Oh, what a fantastic, beautiful take on Minerva. I adore the voice you gave her. She's my favourite female character in the novels and always has been, for all the reasons you flesh out in your fic: her primness, stubborness, and authority, the ever-lurking possibility of flirtation with her dark side - personified in the young Tom Riddle, the sudden flashes of acerbic humour (a motley crew indeed). I also love how you gave her self-doubt, without ever making her too angsty. Because Minerva wouldn't be angsty, even if she were surveying herself critically.
And Kingsley: there's something very sweet and sexy how Minerva suddenly sees him in a new light when she realises that he's giddy, and the ending when his deep voice had laughter in it. I don't think I've ever come across a Minerva/Kingsley fic before, and my immediate thought when I read the pairing was: yes, they fit so well!
Plus: the rat Melchisidec - I was about to google why that sounded familiar, but kelly_chambliss solved that riddle for me. Lovely reference.