I like incest too but I think for some folks they like it so much they can't get off to anything that's not incestuous, so they demand it be added to every game. Some NTR fetishists, foot, and beast fetishists are the same way. I respect their taste in porn but they're very loud and annoying.
(Besides, my incest kink is more about emotional relationships than it is about blood or legal relationships. The love of a mother for her child turned into something that also has a carnal element. Far as I'm concerned, Myriam is Marc's mom, and Katherine is Marc's sister, in all the ways that matter. Patreon censors might not consider it incestuous, but I do.)
And yes, Myriam and Anthony are not married, I misspoke earlier. Which makes the entire legal battle over custody of Marc even sillier than it already was, given that he's 18 and has every legal right to decide where he's going to live for himself.