Charity/Minerva
"Charity, come on in." Minerva called out when she heard the knock on her door. Swiftly, she stacked the papers she was grading and set them to the side of her desk. Charity was her first pitch, then she had Pye and Slughorn to go. "I hope you're doing well and the students haven't driven you crazy with all this Halloween madness."
Minerva poured the tea and offered one cup to her co-worker and friend. "Sorry for such short notice, but something has come up and it seems now is the proper time to address it." She took a deep breath and recalled what it was she wanted to say and continued once Charity was seated. "Before, I get into the heart of the matter, I must ask for your word on keeping this strictly between us..." Not that she wasn't going to make sure with a Memory Charm but it was polite to at least pretend there was an option.
"You have surely heard the rumors of a secret society, created by Albus Dumbledore, well..." There was only a slight pause. "To do none other than fight Voldermort." Again there was a pause. "It is of course true and I have called you here to ask you to consider joining us." That was all she was going to say till she had some clue if she should go on or not. There was no need to get into the details if Charity wasn't interested.