It wasn't meant to be funny, but Ginny still laughed through the kiss knowing that Harry's hum was a form of praise that he could finally touch her. She had replayed their last conversation over in her mind while she had been waiting for him to come home, and it was so obvious now that he had practically been sitting on his hands to keep himself from doing anything that she might not have want to do without her memories to back it up.
It was incredibly sweet and so very Harry that she wasn't even surprised by it, just pleased that he was so willing to bend to her needs even though he certainly had his own.
And then his tongue was in her mouth and most of her ability to think logically sailed out the window as her body was pressed between Harry and the wall. All she could really do was hold on, throwing herself into kissing him as her fingers fumbled to unclasp the heavy wool cloak he was wearing.