"Dorian seems to be developing a conscience"
What?

This ^

I think he can be revealed at some point as one of Lucifer's servants. And one day he will have to pay the "favor" back to his master. Perhaps? I don't know, but the link with the Nebratronak (Master) is there. Because when Vanessa was "having fun" with Dorian, Lucifer was able to posses her.