She snorts, but behind the banter is working rapidly. Now that she’s recovered from the surprise a realisation has dawned on her. She cannot risk Draco smelling Harry and the Weasleys in her house, so soon after he warned her away from them. She doesn’t know quite how strong demon senses are – can he smell them even from upstairs? – but she doesn’t want to test it. She needs to get Draco out of her house, now, without incurring suspicion.