HopesGaming have you thought of eventually taking Deluca to Steam? I think it would be a huge success. I originally thought that only full games were allowed, but then I saw what Badik did and clearly I don't see why you can't do something like that? You know, dividing the story in parts. The continuation parts could be just "expansions". Of course, first you would have to settle down on gameplay aspects, but I would start looking into requirement and such.
If Sisterly Lust can be on patreon, that even without patch is with no doubt an incest game, I am pretty confident DeLuca would have no trouble.
Just a note: you may need to think about the income process. While many would keep supporting you on patreon, others would just go a pick a the new part from Steam store. Sisterly Lust is a finished product, so everything they get on Steam is on top of what they got from patreon. I don't know how Badik works, having the product both on Steam and being developed through patreon support. Although, given that pretty much everybody can just grab it free here... the whole discussion can be irrelevant.
I still think it is worth taking some time analyzing the alternative.