Theo had left to pick up their bonds a moment prior from the Lovegood's home and Draco decided to stay and welcome them on arrival. He told Narcissa to give them an hour or so, hoping Hermione would feel a little more comfortable before barraging her with the wife of the death eater who had duelled with her at the ministry last year. He knew this was a big deal for her, to come to his home and stay. He also knew that once the awkward hello’s and niceties were out of the way that she would actually like his mother.