what is the general guidelines to follow to get the routes?
tbh there're no guidelines, and there's only 2 routes, NTR or Lover, for NTR you just talk to the priest and tell her to let go of the barrier and tell that she can get closer to the rival, for Lover keep up the barrier and tell that she need to keep distance with the rival, Lover end is kinda challenging, cuz you need to manage your resource etc, if you can't be bothered with that you can just cheat and keep having intimate relationship with the priest, oh and for NTR you just never kiss her when she goes for the trials, and always give up to corrupt her faster, that's all