We talked about it and my understanding as the coder was, that I implement both the "skip scene" choice and an option to block certain option that would lead to NTR/sharing/kinkX. That selection will be introduced in the tutorial and can be changed in the in-game settings (the settings for the playthrough, not the global settings).
As I'm writing, this message pops up
Elf-girl
Aelrue
Back to the NTR stuff: Yes, if those A/B paths are available, the "block NTR" option, would remove B-Path choices from popping up.
It is important to understand, and this wasn't really clearly shown in Runaway Princess, that this is a harem game, but there is no canon path that would lead to an "all LI in the harem" ending. There will be solo endings, touple and throuple and perhapse some more, but the end scenarios I know of never are all-inclusive.
One might call it "cards played right/wrong" but Elly might not be a lover or wife at the end. Same might be true for Kelly or Aelrue. There are some revelations that will come up that will make certain combinations of LI almost impossible, but more about that would probably spoil the story.
There's a balance one has to strike between how much the player pushes their LI into perversion/corruption and how loving they are. On my first play, corrupting the girls was pretty easy... But that might not be the best idea. If you leave someone behind you want to have for yourself, you might not want to have them running around like a pervert all day (e.g. have them not corrupted too much). That's an invitation for a disaster (depending on if you want some NTR/sharing or not).
We have a dev call next weekend and I will clarify this then and update here if my statement was incorrect.
Edit 1:
On that note of leaving behind: You will pretty much be able to bring with you all girls you can invite to the party in Runaway Princess. They won't necessarily be available for combat or other minigames, but see it as a little convoy of girls with a fighting group to protect them on the trip. This will prevent the player from having to replay the games half a dozen times to get all interactions between not just the girls and MC but also between the girls. There are other reasons for it, like having the girls story arc and finals make sense, but I think for the player it is nice to have all content of an update available without having to resort to savegame catalogueing for multiple routes and party setups.