You got it!
Brothers Remembered has Sam and Dean separated in childhood, Dean barely managing to push his younger brother out of the way in time to avert the curse, but get caught in the blast himself. When, years later, another kid gets snapped up, what’s Dean to do but take him in and teach him to survive?
Since Dean is an adult when he finds Jacob, he takes him to his shelter and nurses him back to health, and helps the kid adjust when he wakes up. They occasionally talk to Walt and Mallory, but by and large Dean and Jacob are independent of the others.
Naturally, shenanigans happen when Sam stays overnight, suspecting none of this.
There was some keys tossed on the nightstand, and a shadow that passed by the vent, its owner out of sight. Dean’s eyes tracked the hulking shadow, enough to eclipse him and everyone he knew at the motel without a problem.
Then, the shadow’s owner came into view and Dean had to restrain himself from leaping back.
This human was big.
The guy might be the biggest person Dean had ever seen. Standing so tall that the vent was only a few scant feet above his head, his hair was longer and fluffed out at the sides, showing signs that he’d just gotten in and had no time to recover from his drive.
A classic road tripper, if a little young. Dean had an urge to cut that long, floppy hair that he couldn’t explain.
The human never noticed him up there, perched above the vent, but that was enough for Dean. He didn’t want to mess with a person that big, tired from driving or not. Whatever supplies this guy had, he could keep. Dean would run through the room after he checked out of the motel for good.
Hitching up his duffel, Dean turned toward home and left that room behind.