Glad my icon got you interested :P Canon-wise, Kanba's feelings on the matter are fairly canon but Himari's are more ambiguous. No one hooks up with their sister in the end, if that's what you're worried about (and there's a bit of a late-series twist regarding that relationship too, though another one kind of takes its place in a sense). It's a very surreal little show and there's some heavy stuff that goes on later. It never goes as far as Utena but it's still very Ikuhara.