Y/n POV
"Nooooooooo!"
I was watching my boyfriend Chat and Ladybug fight an Akuma. From a safe distance of course. I wouldn't want Chat to freak out. Of course, to protect Ladybug, Chat sacrificed himself and got hit by the akuma. Is he okay? I hope he's okay. When the dust cleared, it revealed Chat. But smaller. I gasped. What happened. Even Ladybug looked confused. I ran over to them, and saw for myself an about four year old Chat.
"Chat," I exhaled. He looked up at me with wonder in his eyes.
"Y/n can you take care of him while I deal with the akuma."
"Aye, aye Ladybug." I took Chat's hand and began dragging him away from the scene.
"Bye bye Ladybug," he called, as he waved to her. She just sighed and shook her head. He turned back to you. "Are you an angel?" He asked nonchalantly.
"Psshhht. No. What makes you think that?"
"You're really pretty." Is he trying to flirt? As a four year old? Omygosh.
"Well I guess that make you lucky since I'm your girlfriend."
"Really! Yay! I love you y/n." He hugged my leg. I scooped him up, because this was taking a long time. I kissed his forehead.
"I love you too."
Time Skip
When we got to my house, I sat Chat down, on the couch in my room.
"Are you okay? Do you want anything?" I asked. He looked down and pointed at his tummy.
"I'm hungry." I poked his tummy and he giggled.
"Well, lucky for you because I know your favourite food." I quickly went downstairs to get a plate of croissants, and when I got back, Chat had detransformed. This wasn't surprising. I already knew he was Adrien. I'm not stupid. Plus he's a bad liar. All it took was a simple accusation and he couldn't deny it. Plagg looked at me expectantly. "You know where the cheese is. Go get it." And with that he was off. I offered Adrien the croissants and he scarfed one down quickly. I guess superheroing builds an appetite.
He picked another one up, and was about to eat it, but he stopped himself. He looked up at me, and handed me the croissant. Then he pointed to his mouth. I chuckled. "Adrien, I'm not going to feed you."
"Please. If you don't I'll start crying." His lip started quivering to prove his point. I sighed.
"Say Ahhh."
When he finished his croissant, he stood up, on the couch. I gave him a look of confusion. He stood on his tippy toes, and gave me a sloppy kiss on the cheek, with an audible smack. "Muah." He smiled cheekily at me. He pointed to his lips and closed his eyes
"Kitty, I love you, but I'm not going to kiss a four year old on the lips. You should probably take a nap."
"Whyyyyyy. You're not the boss of me." He crossed his arms over his chest.
"Actually, I kind of am. You have to do what I say."
"Noooo. You have to catch me first." And with that, he ran out of my room. I sighed. I kinda thought he would be a handful, but still...
Time Skip
I stalled a bit, looking for Adrien, but I eventually found him in the living room. He was hiding behind a curtain, and I could see his feet. I smirked and decided to humour him.
"Where could Adrien be?" I called out. I heard him giggle. I looked everywhere except the curtains. When there was no where else to look, I pulled the curtains apart. I was met with a giggling Adrien.
I scooped him up and said, "I found you!" I felt him trying to wriggle out of my grasp. I dint put him down until we reached my room, and I make sure the door was closed. My stood in front of me, and looked up at my in awe.
"Your so beautiful." I chuckled, and patted his head.
"I know kitty. I think you should take a nap now." As soon as I said that he yawned. I scooped him up and tucked him in my bed. Immediately, he started shifting.
"Stay with me," he begged as he yawned again. I awed silently as I slipped under the covers. The first thing he did was crawl into my lap. He rested his head on my tummy and sighed contently.
"Sweat Dreams, Kitty."
Time Skip
I saw Ladybugs magic working as the swarm of red light swirled around Adrien, returning him to his normal age. His eyes slowly fluttered open. He was confused, looked around, noticed our current position, and blushed.
"Uh y/n, was I sleeping in your lap?" I held back a laugh.
"Indeed you were kitty."
"What happened? All I remember is fighting the villain with Ladybug, and he hit me."
"He turned you into a four year old, Adrien. You were sooo cute. And you decided to crawl into my lap for a nap." His blush darkened. He got off of me, and pulled me into his lap. He rested his chin, In the crook of my neck.
"I prefer when you sit in my lap." I could hear him purr quietly. I giggled.
"Silly kitty."
"I'm your silly kitty."
"Just shut up and cuddle me."
And that was how we spent the rest of our afternoon. With the exception of me telling Adrien how he acted as me li'l kitty.
A/n: This.... this sounded better in my head. I decided to suck it up and publish it. Hope you enjoyed. This request took way too long.

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Adrien Agreste/Cat Noir x Reader One Shots
RomanceThe reader is a female. I'm making one because I love these, I might include a Plagg x reader because he counts. Please request