Dear Cubicle Coach
While my supervisor has been on maternity leave, I've stepped up and become the leader of the department. There are no positions between mine and hers, and I know I'll be bored out of my mind when she returns. Is it reasonable to ask for a new title, or at least a raise?
The title and the money are side issues; the key point is you say you'll be bored out of your mind when she returns and you have to go back to your old duties. It's possible they can shuffle some things around to get you more responsibility, and it's certainly not out of the question to ask for a bonus to cover the months that you were doing your supervisor's job. But you've seen Paree, kiddo, and there's no going back. It's time to think about making a move, within the company or outside of it. You're ready.