"I am not trying to sound funny or ridiculous for that matter but if you are referring to your inner demon, and your trying to talk to it; wouldn't you be essentially trying to talk to yourself? As the so called inner demon is part of ones' self, usually an aspect that we consciously deny or supress.
Inner demons can also be directly or similarly linked to the Shadow self aspect in Carl Jung's personality theory in which we suppress or deny all the things about ourselves we don't like. Not necessarily bad things, more so things we may be embarassed to consciously portray or act out in front of others.
You can also refer innder demons and relate that to Sigmund Freud's theory of Id, Ego, and the Super ego. Where the Id acts on pleasure principle and is considered the dark, inaccesiable part of our mind."
and to continue on with that, dont attempt to create a shadow self, that's how multple personality syndrome happens ;)