To Harry there was always one Wizard who could calm him did like a grandfather would, or an older male gentleman who he trusted enough to allow comfort would always be Remus and Hagrid when he was at Hogwarts. When he was home he had Sirius, but at school he was glad he had someone to confide in that had more life experience than himself. Draco came along to support him, he may not have been someone Hagrid liked, but he would do anything for Harry.