Ginny had always been able to keep her hormones in check when snogging boys. She had always been afraid of what her brothers would do to a boy she would take it too far with, but this was Harry. When she felt him moving away slightly below where they were kissing, she knew he was getting just as excited as she was.
Instead of letting him pull away, Ginny lay back on the seat of the compartment and pulled Harry down with her. She wanted him to know it was okay that he was that turned on, she was pretty sure she was dampening her knickers even though they had only been snogging for a few moments.