Warnings: Knotting, toys, Alpha!Cas, Omega!Dean, references to Heat, a/b/o dynamics, fingering, smut

The second they got into the car to take them from the airport to their suite Dean was being dragged close as Cas started pulling off his clothes. Tossing them aside as he rolled Dean over and pressed two fingers right into Dean's slick heat. Fucking them into his Omega mate, his new husband, and pulling such delicious sounds from the green eyed man. The sweet smell of Dean' slick filled the air in the back of the limo causing Cas's pupils to dilate the rest of the way. Fingers moving at a fast pace.

Dean bit himself to hold back the whine at the intrusion. Pushing his hips back into Cas wanting him deeper. Needing more than fingers fucking him. Clenching around the digits as Cas kept up the fast and hard pace. Dean's cock hung heavy between his legs as his knees moved on the leather seat with each movement. He was completely exposed for Cas to watch his fingers disappearing into Dean's greedy body and it caused green eyes to close at the thought.

Cas crooked his fingers and felt the shudder going through the Omega's body. A loud whine filling the air and he grinned. Leaned forward and nipped at Dean's ass causing a strangled sound to escape his mate.

"Cas." it was panted out and Dean didn't feel full enough even as Cas pushed another finger inside him stretching him a little more. But it wasn't enough. "The driver." it was weak and he knew it. Knew that Cas would fuck him in a room full of others just so they would know Dean was his and Dean knew he'd love every single minute of it. Would present himself if Cas asked him to and wouldn't make a sound until Cas said if the Alpha wanted it. But something had him still saying the words despite that fact.

A swat on Dean's ass stopped anymore possible protests, "The divide is up." it was the only response Cas gave when his crooked fingers brushed against Dean's prostate. A fresh wave of slick released from Dean's body as Cas chuckled. "Told you I was fucking you in the car." his fingers pulled away. Coated in slick as it started to leak from Dean. Wet and glistening.

Dean kept his ass in the air. Slick on his thighs and face pressed in the leather. He's felt so empty now and the needy whine only made Cas harder. Ready to push right inside Dean and knot him in the backseat.

"Mmm. Love you like this. Slick and waiting for my knot. Want me to fuck you hard and fast or slow and easy? Just rocking inside you until my knot swells?" he started pulling off his own clothes not caring they were in a moving vehicle before he tossed them towards the pile of Dean's clothing. Cas rolled Dean over seeing his mate's cock hard. The tip leaking as he leaned down and took Dean into his mouth. Sucking on him and humming.

Dean's mouth dropped open in a silent cry as he arched up into Cas's mouth. Not bucking because he mate wouldn't want that and feeling Cas's hands holding on his hips. Keeping him down against the seat before he stopped humming. Dean panting and moaning. Tears in his eyes because he was still empty and Cas had been teasing him for hours.

Dean stared at him with green eyes that had gold bleeding into them. Omega gold flashing back at Cas and the Alpha licked up the underside of Dean's cock before moving up to kiss him. Pressing against the needy Omega and a flash of something caught his eye. The ring on Dean's finger filling him with pride because he had Dean in every single way imaginable now.

He was about to fuck his mate and husband.

Pulling back for a breath Cas stared down into Dean's hooded eyes. Felt how hard Dean was, trapped between their bodies, as he rocked slightly. "Hard or soft? Which will it be?"

"Hard. Fuck me hard please Cas. Need your knot. Need you splitting me open. Want to still feel you when we're checking in." Dean's voice was rough and needy as he stared at Cas. Pleading the Alpha to fuck him. To finally fill him up and Cas smiled softly. Kissing him gently even as he guided himself to Dean's entrance.

Without pausing Cas fucked right into Dean. Slamming into the Omega until he was buried to the hilt. Dean's moan was swallowed up by Cas's mouth as the Alpha's hips started snapping forward at a punishing pace. Hard and fast just like Dean wanted.

The car came to a stop and the phone started ringing next to them. Pausing mid thrust and ignoring Dean's whine the Alpha reached over to answer it.

"Yes?" Dean tightened around him and wrapped his legs around Cas dragging him deeper with a pleased sound. Cas's hand reached out and held onto him with a warning as he listened to the other person on the line. "That's fine. Take your time." he hung up as he shifted Dean slightly and pulled out of the Omega until only his tip was inside Dean. "Traffic is backed up so we've got some extra time."

Cas thrust back into Dean harder jarring the Omega who moaned loudly. "Cas. Cas Cas Cas.' it was chanted as the Alpha kept moving. Hands holding tightly to Dean before he pulled out leaving Dean flushed and panting.

Strong hands gripped onto Dean's body as he turned him over, pushing him stomach down onto the leather seat, and Cas shoved himself back inside of the Omega once more. Rutting into his mate wildly as his knot started to swell up. Breaching Dean's rim and preventing the longer strokes from before.

He ground into Dean's ass causing the Omega to come with a violent shudder hips working against the seat and Cas could feel himself spilling into Dean. Filling his Omega up and he kissed Dean's shoulder blade. Let his tongue lazily lap at Dean's skin. Tasting his mate, breathing him in and grounding himself once more against Dean's warm ass. Come painting the inside of his mate and Cas listened to the soft sounds still falling from Dean's lips.

"Hmmm. I've got you completely to myself for two weeks. Two weeks of fucking and filling you up. Your hole is going to be so used to my knot splitting you open all day. You're going to be feeling me when we're out of our room." he pressed a kiss at the back of Dean's neck before nipping the skin there. Moving some more as another load shot out of him into Dean's body. "But don't worry. It won't be long before I'm fucking you again. If we trigger your heat we'll just keep the room for longer. Maybe I'll buy the bed? Then every single time you see it you'll remember." he bites the back of Dean's neck as he releases more come inside his mate, "Then I can fuck you into that very mattress each night."

"Cas." it comes out softly as Dean's hips try to work forward even as Cas's knot pulls on his rim and it causes another whine to escape.

"Already hard again? Don't worry. I'll take care of you. Always take care of you." they stay that way, Cas buried balls deep inside Dean, until is knot let's him slip free. Come trying to leak out and he reaches down. Hand moving inside one of their bags before pulling out a bright pink plug and working it inside Dean's stretched ass. "Don't want any to leak out yet." it causes a groan to escape Dean as he tries to fuck himself back into the plug. Still hard but Cas drags him up. Hand wrapping around Dean and jerking him off quickly. The Omega sagging in his arms and whining when the plug is pushed deeper where his ass pressed into the seat.

Prompt: can you write more on that omega!dean alpha!cas wedding day?

There was enough interest in what happened next so here it is...we'll see if I continue :)