Well I went for the more obvious ones first. I'm much less certain of it but I suspect we'll get another Mel or Sarah choice. Or possibly we will be railroaded to the one we didn't choose in ep 11. Or it'll be a threesome.
I think Maya and Josy get their ILY path scenes and a throuple scene if you try to keep the balance. That is you don't say that you love whichever you go on a date with and sleep with the other at Bella's.
Sage will have a scene for both her vanilla and kinky paths or at least a scene with variants for each path, but I'd expect another HOT threesome. Possibly with Heather, though I'd still expect Heather to get her Others path solo scene.
What I hope for but don't really expect in ep 12 is a Sage/Jill threesome. I'm also expecting there to be a Bella/Jill threesome but I don't think those would happen in the same episode. It'd be way too awesome. Which is why we might get one of them in ep 12. If they were both in ep 13, then that ep would be too awesome.
Another less likely possibility is a Jade angry sex scene if you showed the Hell Week video to the DIKs. If that were available on Sage's path after switching to Zoey, it would be the ultimate burning world scene. Probably not in ep 12, though. If ever.
Kylie is also an angry sex possibility, but probably not in ep 12.