I am not the creator. But have asked similar questions, and thought that maybe I can give answer what I have gathered about it.
There will be 4 different endings, depending on how 'corrupt' Sana is:
Wholesome
Somewhat wholesome
Bad ending
Very, very bad ending
So in order to get the 'wholesome' scene, you need to do your best and avoid all sex scenes and 'pretend' it doesn't happen when you can.
And Fief (the crocodile lady) is pretty essential. The choice here is to ignore at the tavern scene.
I hope it helped somewhat.
( But I guess i didn't).