You play arcology owner in Free Cities (dictator/mayor and slave owner of dystopian city state).
You can use your influence & money to shape Free Cities into future society of your liking, interact with your slaves, upgrade your arcology and more. For simple example, you can make your arcology kind or cruel to slaves, you can make natural or implanted slaves fashionable and so on.
Game is very in depth with many options to choose from, open to different fetishes, sex-orientations, quite a lot events... only thing I find lacking is more "effective" ways of breaking slaves (maybe I missed something) than just keeping them imprisoned until they behave (if someone knows, please PM me).
Free Cities are best text slavery game I tried so far. Game is text only (some pics of girls, but nothing much), but I still highly recommend it to anyone that can read more than three sentences and likes slavery genre.
P.S. I recommend opera or chrome browser for game, as for some reason firefox doesn't load pictures (in my case at least).