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I feel like Sua's sisters also impacted how Sua see a family dynamic ngl. Anyhow, my take on IvanSua Siblingism:
Ivan will always care more about Sua than she ever will for him, but it's a bit complicated and a lot of it is just vibes coming from my own perspective with my disconnect between me and my older brother
I imagine sometimes she reflects how her own big sister acted to her with Ivan, as his own — sort one-sided but technically not really — big sister. It's not as warm or biting
Ivan tends to devalue how much he matters to people, to be an all watching onlooker like his eyes. He has some words about Sua willingly going to sacrifice herself even knowing it would traumatize Mizi, especially since he envies how their love is fullt requited and so tender [Also a smidge of him not wanting her to DIE]. But he wishes he was nicer to her before she died
It's just a messy unspoken relationship, to be acquainted with someone so far away from you yet sometimes you see them step their toes unto being familiar with you is appalling and well a target for caution. Plus she don't like how he speaks to her and how he's highkey kinda annoying too
The idea of siblings and family to Sua is so dullied due her sister's bullying her. So her having that kind of relationship with Ivan is so impossible and a all consuming tide that is left unattended due to their personalities and how they were brought up
The only semi-cute hc I have is if Ivan stopped bothering her for a while she'd at first be relieved but eventually feel like something is very missing and wrong. When Ivan returns to his normal antics she'd sigh both a sigh of relief and "here we go again" wondering why the hell she was bothered by it at all for that short moment of peace
I might add more to this but this is all I can say about it until I can figure out, since they kinda sit next to eachother and most of the turmoil of their relationship is going on their minds