Aight a lot to take here.
Firstly - My vision for that is that the harem will be mostly Mc's with Mia being in it as well.
Nextly- I dont say "no" to only lesbian scenes with no mc involvement cause my goal is to make the cast diverse and deep and tell a story about all of them.
Also I personally like lesbian content so I will put some scenes like that just because the cast is so hot I wouldn't forgive myself if I didn't use them for all kinds of scenarios, but any scene put into the game will be connected to the main story and will have an impact on it so there won't be any pointless lesbian scenes with no plot relevance.
(Also a friend who checked all of the 20k+ words for miss-spellings and logical errors is a lesbian and I need to pay her for her work somehow

)
(edit - this next sentence is like version 2.0 or smth so it's like years in the future so chill)
(edit made cause some people got mad that the game is not 100% only fullhetero only mc action)
Next up - Yeah I planned a scene where the harem girls get freaky and the MC is tied up and can't do shit but I have a nice story explanation for that and its not like there will be many scenes like that, probably one cause it fits one plot point.
(Also they will untie him at some point so don't worry.)
Okay no more spoilers hehe.
Next - There's no plan to bring mia ex into the game, its just a cheeky line in the bio. If there will be a day where i decide to bring her into the story it will be only as a side character to move the plot forward. No scenes and harem involvement planned.
Next - I plan no incest cause the way the story is set up right now leaves no room for it and i just dont think it fits the plot. Maybe in one update along the way I'll leave some room for someone to do an unofficial patch but that's a thing for way way later. Don't expect it anytime soon.
Lastly - No pregnancy planned at all sorry.