"Maybe," Draco realized he was walking into dangerous territory, the way her eyes narrowed. "I didn't realize it until I saw you before term, and then it was... dizzying, the strongest of that doubling I'd felt. I think I knew then why it was, but now...." He shook his head, and then he reached for her hand with the hand that had been rubbing his temple, brought the both of them down to her tap, his thumb brushing against the pulse at her wrist. "It was the only time it was completely terrifying."