^ man I really hope it doesn't go that way because then it'd just end up being like every other incest story. It would pretty much destroy every bit of meaning and character development these 4 chapters gave.
Not necessarily. Sena admitted her deepest secret and Kiku proves her love by accepting her. And that might be the kick in the pants Sena needs to move on.
As for Yuuna, if the incest be requited, a confession could just be cathartic because they both know how doomed a relationship between them would be. A sort of “I love you but we shouldn’t cuz how would we explain our relationship to our parents and we both found other people we can be happy with.” Doesn’t mean they’d end up together.
Who knows, maybe Kiku confessing to her sis triggers Yuuna’s old feelings for Kiku and that’s why she looks distraught in that one panel. Or this has a poly ending. Still lots of ways this can still go.
I’m rooting mostly for Kiku’s happiness tho! Everyone else’s top of course. But mostly Kiku so Sena, get over your sis and let Kiku love you.