id also suggest giving the enemys roles and having their respawns limited
you could also give kill or fuck mechnics seeing its a nsfw game
the plus to killing enemys is that a medic cant revive them
but using the nsfw nature of the game sex heals our girls and in turn means not killing but tying their hands for later use and even allowing the players to use heavy girls aka strong girls or giant ladys to drag/carry bodys
also to balance out abit a heal requires a orgasm and it takes time
this timer could be based on a few things
skill for one if their good at sex like sucubi
desire how much they want it having sex to many times might make a breeding take much longer
sensitivity this could be increase by falling prey to the enemys maybe they know how to make people more sensitive this is meant to tire their captee's so this becomes a balance of being taken captive while also using sex to heal your party
along side they could craft up stuff and even find basic medical herbs
sorry if this is abit much i just form ideas in my head that match what i dream of in a game then go off and give all those ideas to a dev