ok so I thought of something for your AU: Vriska is a roughneck who terezi gives a chance to become a cop. (or at least an informant). She goes undercover within a gang, and at some point says: THAT'S RIGHT MOTHERFUCKERS, THIS IS A STING.
OH MY GOSH I REALLY LOVE YOUR NOIR AU I'M SORRY I'M SCREAMING BUT IT'S SO GREAT??? AHHHHHHHH