Serena stepped into Professor Bree's room. She noticed Lee was there for the meeting. She turned to Ashlie and said, "Can I have a word, in private. Professor Bree, and you can stay as well if you like."
Then she turned to the others and said. "I'm sorry I can't stay, but one of my Gryffindor classmates drowned, so I need to be available to the students right now. I hope you don't mind stepping out, it will only take a moment. Thank you." she said as they filed out into the hallway.
She closed the door and placed an imperturbable charm on the door so the others couldn't overhear.
Turning to Ashlie and Professor Bree, she said, "I'm sorry, I was hoping to get a chance to talk to you sooner. I know you were concerned about Lee's loyalties, so I have been keeping an eye out on him. I saw him leaving Miss Schmae's office last week. He looked upset. Then a few days later I saw him speaking to her in the Restricted Section of the Library. I overheard her asking him about 'secret societies'. He only mentioned us as a 'study group,' but I'm worried that she could be using him for information. Lee being present in our meetings could compromise us. Just be careful with what you say in front of him. I've got to get back to Gryffindor Tower. Ashlie, you'll have to catch me up with what's going on later in the Prefects' Lounge."