Les demi-sœurs Avery Moon et Jay Myers passent Noël avec leur belle-mère à forte poitrine Casca Akashova

Stepsiblings Avery Moon and Jay Myers are spending Christmas with their stepaunt Casca Akashova. After she puts them to sleep by reading them a bedtime story, Avery convinces Jay to sneak out so they can open their presents early. Casca catches the stepsiblings playing with their toys, so she tells them they have landed themselves on her naughty list. Casca ends up joining the stepsiblings as the three make quite the Christmas mess.