well i thought on it some more and i had a few random encounter/quest ideas (granted they are all kinda small)
Firstly a damsel in distress quest. After taking out the red tiger gang maybe you free their one singular shared whore? (set of whores? twins?)
Second is based on the religion mechanic..... maybe making exclusive girls that can only be acquired through devotion to a group/ideal.
Third idea. Special interactions that happen between slaves when they are with particular slaves. maybe even ones that are determined by some of their stats as well. (for example i make most of my slaves be teachers at the academy why not have small talk related to work there?)
Fourth investing in nikola for profit or just free repairs/piercings.
how about gi outfits? (themed for the martial arts group)
Last one....how about the martial arts school becoming its own faction.