In a twisted turn of events, Holly Lace finds her stepsister, Kate Dalia, devastated on her birthday after being dumped. In a fit of mischief, Holly suggests a wild fantasy to cheer her up - a family affair. Kate, hesitant at first, is soon swayed by Holly's persuasive tongue, both literally and figuratively. Their stepbrothers join in, and the family home becomes a den of debauchery as they celebrate Kate's birthday in the most taboo way imaginable.