The potential for polyamory hasn't been discussed much just yet, but I'd be surprised if she isn't eventually open to it. Keep in mind they literally only had sex with each other and opened up about their feelings within the last couple days, so it's still very early for deeper relationship discussions.Do you mean sexually only? What about real relationships? How'd she feel about Jack (sorry, I just went with default name) falling in love with someone else? I mean, I can see her in a throuple with Amber (I think it's been hinted that they have feelings for each other) but I'm not convinced about anyone else.
Amber is the most obvious one to add as a polyamorous partner, but if you initially turned down Moonsong, Evelyn also doesn't seem to mind at all when MC goes on a date with her (in fact, Evelyn saw the date with her vision and comments that she hopes MC enjoys the date as much as she did). And keep in mind that Amber has a huge crush on Moonsong, so I doubt she'd object to Moonsong joining their polycule either.
Also, see my edit I just added to the post you quoted. I'd be surprised if Evelyn hasn't had visions of other people in polyamorous relationships, which could potentially open her up to the idea.
We also know for a fact this is a harem game. So if you use that metaknowledge a bit, I don't see a scenario where she isn't eventually on board if you make the right choices.
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