I think an issue might be that certain dialogues might only be available under certain conditions, i.e. player choices.I will go and replay the scene as it seems I am missing bits and pieces. But you two seems to be at odds. Johnny says that the kiss was the first piece to fall, please correct me if I am wrong don't want to miss interpreted anyone, but Maccabbe says there was no kiss before the one in Ch4.
If there was a kiss with Katie before Ch4, I kinda want to know where because 6 years is a hell of a difference if you are 16/10.
I still don't buy William running from fear of Leia, but if he now runs because of Katie... I don't know.
If you look at the spoiler I posted previously about the kiss and relationship taboos etc, she will see how various seperate dialogues tie together