My little demon is the quintessential reluctant obsessor's song. I liken it to the Police with the song 'Don't Stand So Close to Me', but that would have been far too easy for me to include. I like this song much better because it captures a certain sense of creepiness, which is definitely present in the story.
For you foolish ones who are wondering, this song would be from Harrison's point of view.

My little demon, comin'on down.
My little demon's turnin' me around.
all of my friends keep on tellin'me
that I just ain't the man I used to be.
I really don't like it...ain't nothing I can do.
I really don't like it...I'm leaving it to you.
My little demon, making me choose.
Making me an offer I can't refuse.
Hard as a rock,dry as a bone...
Big or little,know that I will take you home.
I really don't like it...ain't nothin'I can do.
I really don't like it...I'm leaving it to you.
Why try to hide it?
Fight it...fight it!
I really don't like it...ain't nothin'I can do.
I really don't like it...I'm leaving it to you.
My little demon is coming after me.
My little demon...
It's all that I can do to keep that little demon...
To keep that little demon...
Just to keep that little demon away from you!

run away