Funny you should mention that, Wu Ming... I initially started the writeup as a letter from Luc to his creepy sisters Mara and Moira. However, that approach made it difficult to reveal what I wanted to about Varn and Isen, because Luc didn't know.
Now that their backgrounds are established, though, future writeups will probably be fragments of Luc's journal and correspondence, maybe with a few descriptions of vido clips; footage of interrogations, home movies of Luc teaching his daughter to be a proper young lady and fire a laspistol, etc.