darksun
If we're going down that road, might as well mention this:Skyrim with LoversLab mods.
https://wiki.anime-sharing.com/hgames/index.php?title=Jack-o-nine
Jack-o-nine-tails is a slave trainer simulation game. You play as a slave trainer who trains and sells slaves in order to attain wealth and status.
It's got a deep RPG system with magic, interesting world building and lore. It's also absolutely NSFW.
None. It's always "hurr durr, evil bourgeoisie is oppressing poor dindus, do something about that!111" shitlib faggotry.
Even in rare cases when you have an option to be pro-slavery, it's an inferior and suboptimal choice that gets you punished by the game.
You should play Kenshi. Best way to level up your goons is by kidnapping people, locking them up in cages, then repeatedly beating the shit out of them.
Morrowind, with "beast races" (Khajit and Argonians) being slave meterial for the Dark Elves.
I thought it was done quite well, and the "It has no master?" line is quite memorable,
LuckmannYou can own or free a slave in deadfire, and presumably work with the slaver faction.