Charlie had taken to inviting Harry to the Preserve for Halloween; the treats to a flyer that dragons were helped overshadow the tricks of memory to which Harry fell prey around that point in the year, and he knew that Harry was grateful for the distraction even though they never spoke plainly about his visits.
With chocolate cakes baking and Harry sleeping soundly, Charlie was free to watch his friend. Asleep, one would never know that he'd suffered. Awake, there was sometimes a sharpness to Harry's movements and glances that spoke to his pain.
Charlie loved gentling Harry by degrees.