Blatant clopfic with heavy emphasis on bondage and BDSM. Steer clear if not your thing.
AU Tag because no Thorax or Flurry Heart, just to be safe.

To many the relationship between between Princess Cadence and Prince Shining armor seems like fairy tale. A princess of Love married to her knight-turned-prince, inheriting and entire kingdom to rule and govern on their own. Those who think about it for a few moments more realize that the married couple aren't quite so majestic and storybook like behind closed doors, certainly nothing the foals should know about it. It turns out, something much more interesting happens in the walls of the Crystal Palace, something only two are aware of, and not the two one might think.