I'm personally not a big fan of even implied NTR. Obviously the main fetish is not NTR but, surprisingly, there are a number of instances of implied NTR in the game, for example, how the MC "cheats" on his master Magatsu-sama with other yokai, which is mentioned by several characters, even beside the kitsune bride thing. It is confusing, especially considering the plot, and is actually my singular gripe I have with the game. I don't know... I've seen shit get tagged here with the Pregnancy tag, even when there is only a single line and/or a single CG that barely implies that it happened,
in a number of cases...
I also generally don't like NTR (it's one of the fetishes that takes away from the fun for me), but I'm willing to suspend some of my dislike in certain cases of Monster Girl RPGs, since in those, plenty of times, the MC does have a main love interest / route, and all the bad ends are, in essence, a form of "cucking" that love interest. For example, in MGQ/P, Luka with Alice, and literally any bad end of Luka with any other girl.
If it helps, that suspension of dislike can be motivated in world / settings in which polygamy is a much more accepted notion. In the example of MGQ/P, while Alice would like still be possessive of Luka, I'm decently sure she wouldn't really mind other monster girls having a round with Luka (especially if it's needed for the quest / during a fight), besides making some sarcastic quips after the fact.
Similarly, Magatsu-sama would understand if Hakunen inadvertently was roped into situations involving other youkai, especially if he had little choice in the matter. For example, while the Kitsune wedding was a bit weird aside from the clear reference to the japanese folklore of Kitsune Weddings, Hakunen didn't have much in the choice of traversing the kitsune area besides "going with the flow" of the situation. Or another example, later on, in the 3rd game, in which he literally needs to learn to take it up the ass to charm a futanari youkai into failing her yin-yang balance mechanic, he has to learn that with his body by being trained by another youkai, but all of this was necessary, otherwise he'd be stuck being defeated by said broken yin-yang balance thingie.
I'm not 100% familiar with games in which the Pregnancy tag was used incorrectly like that, but I'd also be of a mind of not including it there, unless it plays into Pregnancy fetish (such as talking at length about getting pregnant / impregnating somebody; or having sexual activities with an already-pregant person).