Casey Calvert and Keira Croft are two step-sisters who just found out that they're dating the same girl! It seems that Zoe Sparx has a thing for step-sisters and deceived them by dating both of them at the same time. But instead of cutting ties with Zoe completely, they have an idea on how to get back at her. Casey and Keira aren't going to let Zoe get off THAT easy!