It has come to my attention after reviewing my story that I have already had Sam discover the amulet and reveal its story to Priestly. Oops! So the following is a revision of the earlier chapter when that happened as they showed Priestly the Impala for the first time.
Priestly looked at the shelf of the back window, finding two sets of initials carved there: DW and SW.
"We did that when we were kids," Sam told him.
"And which one of us did that?" asked Priestly, pointing at an army man crammed in the ash tray of the door.
Sam chuckled. "That'd be me. But you did this." He nodded up at John, who sat on the front seat and turned the car on.
John flipped the heat on, and a rattle started up from the vents.
Priestly frowned. "What the hell is that?"
"Legos that you shoved into the vent," said John.
Priestly listened to the Legos rattle in the heating vent as he stared at the army man in the ash tray before looking over at the initials carved into the car. He thought back to Sam calling him Dean in his excitement, thinking he was getting his brother back.
"You know what?" Priestly said, looking over at Sam. "I'm still going by Priestly, but…you guys can call me Dean if you want."
Sam and John smiled warmly, looking pleased at this small victory.