The Case Where I Found Out My Big Sister with a Brother Complex Was Actually My Stepsister, Tried to Hide It, but She Found Out Immediately and Became Uncontrollable - 21

Chapter 21: My Attractive Big Sister

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“There are so many food stalls, it’s hard to choose which one to pick.”

“Yeah, but it’s so lively. Just walking around and looking is fun too.”

“I was thinking the same thing! Tsumugu!”

Nee-san had been handing out flyers for the play, but she had just finished, so now we were walking around the food stalls with a pure heart, without thinking about anything else. Every stall looked either delicious or fun, making it hard to choose…

“Nee-san, there’s a takoyaki stall.”

“You want takoyaki, Tsumugu?”

“I figured takoyaki is kind of the classic cultural festival food.”

“Yeah! Then let’s go buy some takoyaki!”

And so, Nee-san and I went to buy takoyaki together.

“Excuse me, could we get two portions of takoyaki?”

“Sure~! They’re freshly made and hot, so be careful when eating them~!”

“Thank you.”

After paying, we received two portions of takoyaki. I handed one to Nee-san and we moved to a bench in the courtyard. Normally, not many students go out of their way to come to the courtyard, but since it was the cultural festival, it was pretty lively today. I quickly picked up the toothpick that came with the takoyaki and was about to eat one when—Nee-san suddenly stopped my hand.

“Wait.”

“Nee-san…?”

As I looked at her in confusion, she took the toothpick from my hand and used it to stab one of the takoyaki I was holding.

“The vendor said it was hot, remember? I knew you’d just pop one into your mouth without thinking, so I’ll feed you slowly!”

“I-I can handle that much myself, Nee-san… Besides, there are people around.”

“Don’t worry about it! Now, open wide!”

“……”

I knew from sixteen years of experience that once Nee-san got like this, she wouldn’t stop, so I obediently opened my mouth and let her feed me the takoyaki.

“Ahh~… Is it good?”

“…It’s good.”

Even though the way I was eating was super embarrassing, the takoyaki itself had done nothing wrong. So, while feeling a deep sense of embarrassment, I honestly told her how I felt about the takoyaki.

“I’ll feed you more! But slowly, so you don’t burn your mouth!”

And so, we repeated that process for each ball of takoyaki. After Nee-san finished hers too, we decided to head over to one of the play areas next.

Play areas included things like plastic bottle bowling or ring toss—the kind of stuff Hasumi’s older sister was playing yesterday. As I looked around for anything that seemed interesting, I found something that caught my attention.

“…A water gun shooting game?”

“Normally, you do that with cork guns, right? Using water guns instead is kind of unusual.”

It wasn’t like I’d gone full child-mode or anything, but it still looked like a lot of fun.

“…Can we try it?”

“Yeah!”

After getting the okay from Nee-san, we went over to the water gun shooting booth and picked up our water guns. It looked like two people could play at the same time, and apparently, you could team up and hit heavier targets together to knock them down.

…The prizes seemed to be wrapped in waterproof coverings. After confirming that, we both readied our water guns.

“Nee-san, let’s aim for that box of snacks.”

“That one? Got it!”

Then, the two of us fired our water guns at the same time. Both streams of water hit the same snack box—and after a few seconds of continuous hits, we managed to knock it down.

“Congratulations!”

The staff handed us the snack box, unwrapped from the waterproof cover. It seemed like you could only play until your water ran out, and since ours was already gone, we couldn’t play anymore.

“I’m glad we got it in one shot.”

“We really are in sync, huh?”

“Yeah… Nee-san!?”

“Tsumugu? What’s wrong?”

Just as I was about to agree with her, I looked at Nee-san’s short-sleeved blouse and froze in shock… The area around her chest was slightly wet, and I could almost see the bra she wore beneath.

“Nee-san, your shirt!”

“Huh? …Ah, it’s not a big deal.”

“It is a big deal! Come with me!”

“O-Okay!”

I quickly took Nee-san to a private booth set up for the festival and then took off my uniform blouse.

“T-Tsumugu!? W-Why are you taking your shirt off!?”

“I can’t let you walk around the festival like that with your shirt soaked like that. I’ll wear your shirt, and you’ll wear mine… That way, it’s all good.”

Nee-san was considered tall even among high school girls, so she probably wouldn’t feel weird wearing my blouse. I also figured I wouldn’t feel too off wearing hers. I handed the shirt I had just taken off to her and turned my back.

“So go ahead, put it on.”

“Tsumugu… Alright, I’ll take you up on your offer.”

Then I heard the rustling of clothes from behind me. She must’ve taken off her top.

“…Tsumugu, your back’s gotten bigger.”

“Yeah?”

“Yeah… It’s really different from when you were little… You feel like a real guy now.”

“No matter how big I get, I’ll always be your little brother. though”

I couldn’t see her face since my back was turned, but her voice sounded kind of lonely. Wanting to reassure her, I said that—but then, Nee-san suddenly hugged me from behind.

“Nee-san…!?”

I almost turned around reflexively, but if I did, I’d probably see her in just her bra, so I quickly stopped myself… I could feel something soft on my back, but this definitely wasn’t the time to think about that.

As if confirming my thoughts, Nee-san spoke again. Her voice sounded more uncertain than before.

“Tsumugu… What do you think? Compared to when I was little… Do I look more like a woman to you now?”

Without hesitation, I answered her.

“You do.”

“…!”

“…You looked so attractive as a woman, Nee-san, so much so that I stopped taking baths with you.”

Even back then, I had no impure thoughts. Nee-san was still my big sister—but watching her grow more and more beautiful as a woman, I was scared I might start having weird thoughts about her. So I stopped bathing with her.

“Wait… Seriously!?”

She sounded shocked, but I thought I also heard a tinge of little happiness in her voice.

“…Yeah.”

“Like, which parts exactly—”

“N-Nee-san! Hurry up and put the shirt on!”

“A-Ahh! Right, sorry!”

She had totally forgotten about her state of undress and hurriedly put on my shirt. Then I put on hers, and we went back to enjoying the cultural festival together.

“So, Tsumugu? About what you said earlier—”

“Too embarrassing. Not saying it.”

“Ehh~!”

Nee-san looked disappointed, but somehow, she also looked happy. After that, we continued to enjoy the cultural festival together—and this year’s festival came to an end. A lot happened, but this year’s festival was really fun and it became a memory I would never forget. 

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