The Princess, The Prince, and The Peasant

Once upon a time, there lived a princess. A beautiful and generous mare anypony seen. The princess can and does have anything she desire. All but one thing. One thing she desire so badly, and that thing is the will.
The will to live her life without her father controlling her life.
The will to love for love, instead of being force to marry somepony.
And the will to love the orange peasant mare.

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There may be a small problem with the story, and that is the characters;
Such as King Sombra being the king and father of Rarity.
It's odd but who else is perfect to rule a kingdom- the one who already has King in his name. •*• Bare with me on this story....