What does it say about the wide range of popslash that all the gender-swapping and Mpreg and morphing into animals and cloning and so on don’t count as fantasy AUs? Anyway, for this day I’m offering a Lance/JC story I’ve read more than a few times:
Slave to Love by CrimsonQuills (also known as Nix). In this fiction JC is a frightened, older pleasure slave being auctioned in the market when he’s purchased by Lance. Lance has had a dream and is searching for the man who will become his mate. JC has doubts, as he’s always serviced women before, but Lance is unexpectedly gentle and careful with him. The story spends a lot of time with Lance letting JC get used to him and comfortable with their physical relationship. I know, slave fics can be harsh and awful, but this one isn’t.