Requested by Sia_kurenai
Tysm for your request. Sorry if I made you wait too long.
Alright on with the story....
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No one's P.O.V.

"Hey sis, wanna tag along with me to my practice?" Lain asked standing and leaning by the doorway. Harry was peeking from his furry collar.

"Me? But why?" A certain (h/c) haired girl asked as she turned to look at the male at her room's door.

"Well, I need someone to watch over Harry since I plan on training a little bit longer than usual today." He explained.

"Is that so? Alright then. I had nothing special to do today as well." She shrugged.

"Good. Then let's get going." Lain said before turning to leave.

"Hey! Wait for me!" The female exclaimed as she went to catch up with her brother.

It was quite a walk to the Raging Bulls. Lain and the girl named (Y/N) were walking side by side on the footpath like any normal person would. They could hear some boys whispering and giggling, saying things like,

'Damn, that girl looks pretty.'

'I think I'm gonna ask her out.'

'Yeah let's go check her out.'

And a group of three random guys were making their way up to the duo until a certain person's dark aura and glare scared them away.

"Geez, brother you really have to look that scary?" (Y/N) asked, trying to suppress a laugh. Lain just rolled his eyes as he replied,

"I don't like those sort of guys even near you. I'm your brother so of course it's my responsibility to protect you."

"So now asides from beyblading, worrying about me is also your responsibility?" (Y/N) giggled as the violet haired male nodded and they continued to walk.

"By the way, what's the name of your coach?" (Y/N) asked tilting her head to her side.

"How many times have I told you? It's Shu Kurenai." Lain replied sounding slightly annoyed at his sister's forgetfulness.

"And you better not swoon over him. He's already sick of his fangirls." He continued as he rolled his eyes and (Y/N) made a 'tch' sound.

"What makes you think that I'm gonna swoon over him, huh?" She asked narrowing her eyes.

"Hmph. You're the one always watching his battles on your phone and then smiling like an idiot when he shows his scar. And yet you forget his name so many times." He scoffed.

"Oh I don't forget his name, y'know? I just don't understand how a nice and handsome blader like him decided to train a jerk like you."

She said smirking playfully as Harry peeked from his shoulder and made a soft squeaky laugh sound.

"Haha. Very funny." Lain said completely un-interested.

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(Timeskip) At the Raging Bulls:
No one's P.O.V.

"So this is where you train everyday, huh? Pretty big and fancy place." (Y/N) said looking around in awe.

"Yeah, I know. Now, hold my hand if you don't want to get lost here." Lain said simply as (Y/N) looked at him in dramatic disbelief.

"Seriously? Do you think I'm a 5 year old now?" She asked raising an eyebrow.

Lain held her hand and said, "No I don't. But I do know that you love to run around and get lost."

(Y/N) huffed in annoyance before mouthing an 'okay' as the duo proceeded inside.
They went upstairs and in a big training room where a certain albino boy was practicing beyblading.

'Oh my gosh! It's actually Shu Kurenai! I'm seeing him in reality and so up close!'

The girl squealed internally before getting elbowed by Lain who had a look on his face that said, 'Don't daydream here.'

"Hey, Shu."

Lain called out as usual and made his way up to him. (Y/N) followed.
Shu turned to look behind him, only to see his student and a certain (h/c) girl.

"Hey, Lain. Who's this?" Shu asked glancing at the girl.

"She's my sister, (Y/N) Wallhala. Today I brought her here so she could watch us practice and also look after Harry. You don't mind, do you?" Lain explained and asked.

"Not at all." Shu replied as he examined the girl. Judging by her looks, Shu thought,

'She doesn't look like Lain at all. Neither does she look like a blader. Maybe she's just a normal one and not as strong as her brother.'

"Well then, let's get started with today's training session."

Shu said out loud as he went to one side of the stadium and Lain after handing Harry and his coat to (Y/N) went to the other side.

"Yeah sure."

Lain said as both the student and mentor got in their launching stances. (Y/N) made Harry sit on her shoulder as both of them were excited to watch the battle.

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After a good 4 hour practice session:-

Harry had fallen asleep on (Y/N) shoulder while she was still watching the battles and yawning from time to time.

"That's enough training for today, Lain. Let's take a break now."
Shu suggested as he wiped off some sweat from his forehead.

"Yeah that's not a bad idea."
Lain said panting and sweating too. Both of them went to the benches and sat on either side of the (h/c) girl as they drank some water to refresh themselves.

They sat in a comfortable silence until (Y/N) decided to break it. "Hey, Mr. Kurenai?"

Shu turned his head to his side and glanced at the female, "Yeah?"

"Could you please give me a chance to battle you?" She asked politely as Lain looked at his sister slightly shocked.

"Me? Sure, why not? But what makes you want to battle me?" The albino asked.

"I just noticed how strong you are when you battle. Your aura and strength makes me want to battle you." (Y/N) explained.

"Alright then. Bring it on." Shu replied as he thought,

'This seems to be an easy battle. I don't think she's a strong blader.'

But as we all know, 'Never judge a book by it's cover.' Nonetheless, they got into their launching stances with Lain being their referee.

"Ready, set!" Lain said as he raised his hand up.

"3"

"2"

"1"

"LET IT RIP!"

They launched their beys with full force in the stadium.

"Alright Spryzen, we're going for the win!" Shu yelled out loud as Spryzen charged at (Y/N)'s bey in full speed. (Y/N) smirked as she yelled back,

"Not so fast! (B/N) counter spin!"

(B/N) stopped for a while before it changed its direction of spinning and attacked Spryzen, knocking it away. Shu couldn't believe his eyes,

'Did that bey just spin counter clockwise direction right in the middle of the battle?!'

"Alright now! World whip!" Shu ordered as Spryzen dived in with full force. Shu's aura got awoken and his resonance was visible.

'Guess, it's time for me to end this and win the battle.' (Y/N) thought.

"(B/N)! Now, (Beyblade move)!"

She yelled as the avatar of the bey came to life and resonated with its blader. It charged at Spryzen and the beys collided sending powerful waves in all directions.

And...Spryzen burst.

"(B/N) wins with a burst finish! The score is 2-0! (Y/N) is the winner!" Lain announced.

"Yeah!" (Y/N) exclaimed happily as she picked up her bey and brushed it with her cheek. "You're the best, (B/N)!"

Lain sighed as he smiled, "When will you grow up?"

As for Shu, he was left surprised by (Y/N)'s strength. 'That girl...something is different about her. Her resonance with her bey...that was so much like Valt's and mine.' Shu thought.

"Oh my gosh! Look at the time! I'm gonna miss (Your favourite TV show)! Lain hurry up! We gotta go!" (Y/N) suddenly exclaimed as Shu got snapped out of his thoughts.

"Oh come on, is it that silly TV show again? Why can't you jus-" Lain got cut off as he got dragged away by his sister.

"Bye Mr. Kurenai! See ya later!" She said before running off with Lain and Harry, leaving Shu standing there.

'I don't know why but I want to meet him/her again.' Two thoughts were thought at the same time by a future couple.

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(A big timeskip to the Ultimate Tag Series. Also I think Shu's not the only one who's interested in Lane's sister. ;) A certain green haired spectacle wearing boy might've also got an eye for her.)
No one's P.O.V.

"Come on (Y/N), just this once please? Go on a date with me." Silas pleaded as he put an arm around the girl.

(Y/N) who was getting annoyed slapped his hand off and said, "Silas Karlisle you know I'm not interested in you, right? So, please stop with the flirting."

"But-" "You are here again?!" A voice came booming in as a violet haired male entered the training room.

"Get away from my sister or else I won't hesitate to obliterate you and your bey with my flare!" Lain yelled at him.

"Tch. Alright, alright." Silas said before he walked away.

After he was gone, (Y/N) looked at her brother and gave him a small smile, "Protective as always."

"Yeah, yeah. Now take care of Harry while I'm gone, okay?" Lain said as he handed the sleeping hedgehog to her.

"Alright."

The girl smiled as Lain walked outside. Unbeknownst to them, another boy had been watching everything from afar.

He watched as Lain left (Y/N) all alone. He thought, 'I must confess to her before it is too late.' This certain boy was none other than Lain's mentor Shu Kurenai.

Ever since (Y/N) showed him her strength and defeated him, he had developed feelings for her. But he was hesitant to confess to her since she was always being flirted at by Silas.

But now that he knew that she wasn't interested in him, he wanted to go and confess right away. So taking in a deep breath, he made his way to the room she was in.

(Y/N) sat stroking Harry's hair while it was asleep. She turned her head around when she felt a presence behind her.

"Oh, hi Mr. Kurenai." She greeted as the albino walked inside and cleared his throat.

"Erm...please just call me Shu." He said.

"Okay, Shu!" She smiled as Shu blushed at how nicely his name rolled off her tongue.

"What brings you here? I thought you would be with Lain, right now." (Y/N) asked tilting her head innocently.

Shu walked closer to her and sat on the chair in front of her as he replied,

"I wanted to tell you something."

"Oh, funny. I also had this thing I wanted to tell you." (Y/N) retorted.

Shu looked at the girl raising an eyebrow before replying, "Okay then, ladies first."

(Y/N) sat a bit more straighter as a heavy red blush rested on her cheeks, before she replied, "Shu Kurenai, I-I like you..."

Shu's eyes widened as she continued,

"Ever since, I first saw your battles on TV I had fallen for you. Not just because of your looks but because you are so strong and serious when it comes to blading. And when I came to know that you're my brother's coach, I got the chance to meet you up close. That made me fall for you even more because of how wise and kind you are. I know you probably think I'm another fangirl of yours but I just wanted to say that I-I.....I love you!"

She confessed and looked at Shu who had his eyes wide. She thought that she might get rejected so she quickly spoke up,

"I-It's alright i-if you d-don't-" The (h/c) haired female got cut off as she got pulled into a hug. Shu was smiling as he placed his head on top of hers before replying,

"I was about to tell you the same thing (Y/N)! I love you too!" He confessed as (Y/N) smiled too and hugged him back.

Pulling away just enough to look at her face, Shu leaned down to close the gap between their faces, lighting up (Y/N)'s face like a tomato in the process.

"Ahem..."

They immediately pulled away when they heard someone clearing their throat. Looking at the doorway, it was none other than (Y/N)'s brother Lain.

"O-oh hey brother." She nervously smiled.

"May I ask what were you two doing just now?" Lain asked narrowing his eyes.

"A couple thing." Shu simply replied, making his girlfriend hide her face in embarrassment.

Lain walked closer to the duo as he warned Shu with the utmost sincerity in his voice,

"Shu, I respect you a lot as my coach. And since I know how much my sister loves you, I'm allowing her to be with you. But if you break her heart or ever dare to make her cry, then I'm gonna swallow you up in my flare."

Shu nodded and gave a small smile, "Don't worry I'll take good care of her. I'll always be there for her."

Lain patted his sister's head as he smiled, "Looks like my little sister is all grown up now."

(Y/N) smiled at both the boys before getting up and pulling them by their arms as she exclaimed happily, "Now let's get training guys!"

Lakn managed to grab Harry just in time before the student and the mentor got pulled away by the girl.
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Ouch! My fingers are in pain now. But it's to make you all happy so it's alright. 😊 I hope you like the requested story. I'm sorry if you didn't. I'm also sorry for my terrible grammar. 😞 I'll get better in the future.
Anyways vote, comment, share and maybe....follow me too? All the characters belong to Hiro Morita, only the story plot is mine.
Stay safe and have a nice day/noon/evening/night.
Sayonara, bug out.