[Perhaps someone overheard him earlier, heard his cruel words and thought to change that. To bring Yuuki the person he must share her with... it is both a painful thing and a welcome thing. Kiryuu, after all, has been a good tool in the past, nurtured by Pureblood hand and molded into the ultimate weapon to protect Yuuki. He might have another use, even here.
But Kaname isn't here to antagonize, despite being greeted with such a hateful air that is completely Zero, nor is he here because he chooses to be. He can be agreeable with Zero, perhaps. For the moment, he will let Yuuki have this time to talk with him, stand silently as her watchful 'brother' until he feels like addressing him.]