I remember my 10th grade teacher very well. She used to do something similar to this and one day I was held after class and she questioned me about what I was looking at. I truthfully told her. She got up, locked the door to the room and came back to her desk. I was then "encouraged" to service her slingbacks by shining her patent heels with a cloth and then when finished, I had to service her feet directly. She told me my grade in the class depended on it so I did. Ended up finishing that year with an "A+".