Boy Next Door

Kid AU. Aomine is 7 years old when he is dragged to their new neighbor's house by his parents. There, he meets Kasamatsu, a 5 year old boy.

"Daiki, fix your tie, please."

"Why do I even have to wear a tie?" Aomine asked, pouting up at his mother. "It's just next door." He grumbled, more too himself than his mother as she sighed and fixed his tie for him.

"I know it's next door. But we got to leave good impressions, right? Besides, I believe they have a son around your age, maybe a little bit younger." Aomine perked up at that. It would be nice to hang out with an actual boy for once, since all he ever did was be forced to play with Satsuki's dollies. At least he got the satisfaction of ripping their heads off.

"I get to play with him?" He asked, blinking his wide, blue eyes at his mother. His mom laughed and patted his head. "Of course, sweetie." She said, smiling. Aomine's father came down the stairs, grumbling about his tie as he tried to loop it properly. His mother arched her delicate eyebrow and helped him with it. "I swear – you boys and your ties." She chided, smoothing the wrinkle out of her blouse.

"Ready?" Aomine's father asked, looking at his wife before looking down at Aomine. Aomine nodded and opened the door. He ran outside and stared up at the large house next to his, where a big moving truck was still parked at. The 7 year old grinned, looking back at his parents exiting their house. He ran across the grass of their neighbor's lawn, ignoring the scolding from his mother and stopped in front of the door. He waited for his parents to walk all the way around on the sidewalk and up the small paved path and end up beside him, before pushing the doorbell five times.

Aomine smiled cheekily when his mother swatted his hand away from the button and cleared her throat when footsteps approached the door. The door swung open and a young woman with long, silky black hair stood there. She looked surprised at first, but smiled when she realized the neighbor's had come to greet them. "Hello." She said politely, smiling.

Aomine watched as his mother proceeded to introduce herself, as well as his father and him, make small talk with the other woman before she too introduced herself. He looked away, beginning to feel bored from the exchange until a form caught his attention. Aomine blinked and tilted his head, noticing a kid shorter than him venture behind the other woman's leg, gripping the fabric of her pants.

"Ah, this is Yukio." The woman said, patting the kid's head lovingly. The kid flushed and hid behind her even more, shyly waving his hand in a greeting. Aomine listened to his more coo from the 'cute and adorableness', but he just stared at the kid. "He'll be 6 in 8 months, won't you, Yukio?"

"Wait." Aomine interrupted, holding his hand up. "That's a boy?"

"Daiki!" His mother hissed, swatting his head softly. Yukio's mother blinked in surprise before she started giggling. "I already told you that he was a boy, remember?" Aomine's mother whispered to him, huffing. "I'm so sorry, Kasamatsu-san. And to you too, Yukio-kun."

The younger Kasamatsu just looked up at Aomine's mother shyly, nodding slowly. "I- It's okay…" He stuttered out, cheeks still rosy from all the attention on him.

"Well, I'm sure Daiki would love to play with you, Yukio-kun." Aomine looked at his mother sharply, glaring at her. She ignored him and ushered him inside, taking his father and dragging him with her as the three headed to the kitchen, leaving Aomine alone with Kasamatsu.

"… Hey." Aomine finally said, feeling somewhat awkward around the slightly younger boy. He scratched his cheek and sighed, rubbing the back of his head. "So, what do you wanna do?"

"I dunno." Kasamatsu replied, his steely-blue orbs moving from Aomine to the floor in thought. "I could show you my room." He suggested quietly, blinking at Aomine rather innocently. Aomine stared at him before shrugging and motioning for him to move.

Kasamatsu ventured up the stairs slowly; looking back every few steps just to be sure that Aomine was following him. Once he made it to his room, he pushed the door wide open and strolled inside. Aomine walked in after the younger boy and arched his eyebrow. "Why do you have a bunch of dumb books and stuff?"

"Le- Learning to read and write."

"Why?"

"… ?" Kasamatsu stared at him, confused. Aomine rolled his eyes and plopped himself down on Kasamatsu's bed. He picked up a book and flipped through it, staring at the pictures before tossing it back on the bed. "Don't you have any games or something?" He asked, going through a box filled with crayons and pieces of paper.

"Go fish?"

"I mean video games." Aomine stated, looking at Kasamatsu weirdly. "Are you like, deprived?"

Kasamatsu shook his head, "No…?" He answered. Kasamatsu walked over to Aomine and clambered up onto his bed. He sat next to the older boy and swung his legs off his bed, grabbing one of his favorite books. "Can you read?" He asked, blinking innocently up at Aomine as he offered the book to him.

"… Mostly." Aomine answered, looking away. He glanced back to see Kasamatsu holding the book in front of his face, staring at him as if silently asking him to read with him. Aomine twitched but gave in a few seconds later. "Fine." He huffed, taking the book from the other boy's hands.

He flipped it open and eyed the picture of some cartoon-ish drawing of a little boy holding a basketball in his hands. "Do you like basketball?" Aomine asked, raising his eyebrow at the younger boy next to him. Kasamatsu tore his gaze from the picture and nodded, smiling shyly. Aomine smirked, thinking that the kid was not going to be all that bad to hang around with, "Me too. I'm gonna be the best basketball player when I'm older." He stated, puffing out his chest.

Kasamatsu stared up at Aomine with wonder in his eyes, "The best?" He repeated in a whisper – as if already picturing some face-less older version of Aomine standing under the spotlights in the middle of a basketball court, holding up an orange basketball in his hands for the whole stadium to see.

"Definitely the best." Aomine nodded, smirking as he crossed his arms over his chest. "If you're gonna play, then you gotta train hard to keep up with me. I mean, I'm already pretty good at it."

"O- Okay." Kasamatsu nodded quickly, squeezing his small fingers into a fist. He clenched the fabric of his shorts, looking back down at the book and staring at the picture once more. "I'll tra- train hard." He promised.

This will be known as that oneshot in which Kasamatsu is younger than Aomine. But seriously, kid!Kasa is so cute *u* Even though he's only 5, he still studies. xD He's still such a responsible senpai~

~WinterAssassin~