I can't see the NTR on this game , Sophie is Marcus girlfriend so whenever MC see her with Marcus is not NTR . His Mom see her as a son and he see her mom as a mom , so no special relationship either and still it's not NTR whether the player allow Mom to date Lucas or not . It is NTR if MC & Mom are into a sexual relationship already then suddenly decided to stop what they are doing and decided to date somebody else. Maybe in the later version there will be a real NTR , but In the current version, more on voyeurism only and player as a spectator 3rd person (Mom's storytelling) if you choose to eavesdrop
BTW I'm so glad that Mom's scene is in the 3rd person POV but the problem is her partner is an asshole . I prefer a much better guy if not MC