Serena is a genius prodigy, and her stepdad Tony is so proud of her. To brag about her little Einstein, He invites the neighbors Juan and his stepdaughter Fiona over. Everything is going ok until they realize that Serena and Tony are very handsy with each other, kissing in front of them and doing some pretty taboo stuff that makes them too awkward to say anything. When Serena invites Fiona into her room to show off all of her medals and awards, Serena confesses that she and her stepdad have a special kind of relationship in which they both keep each other happy: Serena keeps Tony’s sexual needs satisfied, and he buys her anything she wants. Serena teaches Fiona how to do the same with her own stepdad, but Fiona and her stepdad take a while to get comfortable with each other. Serena and Tony prove to them that as long as everyone’s happy, then it doesn’t have to be weird. Swapping stepdaughters is a good warm-up for Fiona and Juan to feel comfortable with the idea, but the idea of tasting stepdaddy’s dick becomes too tempting all of a sudden…