Fics like One Wish

When Lucy's spur of the moment wish is granted by a magical artifact, she and Natsu find their magic unexpectedly switched. It's a problem the likes of which neither of them, nor the guild, know how to undo. An already bad situation turns worse when assassins make an attempt on Lucy's life, leading to the uncovering of a sinister plot that could mean the end of Fiore itself.

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