Stargazing buddies Suru and Maina
But
What would Suru's and Storia's opinion be on Long-hair Maina (it's just the best way to describe her timeline lmao); extremely arrogant and self-important, Maina used to flaunt the king's status as if it were hers. Maina used to see everyone else as beneath her.....just.........don't ever talk to her about it now or else she might actually die from embarrassment.
I can already imagine Storia arguing with her or getting in passive aggressive fights (not sure how in-character that would be). Maina —no matter at which point in time during the king's reign— would get defensive to varying degrees whenever someone confronts her.
Storia and Maina hmm
Maina noooo. Let Suru braid your hair it'll be better
Suru wouldn't really react much. She's on a tight leash with Crownus and doesn't want to risk consequences if she pulls it too taunt. She has some sway, yes, but every independent action is a risk and akin to walking on a tightrope. She'd rather not risk upsetting the king by telling his sister to be mindful of others, even if she doesn't enjoy Maina's presence, arrogance and self-importance aren't rare types among the nobility, she can... endure the behavior without a negative reaction, basically.
So in public she treats Maina like everyone else, cordial, tells her of the future if Maina asks it, but there's an obvious wall between the two. Just like with everyone else.
In private she's quietly muttering and cursing at her, and everyone else, thought. She softly speaks out her irritation and anger because that's basically the only outlet she has.
Storia is mostly unseen during the years of unrest leading up to rebellion so a confrontation is unlikely. Even then she'd try to avoid confrontation in private, that's something she'd rather do in public, for all to see, to fuel the growing unrest, to make the royal family seem as bad as possible. Of course she'd be angry with anyone who so openly sides with Crownus, but she knows it's better to show people just how the royal family is, rather than tell them, they won't believe a word a liar says, but they can't turn a blind eye to actions as easily. Basically if there were a confrontation, Storia would try to manufacture it, and use it to her own advantage.
Storia is way more willing to go to violence to get certain things done, but even then there's strategy to that violence, so she wouldn't fight Maina, largely because Crownus is basically holding her older sister hostage and she can't risk Suru getting hurt because Storia got into a fight with Maina. I somewhat doubt the king would approve.
The only time they might get physical is if Maina tries to stop her from getting Suru out of the castle after Crownus is dealt with but I doubt Maina would do that.