She held her wand behind her back as she examined the now pristine room, lifting her chin, her eyes glowering at the seats that would soon be filled with warm bodies. She flexed her fingers. First years...they were at the very peak of learning, ready to be moulded with a stern hand, nurtured with strict regulation and logistics of their environment. It was the perfect time to ensure they knew the proper way to grow - no need to indulge in casting needless spells, no need to interact with the opposite sex, no need to indulge in fun and joy. They would learn quickly that school was a place to learn, and learn they shall.
What was more amusing...was the fact that she had also assigned some older students to the first year's classes to really ingrain their inferiority.
With a swift flick of her wand, the door creaked open."Come, children. Make a nice orderly line, collect a textbook and ten sheets of parchment. We shall be learning how to write essays today, and how to efficiently write upon ten pages, double-sided, about the invention and usage 'Protego' spell. Hm, hm!" She squeaked after, sickeningly high-pitched with a slight croak at the end, her eyes glazing over the little students' heads.