The Story and Timeline of Five Nights At Freddy's (And the fanverse)

About Midnight Motorist

Midnight Motorist is a mini game in Fnaf 6: Pizzeria Simulator

The story of the mini game most likely is about William Afton driving home after murdering Charlotte Emily

William goes to two places before he drives home

He first goes to a bar where someone tells him that he shouldn't be here, probably because he was kicked out

Then William goes to an unknown area where there's a pile/mound of dirt near the trees

William drives home and heads inside where someone (His wife or Henry Emily) tells him to leave his kid alone because he had a rough day

William ignores them and yells at his kid to unlock their door but there’s no answer

He goes outside and around the house to discover that his kid broke the window and ran away somewhere

William tells himself that his kid will be sorry when he gets back

There has been theories regarding Midnight Motorist but most of them are the same thing

Midnight Motorist is most likely about the Afton Family and that Michael is the runaway

Michael Afton being the runaway makes the most sense

And for the Crying Child to be the runaway doesn't make sense because he's obviously a crybaby and even though it is a thing for children at a very young age to runaway

Due to the Crying Child literally crying and being scared almost unable to do anything, he probably wouldn't runaway

The person on the couch watching TV is probably Mrs. Afton or Henry Emily, Michael's grandparents, but who knows

As for the mound of dirt, it's definitely not a grave

It's probably the beginning foundation of a house being built or something...

Update: The mound of dirt could technically be a grave but a burial place for Michael's guilt, burying a literal locked box containing his memories of what he did to his younger brother or his Foxy mask