Now there's trouble!

During the big break, I called one of my students into the staff room. I've noticed that just now, when the difficult exams are coming up, his mind is completely off things. He seems to have a sexual problem. He tries to look up my skirt at every opportunity and he keeps looking at my butt. Now I'm going to confront him. After I get a little stricter, he admits to me that he can't think of anything else but seeing his teacher nude and shameless. I'm indignant at first, at least I pretend to be, but actually the idea of showing myself nude and shameless turns me on quite a bit. So I go for it and show him everything, but he also has to get his cock out and really jerk off to my show...