Teachers like this aren't very common because they've usually been fired!
Stella is a grade A student, but it's nothing to do with her academic ability, it's all down to the way that she sucks her teacher's cock. This tricky old teacher has Stella well trained and he knows that every time he invites her to his office she's bound to do exactly as he suggests because she's one of those students that has to be at the top of her class.