The days of Men and Elves will come again when two Sons of Adam and two Daughters of Eve take the Narnian Thrones. However, to obtain and protect the Crown will involve a Fellowship of thirteen members, a search for seven swords, a battle of five armies, four children, two wizards, and the One Ring.
One woman of Amator, Two nukar, Three different worlds, Four small hobbits, Five siblings, Six thrones, Seven friends of Narnia, Eight who were family, Nine of the Fellowship. One broken heart. One betrayal. One death. And there is One who watches over them all. (Bad summary - better one inside!) Rated T because I'm paranoid.
Also with Ranger's Apprentice. Adopted from IAmAFantasyFan. Middle Earth is in trouble. The Valar decide to send help. Peter, Susan, Edmund, Lucy, Will, and Horace are all sent to answer the call. Will they be accepted? Takes place during the Fellowship. T for paranoia. Need not have read all three
The White Witch of Narnia blunders when she tries to become ruler of Middle Earth at a crucial time, and unwittingly helps two desperate hobbits on a quest. There are consequences for Narnia too.
Cora and her three friends are unexpectedly thrust into the Battle for Middle-earth. But what role are they supposed to play? Based on my headcanon that Middle-earth and Narnia are part of the same world and are in fact connected to each other. Four OCs, plus the cast of LotR and the Pevensies.
What if Narnia and Arda are in the same world? This is the story of The Dawn Treader landing in Middle Earth after being knocked off course by a storm. The Pevensies and Caspian meet the Fellowship. This story takes place after Dragon Island and after the War of the Ring. No romance.