The boy with the Niffler

Mabel has always been an only child, her whole life.

Now she is seventeen and spending another summer in gravity falls with her grunkles Stan and Ford.

One day a boy barges in chasing a black rodent like creature, with a suitcase in one hand.

Fantastic beasts au

AN: Characters belong to Alex Hirsch.
Fantastic Beasts and spells belong to JK Rowling. Artwork on front cover is credited to Honbie (found on google)