"I really like the kink so that's mainly for me, I'd really like something where she doesn't know he knows.", that one is too far from the storyline, so it won't be Zoe.
It's not like I wanted to be part of this topic and stir up another arguing because of this, but knowing Zoe's current story, I neither see too many obstacles to such (ntr) scenes being included in the game. Just make your fantasy soar, and believe me, you don't even have to be creative to come up with such a story. lol If someone talks about ntr, everyone thinks of the breakup and the hatred, but this false reality is just a product of the anti-ntr people on this site. This topic can be approached in a different way.
Here's just a quick example that might even fit into the game:
An old friend of yours is moving back to the town, and he decides to call you to ask if he can visit you and Zoe. If you say yes, the NTR part of the game can begin, BUT it is not necessary for everything to happen right away. Your friend's visiting can be regular, and his relationship with Zoe gradual, but it must be obvious from the first moment that he wants her, and he will be the one who take the first steps towards zoe.
During the story, then we can watch them as they flirting and getting closer and closer to each other. Then later, when we jumped some levels we can catch them as they secretly play with each other's feet under the table in the middle of a card party. Then, at on even higher level, you may have the option to leaving them alone by going to sleep or leaving your home with an invented reason. What comes next I leave it to everyone's imagination.
The point is that what happens between them is just a running adventure here, and it won't leads you any break up or game over.
The possibilities are endless. I just gave an example that I came up with the moment while I was writing this. I'm not trying to force anything into the game, I was just refuting your claim that these kind of events and opportunities are far from Zoe's story.
I'd like only one thing yet. If later you still decide to include ntr content in the game, I don't feel like it should be interracial.. It didn't fit the game at all so far, and this kink won't match Zoe's personality later on either.
Overall, I hope you will change your mind one day, and you tuning into the topic.