"I believe you have no other choice, darling."

Barty's voice is cruel and there is a vicious, mocking grin present on his face. By an accident, you found out that the new professor isn't, indeed, Mad Eye Moody. And so for weeks, you've been forced to keep his presence a secret, feeling like a puppet in his hands that dances as Barty pulls the strings.

Naturally, there is only so much a human can take. You spend each day working, standing next to the disguised death eater as an innocent assistant who pretends to know nothing, and when the sun sets, you fully fall hostage to his torture.

"Either you keep your pretty mouth shut and do as you're told, or... My hand might slip. And that wouldn't be nice."

He is blackmailing you, as simple as that, and it would be foolish to think he's bluffing. Even if you don't want to, you're forced to cooperate. Not for your own sake, but for every life at Hogwarts which is dear to your heart.