Steam - NaVia fan fic

"Water and fire make steam.. why can't we, little sister?"

"Because you'll hurt each other if you're not careful, Natsu-Nii!"

"Then tell me how the fuck I keep the love of my life!"

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Natsu Dragneel is the nineteen year old heir to the Dragneel Yakuza, and can switch his moods with a snap of the fingers.

Juvia Lockser is a normal eighteen year old girl, pale but fair skinned and majoring in art at Fairy Tail University.

When water and fire meet, steam erupts like fireworks on July 4th. Only Niki, Natsu's little sister, senses the possible danger of these two being together, since Juvia could be used against them.

Her job?

Make sure they have a future together.