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While I don't have a very well developed story for this AU, one thing I do picture is that Amelia doesn't become a magical girl for a little while, but does find out about Lina being one pretty quickly and becomes a secret keeper + constantly tries to give Lina advice.
Magical Girl Amelia! The design definitely needs work but it'll do for the time being. :V
Sometimes, raising your great-grandson requires difficult conversations.