He covered his surprise almost immediately, but she'd seen it.   A moment of vulnerability had trembled behind the shield of the raised brows and the accompanying mocking twist of his mouth and that made her glad she'd admitted it was for him.  For a man with enough friends to pack their flat, he was oddly shocked to be given anything.   He pulled himself to his feet with  exhausted, put-upon grace, and took the flower.  "If you don't put it in water, it will die," he said.  "Sometimes I wonder why they called you so clever at school, Granger."