8 XXX : gifsgonewild

Punishment: 1. On your knees. Bad girls should be in a submissive posture. 2. Pull your panties around your knees. They will stay there. 3. Since you're so eager to touch yourself, obviously you've done a great job of learning in that class. So for every grade difference between your current grade and an A, edge one time. So if your grade is a B, edge one time. If your grade is an E, edge 5 times. 4. Reward yourself for the grade you did earn by cumming once for every grade difference between your grade and an E. So if you earned an A, cum five times.
The real punishment would be to not allow you to touch yourself in class. However, we both know that would be extremely cruel and I am in a forgiving mood today. I think a few swats on your bottom as you lay across the professor's lap is in order. The more you touch yourself, the more spankings you receive.
I'd say bend over for some smacks. Your butt will peek out under the short skirt, and your legs look great on top of those heels.