I'm playing around with some ideas, but I can't really get behind male role switching personally. Even when a girl says she is a switch, she is usually just a brat who likes topping from the bottom and rile the dom up, not a true submissive. I can see the MC take a passive role in some encounters and let the girl do her thing, but he won't submit to let's say a spanking and get off on it. It would be out of character, even as an optional choice.
Regarding choices, there won't be game changers. I am a big fan of Akabur's Witch Trainer when it comes to gameplay, so expect something among those lines. You will get the chance to flavor the events to your liking, or avoid a specific fringe fetish, but there won't be distinct routes for a character that change them fundamentally. According to my current plan at least.
One example would be this: you facefuck a girl, that's a given. But you have the choice to go slow in between to let her get used to it, or to do it so hard that you make her throw up eventually.