I mean, Ava and Dakota are pretty straightforward. You just give them serums when you can, increase their affection and corruption when you can’t, until you can’t give them serums anymore. I believe the updates scheduled for this summer are supposed to add some branching paths, and you’ll have some different scenes with them if you’re in chastity or a sissy, but otherwise there’s not much in the way of guidance necessary.
Giving Ava the strapon or collar from the adult store can also cause some different scenes, but again, those are pretty straightforward as well.