Can You Concentrate?

Charlie has agreed to give you a hand with your coursework for Uni, you have been struggling to concentrate and she soon figures out why. She is wearing a short skirt and while she is going through her notes from the lecture she catches you trying to get a look at her panties, she figures it will help your concentration if you can get your load off so she tells you to pull your dick out of your trousers and wank while she teases you with her panties and pussy.