>>11378360
>would give her some other use fitting for her lowered station
For something like that you could have maids and other personal servants be "failed" daughters(and other slaves).
Didn't make it in the harem but still kept arround and useful for master.
Class dynamics could offer a 3rd path, these women sold off to the middle class, here their lowered status still puts them above others as a trophy bitch.

>>11378396
>What about the primary and secondary sectors?
Concept of Class/caste system was brought up before, something like >>11376922
All female sub-race of women designed with lower intelligence, stronger bodies but still fuckable in their own cute way.
Resource extraction and processing is aided by machinery and technology.
Tasks that required the human touch are staffed by these women with their male master as overseers.

>>11378550
>Magical girls
There's always the trope of their magic being powered by strong emotions.
Could easily pervert that by turning them into devoted and loving slaves, gaining power by being daddy's pets.
Sadomasochism could be an option too, though not my personal pick.