Schoolgirl farts in class

I was called to the principal's office because i farted in class. i had very bad gas and couldn't hold it back. i apologise and say that won't happen again. the principal told me to show him how it happened. i get up and tell him and then let a huge fart out while i bend over. he asks me to fart more for him. i agree to that. i really don't like detention, but i really like to fart. i give him lot of farts in my schoolgirl skirt. he watch from under so  he can get a pretty view of my big ass. i like to tease him so i talk dirty to him sometimes. he turns out to be a great fart sniffer.