Just gonna throw this out there because...why the hell not? Wild theories and speculations are what we do around here.
Perhaps this isn't a game of DnG, but a dream sequence of the MC's that will open up ep 6. The 3 LIs here are the ones that have been the most "forced" upon the players and the ones whose romantic relationships progressed the furthest seeing as how you didn't have much choice to not progress with them. So perhaps this is a dream that will respresent some sort of inner conflict/resolution of the MC regarding these 3 and the setting of the dream is the DnG world.
The reason why I'm not so sure of it being an actual game is because it's difficult to see how these characters - Jill, Josy, Maya, the MC, and the Nerds - would end up interacting with each other, especially if the MC isn't in a relationship with M&J. I suppose they could all happen to be in the library at the same time, but it feels a bit unlikely at the moment.
Also, if it's a dream, we could get a pretty nice orgy, Sally included, that we won't otherwise get in the game's real world.