Earmuffs - A Doctor Who Fanfiction

Luna never knew that a pair of earmuffs would lead her to travel with the Doctor. But with traveling in the TARDIS comes danger and undiscovered truths about her, the Doctor, and Luna's past. The more they travel, the more dangerous things become for Luna and the universe. What is happening to Luna? Is there a way to stop it? And how awesome can a pair of earmuffs be?