Draco gave a soft whistle as he watched her work. "I don't think I could do half that much that fast," he said, smiling at her. "I think it is a damn good thing you were on Potter's side during all that unpleasantness, Granger. If you'd been on my side, we would have won. As it turns out, rather glad your side did, even if I could have ended up on the island permanently."
He stepped behind her and gathered her hair up, holding it off the back of her neck so she could work the clasp of the necklace. While he was there, he took the opportunity to kiss her nape and purr at her. She brought that out in him.