Severus stopped entirely when Hermione apologized, and he shook his head, smiling. "Never apologize for enjoying yourself, darling," he whispered, stroking his fingertips over her back once more. He licked lips a second later, before shaking his head again, because ... well, he'd just been overcome with the urge to kiss her, but he couldn't very well do that when they were like this. Not without snapping her spine or something.
"Would you like to try it again the other way, now?" he asked then, with a slight shrug. Because now he'd stretched her out a bit, it would probably work. "I must confess, I'd rather like to kiss you," he added, a bit sheepishly, even if he didn't think she'd laugh.