Free! Iwatobi Swim Club Imagines

Seijuro x Reader: My Best Friend's Brother

Listen to the music while you are reading please ^^ I got an idea for this from of the song "Best Friend's Brother" or "BFB" by Victoria Justice and Ariana Grande from the show Victorious.

~~~~~

"S-Seijuro-san!"
You frantically stuttered, your mouth failing miserably to form the words of any human language. You were positive you had called your best friend's number, not his.
Then again, your best friend's brother was Seijuro.
Mikoshiba Momotarou was better than any friend that you could wish for, or that was how you saw it. He was as loyal as a lost puppy (or more like a lost otter in his case), is always making you smile no matter what mood you are in, and is always by your side in good times and bad. You couldn't even think of the last time you ever had an argument with him.
But the horrible thing was, you developed more then a crush on his elder brother, and it made you feel disgusted with yourself that you would do this to him.
"(Name)? Are you there?" Seijuro's tenor voice rang through the phone, attempting to get your attention from what was distracting you.
"U-Uh...gomensai! I'll call Momo later!" you stated rapidly, pressing the end call button a second later.
Taking a moment to catch your breath and calm your heart rate, you scrolled through your call log.
You had definitely called Momo's number. So why did Seijuro pick up?
Well, he is his brother, you thought, sighing deeply. If only Momo would be alright with it.

~~~~~

Later that day, you were walking downtown to go to your favorite café, still pondering about your situation.
Your eyes were locked on your (favorite shoes), causing you to knock into several people and resulting in numerous apologies.
You knew that Momo was always competing with his brother. For swimming, for popularity, for reputation, but also for girls' attention.
And unless you got the concept of anatomy completely wrong, you were a girl. Seijuro never paid you any more then a hello or a small, polite conversation. He obviously did not return your feelings, you convinced yourself so.
But why does your heart hurt so much?
You felt your eyes begin to sting with unshed tears, and quickly wiped them away.
Finally walking into the quaint café, you couldn't help the small smile that crossed your lips as you walked up to the counter.
You weren't very hungry, so your just ordered a (drink).
After paying for your beverage, you walked to your favorite booth in the corner of the space. It was secluded enough from the the chatter of customers, but not too isolated either.
Sipping your drink, you unlocked your phone once more, seeing Momo had tried to return your call. Instead of a voicemail, you had a text message from an unknown phone number.
Opening the message, it read,

Hey (Nickname)cchi!! I left my phone at home, so I'm texting you from Nitori's. I'm at a swim meet right now, and it's almost my race so I'll call later!!! 😁

Laughing lightly, you closed your phone, happily getting comfy in your seat.
"May I sit here?" A voice questioned, and you could see a glimpse of dark wash jeans and a plain black T-shirt.
Wait a minute. You recognized that voice.
With much reluctance, you glanced up at the face of the male, only to notice that last person you wished to see.
Glancing back down quickly, you managed a small nod.
Once he sat down, there was an uncomfortable, awkward silence between the two of you.
Butterflies fluttered in your stomach but your chest felt heavy, and neither of you could look each other in the eye.
Seijuro suddenly sighed. "Listen (Name). I know this might be weird because you're two years younger then me and you're Momo's best friend but..." He paused, rubbing the back of his neck. A bright crimson blush was quickly becoming visible on his cheeks.
"I like you."
You swore your heart skipped a beat.
You shot up, blinking, waiting any minute for yourself to wake up, realizing you were still in bed.
You pinched your hand from under the table and winced lightly, but nothing happened.
Your dream was reality.
"Look, I know you might think it's creepy but-"
"I like you too," you declared, putting an abrupt stop his babbling.
He gazed at you, eyes wide like a child who is about to get their first present on Christmas.
"R-Really?" he questioned.
You nodded, smiling genuinely. "For a couple of months actually."
"Me too..."
You both ended up laughing lightly, until he asked you to do the honor of being his girlfriend.
"Yes," you answer slowly, but with a firm tone to show you desired this as much as he did.
"It finally happened!"
Craning your neck towards the door, your bundle of nerves rewound themselves as you saw Momo, grinning at the two of you.
"M-Momo-kun! I-I can explain-" you commented shakily.
"Hitsuyō wa arimasen [1]! I was waiting for you two to get together for weeks! The entire swim team even knew about it!"
Somehow, your brain currently lacked the ability to process the current situation. "W-Wait...how did you get here? You texted me saying you were at a swim meet-"
"Check the time of the message," he smirked.
Pulling your phone from your pocket, you checked the current time and the time of the message.
You received the message over an hour and a half ago.
"Wah!! You two look so cute together!" Momo screamed.
"So...you're not mad?" Seijuro clarified.
"Of course not!" Momo put his hands on his hips. "I don't mind my best friend and my brother dating."
You placed a hand on your chest, finally restarting your heart, before Seijuro's lips met your own in a sweet, gentle kiss.
Meanwhile, Momo decided to give you two some privacy, walking toward the door of the café.
Putting his hand on the glass door, he craned his neck to glance at you once more, mumbling to himself,
"For now."

~~~~~

[1]: Hitsuyō wa arimasen! = No need to!

This was actually really fun one-shot to write! I hope you enjoyed it, @EritreaYunani or being there to talk when I needed it 😊.

Now, I'm thinking part 2?? Maybe with a little rivalry between Momo and Seijuro?? Hm?? *wriggles eyebrows* Tell me what you think in comments and how you want it to turn out! (Should the reader be with Momo, Seijuro, both, or neither?!) But just so you know if there is a part 2, I will write it after I finish all of my requests. Thanks for reading!

~ KidSoulBlackstar

Requests: 5 (Closed Currently)

Coming Up Next: If You Had A Long Distance Relationship [Iwatobi and Samezuka Boys] (Request)