I understand your point of view, and chances are you are right across the board, from what I understand this is the second game by this author and in the first he had problems with the NTR, so he probably avoids it now.
About the mother, I'm not sure she is simply protective, from what I understand she was the only one present during the MC incident, and never clarified the events leading up to the coma, actually replaying it a second time I had. like the impression that the corruption of the family, or at least of the MC, started with her. Now I will download the new update and see if there are other clues, I admit that I am more attracted to the mystery for now.