Actual headcanon that started all this mess:

I think that when they're going to be married, once Marinette walks down the aisle, Adrien would be a crying mess because Mari's just really pretty and that he feels very very lucky to have her and he'd just be crying even more than Mari and her parents, probably. Hence the story title, Cry Baby.

•••

Call him a nerd because he loved Physics, he wouldn't care. Call him a dweeb for loving his videogames more than his modelling career, he wouldn't be bothered. Call him cheesy for the cat puns, he'd just shrug and shoot you one. But call him a cry baby? Well, he couldn't deny that.

Adrien stood at the altar waiting for Marinette to come around. It hadn't been an hour since he last saw her, actually. It had been about fifteen minutes since they finished their wedding at the City Hall and Marinette had gone back to the hotel to change her dress, claiming that she didn't want him to see her actual wedding dress until the ceremony.

The wedding had been a Gabriel and a Dupain-Cheng original so it was pretty special for the bride who still fangirled over her future father-in-law.

Everything fell perfectly in place and Adrien could sigh in relief. He was officially married to Marinette, that was great, that was awesome. He loved her so much and cared for her and she did the same to him and more. So much more that Adrien couldn't bear the thought of losing her.

His Princess, albeit him still not admitting and confessing who he was at night and during battles, was going to be married to him and they would live happily ever after with one thousand babies and they'll ride unicorns to the sunset. Perfect ending.

The organ started playing and the doors opened slowly, blinding him with the bright light at first before his eyes fixated on his bride. He couldn't help but smile so wide at the thought of her. She was so beautiful, not that she wasn't beautiful before but she looked like an angel now. She looked like she floated in her dress. Marinette looked absolutely stunning and all eyes were on her.

And her eyes were on his and his only.

He held a hand to his heart, feeling it palpitate a tremendous amount per minute. He couldn't help but gape at her. She was beyond beautiful, transcendent. For a black cat, he was lucky to have been the person this beautiful and charming and nearly perfect woman wanted to marry.

And that when she finally arrived at placed her hand on his, he couldn't help but cry, burying his face with his free hand. Marinette chuckled weakly and rubbed his arm.

"You're so beautiful." He sobbed then enveloped her in a tight hug, "So perfect. I love you."

Marinette smiled weakly, "Thank you, Adrien."

She wioed his tears away and he placed a sweet kiss on her forehead.

"I'm so lucky to have you." He whispered, leading her over to her seat

"I'm luckier, mon cherie." She wrapped her arm around his, resting her head on his shoulder, "Have I told you that I love you, Mister Agreste?"

"Have I told you that I love you even more, Missis Agreste?" He grinned

"You couldn't have said it any better." She responded

•••

Extra scene just cause. So I was researching on Traditional French Weddings and well…

Finally, on the newlyweds' wedding night, a crowd of their friends would interrupt the couple as a prank called chiverie by clanging pots and pans. The bride and groom were expected to then provide treats and drinks for their guests before they would finally leave them alone.

( ͡° ͜ʖ ͡°) you know they would

Adrien and Marinette plopped down on their bed after a long day. Honestly, they couldn't dream of doing anything else than to sleep, everything else could be reserved for another day when they weren't half dead. Adrien threw the necktie that had been choking him all day long to the floor. He breathed in relief to finally have freedom to his windpipes. Meanwhile, Marinette just watched him do so, knowing that removing the dress, if she wanted to keep it in one piece, would take her some time and a lot of energy.

"Can I just sleep like this?" She yawned, getting comfortable in her side of the bed

Adrien turned to her and pulled her close, hugging her and burying his face in her hair, "Mhm."

The two laid down in silence, almost at the peak of consciousness and unconsciousness when…

Clang! Clang! Clang!

Both pairs of eyes shot up and jumped up, used to the sounds of things being destroyed through years of superhero business.

"Tikki where are you?" Marinette's sleepless self almost yelled

"Plagg come on!" Adrien shrugged his coat off to let out the Kwami

The newly wedded couple turned to look at each other, wide eyed, then turned to the floating black Kwami.

"Hey." Plagg raised a paw, casually greeting Marinette, "Honestly were you going to keep me from her for the rest of your life?"

"Wh-What is that?" Marinette asked, turning to Adrien with bewildered eyes

"I-, an action figure!" Adrien blurted out loud

Plagg rolled his eyes, "The name's Plagg, a Kwami, but you should know that. I know I don't exactly look like Tikki but, you know."

"Tikki? Who's-."

"Way to go about hidden identities." A small voice came from Marinette's bouquet then a small red thing emerged from it, "Hello Adrien, I'm Tikki."

"Pft. Yeah. They should've actually told each other sooner." Plagg stated

Marinette groaned, "Okay I can't talk with all these sounds."

She marched out of the room, grabbing the small backpack at the corner of the room. She gave the bag to her traitorous friends who had the nerve to pull this off at their wedding night then went back to her room, only stopping at the door. Her eyes widened in realization.

Adrien has a Kwami. She has a Kwami. She's Ladybug because she has a Kwami. Then that means…

She pulled open the door, "I married you, Chat Noir!"

•••

Nah don't worry that isn't a violent reaction. She's just tired and figured out she married the guy who's been hitting on her for years.