This story is, primarily, a work of erotic fiction.
It includes sex, and a lot of it, and intimately described. The copulation constitutes a considerable part of the plot. Some would call this PWP, and they're probably correct. If that makes you uncomfortable, if it isn't your thing, then I'd advise you to head back to the lobby and try a different story.
Personally, I highly recommend Inverarity's Alexandra Quick series (start with story ID# 3964606) and mj2007's We Belong series (start with story ID# 3840380); if you head offsite, try momotwins' The Unsinkable Molly Prewett over at . They are all incredibly well-written stories that are also free of significant sexual content.
I wrote this story mostly because I couldn't believe that no one else had. Maybe it says more about me than anything else, but the events described here seemed a natural consequence of living in a world where certain fantastical elements are real. The ability of some to, for instance, alter the appearances of their bodies, and the ability of others to, say, drink a potion that would allow them assume the physicality of another person.
This is my first attempt to erotica, so I ask that if you do review, forego leniency. Give me the cold hard truth about my writing, so that whatever I write next will be better.
If your sensitivities are fortified, then please proceed, and more importantly: enjoy.