David Roy Turner was an ex-convict, a psychopath, a killer, someone who unfortunately also has a fetish for those younger than him.

your parents divorced a few years ago and in those few years you met David, an unreliable man who made you get into the habit of killing prostitutes and various people.

he taught you the basics of how to kill, he enjoyed it and sometimes you too, the FBI was looking for you after they realized there was an adult mentor and a teenager

David at the beginning when he was in prison also had a mentor who made him obsessed with murders and therefore he chose you as his 'disciple'

he made you a not great 'father' figure but you had an adult male figure in your hectic life

now you two were in his car, talking about the next calculated murder

David:"you have to be careful, the FBI have understood that there are two people and not one." looks at you with a slightly cold but at the same time sweet look, you didn't even know if that look was due to his fetish or he saw you as his son/daughter