There were a small handful of people in the world that he considered family. There was no doubt in his mind, or to anyone that saw them together, that these two were close. Lucy also had the unique distinction of being one of the only women in the world that he wouldn't ever dream of flirting with. Which, when you knew Roger, meant that he really cared.
He had been worried about her, ever since all these stupid decrees started being made. He knew she was a Muggleborn and he knew that a lot of them were on the run. She was brave by coming back to Hogwarts and he only hoped that she wouldn't have to go into hiding like his mother had.
But, for the moment, he kept things light as he grinned at her. "Then I expect the next time I see you, you'll be able to pick me up, you giantess. Did you have any problems getting here?"