I generally don't complain about what devs decide to do...but, I have to make an exception in this case. You are talented devs and you have created a great female and a fairly decent relationship between the Girlfriend (name of the game) and her boyfriend. You are talented but have lost focus. Focus, is what all good stories have in common (within the porn genre and outside the porn genre). Focus is what allows others to enjoy those stories. Too many ideas and too many characters have made this one difficult to care about. This is simply my opinion.
I played two other games by the developer. In my opinion, adding more and more characters and storylines hurt the game's main focus in each case until they were finally abandoned/suspended after losing coherence and becoming confusing. In Girlfriend, there are so many cuckold/corruption/cheating/sharing options available to the MC-couple at this point (before the latest update) without adding more characters who take 'game space' away from the dynamics between the two MCs and their transgressive games and relationships with existing characters. For instance, the involvement of Brian's wife has many NTR possibilities. Still, it has yet to be exploited fully, not only with the MMC but as a vehicle for revenge for the FMC on the philandering and dishonest husband. I say this as a fan of the developer(s) who enjoyed their prior efforts, but I would hate to see this VN end like the other efforts. However, they are the ship's captains and can proceed with their vision for Girlfriend. I respect that, but I thought I would just give my input. In my experience with NTR-type games, there are too many abandoned games with loyal followers, most with great beginnings and promise (with enticing, unforgettable, and sexy FCs), but eventually leaving a loyal following with multiple 'what ifs' after playing many, many hours on multiple paths only to end up frustrated and angry campers when the developer disappears, and the game is abandoned mid-way in the story.