Growing Up - A Miraculous AU

Ever since Marinette Dupain-Cheng was a small child, she and Adrien have been the best of friends. Marinette's older sister, Bridgette, has always teased her about Adrien, while Marinette insists that they're "just friends". Adrien has always said the same to his older brother, Felix, until recently, when Marinette goes missing. It was like she had vanished. He had seen her only a minute before it happened. As he looks for her, he realizes how much he misses her- and it's not like how he misses Nino, one of his only other friends, when HE goes away. It's different with Marinette, and he can't quite figure out why...

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Credits to Jeremy Zag for creating Miraculous: Tales of Ladybug and Cat Noir, the show in which this fanfiction is based off of!