Well im using a female mc so thing's that come to mind are are things like feet for example or more bdsm play for kinks or more Oral like we van give them oral as a reward if they do a good job in Training
As for copper maybe some things like small merc missions nothing massive maybe a run away slave and your tasked at finding them or maybe some form of protection for a noble or trader we have mercs so gives them more than one use,
could also use slaves in other missions like work as a cleaner or cook for another fort and if they do a bad job can use more bdsm punishments like leaving them tied to a pole to be used by whoever is in your fort at the time?