Midnight might use his illusions to make Lucy think she's lost her Celestial Keys. This would be a huge psychological blow to her. But then Lucy could remember the bond she has with her spirits and break through the illusions. It would be a battle of wills as much as magic.
One common theme is friendship. The two Nanas have a very unique bond, and many fanfictions explore how deep that friendship can go. It could be about them supporting each other through tough times in their lives.
One popular 'nana x nana fanfic' story could be about their adventures in a new city together. They might discover new music and bond over it, exploring the local music scene.
Sure. One great piece of nana x nana fanfiction is 'The Unspoken Bond' which delves deep into the complex relationship between the two Nanas. It shows their mutual understanding and the unspoken support they have for each other in a really touching way.
First, understand the characters well. Know their personalities, dreams, and fears. For the 'nana x nana' pairing, it's important to capture their unique bond.