Chad apolgises for all the errors in his stories of familial love wherein the parents of this sexy girl are encouraging their daughter in re-enacting the night she was conceived. Who really cares about minutia; I call it "quertyoops" and it doesn't spoil an otherwise truly entertaining tale. So there!
As with other Chad's stories where John and his wife do such nice things with their daughter, I recommend reading it at least twice to really savour the nuances. And it is a very easy way to get grandchildren.