Captured And Saved {NaLu}

Lucy Heartfilia the only princess of Jude and Layla Heartfilia. King and Queen of the kingdom of Fiore.

Natsu Dragneel the only Prince of the Red Kingdom, son of King Igneel.

Lucy grew up with her overprotective parents, while Natsu grew up with his strict father.
One day when they were both 5 they meet by chance at the Tree of Fairies on the border of the 2 kingdoms..
They would sneak out to constantly see each other day after day for years until their parents found out...
Years later the Red Kingdom and all its people collapsed and was never heard if again.

Disclaimer:

I don't own Fairy Tail! Hiro Mashima does!