If it was a throwaway why put it in after revamping it? What exactly does it add to the story? She's shown them teasing wach other without that scene.
IIRC it is potentially their first interaction, meeting again after a few years. So it'd add to setting the tone of their relationship.
There's lot of minor shit added in the revamp, and most of it doesn't add anything to the story, but it's simple fluff. Heck, most of any interactions in this game don't add anything crucial to the story. They're just slice of life between friends shooting shit. It didn't stop the author from putting this stuff in. I don't see why this should be any different or some exception simply because the subject is whether MC can hold his liquor.
I assume Nyx had to justify MC having two long ass sexual relationships and used that scene as a shortcut. I doubt she cares what anybody thinks of a mc who goes to spanish class despite speaking spankish.
Why would Nyx have to justify anything in the first place? And how would that work, when there's tons of places in the game which make it clear that no, MC is
not 21?
Also, didn't MC only have one relationship to speak of, with Iris? Not sure which one you mean as the second, if it's Cara/Nikki then it wasn't anywhere near being ass long, the MC only learns about their existence, as well as about their mother, shortly before the wedding is about to take place.