I rush into the gym in my school uniform. I was supposed to be having extra P.E. as I have been failing but I have forgotten my gym kit again :( My nasty gym teacher tells me off and says that there's no excuse so I have to do it in nothing but my school knickers!!!! I'm shocked but he's going to fail me if I don't comply so I strip. Its unbelievably humiliating as he makes me do all sort of exercises such as press ups, star jumps, hand stands etc with my boobies bouncing around while he watches and uses his horrible wooden stick to spank me the whole time, especially if I slow down!