Greta didn't like the speculative tone of Z's voice at all. "I'm giving you ideas, aren't I? That can't be good. Oh well, at least this way I'll know who to come to for the counter-curse when all the boys in your year simultaneously develop broom-related rashes."
The brooms flew tidily back to their places, leaving Greta astonished - and maybe even a bit envious - at the control that Z had clearly developed at some point over the last few years. Maybe if she'd come back to Hogwarts as a student as well - but it was just an idle thought. She really had enough to worry about without imagining adding essays and exams into the mix. She had an office that was quite possibly out for her blood, an entire school full of students with unknown Flying capabilities, and now she had to figure out what to do with a rule-breaking student who just happened to know about most of the rule-breaking Greta had broken in her day.
"I hate to disappoint you, but I'm only here for the Flying classes - and the Quidditch of course - as I'm the new Flying instructor on staff. Oh yes, and I think that means I can hand out detention to upper year students caught trying to steal school property."
Greta folded her arms and did her best to look stern.