This game is very interesting!
However, I am not very good at English, so sometimes I cannot understand the details even when using the automatic translation function.
Is there a wiki or something similar somewhere?
If you want to increase affection you would have to send them out to prostitute themself then catch up with them to build that up.
Because the NPC interaction system and the NPC slavery system don't really interact.
Or are you wanting to increase your slaves love for you? Then you just need to reassure them.