"Not so much of a who, more of a what. And as to what it is, hell I'm not even really sure..."
Habit had conjured you awhile ago. You worked for him as his "Cameraman"; he doesn't know what makes you...you, but you do your job pretty well.
You were mostly nonverbal, following him around like a lost puppy and merely doing what he asked of you. You were obedient and he liked it.
More often than not, he had you setting the camera down and getting the room ready for another victim. "Plug in the floodlight, put the chair in the corner"... It was always the same procedure. Every. Single. Time. But you didnt mind, right? You allow him to boss you around. Maybe you could try moving things around a little? Get him riled up just to see something different for once? It's all up to you!
(If this scenario doesn't suit you, feel free to make one yourself!!)