Whether they are ok with it or not, come's down to whether they are written to be ok with it.
Obviously, yeah? When I'm talking about what they would want I mean exactly that, the characters the way they are written. They may be freaky and horny and chill about a lot of stuff, but their romance plots are for the most part vanilla and conventional. It's not a suspension of disbelief problem -- not that an unconventional relationship would even require that as it's not something inherently fantastical, it would just have to be written convincingly -- most girls are just not written in a way that makes it seem they would be fine with harem.
example being devoted to Ella, it wouldn't be hard to imagine her letting Emily and Christie be sub bitches to her alpha bitch
I get this is a porn game and all, but Emi and Christie are really not written in way that makes this seem at all possible. Emi's entire arc is about growing a spine, and she even asks MC at some point if he's into Ella, and if he says yes, her response is that she wants to pursue MC nonetheless. Sure, you can read this as 'alongside Ella' but to me it comes off distinctly competitive in the context.
Christie admits to being a 'boyfriend virgin' and very clearly indicates that she views real relationships differently from what she's doing with MC.
And pretty much the same goes for every major romance option except for maybe Liz.
The thing is though the romances exist in their own pocket dimensions so they are already disconnected
This very much feels like a medium limitation rather than a narrative choice. We have several scenes with girls and MC explicitly acknowledging him fucking around and how they may not be okay with this. It's more that all formal relationship stuff is on hold because of the literal ongoing apocalypse. And like I said, I agree that it's likely that harem is the end game, but only because we won't get to explore the relationships beyond that.
