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That moment when you find out your older sister is dating your best friend

Summary:

Ena was scrolling on social media, and she founds out that Mizuki, her best friend, is dating Akito, her younger brother. And they did for 2 months without telling Ena. And how would Ena get back at him for doing this? By dating her little brother's best friend, of course.

Notes:

I got the idea for this fic while reading this fic by anon the other day: https://archiveofourown.org/works/42228789

English is not my first language, so feel free to correct any mistake I've made :D

(See the end of the work for more notes.)

Chapter 1: Chapter 1

Chapter Text

Friday, 18:30 (Ena & Mizuki)

Apparently, Akiyama Mizuki and Shinonome Akito are dating. Ena still can’t wrap her head around this situation after she found out about their relationship from Akito’s social media post, and not from either of them telling her so. She’s mad, but not quite so. She doesn’t care about her brother’s love life or who is he dating (or at least she pretends not to), but the fact that the person Akito, her little brother is dating is her own best friend, Akiyama Mizuki is…

Okay, she needs to calm down first, and retrack the chronology. She was scrolling on her Instagram just an hour ago, looking at seemingly normal postings until she scrolls down to a picture posted by Mizuki which she had no clue on how she missed it, and the picture in question shows Akito sleeping, resting his head on Mizuki’s shoulder. It was posted around 6 weeks ago and from a glance, the picture shows that their location is on a train. Naturally like any older sister would, she stormed Akito’s bedroom and began interrogating him.

“AKITOOOOOO!” Ena called out (or screamed) his name as she opens Akito’s bedroom door forcefully without knocking and caring about anything she might walk in on that Akito does not want her to see.

“Hey- can you at least knock befo-” Akito protested, instantly forced into silence as his sister showed him that embarrasing picture of Akito sleeping on Mizuki’s shoulder. Akito attempts to snatch the phone away from Ena’s hand, underestimating Ena’s nail grip which causes a jolt of pain on Akito’s backhand.

“I NEED to know about this, Akito. Ugh forget it, how long have you two been dating behind my back?” Ena asserts.

“Two months.” Akito blushed.

“Wait- two fucking months and none of you told me anything about this?”

“Well, I thought Mizuki told you already.” He shrugged. Ena sighed, ‘looks like she’s not going to get anything out of him’

That night at 25:00, Ena decides that interrogating Mizuki might lead to better answers. So after N-25’s daily session, Ena slides into Mizuki’s Nightcord DM.

Enanan : amiaaaa!

Enanan : can we call rn?

Amia : we just finished the call :( did you really missed talking to me~?

Enanan : ew gay, I just have something that I wanna tty about

Amia :  enanan has something private she wants to say to me? (,,>﹏<,,)  omg omg I’m getting flustered why is my heart beating so fast aaaa

Enanan : shut the fuck up and get your ass on the voice call.

Ena hovered her mouse pointer over the call button and clicked it. The iconic Nightcord call ringtone plays on her headphone and after few seconds, Amia tuned in on the call.

“What’s up Enanan~” Mizuki said with their cheeky tone.

“How. Long. Have. You. Been. Dating. MY BROTHER?”

“E-eh~, he hasn’t told you already?”

“I asked him and he told me the same thing… so, what are you two hiding from me, I wonder~” Ena imitated Mizuki’s way of speaking.

“W-we aren’t hiding anything, of course~”

“Have you two kissed?”

“Eh?” Mizuki is flabbergasted at the direct question.

“Oh, what’s with the sudden silence, Amia-chan?” Mizuki is trying hard to regain her composure. ‘I-isn’t that like  t-too soon for us? Wait wait wait wait

“No, no, no, no of course not Enanan~, what made you think we did? And, isn’t it like too soon for us? I-I mean we’re still highschoolers- don’t get me wrong, I wouldn’t mind kissing him b-but…” Mizuki continued rambling about their oh-so-innocent-maidenly-love which kind of irritated Ena.

“…” Ena sighed and continued.

“As long as you two are happy, I’m happy too. But if you ever make him cry, I’ll make your life hell, Akiyama Mizuki.

Ena’s threat made Mizuki shiver from the sheer coldness Ena’s words bring. They had never heard Ena’s voice this serious before. ‘Perhaps Enanan can be protective of her little brother at times~’

 

~~~

 

Saturday, 02:13 (Akito)

Akito went downstairs to go to the toilet. While in the walk back to his bedroom, he passed his sister’s room and as expected, he can hear a faint sound of her talking, most likely talking with N-25. Just as he continued walking, he faintly hears her talking about him, mentioning the word my brother’. Akito tries hard not to cringe while hearing that. ‘I guess she’s interrogating Mizuki now. I wonder how the fuck did Mizuki put up with Ena for so long.’

As much as Akito hates eavesdropping on anyone’s conversation (even Ena’s), this time he cannot resist the urge to listen in from outside her bedroom’s door, Especially if the there’s indication that he is the subject of the conversation.

“As long as you two are happy, I’m happy too. But if you ever cause even a tiny drop of tear fall down his eyes, I’ll make your life hell, Akiyama Mizuki.” Shit. When the fuck did she get this protective of him?

 

~~~

 

Saturday, 14:15 (Ena)

“Here’s your bill, miss. Thank you for purchasing our cheesecake!” The cashier handed Ena her receipt for the two slices of cheesecake she just bought for takeout. Apparently, a new patisserie just opened recently and Ena didn’t know about it until last night after interrogating Akito. Ena bought two slices of cheesecakes, one for herself and the other one for Akito. Even though Ena hates the idea of giving that rascal (read: Akito) a treat out of her own money, she feels kind of guilty for not getting him anything while she enjoys her cheesecake for herself, considering their shared love of cheesecakes. She’s currently walking back home with the bag of cheesecakes on her right hand and continues doing so until an unkown voice snaps her out of her inner monologue.

“Hey cutie, wanna have a drink with us? You look quite lonely there~” A random guy she doesn’t know calls her out, his hands currently placed on her shoulder. His appearance screams punk. She looks at him and tries to think of a response to make the guy go away, but when she actually thinks of something, her mind just froze, unable to let out even a single syllable out of her thoughts.

“What’s wrong? Stunned by my handsome face? Haha! You have good taste, miss!” As much as Ena wants to kick this guy’s balls and run away, she just feels unable to do so. Before she knew it, his hands moved down from Ena’s shoulder, and reacher her left wrist. Ena gasps in shock, although just a couple seconds after this guy wraps his hand around Ena’s wrist, Ena hears a familiar voice calling out to her.

~~~   

         
Saturday, 14:17 (Touya)

Aoyagi Touya was just taking a walk around the town, when he sees a brown-haired girl that kind of resembles Akito’s sister Ena, talking to a man. From afar, it looks like they were just having a normal conversation but as Touya’s footsteps gets him nearer to Ena, he can hear the words spoken by the man. He hears something about “Hey cutie”, “Wanna have a drink with me?” and some other things along those lines. ‘This guy is hitting on Ena-san, I’m sure. I need to help her.’  Touya doesn’t have that much idea on how he would help a female aquaiantance who’s getting hit on, but from what he’s seen just calling her name and pretending like he’s someone who is close to her should do the job, and that’s what he decided on doing.

“Ena-saaaaaan!” Touya called Ena’s name. Ena instantly averts her eyesight to Touya’s direction, now they’re looking at each other while Touya fastens his walking pace.

“Eh?” Ena turns her face at the directon of the voice and she sees Touya walking towars her, wearing his usual gray hoodie with black jeans pants.

“T-touya-kun!” Ena called out Touya’s name.

“A-ah, sorry for making you wait, Ena-san.” Touya said to her, while giving a ‘just play along’ look hoping she would understand his cues.

“Hm? Oh y-yeah, in fact I just arrived here, hehe…” Ena figures that Touya is trying to drive the guy away from her.

“Is this your boyfriend, cutie?” The guy asked.

“H-huh? I mean-” Ena tries to deny, but Touya says otherwise.

“Yes, she is my girlfriend and we were just about to go on a date, mister. Now if you would take your hand away from her, I would appreciate it.” Touya grabs Ena’s right hand that is currently holding the paperbag she received after she bought her cheesecakes and puts his hand over hers. Touya then glares at the guy, signaling dor him to leave.

“Tch.” The guy rolls his eyes and then goes away from the two.

“Thanks, Touya-kun. I… didn’t know what I would do had you not saved me.” Ena expressed her gratitude.

“No, it’s nothing Ena-san! I just did what I’m supposed to do, after all! Also, s-sorry for telling him that you’re my g-girlfri…” Touya’s face is visibly getting redder. There’s also one other thing he hasn’t realized while saying his apology, that being he’s still holding Ena’s hand. Touya quickly notices and retracts his hand from Ena’s hand.

“Um, I apologize!” Touya quickly apologizes again.

“No, no, it’s fine. Actually, it’s better if you say you’re my… lover because that guy probably isn’t going to let me go otherwise, heh…” Ena replies. She notices that Touya is blushing which definitely makes the situation even more awkward for her, and she feels her face slowly heating up as well. Touya notices that the silence makes her uncomfortable from how she opens her mouth a little bit and makes the “uhh..” sound. He also wants to say something so that she doesn’t feel awkward. But it seems like all of the words he’s about to say got stopped juat at the tip of his tongue.

 

~~~

      

Saturday, 14:18 (Ena)

For a good minute, the pair just stood there while being a blushing mess. Ena grows uncomfortable from the silence and decides to break it.

“So Touya-kun, what were you doing around here.” ‘Gosh, this is awkward.

“Hm, I was just taking a walk, and m-maybe I’d get lunch on the way?” ‘Why is his blushing fase kinda c-cute?’

“Oh, why don’t we get lunch together then? My treat!” Ena said in the heat of the moment. She doesn’t know how to phrase her thanks for Touya and the Shinonome siblings’ way of saying thanks is giving each other food, so that’s what she decided on.