And how do I promote this Incest patch? Where should I put it? Because Incest is forbidden on Patreon.
Friend, you can put it here on the site. You don't have to name yourself in it. Just upload it here. You can even make up a name or have someone else take the credit. All that matter is that it's available. Heck, you can give it to the many Incest Patch makers and I'm sure they'd be glad to upload it on your behalf. 95% of the Incest patches are made by the creator themselves (that stat may be higher or lower) so if it makes people happier, I'd say do it
Or you can do what
Drill Sergeant suggested. I'd prefer the patch because YOU can choose how the alternate conversations go and can add extra details to the script as well. Sometimes with selecting relationships the incest feels a bit robotic, where the patch allows you to add a lot more "taboo" dialogue. Stuff like talking about when a kid was born, when they formed their first connection with the character (I.E. When Son/Daughter started to have feelings for Father/Mother) or even contemplate the forbidden nature of the interaction.
I think if you are trying to make a game about proper incest, you have to NEVER let go of the Taboo potion of the genre. If the love isn't forbidden, then it isn't really incest. If there isn't at least some disgust, then their isn't time to properly evolve into a forbidden relationship. A game like 23 Sisters is a game that parodies the idea of Incest and makes it so accepted that it has no taboo at all. That may be a funny game, but it's far from achieving a struggle for the MC to overcome.
Anyway, that's enough from me. Also, when you post the Patch don't forget to put "Unoffical Patch." It didn't come from you after all