As much as I agree the Marina games are some of the best in the genre, there's lots of ways in which they could be done better; It's a genre starved of good stories. Kenji definitely treads too far into the path of surrendering control. He sends his wife away with little apprehension, and in the last game especially this stuff is turned up to 11 and it's borderline NTR. Extra iffy when you consider they have a child in the mix. While some of these things are simply down to preference, and it's totally fine to agree to disagree, I feel like a more hands-on, above board, vanilla approach like in this game makes for better stories that best cater to the fetish's strengths. Pure NTS means the wife is doing it entirely selflessly for him. And it can be hard to really get that sense if he's not there to witness it, or lets his imagination run wild with more NTR thoughts. There's still space to have scenes where he's not present later and play with that, but I think the best decision is to have him there in the key story moments.