Aaron looked at Fallon as Iris didn't know what the room of requirement was and gave her a look that said 'are we the only two people that know about it?' He then looked back to Iris. He was about to explain it when Fallon started talking first. When she was done he turned back to Iris and said, "It's a room that can be any room depending on your needs. It's so cool! We have to show you before the end of term!"