I'm the Only One Who Doesn't Know My Sister is My "Stepsister" ~The Beautiful Twin Sisters Want to Seduce Their Oblivious Brother~ - 5

Chapter 5: Kairi’s Feelings and Yuuri’s True Nature (Yuuri and Kairi’s POV)

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After overhearing Papa and Mama’s conversation with Onee-chan yesterday, one certain feeling inside my heart finally took a solid shape. Since we were little, us sisters were always sticking to our Onii like glue. Hence why, I was sure Onee-chan also shared the same feelings as mine. I had always loved my Onii since I was young. Not one of those familial love, but a real love. A passionate love. 

Since a long time ago, Onii had been our pride. He was handsome and kinder than anyone else. However, we thought we wouldn’t be able to have a meaningful relationship with him since we were related by blood to him, until now. 

After entering junior high school, I forced myself to act curt toward Onii as a desperate attempt to erase every inch of my feelings toward him. But deep down in my heart, I still wanted to be spoiled by Onii like always. I wanted to hug him a lot and I wanted him to gently pat my head. However, since we were blood related siblings, I convinced myself that being too clingy to him wouldn’t do any good to either of us. Hence why, I turned into a rebellious gyaru as a way to relieve my stress and so I could act tough around other people. 

I kept telling myself over and over again that I shouldn’t be in love with Onii. I forced myself to act cold to him, thinking I could hate him one day and fall for someone else instead. However, no matter how curt I was to him, Onii still remained the same kind big brother to me. He was attentive to my needs, like helping me by putting away my socks. In the end, I couldn’t bring myself to hate him. And so, three years passed just like that. I didn’t even have the slightest intention to look at other guys during all those years. 

But then, a miracle dawned on us. It turned out Onii wasn’t related by blood to us two. Because of that, I started to see this as my chance to start anew with Onii and for that chance to happen, there was something I had to do. That was…

“I want to get into the same high school as Onii!”

I wanted to increase the frequency of my time with Onii as much as possible. That was why, I had to get into the same school as Onii. I actually said it! I really said it to Onii!! Saying I wanted to go to the same high school to him was practically a love confession! Ahhh!! I was becoming so aggressive!!

“…A-Are you serious?”

Onii looked at me, his expression aghast. Well, I just practically confessed to him.

“I’m curious, what’s your current deviation score?”

“40.”

Onii’s face became even more pale. 

“Sh-Should I be relieved that you at least have a 40 score, or should I just say it outright it’s impossible….?”

“What are you mumbling about, Onii?”

“You… Are you really serious? You know the minimum passing score for my high school is 60. That’s the bare minimum.”

“That’s why I’ve started to study for real!”

“Arghhhhh…”

Onii groaned while holding his head. Was he that happy because I wanted to get into the same high school as him?”

“Yuuri is an honor student, so she will have no problem getting into my school, but… In your case, I think it’s better for you if you go to an ordinary school with an average deviation score of 50…”

“What?! Don’t be discriminative! You need to treat your little sisters equally!!”

“I’m not!!”

Rather than happy, Onii was feeling exasperated instead. I was a bit irritated, but well… I couldn’t deny the truth either. It was true that I hadn’t put much effort in my study until now and that was precisely why I asked for Onii’s help. I didn’t have the confidence that I could get into his high school either…

“I’m going to study like crazy so I can get into the same high school as you!”

“Alright. Then we will need to start ask Dad how much money he can give to bribe the school…”

“Stop making it sound like I NEED to use the back door to get in!!”

“But there’s no way you can get in through the front door! Just what were you even doing during all those three years? You’re not in any clubs, right?!”

“Well, things like makeup and nails mostly.”

“You’re really not going to say ‘study’ no matter what, huh?”

Onii seemed to be lacking the enthusiasm to help me… At this rate, he was going to refuse to help me for real. In that case… I needed to use my secret trump card. I would need to force him to touch my-my boobs!!

Just as I was about to take Onii’s right hand, he suddenly said. 

“Well, if you’re really serious then I will help you out in the earnest too.”

“Huh? Wha-What did you just say?”

“I will help you. With your study, I mean. My little sister is having trouble. It’s my job as the big brother to listen and help her solve the said problem. I’m your big brother after all.”

“O-Onii….”

“We-Well… How should I say it? It’s been a while since we last talked like this. You know, talking without holding back and to be honest, I’m really happy. I like this. It’s not bad.”

“Thanks, Onii… I appreciate it. For real.”

And so, I managed to get Onii’s help with my studies. I hoped this could be my chance to become close with Onii again…

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“And this is the end of today’s lesson. We only have less than 6 months until the exam. Make sure to review the materials thoroughly.”

“””Yes.”””

After finishing cram school, I walked along the now-dark streets towards my apartment complex. 

“I ended up dozing off a bit during class today…”

Last night, I overheard a certain conversation between my parents from the living room. I became unable to sleep well because of that. It was a shocking truth. Onii-chan wasn’t actually related by blood with us sisters. This was truly a stroke of luck. 

I had always thought it’d be nice if we weren’t actually related by blood, but at that time, I thought it was just my wishful thinking. But still, I couldn’t help but to keep hoping. I kept on improving my appearance for the sake of this day. 

No, that wasn’t quite right. Whether we were related by blood or not, it didn’t really matter to me. I had been working on improving my appearance because I wanted Onii-chan to fall in love with me, regardless if we were related by blood or not. I aimed to be the perfect beautiful girl. An honor student with impeccable beauty. I mean, saying we couldn’t be in a relationship simply just because we were related by blood didn’t sound logical to me. I couldn’t accept it. It was a strange excuse. But now… It turned out we weren’t related by blood after all. I could become Onii-chan’s wife legally now. Nothing could make me happier. 

I had always loved Onii-chan or the past 15 years. I had never bullied him like Kairi did. After all I… I loved Onii-chan so much that I even ‘did it’ alone while thinking about him. I would pretend to help Mom with housework so I could take Onii-chan’s freshly used underwear or rummage through his trash while he was out so I could collect and sniff those dirty ‘things’ that he had left behind in the trash can.

Allow me to be frank. I wouldn’t lose against anyone in my love toward Onii-chan. I had always thought Onii-chan should only be kind to me. I wanted him to always be kind for all eternity. Now that I knew we weren’t related by blood, I couldn’t stop myself from thinking that I wanted to ‘bear Onii-chan’s child.’

“And yet.. Kairi suddenly started studying. This means Kairi is targeting Onii-chan oo…”

Kairi had been in her rebellious phase since she entered junior high. She had been cold toward Onii-chan ever since. She had refused to have her clothes washed together with Onii-chan’s used underwear. She had even refused to eat dinner together with Onii-chan, even though I couldn’t imagine a greater bliss than that. She had always refused all those blessings and yet… She immediately flipped her attitude the moment she heard we weren’t related to Onii-chan by blood. Really… Kairi was the worst. 

It would be the absolute humiliation to lose against a fool like Kairi. I knew for sure my love for Onii-chan ran deeper than her, so I mustn’t lose. I absolutely couldn’t lose against her.

Now that I had made up my mind, I returned to our house. 

“…I’m home.”

Upon entering the apartment unit, I looked at the shoes. There were only Onii-chan and Kairi at home. The lights in the living room were still on and I could hear excited chatter coming from the inside. 

What’s with this… Unpleasant premonition?”

“Onii, you’re so smart!”

“Well, of course. These are junior high stuff after all.”

“Huh? But I don’t get them at all…”

“That’s because you’ve been doing everything but studying! Come on! Next question!”

“Ooookay~”

From the door to the living room, I could see the two of them studying together. They looked like they were having a great time together. 

…Huh? WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY WHY?????

“Kairi and Onii-chan… Did they reconcile without me noticing…?”

That blonde delinquent little sister… Even though she mocked me for being a brocon yesterday… She belittled me so much and yet… Here she was, acting like a female in heat in front of Onii-chan. Unforgivable. I absolutely wouldn’t forgive her. 

“At this rate, I will need to have a  ‘stepsisters meeting’ right after this.”

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