Well for incest for instance you can have custom naming and relationships input at the intro.
This is (default Blah):
She is your (default Landlady):
This is (default Dead man walking):
He is your (default Landlord - don't worry he will be dead soon!):
Oh we can't MC, society would never accept the love of a Landlady and Tenant!(default name script being completely retarded but Patreon can do absolutely nothing about it)
But seeing as your Landlord had that unfortunate accident falling feet first into an industrial blender and that fact that he was a terrible lover and less of a man than you were at 5.....
Or sometimes there is a patch.rpy which is just blank and you look for the existance of the filename and give alternate script if there(you can write a non retarded default script, but if Patreon ever start really looking into things by decompiling scripts there could be problems, but hasn't happened yet AFAIK).