I'm looking forward to the rework too, and will probably hold off on playing more until it's done. Not that I know much about it. I'm pretty new to the game and haven't followed the news from the Dev.
I think Mason is super cute, but aside from being faithful to Nicki, I just can't bring myself to take advantage of him. He is in such an extremely vulnerable situation I just can't do it, even if he would actually be honestly willing, and not just trying to pay the only way he knows or can, for our help to stay safe. For all he knows, we could just fuck him, get him pregnant and throw him out on the street again. At least in this playthrough, I'll just be his protector. If the situation changed somehow, and Nicki was ok with it, well... That said, I love throuples.
I really hope I'm wrong about my fears about Cassie, but it is something NeonGhosts might do I think. I haven't played enough to really have any grounded opinions or guesses. I may play a little dark path, with one eye closed at some point. Perhaps. Probably not.