She was kissing him back. She was kissing him back! Harry's heart rate raced just a bit faster, and he pressed his other hand behind her back, pulling her against him. It was a little awkward, given that he was almost two feet taller than she was, but that didn't matter. Not at all.
What were the things that had always stopped them? Work. His and hers. Working together. Future. Past. Complications with other people. Whatever. Right now, there was only him and her, and Harry didn't give a crap about the rest.
There was still an excellent chance that he was going to be shot after this, so he wasn't about to go and waste the moment thinking about anything else.