Forward two weeks of tiptoeing around their attraction towards each other:

Adrien was torn, he loved his Lady very steadfastly and now he noticed how his attraction to his princess was growing. Marinette made him feel the way he did with Ladybug, he just knew her better and his imagination immediately jumped to them being in a relationship.

With his Lady he realized his idolisation had fuelled his love a big amount. She was simply so amazing! But Marinette was his friend and he wanted to keep her around forever but even closer than anyone else.
He paced his room after another Mari induced panic. She had walked out of the bathroom in only a towel. In nothing but a towel!

"Plagg, Claws out!" He needed some time out and nothing worked better than to run atop the roofs of Paris.

At the same time though Mari had been feeling something akin to loss. She didn't really understand why, she still saw Chat every other day while fighting and they bantered like always. He just hadn't been visiting very often. Maybe it was because of Adrien living with her but she had stayed in her room a fair amount of time at night to show she was alone.
Adrien was perfect though. He tried his best at house work, listened to her when she explained how she liked things done and in general was very pleasant to live with.

He did keep a startling amount of stinky cheese and she was almost tempted to make him buy a second small fridge just to keep that smell out of the big fridge.

She was torn. She loved Adrien but the cat had sneaked his way in as well. She had noticed as soon as he didn't visit her anymore.

Tikki was not concerned:

"Mari, you are a young woman, a smart one and very talented and dedicated. It makes no sense to beat yourself up over some men. You will notice soon enough. Don't worry, if you someday manage to really ask Adrien he will fall head over heels for you, I am certain."

Tikki grinned behind Maris back and thought back to her first rendez-vous with Plagg and the realization who the superheroes were without the mask.

"Argh, I hope he is out today, I'll just see if I can talk to him as Ladybug. Spots on, Tikki!"
Quickly flying into the night air over the next two houses and settling on an old favourite of hers she picked up her yoyo to call the feline friend.

Just as she was about to dial a black shadow jumped in front of her and came tantalizing close.
Sitting directly in front of her, with his brilliant green eyes and adorably tousled hair she used every ounce of self control to not just lean forward and kiss the kitty.

She had accepted her heroine persona a little more but still believed Chat just loved her for what she wore as a mask.

He was just too adorable for his own good, so she booped him on his nose and giggled.

He purred loving the sound of her giggle and made a show of sitting next to her, feeling cuddly and laying his head in her lap.

"Hey silly kitty. Something up tonight?", he shook his head and purred loudly as she started scratching his scalp.

"My lady, if you keep that up, I will not leave your side ever. And no, there is no akuma terrorizing anyone tonight."

Mari flushed a deep red, quite close to the shade of her mask and was very relieved that her partner wasn't looking at her closely.

He was replaying that little sound of her giggle in his mind. His lady seldomly giggled. She was a happy person but they had a lot of rather unhappy encounters with Akumas. So of course he wouldn't have heard this very often. Somehow it was more important, more amazing now.

His Lady began a tirade about this stinky cheese that her roommate was keeping:
"I swear it seems like the guy eats this stuff for breakfast, lunch and dinner! I think I need to get a second fridge just for the stuff. Everything smells by the end of the day."

He coughed into his hand. That was a weird coincidence how many people liked that stuff?!

"Well my lady. I would maybe try for something less expensive first? Like tupperware?"

She just hummed in acknowledgement and sighed away her stress.

They had a hard day behind them both. Gabriel was driving the company crazy.

Everything had to be absolutely perfect, the models were walking the runway and walking it again because they had swayed their hips too much, had not swayed enough, were not making wide enough steps, you get the gist.

Mari had run around almost every minute of her workday and Adrien had been fitted and fitted and had walked and smiled and frowned.

Though both of the heroes were content to just sit there and think about their days the night air was getting colder by the minute and soon they were both saying their goodbyes and jumped home.

Mari retrieved a cookie for Tikki and Adrien was rummaging for Plaggs cheese:

"Hey Adrien, you should look for something that can keep your stink in!"

Mari was cheerfully mocking him and his cheese.

"How dare you! It smells delightful." He holds the cheese under her nose.

"Ew! Adrien, I seriously have to rethink this whole roommate arrangement if that is what you do to me!", she giggled.

Adrien stared. This giggle. The stinky cheese.

"Maybe… We should get some tupperware and not a new fridge…", her eyes snapped open and her mouth dropped. She had not said anything to Adrien yet. And neither had she talked about it to Tikki nor anywhere in his presence.

Only Chat knew about her wanting a fridge for the cheese. Chat had not visited her after Adrien had moved in.

Adrien had not asked where she went during akuma attacks even though her excuses were ridiculous.

Chat knew a lot about her as Marinette, they had become friends, she was friends with Adrien.

Chat had known where she lived when she moved out.

Had she seen Adrien during an attack where Chat was already at?!

She was not sure anymore or at least she herself had been there two times during that timewarp thing.

While Mari was starting to freak, Tikki that had been hidden in her baggy shirt slowly rose and curtseyed. "Hello Chat. I'm Tikki, the goddess of luck. I see Plagg has not lost his appetite for stinky food."

Adrien grinned roguishly, bowed and yelled for Plagg:

"Get your ass over here you lazy cat! The Lady is here!" Plagg bounced in and after a short shrug he flew around Maris head and purred:

"You give great scratchings, milady."

Mari almost starts to hyperventilate when Adrien repeated something from early in their superhero lives:

"I love you, Milady Princess. Even more outside the mask." he blushed a little while Mari had troubles accepting everything that is happening.

"You love me." she said it slowly and deliberately. Trying how it sounded.

"Adrien loves me." a little louder, "Do you know how long I've waited to hear that from you and then from Chat to me and not Ladybug and now you just!... Urgh!"

Fed up she didn't hold back and jumps at Adrien, planting a kiss on his lips while he stumbled against the now closed fridge.

It took almost no time for him to react to her pouncing.

When she had enough she stood back on her own, hit him for good measure and pulled him to sit down on the couch.

There was a lot of kissing that night, a lot of talking, how each of them met their kwamis friends, exploring their new found relationship.

They tingled where the other touched, they were touch starved even though they lay in each others arms, they missed the voice of the other as soon as they had stopped speaking and missed their lips as soon as they were taking a breath.

Their situation as roommates had them laugh out loud. It made so much sense to live together and they cried with laughter thinking about how they hadn't noticed the other being a Superhero flying out of the window on a daily basis. It was how it should be.

The kwamis had exited the room for safety reasons and had another great evening just lying on a pillow. Plagg was being scratched by Tikki and had the same compliment for her as he had had for Marinette.