Disclaimer: If you recognize it then I don't own it.

Pairing: Cas/Dean

Warnings: Omega!Dean, Alpha!Cas, references to knotting, a/b/o dynamics, dirty talk

"Deep breaths. Deep breaths." Dean muttered it to himself and tried not to throw up. It isn't that he doesn't want to marry Cas. He loves his mate more than he can possibly explain but it's all those people. All of them staring at him and taking pictures and whispering while he walks past.

He just wants Cas. Just wants this whole thing to be done and over with because he's been Cas's since the Alpha first laid eyes on him years ago when they were children. Dean had known that if he was ever going to have a mate, belong to an Alpha, it was going to be Cas. Cas who treated him like an equal, who stood too close to him and who baked him pie for his birthday. Cas who had gotten down on one knee. Stared up at him with those blue eyes and asked softly, "Will you marry me?" voice full of emotion and love.

Cas didn't have to ask. Could have just taken what he wanted and Dean wouldn't have had anything to say about it. Alphas could do that but not Cas. Never Cas because he was different. He fucking cared and loved Dean. Treated him precious instead of just another Omega bitch that he could fuck and knot and breed as he pleased.

Green eyes flashed open and Dean moved through the door after seeing the signal telling him he could head down the aisle. Every single eye in the place turned to watch him. He could feel his cheeks heating up and Dean swallowed down some of his nerves. Kept putting one step in front of the other until he heard something coming up the aisle.

Dean paused in his walk as his niece raced up to him clutching flowers in her hand. Without a thought he dropped down to scoop her up into his arms. "Hey Elle." he murmured as she pressed her face against him. Little arms hugging him tight as the flowers brushed against his neck. "What's wrong?"

It didn't matter that it was the middle of his wedding, that Cas was waiting for him up at the alter or that everyone was staring at them. Elle needed her Uncle and Dean could take a moment to see what was wrong.

"I made this for you." her voice came out in a loud whisper as she pulled back in his arms and showed him the flowers.

It was a crown of blue flowers with lush green leaves. They were woven into a perfect circle and he watched her hazel eyes light up as she presented it to him. "They remind me of Uncle Cas's eyes and yours." she smiled widely and Dean felt his whole body warm up with love. With affection as she carefully moved to place it on his head.

Little hands held tight to the crown as Dean bowed his head and let her place them there. She pulled back with a satisfied look before leaning forward to kiss his cheek and nuzzle close once more.

There were sounds of people murmuring, flashes of cameras and words catching his attention.

Cute.

Precious.

Adorable.

He'll make such a good parent.

His mate is so lucky.

But it was Cas who was smiling softly at him. Affection and love shining out that mattered most as he started moving down the aisle. Still holding onto Elle who was content to stay in his arms. Breathing in the relaxing scent of her Omega Uncle who held her protectively.

Sam stood waiting for him and took his daughter with one arm. Effortlessly moving her around until he could pull Dean in close for a hug. Letting him go and then Dean was moving up to stand in front of Cas. The only thing that mattered now was that he was there. He'd made it down the aisle and Cas was waiting for him. Smiling and proud. The scent of his mate's happiness causing the remaining tension in his body to melt away.

He barely heard the words being spoken. Listened to Cas and forced himself not to cross the distance because he really wanted to wrap himself up in his mate. There was a pause that only caught his attention when Cas grinned at him amused and he flushed again. Dean opened his mouth to respond, a few more words spoken and then they were kissing. Cas was warm against him and the smell of his Alpha filled his senses. Taste, touch, smell, touch and sound as Cas let out a low moan.

When they broke for air Dean couldn't stop the stupid grin from taking over his features. Saw the matching one on Cas's face. "I love you." he had to say it. Didn't care that everyone was cheering, taking pictures and if his ears weren't deceiving him he thought there might be a few crying.

"I love you too, Dean." Cas breathed it out and dragged him closer. Burying his face against Dean's neck, "Mine. My perfect mate."

They finally turned towards everyone as they were announced and Dean saw his brother grinning widely at him. His mate, Jess, leaning into his side and holding their daughter. As they started walking down the aisle Cas leaned close and huffed out a laugh.

"I love the crown." he murmured and Dean felt his cheeks heating up. Aware of the weight resting on his head and how that weight was flowers of all things.

A flower crown.

He opened his mouth to respond and met Elle's eyes. Saw how happy she was and he bit back the original response, "Thanks. It matches our eyes."

Cas's fingers laced together with his and the Alpha squeezed his hand briefly. Glancing sideways he can't help the mischievous glint in his blue eyes, "It can match your eyes while I fuck you into the mattress tonight."

Dean choked at the words and his footsteps faltered as he turned wide eyes on Cas. Prayed that no one could smell what he was very sure is arousal filling the space between them. They continue on, going through the motions, on their way out the door. People are lined up outside as they walk to the limo waiting, because Cas spared no expense on the event, and Dean is trying to focus on not dragging Cas closer.

But the second they're in the car heading towards the reception he feels Cas drag him into his lap. Their erections rubbing together and he whines. "Dammit Cas. I want…" he trails off as Cas bites at his neck even as he holds tight to his mate. His husband.

"Don't worry." it is breathed out against Dean's warm skin, "You get through the reception and I'll have you full of my cock all night long. I'll take you in the backseat of the car on the way there, against the wall, in the shower, on the floor, bent over every single available surface and when you think I can't possibly go one more round I'm going to fuck you right into the mattress." he bites down again as Dean whimpers against him. Rocks forward seeking friction, "Every single day. Maybe we'll trigger your heat and I'll knot you up. Breed you full and then we can have a little one of our own."

"Yes. Want all of that Cas. Dammit." he's hard. They're both hard and they're about to be stuck surrounded by friends and family before they can leave. "Can we just skip the reception?"

"No." Cas pulls back and grins. "I want to dance with my new husband."

Dean whines again and closes his eyes. Tries to calm himself down even as Cas drags him closer. "Cas." it comes out softly as a hand rubs his back.

"My beautiful little Omega." the Alpha presses a soft kiss to Dean's lips as the car rolls to a stop.

Written for the prompt: How about omega!Dean and Alpha!Cas' wedding day? Never really read anything like that before. Like, maybe Dean is all nervous/embarrass on walking down the aisle to the alter, towards Cas. And Cas is just waiting and smiling at him. Oh, and maybe Dean wearing a flower crown and feels silly but someone made him wear it. It'll be up to you on that part.

And yes...I do take prompts on my tumblr. Just type in my user name here and it will redirect you to the correct place (since I currently have a themed URL).