I think in the final chapter he may give us a choice between...
I don't think this would be the plan, currently at least. It sounds like the dev has things pretty well set in his head (and maybe "on paper" too) as to how things will go. Plus, if there is a choice at the end, not only will it require two different stories and sets of renders from that point on, but it would probably actually need the choice to be quite early in order to work properly. Otherwise, it will feel like some stuff comes out of nowhere (unless we resort to a load of flashbacks, which I feel would spoil the narrative). I don't think there could be a single point where you could say, "from here, we can perfectly branch to a good and a bad ending" without then continuing on for an update's worth of story on each path, because those endings would likely need to be quite different.
Her panic here makes me believe that they had a loving family home before all of this, where her betrayal will destroy everything. She has said herself that she was not the type to betray her husband before this. Maybe Hutch is a decent father and the son actually loves and respects him, so finding out his mother betrayed his father like this she knows he will take Hutch's side.
That's the gist of it, she actually does say words to that effect:
"He's been such a wonderful husband and father..."
But he does know now, and she knows he knows. She also knows she is not carrying for the both of them, if anything Hutch is doing the heavy lifting with the burden.
Loyalty? Honesty?
Loyalty = -4272
Honesty = -843
Seriously no matter how you look at it, regardless if you think she is misguided or manipulated or manipulative, or plain naive. Her actions are disgusting and unbecoming of any spouse in a long loving marriage.
The bit I quoted about Vivian having to carry the burden for Hutch was before she knew for sure that Hutch knew - i.e., before she found out that he'd seen the bathroom sex. She said this in the shower the morning they got home from Christian's. Obviously things changed after that, so as you say, she (now) knows he knows, but it was quoted to show her mindset of trying to keep it from Hutch in order to protect him.
The loyalty/honesty stuff is pointless, because you're just assigning made-up scores in order to make a point. And if you were doing it right, you'd have to include the parts that would add positive scores to the tally too, even if there aren't as many of those.
It should be clear though, people like myself who are putting across our views of why Vivian did what she did, trying to explain what we think was going through her head and how she justifies it to herself, how she was manipulated into it, etc... we are not saying it makes Vivian innocent or good, or her actions justified or forgiveable. It doesn't mean that we think she has done the right thing. It's a terrible thing that she did, no matter how you paint it.
Personally though, I don't think we're anywhere near the point of Vivian being "for the streets". I don't think we've seen anything from her that tells us she's broken the dam, and now she's going to go out and try to get (different) cock wherever she can find it. If this were a real-life story, if Hutch and Vivian were people in your circle of friends, for instance, you probably wouldn't be saying that Vivian is now going to go and fuck that mechanic, or that student - she's having an affair with Christian, and at the moment that's it.
In general, I don't think people who have an affair immediately go out to add to their number. If we're honest, I think the only reason anyone is suggesting that Vivian will now start spreading her legs for everyone, is because this is a porn game, and we've seen it in every other porn game of the same type. From what we've seen so far though, the dev is telling a story through the emotions, expressions, and reactions of the characters as much as through the dialogue and their physical actions. He seems to be keeping things quite well-grounded so far, and to me at least, that suggests he's telling his own story, rather than just writing a story to hit tropes found in other games. As with literally everything else though, we'll have to wait and see...