Anya's 'big' sister

This story contains mature language, mild gore/ violence, underage drug use, and age regression; if you don't like it, don't read.

Kamiko has been Anya's honorary sister for as long as they've known each other, but now they're given the opportunity to become real sisters by... a spy? Lloid Forger- or Twilight - is the best spy in Westalis, and when he's chosen for Operation Strix, he needs to have a family. He chooses an assassin for his wife and two children with superpowers, can't get much more normal than that. It'll be difficult, but he should be able to handle it.. right?