At some point, if I wanted the story to move forward, I would have to include the MC. A lot of people are asking for him to have fun with other girls, and it would be quite hard to do it without showing him a bit.
Maybe there's a way of having your cake and eating it, ie either showing/involving the MC or not showing/involving him depending on the player's choice (although this would surely make these scenes more challenging on the writing side).
Stream of consciousness here, so please bear with me...
Let's imagine that the three-girl harem becomes a reality. They could of course (and SHOULD, as this is the premise of the story, after all) all cuck the MC, either on their own (different female points of view + greater variety of pictures) or together (sharing a bull, etc.). But this could also lead to the following scenario:
The harem has a 4-way chat. One of the girls (probably Laura) is away for a couple of days, and Tara uses their chat to tell her how Ashley cucked HER by fucking the MC (with pictures, ofc; Tara watching and narrating). This would still be NTS, although it would change the focus (but then, there's nothing that says that Laura can't both be a hotwife and a cuckquean depending on her mood--same with Ashley). Of course, the players on the sub route probably wouldn't want that, but there could be a possibility to work around this (this is the challenging part I was talking about, though):
The player would have to name the MC for that. And then, before such a scene comes up, the player would choose the name of the male partner in the scene--either them (dom or balanced routes) or somebody else (any route; can be Nathan, Oliver, or a bull of their own choosing). As long as you don't see the face of the man, this could work (although the player's lines--and some of the girls' lines--would have to be quite different depending on whether the player is taking part in the action or not, ofc).
Note that such a 4-way chat could open many more possibilities, such as, when either Ashley or Laura is away for whatever reason, the other could be with a bull with both Tara and the MC watching (still NTS, still using the phone, but this time, the MC is also present). Tara could probably spice things up (when she gets more assertive, ofc) by jerking off the MC at the same time, probably ruining him (at Laura's/Ashley's request?) on the sub route (denying him on very sub/letting him come in her hand on balanced/on her tits or face on dom?), etc.
Anyway, these are just some ideas. Keep up the great work and thanks for engaging with the community!