You might be able to squeak past their Trust and Safety team by heavily relying on "that are hard to distinguish" with a disclaimer like "Despite the appearance at the outset of this game, all fictional sexual interactions with the game by the fictional characters are consensual - the reasoning will be expanded upon later within the game."
I don't think that they would buy the disclaimer.
Have to be kept in mind, when you search a solution, that Patreon isn't the real enemy. By themselves they'll not try too hard to enforce their rules ; at least for adult games, I guess that the "no prostitution" rule have a more active tracking. They want to offer the possibility to create for as many persons as possible. Therefore they'll close their eyes until they really have to open them ; when someone report the game.
And if someone report the game, that mean that he wasn't satisfied by the disclaimer, thinking that it goes to far on the none consensual side. This in the same way that they wouldn't buy a "all girls in this game are over 18 even when they don't looks like it" disclaimer, expecting that if someone feel the need to report the game, the girl really don't looks near to be over 18.
As for the initial agreement, I'm not sure that it would be enough. Here again because someone complained. What mean that someone didn't get that it was an agreement, or ended forgetting about it. And those are two valid reasons to consider that the game is breaking the rule, since in both case someone will end seeing it as a kind of apology of none consensual sex.
From my point of view, it can only be done with a clear role play/fetish approach. What mean that during the "sexual play" (in the widest definition of the term) the girl act and is treated as a pure slave, and outside of them, she act and is treated like a normal person. Even if it's just some kind of, "oh my god, it was wonderful today", after session talk.
And this as often as possible. Once you're under Patreon ban hammer, you are guilty by default ; they don't want the payment processors to impose even stricter rules. Therefore, you have to prove that you did nothing wrong, not to explain it.
Oh and also:
If I'm not mistaken, I believe in a few cases, they'll open your account back up if you change/remove violating scenes.
So far, the only times I heard someone was definitively banned, it was because this person refused to comply to the rules, or clearly voluntarily decided to break them again.
As I said, they are doing their best to offer a place where creators can create, whatever they create. Therefore they have to be strict, in order to protect the others creators, but still will let you make an error time to time, as long as it's an innocent error.
In the context of this thread, they could possibly come with an "it's been a while, in game time, that you didn't showed that the girl wasn't just a slave" complain. Come back on what you already did, add one or two "normal girl" scene, and they'll let you go again.
