Yeah, step sisters, english is not my first language and forgot the correct term. And exactly, you expressed my exact point of view with better words.
Very understandable, glad I could help.
Just to clarify, the term siscon doesn't have to have incestuous implications. It's also frequently used when a sibling is just a bit too focused/possessive/concerned/protective about their sister~ Miki fangirling over Aki fits that bill, though it's not as obvious as it could've been with a bit more previous screen time
Fair, I'm mostly familiar with the term being associated with the incest implication so that's where my thoughts go.
Well, it is more of a wish than anything else, since no one with a healthy mind would prefer the other option. In any case, Miki's issue with Aki will most likely not be romantic. At least not in a literal sense.
I wouldn't go as far as saying "no one with a healthy mind", it's not the route I want the story to go here, but it's also not something I'm going to say people are unhealthy for enjoying. Especially with this story being fictional, and there's way worse things in media out there.