Ok...well they wouldn't have to like make out....maybe they could share.....worst case scenario (in my fantasy) is they share mc but not at the same time...problem solved?
Well, if they share but not at the same time, and there is no sexual contact between them, effectively you would not have incest, though you could still have "harem" (though "harem" assumes that the male is kind of in control, while here, I would see more mom and daughter being in control), and I remember the developer was very explicit in the past, being nice to different characters is normal, even flirting can be OK, but it is going to be about monogamous relations, so no sharing.
Guess also because he spent so much time on building up the story and some romantic elements, he does not want to take the risk that the game ends up goign down the beep-fest road
Effectively, to the dismay and even rage (no, I am not exaggerating, seen some comments in the fan art thread) of some, Emma is supposed to be a possible love interest, so for the one asking, yes, something can happen with her at some point (I am myself not at all against it), but keep also in mind that the indication is that would be something different from what could happen with e.g. Lucy or Kayla.
Emma, Lucy and Kayla are not exactly the same
, so can be expected that also the relations (and certain activities ;-)) between them will not be the same way