While I'm grounded in class, I use my teacher's dildo to masturbate.
Because I'm a naughty girl, I get detention in class and I have to stay there, but since I'm very curious, I go through my sexology teacher's things and I find the dildo she uses to teach us. So I sit down and start playing with the dildo and practicing everything I've learned in her classes. How to suck it, how to use it on my pussy, how to ride it and how to cum.