It's all good and perhaps in my original post I came on too strong and made it appear I was diametrically opposed to the game, that is definitely not the case.
The only game I can think of that has dialog toggle is Genex Love, where it lets you change your relationship status and clarify whether or not you are blood related (and dialog changes based on blood relation toggle). But you are correct that is the exception, almost all AVN use Roommate / Landlady as a mere legal work around.
Regardless I appreciate your clarification on Itch / Patreon's legal terms regarding incest. That was something I was not aware of.