Severus groaned anew when Hermione began to rock against him. If that didn't say she wanted him to go faster, he wasn't sure what might have. In fact, he'd only just made up his mind to do just that when she asked him to in words, as well. And so he did. Because it was obvious now that she was enjoying this, and not simply gritting her teeth against the pain in order to get it over with. Or maybe that wasn't what she was saying at all.
In fact, he'd thought briefly of asking if she wanted to change back to the previous position, but he stopped himself, because she appeared to be enjoying herself quite a little bit now, and she might have been cross if he interrupted that. He hadn't thought she would actually come this first time, because from what all he'd read, that seemed to be exceptionally rare. Then again, she'd come only minutes after he'd broken her hymen, as well, so evidently she was still every inch the overachiever.