Meggy has found an ad on the Internet for a relationship that she never dreamed possible. The ad is from David, who wants to play being "Daddy" to a big "girl". And she knows she has to meet him.
Daddy-David is everything Meggy could have hoped for. Loving, kind, gentle, yet super strict when his bad little girl needs it. And he knows everything bad girls need, super-duper hairbrush spankings when they swear or are sulky, old fashioned temperatures and hurty enemas when they pretend to be sick.
But the day comes when Meggy must leave and become Meg again, while she decides if she wants to stay with Daddy-David forever. It's the hardest thing either of them has ever had to face.