Wank For Me Sir!

Your very attractive student has just passed her exams and she's been out celebrating. She swings by yours to thank you for all your help and wants to show you photos on her phone of her night our celebrating with your other students. She bends over the sofa to charge her phone but you're able to see right up her dress and now your cock is hard. She catches you perving and encourages you to wank your cock for her while she teases you ?