Well, that was certainly unexpected!
I'm not sure how secret Sage's kinky side is. She's pretty clearly enjoys sex and likes experimenting.
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I think her exclusivity with Chad was more about him than her; he treated her mostly as a trophy, so obviously she would need to be publicly faithful to him. With Chad out of the picture, Sage might be less obsessed with monogomy. I do think Sage is more traditional than her party girl persona lets on; if an MC who wants to be with her for the long term is going to have to commit to an exclusive relationship - mostly. Sage is never going to be okay with her boyfriend screwing around behind her back. But I've said before I could see Sage letting the MC fool around with her and a trusted friend on occasion.
Having said all that, I suspect we are reading more into this picture than is actually there. The HOTs are sorority sisters, so letting a couple of them tease someone's new guy seems very plausible. I doubt it would lead to a full on foursome in Episode 7, but it could lead to a mild lewd scene and would still be plenty of fun. And it might well set the stage for an encore in the future.
That's my $.02 anyway.