 As Casey and Sam s one month anniversary (or as she says, monthiversary) approaches, Derek starts to think that Sam is whipped. Deciding to get back at Casey for going out with his best friend, he goes out with Emily but realizes that they have nothing in common. Once they discover that Casey is spying on them, they decide to trick her into revealing herself and it works. Sam shows up to reconcile after Casey and him had a fight. He pays the check for her and the two make up. As Derek and Emily s "date" ends, Emily decides to grow a backbone and she kisses Derek on the lips, something "she s wanted to do for a while." Meanwhile, Edwin notices Lizzie s growing aggression towards the school dances and goes to Nora and George for help.