Professor catches me in the cam

Normally, I lead a rather exemplary life as a student who finances her studies as a webcam model on the side. During my last webcam show, Professor Schmidt suddenly appeared in my chat - right at the time when we actually had an appointment. I was overcome with panic because this horny sack of shit had been watching me for a while. He seemed to know that I urgently needed a good grade. In that embarrassing moment, I realised how I could get his attention to improve my grades. Can you guess how?