keeping the appearances

Joan asked a great favor to his big bro Mick a night out in body with the legal age to drink. So they bought a magic formula to swap their bodies so while Mick remained at home under the control of his parents control, Joan was at the pub with his friend. Later one of his friend called him and said his bro was too drunk too drive so he could sleep at his home. The following morning Joan was not come back yet and Mick for keeping the appearances he has go to school instead of his sis, this he didn't expect.