I wouldn't look at this scene so deeply. The main reason for this scene is to create a prerequisite for further threesome sex scenes with Sage.( with Heather, Sara and other friends of Sage). This is the first full-fledged threesome scene involving LI. In fact, after the scene, Sage behaves almost like a his girlfriend. She says she liked watching MC fuck another girl (why would she say that?). And at the end of the episode, during a walk with MC Sage bluntly says that they are not dating yet, which means it was just the usual spontaneous drunken sex of three friends.
But my whole point is that in the preceding episode DPC went out of his way to make the MC object to Sage treating him as
just a chance for spontaneous sex. Yet here he's suddenly willing to initiate a meaningless threesome with her and Quinn, even though in a couple scenes he'll be right back to insisting on a real relationship with her (assuming he picks her at the crossroads, obviously). That's not a character arc, that's a haystack.
The fact this is the first full-fledged threesome with an LI is all the more reason it should have been handled properly, not sloppily implemented just to keep up the titty count. Much like almost everything else supposedly leading up to that blasted crossroads, I like the idea but hate the execution.
What is the name of your MC ?
I went with Evan for my main. For my alts: Ace, Leroy, Jean, Tim, Romio, Cam, Ferdinand, Westly, and Quintus.