There isn't one, gooeyadodo, Nero2377, Seiisuke, and Raygha didn't read the text for the scene, and missed the fact that the werewolf in question is in fact the MC. Cheating on the MC with the MC is the simplest wording of the scenario in question.
That might be were we have a difference of stance in gaming view, for me it would have to be uninterruptable to begin to classify has ntr. actually I tend to get too irritable with terms being misused. For one has a technicality it require a fat ugly old guy for it to be ntr. If the antagonistic party is not at least two the those it would be cucking. Also has you have pointed out you can interrupt.
The basis for this is general meaning for the word ntr is an abbreviation of means the worst of the worst. While some may view interruptible scenes and take her for yourself scenes has ntr they actually have their own classification and I view it has insecure whining given the amount of times I have seen similar arguments for games with even less ground. I remember a game/visual novel mix from a few years back where people were whining about ntr, the situation being a scene in which the Mc's gf gets drunk at a party and a rival of some nature (I forgot what exactly) begins to grope her. The fact is the scene doesn't give you an option to let him and the MC promptly beat the snot out of said rival. NO sex no loss of clothes and yet in the comments people bitching about it being an ntr scene. Can you can see my frustration with people crying about ntr with little to no ground to call it has such and the ability to interrupt/avert a scene.
Also the the catgirl will only have sex with the monsters you make her.
Finally the last reason this seems like a pointless claim, is the originally being to add ntr has a tag... which would mean it's a primary genre, or a prevalent feature in the game... It is neither, it happens only if you make it and in one scene so far that is doubtful if it can be called an ntr scene. Make what you will of this, but I doubt the creator of the game even remembers this page exists has that last few builds have been by going to the Patreon account of the devs and getting it from there... Making this entire thread pointless, if that's the case has the game page simply won't receive further updates.
I could actually go into a major criticism of the ntr game genre, but that would be for another time.