Pretty clear that it was the original intent, with the remnant comments, but Patreon went to war with that subject. I didn't play the initial release, though, so can't be sure. I only play this with the patch, as I really hate the whole "landlady/tenant" thing where it obviously is supposed to be a familial relationship. This game, particularly, is one that makes less sense without the parent/sibling thing. I don't prioritize the Jessica relationship, and flirting with Tiff has been fun and unserious so far.
It's not about the incest to me. I use the patch because the game just makes more sense with it.