My Little Sister Is the Best F*p Material

Volume 1 Chapter 12: Everyone has something they don’t want others to know

It’s Saturday, and the weather is clear.

Today, I’m about to experience the biggest first in my life.

It’s a major event: walking outside with a girl.

Well, my partner is my real little sister, but I was still nervous before we left. I thought I was used to being with her, but going out with her is so different.

“You don’t have any decent clothes.”

Miyu is rummaging through my closet. I tried to keep it simple with a monochrome outfit, but she rejected all of them. Even the clothes I often wore when hanging out with Takanami and the others on weekends were thrown to the floor with a simple “No.”

“This one is a bit better, maybe.”

Miyu took out a plain T-shirt with a deep V-neck, which I had sealed away because I didn’t like the pretentious feel. If she says it’s good, I guess I can understand, but it doesn’t seem much different from the ones she’s already rejected. Maybe it’s because I’m immature.

The last time I bought clothes was about two years ago. Still, I’m not completely without new clothes, and I gratefully accepted the clothes my parents bought on a whim during sales.

“Is that my only option?”

“That’s it. The others are old. They don’t fit. The fabric is bad.”

“You can’t tell just by looking at the fabric, can you?”

“You can tell when you wear it. Just put it on.”

Miyu’s expression is serious. Her strong gaze, with slightly raised eyes, is even more intense than usual.

The next item she chose was underwear. I usually wear them too, and they’re a great item because they’re tight and go down to just above the knee, making my legs look longer.

Since the neckline is nice and open, a necklace would probably make it stand out more.

“It’s hot, and you’ll probably want to take it off anyway.”

“Yeah, but when it comes to fashion, I think accessories are a must.”

“You’re not going to be a host, are you? Shorts and a T-shirt are enough. Just cover it up with muscles.”

It seems my sister likes manly men more than slim, handsome guys.

Miyu was dressed in a summery outfit too.

Given the clear weather in June, the temperature outside was quite high. Her top with its visible shoulder straps revealed her deep cleavage, and apparently, it would get stuffy if she didn’t get enough ventilation. Her short pants, which showed off her fair thighs, were like a weapon.

In a word, my sister today was erotic.

“Miyu really cares about clothes, huh?”

“It’s just that you’re too sloppy, Onii-chan.”

After choosing my outfit for the day, Miyu continued to rummage through my closet. She decided that most of them should be thrown away and replaced with new ones.

“I’m going to introduce you to my friends, so I can’t let you go out looking like a piece of junk.”

Miyu reaches deep into the drawer. Her butt sticks out, and if I were to crouch down and look through the gap, I could probably see her underwear.

Even though I’m used to seeing women’s underwear in the laundry, I don’t know why, but I can never get enough of seeing the underwear she’s wearing.

Because of the curve in her waist, the roundness of Miyu’s butt feels just as feminine as her breasts. And then there are these legs, with just the right amount of meat on them. The whiteness of her knees, extending from her short pants, is sensual.

Now that I think about it, the first time I felt lust for Miyu was when I saw her thighs. I just want to touch them atleast once.

“Onii-chan…”

I realized Miyu was facing me. Then, she glared at my lower abdomen and then at my face.

“This is because of me, isn’t it?”

Miyu pointed at the tent I had pitched in my crotch. By saying “This is because of me, isn’t it?”, she meant, “Is this erection the result of you fantasizing about having sex with your little sister?”

“It’s just a moment of carelessness. It’ll go down before we leave, so don’t worry about it.”

“Is that so? Then it’s fine.”

Miyu resumed selecting my clothes. I wanted to ask her to let me off the hook, but if I used her as a masturbation material, she wouldn’t accept it verbally.

“Girls seem to have a lot of clothes. Is that the case with Miyu too?”

“Yeah.”

“Your closet must be a mess, huh?”

Given how much she cares, she probably buys a lot of magazines and has a lot of clothes. So, I’m curious about how she organizes them.

The size of the closet in Miyu’s room is the same as mine, and she has far more clothes, yet I throw my pants and indoor wear around without a care, and I’ve never even seen a uniform in her room.

“Hmm? Well you are not allowed to look at mine.”

After rummaging through everything, Miyu stuffed the piled-up clothes into garbage bags without a word. There were a few clothes that still seemed usable, so I felt a bit wasteful.

I guess that vague sense of unease is my excess fat. If Miyu stops caring, I’ll go back to being indifferent to my appearance.

“I’ve figured out what we need. It’ll cost more than 30,000 yen, but do you have that much?”

“I do. I’m surprised it’s that cheap. Are you going to buy proper clothes?”

“It’s not like you have to buy expensive things. You have to properly assess the items and buy the cheaper ones. Especially since you only have short-term part-time jobs.”

It’s easier to save my allowance by cutting back on my expenses than to earn it by sweating. Miyu doesn’t have a part-time job either, but I wonder where she gets the money for clothes.

“Shall we go out?”

“Yeah. But before that…”

Miyu neatly folded the clothes she had decided to keep and instructed me to sit properly on the floor.

“Before we go out, let’s have a serious talk.”

Miyu’s expression and tone were devoid of her usual ease.

“I didn’t want to say it because I thought it would make you more conscious of it, but since it came up in conversation, I’ll give you a proper warning.”

Miyu’s gaze pressured me.

It’s not the first time I’ve seen Miyu with a serious face, but today was the first time I found her face scary.

She wasn’t angry, and she wasn’t in a bad mood either.

It wasn’t a response to the words I usually threw at her. Miyu was showing me her raw emotions, which she usually didn’t show.

“If you peek into my closet, I’ll cut off our relationship. Seriously.”

Miyu said it in a cold, harsh voice. It felt like she would even commit murder to keep that secret.

“I, I understand.”

Of course, when you’re told not to do something, you want to do it, but given how clearly she forbade it, I realize that I still have some self-control.

“Really?”

“I promise. I absolutely won’t open your closet. I promise.”

Making that promise wasn’t a burden for me. That’s because I had a rough idea of what the problem was. And fortunately, I understood Miyu’s secret.

A secret about clothes that she didn’t want anyone to see in her closet.

Then, there’s only one possibility.

“I don’t know what you don’t want me to know, but I’ll support you no matter what.”

So, Miyu has that kind of hobby too. That’s why she never mentioned it when I played erotic games and just said, “Cute girl, huh?”

It all makes sense now. But at the same time, I also want to see it. Not to expose her secret, but just to see it once.

Miyu in a costume.

The shopping mall was huge. The building was large, but more than that, the structure with its open upper floors created a sense of unity throughout the store.

“All these stores look expensive…”

The displays in the stores made me feel out of place as a student.

It’s me, not us, that’s the point. There’s a girl walking next to me who’s much younger and smaller than me, yet she behaves as if she belongs in a high-class restaurant.

“I’ve checked out some affordable stores for men. Let’s just go straight to those and buy what we need quickly.”

Miyu led the way. In a normal date, the man should take the lead, but with such a reliable sister, I didn’t feel the need to interfere.

“What are we buying?”

“Summer clothes. A few sets that we can wear in layers like today. And maybe some shoes and indoor wear.”

Miyu stopped at the T-shirt corner. She flipped through a few shirts with different patterns and then quickly moved on to the bottom section.

“I could probably buy T-shirts and shorts myself.”

“Really? Then why don’t you choose some?”

Suddenly, I was left on my own. All I had to do was choose a safe pattern and color. Then, according to Miyu, the important thing was the fabric.

“Sorry. Can you choose for me?”

“Okay, okay.”

Only when I stood there to choose did I remember. The simpler the clothes, the more they all seem right, and when it comes to choosing, I often can’t decide. When I actually buy them, they often turn out to be more unflattering than I imagined.

“Because you don’t face up to your height and how easily you put on weight, you don’t know the criteria. At first, I’ll choose for you, but when you try them on, make sure you look in the mirror and think about what’s important.”

Miyu walked around the store and then picked up a few items and handed them to me. Even clothes that I hadn’t noticed before seemed to suit me when Miyu chose them.

Since I found out why Miyu was so particular about clothes, I started to enjoy just listening to her talk. This sister, who was usually emotionless and expressionless, who didn’t even say if my cooking was delicious or not, and who didn’t speak to others, had a hobby that she was passionate about.

It might be strange to say it’s adorable, but I was happy to know more about Miyu’s inner self. As her brother, I wanted to spend more time with her hobby.

“They all seem good, but do we have to narrow it down?”

“I guess not. After all, I chose them. It’s up to you, Onii-chan.”

I tried them on and felt good about them, so we bought them. The same thing happened at the next store. The clothes we bought, including shoes, were quite a lot.

With bags full in both hands, it was starting to get in the way of walking.

“We’ve walked quite a bit. Should we take a break before we go home?”

“Yeah.”

“Are you hungry?”

“I’ll eat if you treat me.”

“Sure.”

Well, she spent the whole day for me, so I have to show my gratitude, including for the future.

“Can we go into that store over there before we leave?”

On our way to the restaurant floor, Miyu seemed to find a store she was interested in, and since I didn’t have any urgent business, I readily agreed.

It’s a ladies’ store, and we have a lot of luggage, so I thought I’d just look at the displays outside and sit on a bench, but then…

I noticed someone making a strange movement at the edge of my vision. The person was trying to move away from me, but there was no time for them to leave before I turned to look.

“Oh…”

What a coincidence. The person was a girl I knew.

“S-Sotomichi-kun. What a coincidence.”

“Yamamoto-san. What are you doing here?”

Unlike Miyu, Yamamoto-san was dressed in clothes that covered her body. Her black hair, which fell over her shoulders, emphasized her ample chest, and the eroticism of her body was enhanced by the fact that it was hidden by her clothes.

Why is Yamamoto-san here? I came to this shopping mall with Miyu, but this isn’t a place where girls come alone.

“S-Sorry! I’m in a hurry!”

Yamamoto-san was looking around anxiously, sending lingering glances into the store, and then trying to leave. From behind Yamamoto-san, a man wearing glasses approached.

“Oh… Sotomichi!? Why are you here…!”

“Suzuhara!? What are you doing here?”

The man who didn’t suit the shopping mall at all appeared from the ladies’ store. It’s unbelievable, but this makes sense because of one person.

“W-What? You two… are you…?”

Yamamoto-san, who was looking down, and Suzuhara, who was perplexed but somehow proud. Before I could ask the answer, Suzuhara explained the situation by holding Yamamoto-san’s hand.

“That’s right.”

Suzuhara put on his glasses with a satisfied look. Yamamoto-san and Suzuhara were dating? The school’s most beautiful girl and a geeky otaku? Is that true…? I’m shocked…

“U-Um. Yeah. Sorry, Sotomichi-kun.”

For some reason, Yamamoto-san apologized to me. Did she think I would be hurt because she was dating Suzuhara without telling me?

That’s right. If I were my former self, I would have reflexively punched Suzuhara. If it weren’t for the promise I made to Miyu to introduce me to her girlfriends, I might have cut off my relationship with Suzuhara.

Either way, I’m envious. But why? It’s not that I’m not happy for Yamamoto-san.

Wait a minute. Yamamoto-san had a boyfriend, but why did she do that to me the other day?

“When did the two of you start this relationship?”

Yamamoto-san’s face turned even paler when I asked. She seemed to have realized the true meaning of my question. If they had just started dating today, there would be no problem.

“A month ago. You two were all over each other.”

Suzuhara’s reason for being upset was that he couldn’t stand seeing his girlfriend getting cozy with another guy. Then, that was a problem. Yamamoto-san had excessive skinship with a man who wasn’t even her boyfriend.

“What are you doing?”

Miyu came out of the store, and Suzuhara and Yamamoto-san’s gazes were drawn to her. Then, their eyes turned to me, and it was my turn to be on guard.

“Is this Sotomichi-kun’s girlfriend? You said there wasn’t anyone in our class, right?”

“I didn’t lie. She’s my little sister.”

If she were my girlfriend, it would be better, but I answered honestly without putting on airs. If rumors spread that I was dating a cute, loli, big-breasted girl, I’d be in trouble.

“Little sister!? You bastard… I didn’t know that…”

Why is Suzuhara envious? You have a beautiful girlfriend that a billion people would envy.

“I’m his little sister.”

Miyu introduced herself concisely. She bowed and looked up at her beautiful older sister. She’s my sister, too, but it’s not wrong.

“Is this Yamamoto-san?”

Miyu asked me, either because she had been listening to the conversation or had deduced the information. She immediately noticed Yamamoto-san’s distinctive feature and whispered, “Big…”

“Yes, I’m Yamamoto. Nice to meet you.”

Yamamoto-san smiled and whispered back, “Cute…”

“Onii-chan, and the guy over there with glasses.”

“Suzuhara.”

Suzuhara stated his name with an attitude that was annoyed but a voice that was happy.

“Suzuhara, I’d like to borrow Yamamoto-san for about thirty minutes.”

“Huh? I don’t mind, but why?”

“I want to talk to her.”

When Miyu said that, Yamamoto-san also bounced up and begged, “I want to talk to your sister too!” and Suzuhara agreed with a low bow.

“What about dinner?”

I was left behind, so I asked my sister.

“I’ll eat with Yamamoto-san.”