I really really don't want to have this argument but its pretty widely accepted that it doesn't need to be someone actually in a relationship with the MC, merely a love interest is more than enough. Its pretty common in the generic "My childhood friend was stolen" stories that are all tagged NTR. Some guy fails to confess his love for his friend/crush and another guy swoops in and apparently according to most of those hentai writers, its first come first served with women so lol......NTR (netorare) is specifically cheating, a woman in a relationship with MC going for someone else. There's one scene in the game that I would say fits that criteria(MariaxEnrique) . If you mean voyeur scenes, MC just watching girls have sex with other people, then yeah. There is a lot of that in the game. About half the scenes in the game are voyeuristic.
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Again, not going to argue it so feel free not to explain any further....