Um, I'm not entirely sure if this is allowed, so you guys are all allowed to yell at me if it is not. I've posted this before, but it fits this challenge so perfectly that my mild OCD psyche cannot resist putting it into its proper box, if it is allowed.
The original AU is
Vigilante. It is somewhere around 80 K long, and is RayK POV gen. Rated R for general disturbingness.
The sequel (because AUs have a tendency to breed) is
Visiting Hours. ~40 K, also gen, set not very long after Vigilante, with Fraser POV. Refers to Vigilante a lot, so it's also probably something like R for disturbingness.
Again, please let me know if this is inappropriate; general feedback on the story appreciated too, by the by. *g*