Depending on which part of the walkthrough you read, a later relationship with Mira's mother, after the church, is supposedly not possible. Elsewhere is exactly the opposite. I've tried it, with different choices. In fact: it is possible. However, if you develop the relationship with Mira's mother later, you will never be caught in bed with her by Frisha. So the 3some scenes with Emily and Frisha does not happen in this constellation so far. So if you want to see this scenes, you have to begin a romantic relationship with Emily beforehand.
I have the impression that various things in WT are simply not up-to-date anymore. In addition, in some places it is written in a confusing manner and even double-edged, so that I have the impression that the original author at some point simply lost the overview himself. There is also the fact that the developer has bigger plans and, depending on the constellation, incorporates further different outcomes of the stories. At least that's how it is announced in the WT.
So, the Frisha/Emily/Mira routes, which are already very well connected, will be further expanded. This is already a nightmare for anyone trying to do their own walkthrough, like me