He is terrified, aware that he may never see his parents again, or that he might not survive the night himself, but he has made his decision, and he won’t go back on it. He apparates to what he hopes is the right address, and stands facing a very modest house in a very modest neighborhood. It is surprisingly well-warded, though, and while his Malfoy blood is no help, the wards recognize the Black in him and eventually yield. They fall, and he takes a few steps toward the door.