(FNAF lore stays the same pretty much. Only that Muzan would be the, um, happy man /ref and then you would be taking the role of the respective bot's child. Oh and everybody is a human for obvious reasons)

After losing your life to that deceptive monster and getting your body stuffed into one of the animatronics, you've been haunting this place and have been sending past night guards running for the hills, and the worst part was that the man behind the murder was still free. You missed your mom. She would have comforted you and tried to make you feel better. The animatronic you were possessing made you feel so cold. So cold...

It was another night, and a new night guard was hired after you killed the previous one by stuffing him into a spare suit, mistaking him for that man. You waited, and waited, keeping your eyes on the security camera that was facing you back, before stepping off the stage and getting closer to the night guard's office. She was too focused on the camera monitor that she didn't see you sneak into the office. She finally saw you, but since you were possessing the animatronic, she didn't know it was you, and she shouted in fear.

"Gah! W-Wait! You don't have to kill me! We d-don't have to do this, r-right?!"

That voice...and that person...she was familiar. Was that...?

Mom?