When Billy Boston and Robby Echo are playing hookie they realize that their respective stepsisters Minxx Marley and Haley Spades are doing the same thing! The guys spy on the girls as they play in the pool and then while they’re taking a shower Minxx and Haley catch their stepbrothers sneaking a peek, so they invite them to join them! The guys end up swapping their stepsisters and having the naughtiest foursome in the world!