Okay so I know I never really said much about this AU, I only really said that bobby and Charlie are alive. And Kevin is too ( he lives with his mom)
It's kinda like the SPN world we're they hunt monsters but it's not super complicated. Also they have Crowley in their dungeon rn ( that's important for this part).

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SMUT WARNING! yes I finally write some more smut instead of just fluff and BOI it spicy!
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Dean & Castiel we're walking through the bunker, Crowley was in chains beside them, his head covered by a black cloth. "So what are we doing with Crowley again?" Cas said, breaking the silence, "Bobby said he wanted see him, ask questions or something."
"Why didn't he just come to the bunker?"

"Maybe to get away from you sexual tension seething maggots." Crowley mumbled behind them, Dean huffed at him before saying, "he said the ride was to long or something, I don't remember."

He yawned half way through his sentence and looked almost drunk, "you really need to get more sleep Dean."
"I'm doing fine Cas, just a little tired."

The ride was quiet and long, the only thing you could hear over the loud rock music was Crowley's complaining. "Can you shut up!" Cas growled from the passenger's seat, it was the first time anyone but Crowley said anything the whole ride. "I will when I so damn please!"
"Hey! Hey! Calm down you two, we've only got a couple hours left."

"I still don't see why we have to do this, couldn't he have just came up to the bunker?" Cas was speaking mainly to Dean now, completely ignoring the mumbling king of hell.
"Like I said I don't know Cas"

" maybe he just wanted to have some 'alone time' with me huh? I see why that could be uncomfortable in the bunker, all that cold metal and chains. Sounds like fifty shades 2.0"

"Shut up Crowley!"

"Nevermind there's enough of that in Sam's room when Gabe comes over."

"Gabe? Really?"

"Oh yeah, they have a hell of a time up there."

"Wait, how did you even- "

"Vents, Dean... vents..."

Dean felt a shiver up his spine as he thought about it, Gabe? Really Sam?

While Dean was busy being mortified Cas was playing with the radio, trying to find something a little less ' loud'. There wasn't much for stations in the middle of no where, the only one he could find was the 'lover's station'. A steamy sounding song started playing, Dean bobbed his head a bit and tried mumbling the words but he didn't really know them.

Cas started imagining a more romantic scene in his head, one where they weren't trapped in a sweaty car with the king of hell breathing down their necks. He thought of their date about a week ago, how it felt to be in bed with Dean, how hot it was.

Before he knew it he was sporting a boner, but this boner was like no other. It was the boner to end all boners and he just couldn't handle it, Cas quickly covered it with his coat and held on to the side of his seat. His face was beaming red.

Dean soon noticed and gave him a concerned look, "You okay Cas?" Dean placed a hand on Cas's leg, making it 10 times worse. All he could muster out was, "mmhm..." his eyes giant and his face looking like it was about to explode, Dean then saw what he was hiding and instantly felt queasy. Before he knew it he was in the same place as Cas, face exploding and Dick throbbing for air. "Ffvfuck." He said and he stared deeply in Cas's eyes.

They pulled over on the the side of a highway, "get out!" Dean yelled at Crowley.
"Mcsqueeze me?"
"I said get out." He gave him a rude glare as he exited the impala,
"Jeez your feisty."

Dean quickly drew a devil's trap and dragged Crowley in the middle, "try to leave I'll kill you."

"Sure you will sweetheart."

Dean got back in the car and to his surprise was greeted by a horny Castiel laying back against the opposite door, waiting for him.
He instantly slammed the door and started kissing Castiel, he kissed back and started leading them towards the back seat.
Cas pulled away, he could tell Dean was annoyed but didn't care and started slowly sliding off his trench coat. Trying to be seductive he bit his lip, he bit to hard though, making him squeal at the pain.

"Getting saucy in there I see, all that fifty shades talk really got you inspired."
"I will kill you Crowley!" Dean growled from inside the Car, "Dean and Castiel sitting in a car, F-U-C-K-I-N-G!" He teased.
They both blushed intensely.

Cas continued sliding off his trench coat until he was left in just a white long sleeved button up, matched with a black tie. Castiel attempted removing the tie but failed, somehow making it double knotted. Dean sighed and started undoing it for him, this 'romantic setting' really wasn't living up to his expectations.
When the tie was undid Cas kept with his seductive sliding off with clothes thing, unbuttoning the white long-sleeve. When Dean saw his chest he instantly started kissing him again, he just couldn't wait for Cas to finish undoing it. Cas placed a hand on his neck, sliding his fingers into the blonde strands.

Dean pulled away this time, he pulled off his shirt and the rest of Cas's. Their chests pressed together when he reunited their lips.

Dean started palming him through his jeans, making Cas moan loudly in between kisses.

Cas caught this eyes for a moment, they shimmered from whatever light was coming from the sky. Dark green circles full of lust.

Dean lowered his head and started sucking on his neck, before he could really leave a mark Cas pushed him down towards the other side of the impala. He kissed down Dean's face, to his neck then finally reaching his waistband.
Castiel played with Dean's zipper for awhile before sliding down his jeans and throwing them aside, he then 'seductively' took off his boxers.

Dean pulled him closer, kissing him harder now. "Fvffu-fuck!" Cas slid off his jeans and his boxers in one go, and propped himself onto Dean's legs. He took a deep breath before taking all of him in, he moaned extra loud this time, leaning over and dropping his head into Dean's chest.

He kept going up and down, driving both of them crazy. "Cas!" Dean yelled as he pushed Cas down onto the seats, he was grinding into him now, their breathing loud and unsteady.
It didn't take That long for them to get close, Cas was moaning every five seconds and Dean was swearing every chance he got. When Cas finally came he screamed so loud it sounded like the high pitched scream Dean heard when they first met. The scream filled in entire impala and left a ringing in Dean's ears for a while.

Dean was pressed up against Cas, the only thing in between being Deans elbows on either side of Cas's head. A sticky white liquid was sprayed against their chests.

"Fuck Cas.." his breathing still irregular, "didn't know you could scream like that." Cas blushed slightly, "I didn't know I could do that either" he laughed softly and helped Dean clean up the mess.

When they were fully clothed again Dean opened the door to see a smirking Crowley, "shut up." He growled as he cut the red devil's trap and pushed Crowley back inside the car. Cas was already in the front seat waiting for him.

"And I thought Sam and Gabriel were loud." Crowley mumbled behind them, "oh you have no idea." Cas grinned and turned up the radio.