My Little Sister Is the Best F*p Material

Volume 1 Chapter 05: The Innocent Girl is Erotically Cute

Ever since I started using my sister as masturbation material, my view of women has changed.

Thanks to venting my desires on my sister, I’m not lusting after other girls anymore. Even if I don’t show it, these subtle cues are apparently picked up by girls.

This is actually a good thing. Girls seem to find it unpleasant when they sense interest from a guy they’re not interested in, and for an unattractive otaku like me, just talking to them creates an awkward atmosphere.

“Alright, Sotomichi-kun, can you distribute the social studies printouts?”

A bundle of papers was placed on my outstretched arms.

A school beauty with ample curves, the most popular girl in school, flashed her pearly white teeth in a smile. She was my partner for the day’s homeroom duties.

She was fully aware of her cuteness and tended to leave the work to others. Her cuteness was such that no matter how much she demanded, I couldn’t bring myself to get angry at her. I could feel the cruelty of reality firsthand. She would probably continue to be loved by everyone in the future.

Yamamoto Kanade—an honor student, the very picture of beauty and brains. Her stunning looks captivated people regardless of gender, drawing their gazes like a magnet. And yet, despite the fact that I was assigned to be on class duty with her, my heart had completely forgotten how to flutter. Standing before Yamamoto-san, whose sheer beauty was overwhelming, I came to realize something—I had seemingly lost all sexual desire for anyone other than my little sister.

“Can you even call these twenty printouts ‘countermeasures’?”

During the sluggish period before the end-of-day homeroom, as our classmates chatted away sitting at their desks, we homeroom officers were distributing the massive number of midterm exam countermeasure printouts that had been handed to us by our homeroom teacher with the words, “Here’s a treat.”

Social studies was particularly annoying with its many items to memorize. The subject teacher probably wanted to say that you can do it if you just try, that it’s a matter of motivation, but I wish they’d understand that humans have their limits.

“Come on. Since most of the questions come straight from the printouts, I think this is pretty considerate.”

Yamamoto-san followed me with her hands clasped behind her back. Her work was finished after she distributed the math formula sheets one by one.

What a good life she has. Didn’t she realize that by not doing her work, she was wasting time and giving me more opportunities to chat with her?

“You can say that because you’re good at studying, Yamamoto-san.”

Studying is a matter of effort. I don’t mean to deny that, but I can’t help but feel envious of those who have trained their brains.

“It’s all about attitude. If I said I’d let you touch my boobs if you got a perfect score, wouldn’t you remember all the twenty printouts?”

“I feel like I could do it with ease.”

Boobs, huh? If I brought in a perfect test paper, I wonder if Miyu would at least let me touch her chest.

As I absentmindedly sorted through the handouts, my mind wandered, inflating a fantasy that had no basis in reality. No, this isn’t good—if I let this go any further, something else might end up swelling too. And that would be seriously bad in front of Yamamoto-san.

“Sotomichi-kun…”

Yamamoto-san’s voice suddenly got closer. I reflexively felt a thrill when she spoke to me in her sweet voice. Any man without experience with women would surely fall for this. If I didn’t have a sister, who knows what would have happened to me.

“Are you gay?”

“Wha-!? ”

An unexpected question brought out an odd voice from me, and all eyes in the class were on me. I didn’t know if they were surprised by the suspicion about me or if they were criticizing me for being so close to Yamamoto-san.

“I like girls.”

After clearing my throat, I asserted this, and Yamamoto-san placed her palm on her cheek and tilted her head.

What a cunning girl. Just look at my sister, who is so expressionless and sharp-tongued. I wish she could drink some of Yamamoto-san’s nail clippings, even just a tiny piece.

“Is that so? But you don’t seem to look at me very much. And you don’t seem shy either.”

Does this girl think that all men in the world are conscious of her?

Doubting her mysterious self-evaluation, I thought, but then again, it might be appropriate for someone with Yamamoto-san’s beauty. She probably attracts constant attention wherever she goes.

Considering that Yamamoto-san brought up the topic of boobs, and yet I was thinking about my sister without even giving a glance to her blouse, which was bursting with her ample chest… No wonder I was thought to have lost interest in women.

“Do you like girls with small breasts?”

“No, not at all.”

“Hmm.”

I reflexively denied it, and then, what’s with that smirk?

“I think it’s inappropriate for a girl to use the word ‘boobs’ in the classroom.”

Such a pretty girl should try to be more ladylike.

“Okay, I’ll be careful.”

Yamamoto-san sealed her mouth and giggled.

Just help me distribute these printouts already.

“Sotomichi, you’re talking to Yamamoto-san way too much!”

The one who shouted in the deserted classroom after school was my friend, Takanami. He was an otaku with the same virgin status as me, who played tennis and enjoyed erotic games.

“That’s true. And you’re way too close to her.”

Another friend of mine, Suzuhara, nodded while pushing up his glasses. He was a hardcore otaku who was a member of no club but loved erotic games, just like me. He was also a virgin with no experience with women.

The three of us had been friends since middle school, connected by our shared hobby. Being in a group of three was sometimes a hassle when it came to forming pairs, but thanks to Takinami’s decent communication skills, we managed to get by as this group.

“I haven’t done anything, though.”

I couldn’t deny that I had a slight sense of superiority, but as a matter of fact, I hadn’t done anything. I had been trying to avoid talking to her as much as possible because I knew I would stand out like a sore thumb. It was all because Yamamoto-san was so friendly.

Suzuhara was in a bad mood all day. Was he that unhappy just because I was paired with Yamamoto-san?

“And today of all days, you had to stay after school as a homeroom officer. What’s going on? Weren’t you only interested in two dimensions? You look so happy.”

Suzuhara scowled, wrinkles forming on his nose, as he spoke ill of me. There were many things I wanted to deny about that, but because of my sister, I had strayed from the path of two dimensions, so I couldn’t argue.

At that moment, we were waiting for Yamamoto-san to return from the staff room. We had been given a sudden order by our homeroom teacher to do some odd jobs, such as setting up tables, in the multipurpose room for a reading event for elementary school students.

“Well, it’s not that big a deal, is it?”

Takinami, who admonished Suzuhara with his hands on his head, was absolutely right. You should go to your club.

“Why do you look so happy talking to her… I’m trying so hard myself… and yet…”

Suzuhara spit out an ambiguous muttering, full of resentment. Where did the talk about two dimensions go?

I understand that you’re jealous of me being with Yamamoto-san. If I didn’t have a sister and Suzuhara got along well with Yamamoto-san, I’d probably be just as pissed off. But I don’t know what you’ve been trying to work so hard at.

“Sorry for making you wait~.”

The source of all this trouble, Asu, came bounding into the classroom, stepping over the door sill with both feet. As she landed, her resilient chest bounced. That dazzling smile was now directed at me, and I couldn’t hide my joy.

“By the way, about the setup for the multipurpose room. The volunteers will make it in time, so we can go home.”

Then came the sudden announcement that our homeroom duties were over. I wasn’t particularly sad, but it was annoying to see Suzuhara blatantly flaring his nostrils with joy. I had asked my sister to take care of dinner because I was going to be coming home late.

“Well, let’s go home, Kana… Yamamoto-san.”

Suzuhara picked up his bag and started walking, urging us to go home. Oh well. It was never really work that students should be doing in the first place. That stubborn homeroom teacher must have been told off by the other teachers. I’ll take my anger out on my sister when I get home instead of lamenting the fact that I won’t be walking home alone with Yamamoto-san.

“Alright, let’s go home together, the four of us!”

The one who quickly followed Suzuhara was Takanami. Despite having the skills to win the prefectural tournament, his lack of motivation was a waste. But I didn’t mind that about him.

“What, are we all going home together? Yay! Let’s go!”

Yamamoto-san skipped down the corridor, looking delighted. Suzuhara seemed to want to say something, but he seemed to have decided that it was more important not to upset Yamamoto-san, and he followed her with just a grunt.

Today’s harvest was that Yamamoto-san was a typical circle crasher.

“I’m home.”

Upon returning home, I was tired of dealing with Suzuhara, who had been clingy to Yamamoto-san all day, and I was staring blankly at the shoes in the entrance.

Something about the scenery was different from usual. I couldn’t quite put my finger on what it was, but one thing was certain: the house key was unlocked, so my sister must be home.

I had a cup of tea in the living room and then went up the stairs to go back to my room. Then I heard the sound of a door opening from above, followed by footsteps approaching.

“I’m back, Miyu. My plans for today have been canceled.”

As I climbed the stairs, I congratulated myself on being able to make a proper greeting when I returned home.

“Oh, welcome back. I’m sorry for the intrusion.”

The one who bowed to me was a girl different from Miyu.

“Uh, uh, yeah… uh… you’re welcome.”

I was a little panicked to encounter a girl I didn’t know, like a snake in the grass.

Who was this beautiful girl? From her build, she must be the same age as Miyu, but her aura was incredible. Her lips and tear sacs were thick and distinct, and her resemblance to a living doll was so spot-on that it felt like my whole world had shifted.

“Umm… may I go through to the back…?”

The girl was fidgeting, looking at the toilet behind me.

“I’m sorry.”

I took a step to the side and watched the angel pass in front of me with my eyes.

Even such a cute girl goes to the toilet.

What a silly thing to think. I’d better get back to my room.

“Fuh…”

I lay on my back on the bed in my room. I exhaled deeply and calmed my mind.

I don’t think I’m a lolicon. The girl was small, and her physique seemed to be suited to the kind of hardcore Lolita fashion, but that wasn’t why I was captivated by her.

It was her manner when she bowed to me. She casually brushed her long hair back and maintained a comfortable distance, neither looking me in the eye nor averting her gaze. All of this perfectly resonated with my sensibility.

She was truly pure and innocent. I had even called her an angel, but…

“Should I jerk off…?”

I was lowering my pants. I didn’t know if it was okay to use my sister’s friend as masturbation material.

But I was just so horny. I was unusually excited because Yamamoto-san’s breasts had been in my field of vision all the way home.

I took off my underwear and exposed my genitals. Just thinking that my sister and her friend were in the next room was enough to give me an incredible sense of guilt. My erection, which had sprung up, was attacked by my fingers, which stroked it.

“Mmm… hah…”

Thinking that such a beautiful girl also pees in the toilet, I suddenly felt my brain melt as I imagined the angel’s expression.

Taking off her panties. Exposing parts that she couldn’t show to others. From there, lemon-colored liquid was released. She would probably wash it with a bidet and then wipe it with her hand. I wasn’t very knowledgeable about the awakening of a girl’s sexuality, but did she feel anything at that age?

If she had accidentally touched a sensitive spot while wiping herself, and then fallen into a depravity… If the girl had experienced something like that.

“Grr… fuh… aah…”

My glans were slimy, and my stroking hand wouldn’t stop. It had been a long time since I got excited about someone other than my sister.

Maybe I could cum if I used that girl as masturbation material. I felt something hot rising from deep within my testicles as I hurried my handjob. And then, at that very moment, the door to my room was opened with a “Gacha!”

“Wh-wha…!? ”

I reflexively covered my lower body with the futon, thinking that my sister’s friend had come into the wrong room.

“Onii-chan…”

The intervener of my masturbation was Miyu, who looked unhappy.

She stood in front of me, looking down at me with her stern, slanted eyes, and my dick, which was in a pinch, rose up in defiance.

“Wha-what? Where’s your knock? I told you to be careful!”

“You said you weren’t coming home today, Onii-chan.”

Miyu lowered herself to her knees in front of the bed. Her expression was sullen, but she didn’t seem angry.

“My plans were suddenly canceled. If you had a friend coming over, you should have told me, and I could have gone out somewhere.”

“Well, I had my reasons. I really didn’t want you to know about it.”

Miyu looked down, looking apologetic. I had a pretty good idea of what was going on.

“That girl?”

“Yeah. Her name is Haruka. You met her when she went to the toilet.”

I met her, and that was a problem. Was it because she thought I would fall for her friend?

“Then I felt an evil aura, so I came here.”

I was very sorry that it turned out exactly like that.

“I came here impertinently for a reason.”

Miyu stood up straight, looking serious, and looked me in the eye. Then she shifted her gaze to the center of the futon and looked back at me. The reason she gave seemed to be hidden in the futon.

“Stand up.”

I obeyed Miyu’s request and stood up. As I moved the futon aside, my still-hard penis appeared, and Miyu grabbed my waist with both hands as I stood up.

“Release it.”

Miyu’s voice, full of sincerity, reached my eardrums, and my penis twitched. My sister had commanded me to release my sexual desire in the room next to where her friend was.