Man, I see NTR as a more comprehensive issue, like the MC may not be interested in his mother, but she is a person he loves and wants to protect and the antagonist wants to corrupt and degrade the MC's loved ones. I never complained about other characters because they weren't important to the MC, but the mother is another story, doesn't always need to be a sexual relationship or a romantic relationship, but any important person in the MC's life is what I consider NTR, let's think along this path, your mother who is married to your father and you love you mom is kidnapped by someone and corrupted to become a sexual object or someting else, you wouldn't be mad about that? or you'd be fine with them doing that to your mother? NTR was very condensed into a single style where the MC's love interest is stolen, but I think the term NTR should be more comprehensive and add family members as well, like you may not be romantically interested in a loved one but you love that person and don't want that this happens to her. I know it's just a game, but you start to have an attachment to the characters you play with over time that what hepen to me i don't nw if you is the same or any other.