I'm looking for stories in which the Hero (or one or more of his/her/their party) ends up willingly siding with the demon lord.
It doesn't have to initially be willing but eventually the protag for one reason or another ends up willingly siding the forces of darkness.
In that regard, this...
Most of the novels I see here seem to treat the gender bender aspect (if it's used) as just a thing that's pointed out and fascinated of at the start and then it's largely glossed over afterwards.
Does anyone know of some stories in which the gender bender is utilized as a primary plot point...