I..don't think it's Kuroneko having a conversation with Kirino, it's actully her talking with Kyousuke in person <- This I infere from the japanese equivalent for quotes, the " 「」" signs.
Basically is Ruri herself giving green light to Kyo with her or Kirino, whatever makes him happy....it seems....I don't know how to feel about this...I don't want Ruri downgraded to a sex-friend T_T even if sex never happens (I belong to KN faction after all).
My jap is too limited so Sumeragi, or someone that can actually read the suff,please tell me i miss read that part... .__.