that's because of how it looks to them from their pov if not considered confusing otherwise, the way how they were going along with the game, not only does it has breeding (which is the whole point of this game) but it has also relationship building from the looks of it? at that point the game itself is not only just about breeding anymore the way how it's going from that direction and i bet no one would even need to bother explaining this to another person about what defines a "relationship" just like that rika x wolfman part, but imagine yourself in that situation only to find your partner doing something that you didn't like to (like super secretive and doing it behind MC's back)
but regardless of it whether it is "you" or "anyone" who doesn't think it is considered cuckhold or should i even bother to say that it's "cheating" to the consent that you as the other partner doesn't know about this going on behind your back in that scenario? tbh i would've agree that ntr should've been removed only "if" this confuses everybody or causes everybody to hate it because of what i've described, probably for me the punchline for rika's development didn't sit right at all, her story though... i have nothing to say about it as i'm also frustrated about those things i've mentioned just now
You must be registered to see the links
feel free to scroll down and read
You must be registered to see the links
's comment, it adds up to my behalf of this explanation so i don't need to further elaborate on this matter, but overall the developer shouldn't have gone with that approach in the first place, if they wanted to, they could've just excluded MC's relationship with rika making it not possible to have a relationship with at the beginning, but like you said before this game is called "breeding farm" but it makes no sense since you're able to have relationships with the girls there, including cece (or cecilia when they renamed her) but other than that i don't even see any reason why they shouldn't remove ntr anyway, this should've been made clear that this should've been a breeding game only with no any dating or relationships whatsoever