You are able to recover

"No... we should not..." You manage to say as the image of James comes to your mind, allowing you to overcome your desire. "We're teacher and student, and it should stay that way."

"Aww Mrs. Shaw, are you sure about this?"

"Yes, and as I said, it will remain that way."

You manage to convince Robert and pull your skirt back down as your heartbeat goes back to its normal pace while you pack your belongings into your bag, rushing to get yourself away from Robert as quickly as you can. You're not confident that you will be able to turn him down if he persists.