For
that scene I guess Kirino's was too shocked to really react immediately, but honestly, it didn't look like Kirino hated it at all, after all, Kyosuke certainly didn't. Their denial was a little too loud too.
Also, I think Kirino didn't want her friends meeting Kyosuke because of jealousy more than not. From her overbearing attitude toward him for the visit, to her gettinig fairly annoyed by Ayase's friendly overture to Kyosuke, and Ayase saying how she's just selfish, it's like she doesn't want Kyosuke getting attracted to her friends and vice versa (who are models after all), rather than simply having an embarrassing brother.
Of course, I'm sure this was all obvious to the wincest shippers
And tsundere Kuroneko without her black coat on..... so cute....