>>11323572
Ways you can do this are:
>something equivalent to the 11+ exam which decided which school you went to a good school or not
>the privilege of emancipation is something that has to be bought. to test that you have the means and drive of independence, richer households can afford it, poorer ones can get it covered by a richer sponsor in exchange for service (yes i know that undermines the test of earning independence, but it's more important to keep the rich with a supply of young slaves, and the poor to keep breeding a workforce)
otherwise if it has to be immutable then it can be done on race

>>11322523
>corruption and training
Still sound too human like, needs to be something colder like domestication, breaking in, or something

As for the "abuse" the only free people it would impress are horny/sadists/both but the fear for the slave is special and hard to describe