Considering the amount of different possibilities that this game already have, I imagine the progression with a lot of different possible events, like sharing the mommy, NTR, gay, group sex or bisex. Even if I'm not into some of those the game would be epic
sharing with who?
That's a good question. Seeing as Lisa still loves MCs father I'm not sure she will open up sexually to more people than MC, who is comforting her. I hoped and thought about the possibility of Suzy joining the comforting, but that would be against Patreon's TOS, since they are mother and daughter. I'd certainly wish her to get more comforting until the father comes back, just not sure who would be likely candidates.
About what
Shake 'n Squeeze mentioned, gay/bisexual and group sex have already be confirmed in the planned tags, as has sharing/swinging, I don't see any NTR on the horizon though. That would mean MC is getting cheated on, respectively cucked against his will
to create jealousy. Seeing as everything in this game has been very consensual and the characters have been quite open about their feelings and sexuality, I don't think there'll be any bad surprises.
What I do see is consensual (and probably optional) sharing on many of the characters' routes. Also I think Mr. McGee might be a willing cuckold, who enjoys Mrs. McGee getting railed by a young student. Maybe he even joins the action. Who knows.
What I don't see is anyone telling MC they won't have sex with anyone but him, but then doing so nonetheless. They'd be open about it upfront and give MC options.