When Yumi Sin’s friend Penelope Woods and her stepdad Gunnar Stone visit her and her stepdad Johnny Tattoo they discover that Yumi and Johnny have a very interesting relationship, and Penelope wants to have the same type of closeness with her stepdad. After Johnny talks to Gunnar, the four of them go out to hang at the pool and the girls ask their stepdads if they can help them put some sunscreen on. This is when Gunnar and Johnny decide to swap their daughters and have a naughty time by the pool!