You know I was never into genderswap/change as a kink. I find it a significant turn off actually.
I found this story on another site and started reading and by the time I realized that's what the porn of this was I was already quite invested in the story, and read all the rest of it.
In many ways this is actually makes for a much better story than the small amounts of erotica within. I would reccomend

Base +14, Ecrofa +6