A family of four returns to their holiday home, unwinding after a fun day at an amusement park. Laura and Eric, as the stepmom and stepdad, head off to prepare dinner while Jordan and Oliver, the step-siblings, stay behind. Grateful for the enjoyable vacation, Jordan and Oliver can't shake off a sneaky feeling that their step-parents might have an ulterior motive. When dinner is finished, Laura and Eric continue their kind gestures towards Jordan and Oliver, making them wonder about their intentions. Feeling a bit uncomfortable, the step-parents confess to Jordan and Oliver that they share an unconventional background—they were actually step-siblings at one point. Laura and Eric disclose that they fell in love when they were younger, leading to being kicked out of their family after the forbidden affair became known. Despite the shame, they both went separate ways and settled into conventional relationships, eventually becoming steps into Jordan and Oliver's lives. However, their love never faltered, leading them back together, even through different marriages. Flabbergasted and appalled, Jordan and Oliver digest this news. Laura and Eric insist on the purity of their bond, hoping to forge a new level of intimacy as a family. They propose the idea that all four members engage in a sexual relationship together.