Disclaimer: Characters belong to J.K. Rowling, and sadly enough not to me.
When Bill and Charlie came home from Hogwarts from Christmas, they would bring Percy with them into their bedroom and tell him all about the school he would soon attend himself and the semester they'd just experienced. All three of them would climb up in Bill's bed, huddling under the cover, with Percy in the middle, trying to get warm in the too cold room while the winter wind was howling outside. Bill and Charlie told stories about Gryffindor and quidditch and beasts and potions, both of them exaggerating a bit, almost competing who could make Percy's green eyes shine the most.
When Percy came home from Hogwarts for Christmas and Bill came home from Egypt and Charlie from Romania, they would still curl up under the covers in Bill's bed, even if the bed was now creaking alarmingly under their weight. Bill would tell stories about goblins, and Charlie about dragons. Percy was still interested and listened politely, but not even the wildest exaggerations could get him as excited as when he was younger. But when Bill and Charlie learned that he'd been made a prefect and wrestled him to the floor in celebration and tickled him till he was wheezing with laughter, his eyes still shined bright.
When Bill came home from Egypt, and Charlie came home from Romania, and Percy for once was home from the Minstry, Bill and Charlie would try to pursuade their younger brother to come and share stories again. But Percy would blame an important report and leave for his room. His brothers would grab his arms and try to pull him with them, but Percy shook his head and shrugged off their hands, and his eyes were cold and hard behind his glasses.