I'll try and be constructive, but feel I must admit that despite loving NTR and cuckolding in general, I didn't like this. And I think the main reason I didn't like it was the lack of agency on the husband's part. As the wife says, she is turned off by him being a pussy, but strangely her solution to this is to make him more of a pussy. Secondly, the wife is really unsympathetic. She has denied her husband sex for 5 years and claims it is his fault for not being more assertive!
I realise the dev is not going to remake this to consider my objections. However, I personally would have allowed the husband more agency by giving him the option to leave the changing room and shut the door, or at least close the door behind him if he stays inside; to object to his wife blowing other men; and to turn down the sexual advances of the friend. I don't think him being unwilling should be the cannonical choice, but it needs to be an option to allow him to maintain the reader's sympathy.
Also, they need to make the wife much more sympathetic. To be honest I am not sure how to do that because at the moment she seems like a total bitch. Giving agency to the husband may help a little because it makes her less of the main character. Or maybe she just needs a good reason for being a bitch (the secret perhaps?).
Anyway, I will still play the next few releases to see how it goes, but at the moment it leaves a sour taste in the mouth.