Sophie is just not an "A" student. In fact, she is having trouble making passing grades for PD. this should come as no surprise that he has way for her to pick up several "extra credit" in his course. She is graded on pretty tough rubric. Pain & suffering will earn her points. So will cumming on command. Sucking & fuck are quickest way to top of class, though, & Sophie wants that ???A???. PD is not going to just give grades away, either. Pain means canes. Her orgasms will have to be intense & perfectly timed. & PD expects her crotch to be wet for him whenever his cock is hard. He even turns her into hot swing. It looks love she enjoys being used so much it would not be surprising if she came back for even more ???office hours.???