Hi!
It will be done, in the future - but it will happen in the patreon, like the previous game.
I am saying Patreon is not the only place people might buy from you. Patreon cracks down a lot on nsfw content with no clear pattern as to what is allowed, both buyers and sellers, so you could be missing a lot of buyers, especially when the characters turn 18. To be clear i know your game is not nsfw yet, i am suggesting a lot of would be buyers where banned from patreon or otherwise had their accounts restricted.
And if you are going to make particularly dark nsfw content when the characters turn 18, especially homosexual dark content you should probably limit it to really high tiers or very trusted people, patreon is inconsistent and what dark content it cracks down on but it seems to crack down considerably more on homosexual content then straight content in my opinion. I don't have much experience with what itchio cracks down on, but the idea of limiting who can get access the content is that patreon is to busy to crack down if no one even reports it and will not even notice it.