Kirino as you all said, is indeed a selfish girl that is getting the stress on her directed at her brother, and of course she doesn't understand people's feelings for others (even if she had Ayase, and that other girl I don't know
) or that's probably the reverse, and she does know "some" type of people's emotions in situations. But she has always been carefree to do anything she wants with no consequences because she has Kyousuke to guard her back.
Ever since Episode 3, Kirino can now rely on Kyousuke to basically do anything she wants him to do, or just ask him to do things and say it's "life counseling" as an excuse, since Kyousuke said he will help her out with "life counseling" Kirino decided to use that as her excuse. But when will this eventually pass away, and Kyousuke just doesn't care anymore of protecting Kirino from all these troubles that she gets herself into? What if Kyousuke doesn't come to Kirino's aid when she needs it? Is that what happened in the past? Where Kirino was clingy to Kyousuke like she is now, but when she actually needed him, Kyousuke wasn't there? (Probably at Manami's house? Since he does visit there alot)