So this is very important. When you see (cue) further down, go to youtube, find Bad to the Bone by George Thorogood and play it.
I don't own Supernatural and I don't own any of the songs mentioned:
Bad to the Bone by George Thorogood
Highway to Hell by ACDC
Fire of Unknown Origin by Blue Oyster Cult
Have You Ever Seen the Rain by Creedence Clearwater Revival
Lodi by Creedence Clearwater Revival
Separate Ways (Worlds Apart) by Journey
Wheel in the Sky by Journey
Cold as Ice by Foreigner
Simple Man by Lynryd Skynyrd
Chevy Van by Sammy Johns
Castiel became human in this fanfiction and has been with the brothers for awhile so its AU.
Castiel had found a new hobby. His newest hobby wasn't reading like Sam or drinking like Dean, it wasn't something completely obvious, like riding a bike, video games, or knitting (as if Dean would allow that). It definitely wasn't shopping- despite that he had asked Sam to take him shopping for the newest (non supernatural) mission he had set his mind on. No, Castiel's newest hobby was listening to music.
But it was a bit more complex than that.
See, Castiel liked putting on the mp3 player the Winchesters had bought for him one Christmas and playing songs while he, the brothers, or all three were doing something. The brothers had done it themselves a few times, actually. How many times had they played Highway to Hell by ACDC in a tense moment? How many times had Dean belted out Blue Oyster Cult's Fire of Unknown Origin to wake up Sam?
Castiel particularly liked playing Have You Ever Seen the Rain by Creedence Clearwater Revival when he was sitting in the backseat of the Impala and Dean and Sam were relaxing. Then Dean would turn to Castiel with a smile that made his heart skip a beat. Then he'd turn to Sam and say something that made Castiel think it was just a fluke before Sam would start laughing and Dean grinned at him through the rearview mirror. Then Castiel would smile back and rest his eyes. He would sometimes wake up in a bed instead of the backseat of the Impala.
"Sam carried you in here," Dean shrugged when asked but Sam held up a hand to block his other one and pointed in Dean's direction.
"He did it. I have pictures," Sam said almost gleefully.
When Castiel was left to himself because the Winchesters went on their own case or he opted to help Bobby with his workload, Castiel sometimes found it enjoyable to play Lodi by Creedence Clearwater Revival. He'd wait for the black Impala to show up and come back for him. If Bobby figured that out, he never said anything. But once in awhile, when Castiel was staring at the driveway, Bobby would chuck the phone at him.
"Here, ya idjit," he'd grunt.
"Hello?" Castiel would ask.
"Hey, Cas. I hear you miss me," Castiel could almost see the smirk on the man's face who was on the other end of the line.
"Dean," Castiel breathed, not sure whether to be mortified that Bobby called Dean and told him he was pinning or to hug the man.
When either Winchester was in a bad mood and stormed off, Castiel played Carry on My Wayward Son by Kansas. Eventually, the brothers would come back. Lately, they had gotten into the pattern of talking (in Sam's case) and sitting next to him (in Dean's case) and having a beer together (in both cases) before confessing what the problem was.
"You listen to Kansas?" Dean asked a day after Castiel had gotten his Christmas present.
"When I was an angel I used to be able to hear everyone's thoughts," Castiel said. "But now that I'm no longer an angel, I can't hear people's thoughts... so no, I am not listening to Kansas's thoughts."
When Castiel was in his own bad mood about Dean taking off with another one night stand or just flirting, he'd leave the Winchesters and go up to their hotel room, or the Impala, if the hotel room wasn't close enough. He began blasting Separate Ways (Worlds Apart) by Journey. Sam eventually caught on and when he approached Castiel after he found out, his first words were always, "Journey again?"
"You have to ask?" Castiel would respond.
"Dean's an idiot,"
"I'm beginning to figure that out,"
One time, when Dean had gotten wounded after killing a wendigo, Castiel ran to Dean. His mp3 had fallen out of his pocket and (it had been on the loudest volume he could get it before he had turned it off to go on the hunt) had started playing Wheel in the Sky by Journey. Castiel couldn't remember having ever feeling more relieved when Dean opened his eyes.
"Cas?" Dean croaked.
"Don't you ever do that again! Do you understand me?" Castiel demanded. "If you do that again, I will throw you back into the pits of Hell, angel or not-!" His tirade was cut short when Dean raised a hand to move some of Castiel's hair away from a gash on his forehead.
"I hear ya, loud and clear," Dean said.
When Dean and Castiel were fighting (which wasn't a rare occurrence- they were beginning to fight more than Sam and Dean did), and Castiel was ignoring Dean, he liked playing Cold as Ice by Foreigner. He could be found smiling while listening to his mp3 player and Dean would get pissed off and Castiel would clue Sam into what he was listening to and Sam would share Castiel's amusement.
Of course, there were times when the three hunters needed their alone time after a tough hunt. Sometimes it was Dean. Sometimes it was Sam. Sometimes, it was even Castiel. He played Simple Man by Lynryd Skynyrd. Dean had caught him playing the music and had silently handed him a beer. Castiel smiled with no emotion and took it as Dean leaned on the wall next to him.
"Does it get easier?" Castiel whispered.
"You don't let it get to you after awhile," Dean said.
"You do," Castiel answered.
"Yeah, well, there's always something," Dean said.
There were times, they were rare and few and far between, but there were times when Dean and Castiel were alone. It wasn't romantic. It wasn't brotherly. It was just… them. These times sometimes ended up with Dean and Castiel on the hood of Dean's car, just watching the stars. Castiel's mp3 player had accidentally turned on and started playing Chevy Van by Sammy Johns.
"Sorry-" Castiel said, hastening to turn it off.
"Leave it on," Dean shrugged. "It's not bad." Surprised, but happy, Castiel let his mp3 continue on playing before he lay back on the hood of the car.
Most of the songs were from Dean's music choice. Castiel suspected that Journey might have been more of Sam's doing (because Sam put most of the songs on his mp3 until he learned how to do it himself). There was one song that Castiel knew was definitely Sam's choice but it'd be going on Castiel's playlist if everything worked out all right.
"Are you sure this will work?" Castiel swallowed, looking in the mirror.
"Well, if it doesn't… Dean's an idiot," Sam said. "You sure you want to do this?"
"Too late to turn back now. I already bought the clothes," Castiel said, not minding the black jeans, white shirt, and black military jacket fit on his form.
"Are you sure he's thinking you're innocent?" Sam asked.
"Yes," Castiel said.
"Remind me, what's the plan again?" Sam asked.
"For me to seduce your brother," Castiel said.
"And if it works?" Sam asked.
"Get him to admit he loves me and wants an apple pie life with me," Castiel said.
"If it fails?"
"Not an option,"
"You've been hanging around us too much," Sam rolled his eyes. "You also want a white picket fence and two point five kids?"
"Sam, you can't have two point five kids, its impossible-"
"Okay, I take it back. You haven't spent enough time with us," Sam said. "Same thing with the Impala, Cas. Dean didn't give birth to it. You can't have two point five kids."
"It's… a metaphor?" Castiel titled his head.
"Yes," Sam nodded. "Ready to go catch him, tiger?"
"No," Castiel said.
"I can't tell if you're joking or not," Sam said.
"I'm not," Castiel swallowed.
"You want to wait five minutes?" Sam asked.
"Maybe," Castiel said. "No. Yes-"
"Let's go," Sam said, grabbing Castiel who managed to cast one last look at his trench coat before the door closed.
"Wait!" Castiel said.
"What?" Sam asked.
"I forgot my mp3," Castiel said.
"Seriously? Alright go get it," Sam rolled his eyes. Castiel went back into the motel room and got the mp3, putting it securely in his pocket and walking back to Sam.
"Now let's go."