Yeah this. This right here is my biggest concern. The cheating aspect always makes for the hottest NTR games.1-the fact that the cuckold finds out early, and it's an open relationship game. i prefer cheating.
For me it's not so much that Hutch knows, it's the fact that Vivian knows that Hutch knows this early on. Maybe the direction the dev is going before Vivian goes full slut mode is have Vivian downplay the favors she does for Christian. Just because Hutch greenlighted her behaviour doesnt mean she cant keep things hidden from Hutch. Maybe at first she tells Hutch everything but as the game goes on she starts to hide certain details from her "work" with Christian. That way she is cheating in a open relationship since she betrayed her husband's trust despite his giving her a second chance
On a side note, Christian doesnt strike me as the type of guy to pimp his girls out to clients. I thought he was always about keeping the girl to himself. I think the dev has some explanation to do before the inevitable pimping out.