I'm a hardcore Anti-NTR and my comment history proves that very well but you guys are insane. No harem girls playing with each other doesn't mean it's not harem. Girl on girl content especially between harem members is not ntr nor it ruins harem. One of the best rated and most supported western harem games has girl on girl content.
https://f95zone.to/sam/latest_alpha/#/cat=games/page=1/tags=173,181,254/sort=likes
You know why? Because man find girl on girl hot. Simple as that. 99% of the times girl on girl used to bridge to ffm threesomes and for pleasure of mc anyways. I haven't see many games where a girl steals your love interest from you. And frankly man doesn't see girls as a threat. You can scream 'Hypocrisy!' all you want it doesn't change anything. I know it's hypocritical but so what? You and couple of people here are only tiny but vocal minority who thinks girl on girl fun between harem members is ntr and ruins harem. Stats speak itself
Btw I talk about in general. I don't say girl on girl cannot be ntr. But it would be in very fringe cases because I haven't see much of those. I think the scene in this game with strap on and behind mc's back was tasteless and ntr-ish indeed I can agree that