That's weird it was posted there..... Anyway, the prequel is posted on mibba as well. Here's the link if you're interested! :) -----> http://www.mibba.com/Stories/Read/483234/Seize-Control/
There's a prequel to Fate Misunderstood if you want to read that to get the backstory of Juice and Juliette! Also, do mind if I ask where on tumblr you found it? Thanks for reading! :)