I haven't really got any goal here apart from not bimbofying Zoe or Ayneris after they've consented to sex (or sticking them in jail as their obedience low.)
That consent fix seems promising. Thematically, the master should be able to seduce the girls with potions and stuff even if they are not obedient (yet). Ideally though, girls who have consented on a previous occassion should be able to resist on future occassions in bad circumstances, but it should still be consistent between the sex+meet interactions and there are other factors like lust that should be taken into account. Too complex to just tamper with.