check out COM3D2
it has NTR content too
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Sure it has NTR, but it's very specific NTR.
1: First of all you have to LET her do it, because you give her the NTR-related action in time-slot (which makes it more netorase).
2: You have to take the virginity of at least 2 of the girls to start the ntr (so no pure girl get's corrupted by rival).
3: You can only get NTR-scenes with the 3 starting girls (at least the times I played) which makes all the other girls "immune" to NTR.
4: The girls will like the rival more, yes, but they will not leave you, so they are just loyal working maids, who likes to get fucked more by others...
5: The choice of "personal" or "public" maid is something I also don't...like. That could have been the perfect option to activate/deactivate the NTR for every girl, but it just is for the "whore her out" (meaning: she can do the "sex" jobs but you don't care about her getting fucked, and if you choose to watch, at least I, never saw them having "sex") option...
So overall I would say: the mass of customizations for the girls, and the scenario itself are fun, and would give you a hell of NTR if done right, but for me it feels just like the devs wanted to throw some NTR inside to get us (the NTR-fans) interested to get some more potential buyers. I may have missed some NTR content because of the new dlc's/updates but I think there will be no change to the system (aka choose for her to do it) so it's just some more scenes to watch, but which have no game-relveant meaning (like: the girl will leave the house or skip work for getting fucked by the rival).