Lexie Lowsley is Simon's younger sister. She has always been close to him and she feels like nothing can come between them. When Lexie gets a job at Waterloo Road, she and Max soon get close. She's been single for too long. It isn't long before they both end up in bed together. He's married but looking for a thrill. Lexie and Max both know that their relationship is just sex. But will it become more than that?