Prompt + Fill: After, the incident in the subway, Credence boards a ship for England. But not before picking up his little sister. Modesty goes with him because, no matter what he did, he's her brother, and they're the only family they have left.

Please no Credence/Modesty. Just a brother-sister relationship.

(http://fantasticbeasts-kinkmeme.dreamwidth.org/459.html?thread=142539#cmt142539)

AO3: http://archiveofourown.org/works/8701639