One upon an evil time

Once upon a time, there was a beautiful princess.
Her father promised her to an evil prince.
The evil prince killed all of his rivals, and every adventurer trying to free the princess.
The princess had no choice, and she married the prince.
Then, that night… while the prince and the princess were alone.
The princess killed the prince.
Because she was evil too.
She burned down the prince’s castle, killing everyone.
And she brought the prince’s head to her father.
“Our plan worked,” she said. “Both kingdoms are ours.”
And they lived happily…
Until someone more evil came around.