So far, MC with multiple girls. Closest we've gotten so far is a dare for one girl to kiss another and a few lesbian dom scenes by a particular girl.
I didn't, but when I did Squid Game from the chapter select, that wasn't necessary--you could choose either. I think it might turn on how you resolve her first quest, since there's dialogue in Squid Game that directly references the Pepelepsi route (or at least there was for me, and I didn't choose that in my main playthrough).
Edit: Thinking about it, I think what we really need (instead of an update to the walkthrough, which would be nice) is a flowchart depicting the various scenes and the major ways they interact. It'd probably be pretty complicated, though.