I want to point out that, while I like this sort of content, it may be too kinky for the devs. In this case, please be aware that Asami suggesting the hookup between MC and Sayuri does not need to imply a threesome. You can have one without the other.
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Well, a Threesome is, at its base, just an accord to have sex between three people, but how kinky it gets depends solely on the implicated parts. It could just be that they take turns, or it could imply doing it the three at the same time (without contact between the same-sex partners), or it could also be about them all having a small orgy together (implying bisexuality and incest in this case, which I agree would be kinky but I'm not sure if "too kinky" considering what other stuff there already is in the game). You can even go the extra length and have a Threesome combined with BDSM elements, the level of kinkiness is very variable and I'm sure the devs could find one that they feel comfortable with.
That being said, I also agree that, while the idea of a Threesome is very appealing for a majority of people, it could very well not lead to it and instead just lead to a hook up, a "lending" so to speak (or "sharing", if the former word sounds too kinky), something which we already have in the game so it wouldn't be too unrealistic.
BUT, just to be clear about something, I don't think this devs are planning to keep game purely vanilla forever. In their message, it seemed more like they were open and interested in knowing what our kinks are, so don't lose hope my friend.
You might be right. I have no problem with the incest scenario (on the contrary) and it seems many others think the same. I still wanted to point out this could be Asamis idea without any of that.
Im also not just gonna rattle off kinks. Requesting stuff others aren't into has a tendency to devolve into a flame war, from my experience. And while the game is reasonably vanilla right now, I don't mind that either.
That said I have seen a few games out there proudly proclaiming "no close relations" in their description. Yet containing a mother-like and sister-like figure for the MC with custom definable relationship types. Eg a default of "landlord" which a player could change to eg "mother" anyway. This made me think there might be reasons for devs to stay away from or hide incest content.
The reason is very simple actually. Patreon doesn't allow for creators to develop games with incest in them, so they have to hide it. I'm not sure if Steam also has issues with that, but usually the situation is that a Dev can only rely on Patreon or Subscribestar (or similars) for stable income so they need to go out of their way to comply with their unreasonable requests