When You Remember

Alternate Universe. Set place after The Lion, The Witch, and The Wardobe and before Prince Caspian, but in The Golden Age.

The Pevensie siblings found themselves summoned back to Narnia for the second time when they fell asleep. One thing that scared them the most was that they could wake up any time and leave Narnia without rulers once again. This led to another problem they had to face when they found Tusla.
Tusla found herself in Narnia not remembering any single thing. When Edmund found her, he had no idea that she was from London, like he was. So, the mission began for the Pevensie siblings to find a way to help Tusla go back to London before they were woken up at an unexpected time, leaving Narnians and Tusla helpless. Only after they found a way, they realized it wasn't possible because Tusla's way of finding Narnia was not like theirs at all.

"What if after this, we don't get to see each other again?"

"Then, no matter what happens, I want you to know everything was worth it. You worth it."