Yes, he did know that...though he certainly wasn't thinking about that at the time. He had honestly attempted to think about it, like she asked, but every time he did he'd get the same sneaking fear that he'd do something stupid and ruin everything. Not to mention that carrying his name meant carrying a lot of weight and these days it wasn't exactly a good kind. He hated carrying it and it was his bloody name
Neither one of them really had to speak. Despite the short time they'd been together, both of them had grown accustomed to each other. He knew what she wanted without asking and he was sure she could read him like a book. He'd never been very good at hiding what he was feeling and with Daphne it was even worse.
Eventually, he did give in, his lips continuing their trail forward. He'd tease her for as long as he could and she was aware of it, he was sure. The counter may have been a bit high and a bit crowded, but for the moment Harry didn't mind. She was right where she needed to be.