When stepsiblings Tyler Nixon and Lily Larimar visit their friends AJ and his stepsister Kylie Rocket they expect to have a great time during their slumer party. Kylie and Lily decide to watch a scary movie and wait for their boyfriends to sneak in to have some fun, but Tyler and AJ play a prank on them, put on some scary masks and spook them. The guys sneak into their room and decide to swap their stepsisters and eat them out from behind! The girls think is their boyfriends at first, but when they discover that it’s their stepbrothers they agree to continue having fun as they were doing a great job eating them out!