"It's fine. Come along."

Businesslike. Severus looks over his shoulder and motions at his office-- a book inside closes, then the door shuts. He pulls out his own communications device and sends someone a message before setting out, making sure the lab doors open for her and close behind them.

You can't escape, Darcy. Be careful what you wish for.

"You know that I'm a schoolteacher," he says-- not really a question, but like he's confirming with her before proceeding with something else.