Man, Akechi really does sound like Scriabin in this. I mean not only is he a snarky asshole who lives in Ren's mind (admittedly for a much more questionable value of "lives" than Scriabin) he also does Scriabin-y things like bother Ren while he's reading and accuse him of masochism.
The concept of this fic is very interesting too. It's a little twisted but in sad cute way.