In a universe where ethics are flexible, Beth and Morty's incestuous desires collide. Beth, desperate for Morty's unique "gene-splicing," seduces him in the garage. Morty, hesitant but aroused, allows Beth to undress him, revealing his impressive, uncircumcised cock. She strokes it, feeling its heat, before guiding it into her wet, hungry pussy. They fuck passionately, Beth riding Morty reverse-cowgirl, her ass bouncing, until they're interrupted by Summer.