This was completely and utterly inspired by an ask on Clairelutra's blog and her response to said ask. All credit for the basic idea goes to her

Happy Birthday

There was a muffled thud from behind him and Chat Noir immediately rose despite the bitter cold wind blowing across the rooftops. He clutched the little sparkly wrapped cube to his chest and turned with a wide smile on his face.

"Happy eighteenth My Lady!" he called to the (surprisingly unsteady) heroine now standing in front of him only a few feet away.

"Yay! Happy birthday to me!" Ladybug yelled, an uncharacteristically large grin splitting her face as she swayed in place, her yo-yo laying unravelled at her feet instead of tightly coiled like usual. The scent of alcohol travelled to Chat's nose and his jaw dropped in shock.

"Oh my God. Are you drunk?"

"Not drunk! Buzzed! My best friend insisted I try some real alcohol since she's always making fun of me for what I drink. Now I can actually buy real drinks without getting asked for ID!"

Chat wasn't sure he believed her when she insisted she wasn't drunk, considering the way she appeared to be having trouble keeping her footing. Okay, he definitely didn't believe her. And she was only standing, he hadn't even seen her attempt to walk yet.

"What did you drink?"

"A little bit of everything. Then a lot of everything." She giggled hysterically.

"Okay Bug, no patrol for you tonight," he said as he approached her to lend some assistance lest she become vertically challenged, "You need to go home." She pouted in response.

"Don't wanna go home," she whined, hugging into him. He let off a particularly heavy sigh before giving off a shocked yelp as his thoughts were interrupted when Ladybug roughly grabbed at his backside and squeezed.

He reached back and took hold of her wrists gently to bring her hands around to where he could safely keep an eye on them, his expression strained and his discomfort clear.

"My Lady," he squeaked, as she suddenly nuzzled into his collarbone and pushed her restrained hands forward to press against his chest firmly, "What are you doing?"

"I told you I don't wanna go home...unless you come home with me."

"WHAT!?"

"I'm eighteen, Chat," she said, squirming as he delicately tried to push her away from him to gain some distance, "and I'm still a virgin. How sad is that? Most of my friends all lost their virginity a couple years ago and I'm tired of waiting. So...come home with me."

Chat disengaged from her entirely when she rocked up onto her tip-toes to try to kiss him and she swayed forward as he twirled away from her. Catching her balance surprisingly quickly considering how strong the au de alcohol on her breath was, Ladybug turned and looked at him. Her eyes were wide and focused on him. And her pupils were so dilated he was having trouble seeing the blue. And then suddenly she was biting her bottom lip seductively.

All of the blood in Chat's body battled to decide whether to rush to his face or his lower regions.

"Here, kitty kitty kitty," she purred (Chat mentally kicked himself for making a pun at a time like this) and moved towards him, her hips swaying even as her footsteps staggered here and there.

Chat found his back pressed against the chimney behind him as Ladybug closed in quickly and clumsily, her arms pressing into the brickwork either side of his head to trap him in place.

"It's a rite of passage Chaton, help a girl out? Pleeease?"

So here's a quick start to see what people think. I have more written but it needs fleshed out a bit before I post more.