dubhghall is later reunited with Belle, it's very sweet.