well not enough study bad grades need to be punished vibrator in her pussy or ass as she is spanked as she tells you she will do better next time

It was embarrassing enough that she had to display her spanked buttocks for 15 / 20 minutes - I guess she will do better in the future: lessons learned (at least until her next misbehavior) 

I am sure she will misbehave before the end of this term and will need to be taught another lesson

mmm , Serves her Right Then