Wormtail!
One of the four names that had appeared on the Marauder's Map, alongside Prongs, Padfoot, and Moony.
The latter three had also appeared in the Marauders' Notebook Harry had obtained earlier, which he had hardly looked at lately.
"You've heard that name?" Lupin's powers of observation were remarkable. He noticed the change in Harry's and Ron's expressions and asked.
"Well, I'm not sure whether it's connected to him..." Harry hesitated, but continued, "And Prongs, Padfoot, and Moony?"
Before, Black's eyes had only reddened when he mentioned Harry's father, James Potter. Now, however, as he heard Harry say those names, tears suddenly spilled from the corners of his eyes.
He had been standing beside the bed, berating the rat inside the glass dome. He sank back onto the bed, covered his face, and began to sob loudly.
Not only him-even Lupin, who had remained calm until now, had tears in his eyes.
Unlike Black, who had lost his composure, Lupin still managed to control himself. He looked at Harry and Ron in surprise. "How do you know those names? To be honest, only the four of us should know them."
Ron looked at Harry, his meaning clear: you decide how to answer.
Harry hesitated and did not mention the Marauder's Map.
"It was a notebook I found inside a thick book about Animagi. It's called the Marauders' Notebook," Harry answered, then asked tentatively, "So you're the Marauders."
"So it was tucked inside a book." Professor Lupin nodded. "James spent several days looking for it back then. Well, if it was in the library, it certainly wasn't somewhere he'd easily find it." As he spoke, a smile touched his lips, yet another tear slipped gently down his face.
"I'm Moony, and he's Padfoot..." Lupin pointed at Black. "Peter is Wormtail. As