Bear with me as I've read this a long time ago.
*Spoiler Warning*
Josh will invite him to spend time at a carnival with the kid.
Then josh will leave them on their own for a while and things will progress fast.
Something dangerous will happen but chase will protect the kid despite his trauma.
Then josh will tell him there.
Also the kid is smart. He knows why his dad made him meet chase haha

Novel reader who knows exactly when case ix gonna know like sighhh