My Little Sister Is the Best F*p Material - Volume 3 Chapter 01: Everyone has their own secrets they can't share with others.

Volume 3 Chapter 01: Everyone has their own secrets they can’t share with others.

I’ve reached a point where I can only ejaculate if I imagine my little sister’s naughty side or if she watches me climax. I’ve even gone as far as getting a girlfriend and losing my virginity to try and fix this unhealthy habit, but this peculiar fetish persists. I’m starting to develop romantic feelings for my sister, so I’ve decided to reevaluate my relationship with her, Miyu, as the summer break and the end of the school year draw near.

Even without a girlfriend, the scenery on my way to school remains unchanged. I never went to school with her, and I didn’t tell anyone in class about our relationship. As I enter the classroom, I see the same familiar faces, and the weekly routine of lessons begins, as it does every day.

“Yo, Sotomichi. You look a bit glum for someone whose summer break is just around the corner.”

The first person to greet me in the classroom is usually Takami, fresh from morning practice. His familiar, silly face is like a tranquilizer for my mind. And emerging from behind him is Suzuhara, his forehead hair now permanently swept up.

“Come on, Sotomichi. Don’t be such a downer. Summer means the beach, right?”

I’m at a loss for words, wondering who this person is, but I find his rapid transformation amusing. He’ll probably be tanned and dark by the end of summer.

“I’m not glum.”

I have my own fair share of troubles and enjoyments in life. When I get home, my sister has dinner ready for me. I don’t envy your sweaty, passionate youth at all.

“So, do you have any plans at all?”

Takami wipes his hair with the towel slung over his shoulder. For those like Takami who are involved in club activities, their schedules are mostly filled up during the summer break. Not only sports clubs, but also students who participate in voluntary choir or dance performances and competitions. They probably can’t understand why someone like me, who doesn’t belong to any group, wouldn’t travel at least once. Unless I am busy with a part-time job or studying, but I’m neither.

“I’m thinking about it, but I don’t have any plans yet.”

Miyu also stays at home a lot, but she’s decided to travel with Haruka. It’s going to be a luxurious trip by plane or ship. Our vacations are just too different.

“Then why don’t you come to a off-line meetup, Sotomichi?”

Suzuhara, having heard my answer, interjects with a proposal.

“A friend I met through an online game is organizing an event. If you’re free, you should be able to play two games simultaneously on your computer and smartphone during the summer break, right?”

An off-line meetup. It’s smart to join a group of cheerful people and compete in your area of expertise.

“I’ll consider it. Just send me the details later.”

“Okay. … You know, you should try to get a girlfriend for just one summer.”

Suzuhara pats my back and returns to their seat. They’ve become such a senior in life after just one relationship. Is that how much a person can change with just one girlfriend? As for her, the former girlfriend, she’s also completely recovered.

“Hey, hey Kanade-san, do you really know the range of the math homework? I want to get it done before I meet up with senpai.”

“The page numbers in the exercise book have been given to us by the teacher. I’ll send them to you later.”

“Yaaay! You’re so reliable Kanade-san!”

“Fuhhehe. Praise me, praise me.”

Yamamoto-san, who is now more popular than ever throughout the school, still receives confessions from multiple boys without interruption. Even those with no hope of success call on Yamamoto-san to confess their feelings. Especially the third-year students who will graduate this year, they follow one another like a queue, and Yamamoto-san, unable to refuse their invitations, seems to be having a hard time.

However, this is only my perception because I know Yamamoto-san’s situation. For those who talk to Yamamoto-san, who is friendly with everyone, it’s not surprising that they might mistake her friendliness for romantic interest.

Even now, from this distance, our eyes meet.

Yamamoto-san, due to her beauty, avoids unnecessary negative emotions. Miyu, on the other hand, avoids having her alone time disturbed. They’re always mindful of their surroundings. That’s just how smooth operators are.

The lessons for the day ended without incident. And as I was getting ready to leave school, thinking about my summer plans, Yamamoto-san approached me. She pushed her side hair behind her ear, her large breasts straining against her blouse, and I’ve become so accustomed to this beautiful girl talking to me that I’m no longer surprised.

“Is there something you need?”

“The teacher is calling for you. He wants us to go to the staff room together.”

Why such a sudden request?

There’s no reason for me, who has lived a pure and righteous life, to be called to the staff room.

“You were asked to help with the preparation for the reading event, weren’t you? The reason you were appointed was because I was supposed to help with the pamphlet and support the reading.”

So, even on that day, I was just dragged into it, huh. Well, there probably aren’t many boys who would object to working with Yamamoto-san.

“There’s some follow-up work to be done, so we decided to do it all at once.”

And so I find myself entangled once again.

Oh well. I’ll help her out as a favor for being day duty partners.

“—Is he really the best choice?”

Upon arriving at the staff room, the first words out of our homeroom teacher’s mouth were those. Sure, he’s an insignificant existence in the class, but I expect a little more respect since I’ve come to help.

“We were day duty partners together.”

“I see. That’s not a bad choice in terms of public image.”

It makes sense that a boy who pairs up with Yamamoto-san would become the target of jealousy, so it’s understandable that a low-key and unnoticeable person like me was chosen. But I was brought here because of my day duty responsibilities, not because Yamamoto-san chose me. What do you mean, is he really the best choice?

“Here are the keys to the archive room and the multi-purpose room. Do you know how to use the shredder? If you can’t find the lost item, it’s probably gone for good. After all, it’s been quite some time since the last cleaning.”

The teacher gave us our instructions, and there were three things we had to do. First, we had to look for a key chain that a child who came to the reading event had lost. Second, we had to dispose of the remaining pamphlets that had been left in the archive room. And third, while we were at it, we had to bring the printouts that were to be distributed the next day to the classroom.

Yamamoto-san and I checked the lost and found box, and then we asked the class responsible for cleaning the multi-purpose room if they had seen the key chain. Both efforts were in vain, and after spending a few minutes searching unlikely places in the multi-purpose room, we found nothing.

“It’s not here.”

“It shouldn’t be. It’s been weeks since it was lost.”

Rather, I wonder why the search request came at this timing. Did they not realize it was lost? Or had they been searching for it but hadn’t thought to look at this school? In any case, it’s too late.

“Hey, Sotomichi-kun, don’t you have any troubles or concerns?”

Yamamoto-san was sitting with her legs together on a chair with casters. Her slender bare legs extended from under her skirt, and it was incredibly alluring. I think it’s a bit early to give up, but maybe Yamamoto-san isn’t as serious and pure as she appears.

“What’s with the sudden question? I don’t have any particular troubles…”

I do have some. My serious problem is that I can’t ejaculate unless I use my sister as a sexual aid. But I can’t possibly share such a serious problem openly, and even if I did, it would be hard to convince others.

“Didn’t you say you had a problem before?”

“There are some problems you can’t talk about. Isn’t that true for you, Yamamoto-san?”

In the end, I never got to hear about Yamamoto-san’s problem, which apparently led to her relationship with Suzuhara. It wouldn’t be fair for me to reveal my problem without hearing hers first. My problem is a much more sensitive topic than the everyday troubles most people face. I don’t want to be disliked by Yamamoto-san.

“If you want me to talk, I can tell you about it… It’s not a problem, but is there anything you want me to do for you?”

“Do you need me to?”

“Not exactly.”

Yamamoto-san gave a stiff smile and tried to brush it off. Of course she needs me to. Just as I was about to press her further, the members of the wind instrument club came in to practice, and we had to give up our search. Then we moved to the archive room, where we were to shred the unnecessary pamphlets and the documents Yamamoto-san had collected to make them.

There I was, working diligently, when the school idol, with her arms crossed and her heavy breasts lifted, was doing nothing but stimulating the sexual curiosity of the boys. Even though there was only one machine, this person really didn’t do any work at all.

“Um, Sotomichi-kun? Besides listening to my problem, is there anything else you want to do?”

Yamamoto-san, who is unusually insistent, looks at me with an expectant gaze. She’s trying to get me to reveal something specific. Her blatant approach makes me want to probe her as well.

“Why can’t I just hear about your problem?”

“It’s not that you can’t, but it’s a trivial problem from my perspective, and I think you wouldn’t understand even if I told you…”

“My problem is similar.”

“Then let’s exchange our problems! I’ll definitely solve yours if you tell me!”

“No, no, no.”

I do have the desire to confide in someone about this problem. I want to tell as many people as possible, have them take me seriously, and find relief, even if they don’t understand. But this is a problem that goes against my humanity. It’s like asking for advice on how to deal with having killed someone. People can sympathize with pain, but they can’t accept a twisted humanity.

“Are you sure? You can tell me anything. Like that boy who was going to confess to me after school, don’t you have any desires you want to unleash towards me?”

Yamamoto-san, with a relaxed smile, unbuttons her blouse, revealing her cleavage. What was hidden under a T-shirt until we entered the archive room, is now just a bra, and the blouse is now translucent, showing skin and lace. I was with her the whole time we were moving, so when did she take it off?

“When someone confesses to you, what do they say?”

I take a step back, tempted by the delicious reward Yamamoto-san is offering, and interject with another question. I know that Yamamoto-san wouldn’t play a mean prank like that. My attitude is more of a habit formed from past experiences.

“It’s pretty normal? Being called into a private room like this, and saying, ‘I like you, please go out with me.’ It’s just a boy with an inflated pair of trousers asking me.”

Yamamoto-san chooses her words carefully, her voice seeming to exude a hint of hardship, yet also pride in the situation, and her female heart reveals that she is pleased to be asked, even if it’s troublesome.

“Anyone would feel the same way if it was Yamamoto-san.”

I speak honestly, feeling guilty, remembering when Yamamoto-san performed an ear fellatio on me in the classroom. At that moment, when I caught a whiff of her sweet pheromones, my male instincts realized that no man could resist his reproductive urge towards her.

“That’s right. Except for you, Sotomichi-kun.”

Yamamoto-san presses her index finger against the center of my chest bone.

“You won’t make this big unless I come on to you, Sotomichi-kun.”

Then, Yamamoto-san lowers her hand from her chest to her crotch, pouting and poking my penis through my pants. Yamamoto-san is concerned about who I have my heart set on. This interaction is a continuation of the skinship we had with each other under the stairs.

If it weren’t for my sister, I would have jumped at Yamamoto-san’s proposal. But I don’t want to hurt her like I did before, when I couldn’t ejaculate. Yamamoto-san seems to have a lot of pride in her body.

“I want to make it clear that I also want to have sex with Yamamoto-san.”

Yamamoto-san highly regards me as a monk, but the difference is only in the direction of my sexual desire, whether it’s towards my sister or a classmate. I understand Yamamoto-san’s feelings that my desire not being directed towards her is unacceptable, but I can’t help it.

“So it’s because of your problem that you can’t, right?”

“Well, that’s the case… So that’s why you wanted to hear about my problem?”

“Half of it is correct.”

Yamamoto-san smiles smugly. Why doesn’t she just ask me directly? There must be another reason for her not doing so.

If Yamamoto-san is truly willing to have sex with me, I am eager to take her up on the offer. I have a mission to distance myself from my sister, and with Yamamoto-san as my partner, it might not be a dream. Above all, I can’t help but feel as a man when I’m being tempted like this.

At this point, I might as well give it a try. There’s one thing I’ve learned from my experiences with Miyu: the most simple and effective choice for a man to make, in order to avoid making a girl feel sorry for him after sex, is to act on his desires.

“I also have another half to my story. There’s one more misunderstanding.”

“Huh? What is it?”

Yamamoto-san stares in surprise for a moment, then asks, feigning calmness to hide her surprise.

“You said that if I asked, you’d do anything, even the most lewd things, right?”

“There’s no misunderstanding. This time, I’ll do anything, even the most lewd things, for you. It seems like I still haven’t made up for the last time.”

Yamamoto-san is relieved by my words and invites me with a seductive look. She probably thinks I’m going to ask her for a blowjob. While fellatio is my favorite among the various plays, if she’s willing to do anything, the situation changes.

“Then can I just tell you what I want?”

“Yeah, yeah! What do you want me to do?”

“I want you to give me a titjob while wearing your uniform, and I want to ejaculate inside your clothes.”

As I answer according to my desires, Yamamoto-san takes a breath, her eyes sparkling for a moment, and then she turns her slightly blushed face away from me.

“Is something wrong?”

“No, nothing.”

Yamamoto-san smiles shyly, her face glowing with a cute blush. It’s an unexpected reaction.

“Yamamoto-san… Are you okay…?”

I intended to push through with my momentum, but instead, I’m the one taken aback. Maybe Yamamoto-san’s head is messed up from being confessed to too much. Otherwise, this pure and lovely beauty is just a pervert.

“Do you want to ejaculate on my breasts?”

Yamamoto-san, with her thick lips, emphasizes each word as she repeats her question, seeking confirmation. This eroticism is an adult temptation that I have no resistance to, and my penis has become rigid, as if an iron core has been inserted from behind. Yamamoto-san, noticing my excited state, smiles happily.

“What should I do? Your request was more lewd than I expected, so I might be a little mean.”

Yamamoto-san talks while pulling out my penis. In this public place, the school, I am once again exposing my genitalia. Yamamoto-san, who has moved behind me, stretches her arms around my waist.

“If you want to ejaculate inside my breasts, I’ll let you. I’ll prepare for the insertion, so hold back your ejaculation until then.”

Yamamoto-san, with hands twice as big as Miyu’s, wraps her hands around my penis. Then, she rubs the bulging glans with the extra skin, coats it with the pre-ejaculate that leaks out, and improves the lubrication. Until enough Cowper’s fluid is produced, I have to endure the handjob as a substitute for the titjob lotion.

“Yamamoto-san… So, that… H-ah, ah… It’s too good…”

“Ufufu. I’ve seen you erect many times, but this is the first time we’re having sex.”

Miyu’s handjob in the bath or toilet, even though it was done roughly, was quite pleasurable. That was due to her natural dexterity and the fact that she had observed my masturbation many times.

However, Yamamoto-san’s handjob surpassed that level in just a few seconds. After a few strokes, my entire shaft was covered in pre-ejaculate, and Yamamoto-san, who had been slowly rubbing back and forth at first, soon switched to a faster handjob, unable to contain her impatience.

“Ah, ah, ah… Yamamoto-san’s hands… It feels so good… Uu, aah… This is so… Aah…”

“Sotomichi-kun’s penis is so hard and wonderful… I can even feel it pulsating… H-ah, what should I do… I just want to keep touching it…”

Yamamoto-san, with her long fingers, caresses my penis from the glans to the base, yet she speaks with a voice that exudes joy, as if she’s touching an erect penis for the first time, despite already knowing the erogenous zones of my manhood better than my own right hand.

“Y-Yamamoto-san, suddenly like this… Aah, ah, it’s dangerous… I’m going to cum, I’m going to cum…”

“Huh? You’re going to cum? But you’re still holding on, Sotomichi-kun… Moan more… Feel more with my hands, Sotomichi-kun…”

Yamamoto-san, with a look of ecstasy visible even in profile, wraps her arms around me from behind and continues her handjob. Her plump body presses against mine, and we resemble a passionate couple in a back hug.

“U-uh, uuh… Aaaah… I’m going to cum…”

My penis has already received enough stimulation to ejaculate. Rather, I’m already ejaculating. My brain is releasing the same amount of pleasure chemicals as an orgasm, even though no semen has been released.

“Sotomichi-kun’s penis is twitching, begging for release… It’s so cute… You’ve held on for so long. Well then…”

“Let’s do it with my breasts.”

Yamamoto-san whispers those words in my ear.

And then, just as we were about to continue, we heard a knock on the door: “Knock, knock.” Yamamoto-san and I quickly stopped our activities and straightened our clothes. My crotch, even with my pants on, was still too prominent to be shown to anyone, so I resumed cutting the documents in the back of the room, and Yamamoto-san opened the door to deal with the unexpected visitor.

“Why did you lock the door?”

It was our homeroom teacher. Yamamoto-san had removed her T-shirt to reveal her bra, so if we were accused of engaging in impure heterosexual relations, it would be difficult to explain.

“I thought it would be troublesome if someone saw me working alone with a boy.”

“I see. Well, it’s fine. Are you still processing the documents? It seems you’ve been searching diligently, which is a big help, but I have to leave school for an errand, so please wrap up soon.”

“I understand. I’ll just leave the printouts and go.”

Despite the unusual situation, the teacher, impressed by Yamamoto-san’s composure, didn’t press further. Still, the teacher wanted the key back, so we couldn’t stay in the room. Yamamoto-san skillfully covered my crotch, and then I quickly rushed to the nearby toilet, locking myself in a stall.

The T-shirt Yamamoto-san had been wearing was hidden on a shelf in the archive room, and she had put it on just before opening the door, so it seemed that no one suspected we had been having sex. After my heart rate calmed down a bit, I opened my smartphone, intending to watch a video to make my penis go limp, but…

(Huh? What’s this?)

There was a message on my phone.

“Usually, I’d notice before someone comes, but I got too carried away this time. I’m sorry I couldn’t let you ejaculate again. Next time, I’ll let you cum inside me, so see you tomorrow, Sotomichi-kun!”

The sender was Yamamoto-san.

Reading the message, I was intensely confused.

“What? Seriously? You’re leaving? … And how do you know my account…?”

One unexpected event after another, and my exhausted mind finally caused my penis to shrink conveniently. Still, I couldn’t move for a while, and I sat on the toilet, staring at the ceiling.

Even with Yamamoto-san’s skilled handjob, I should have been able to ejaculate if Miyu was the one doing it, but I still couldn’t cum with Yamamoto-san. I can’t believe it, but is it really true that I can’t cum with anyone but Miyu? If I can’t cum with Yamamoto-san, then there’s no hope for a solution. I can’t give up just yet.

(But… Yamamoto-san seems serious about me…)

The words I had previously thought were just polite social pleasantries now seem to be sincere from the heart. That could also be one of the reasons why Yamamoto-san receives so many confessions. But even if I no longer see Yamamoto-san as a woman, would she really come on to me like this?

(Normally, you don’t have sex with someone you don’t like, right? Miyu, Yamamoto-san… Why are these girls so mysterious?)

(Ah, I’m so horny. I can’t take it anymore, I have to go home and jerk off. I need Miyu to drink my thick cum.)

So, I returned home, still carrying an extraordinary amount of sexual desire, making sure my penis didn’t get erect again.

I walked home at a brisk pace, sweating profusely, but even taking a shower felt like a waste of time. I just washed my face, adjusted my body to the air conditioning, and then went straight to the living room.

“I’m home, Miyu.”

Miyu was leaning against the sofa leg, reading a fashion magazine. She seemed bored, and I was sure she would drink my semen. I was ready to ejaculate immediately.

“I’m sorry, but I have a favor to ask.”

“Okay, okay.”

Before I could finish explaining, Miyu folded the magazine and placed it on the table, then sat in seiza in front of me and raised her face.

“Go ahead.”

It seemed that Miyu had realized I wanted to ejaculate. Her ability to read my emotions was useful in situations like these. That’s why she was able to take care of both Sachiko and me so skillfully.

“I have a lot of thick cum again, but is it okay?”

At my question, Miyu lowered her eyebrows and made a face of annoyance.

“I knew you were horny, given that you’re asking me for a favor right after you got home. What got you so worked up?”

“At school, with Yamamoto-san. We had a lot going on.”

“Something sexual?”

“Something like that.”

In response to my answer, Miyu just stared at me with a serious expression. The fact that I was excited about a girl other than Miyu was a step towards breaking away from her. So, from Miyu’s perspective, this development should be welcome.

“Yamamoto-san has been friendly with me lately. She even offered to listen to my problems, and the atmosphere has become more intimate, so maybe it’s a good sign.”

“Then I don’t have to drink it, do I?”

“W-well…”

That’s right, that’s what it means to break away from my sister.

“It’s fine.”

Miyu raised her chin slightly and stared blankly at me, and I’ve become quite adept at interpreting this as a request to ejaculate quickly. But it’s meaningless once I’ve broken away from her. I felt a sense of loneliness, as if I were being blown by a cold wind, but I rubbed my exposed penis, driven by my lust.

“I’ll cum soon… so…”

As I masturbated in front of Miyu, I felt a growing sense of guilt towards Yamamoto-san. She highly regarded me, and yet I was doing these things. Maybe it was wrong to engage in sexual activities with my sister after all.

Miyu remained silent, and it didn’t seem like she was particularly happy about the prospect of me breaking away from her. Instead, she seemed to dislike the idea of drinking my thick semen. However, she had once told me that she wouldn’t drink my semen because it was bitter when it was accumulated, but her attitude had softened significantly since the incident in the bath, and recently, she had allowed me to ejaculate in her mouth.

If I become able to ejaculate with someone other than Miyu, I won’t need her to drink my semen anymore. I might never get the chance to ask her why she has been accepting my ejaculations, but it’s time I moved on from a lifestyle where I rely on my sister.

“U-uh, fuu, I should be cumming soon…”

I rubbed my shaft hard, but thinking about a life where I couldn’t ejaculate with Miyu made me feel lonely, and my mind was distracted, preventing the switch to ejaculate from being flipped. I wanted to release my lust, but I didn’t want to take too much time and inconvenience Miyu.

“Can you help me a little?”

“Huh? What do you want me to do?”

Miyu opened her eyes wide, as if waking up from a dream.

“Can you touch the tip of my penis with your finger? Just the tip.”

This was a request that Miyu would have definitely refused in the past, as it was her own will to touch my penis. Still, Miyu didn’t make a disgusted face or spit venom like she usually would.

“With my finger? Like this?”

Miyu extended her index finger and caressed the glans of my penis, which I was gripping and rubbing with the skin, spreading the pre-ejaculate with the pad of her finger.

“Un, ah… Ah, it feels good… I’m about to cum…”

My body, more excited by the fact that Miyu was touching my penis than by the physical stimulation, sent nerve pulses to my brain, urging it to ejaculate.

“Unn… Ah, Miyu, I’m cumming…! Open your mouth and drink it…”

“You’re quick when you’re about to cum.”

Miyu opened her mouth as I requested, and without asking, she placed her tongue on her lower lip, and I shot my white liquid, byu, byu, onto her tongue.

“U-uh… Fuh… H-ah, it feels so good to cum in Miyu’s mouth.”

“I’m glad you enjoyed it.”

Miyu swallowed the semen into her stomach, then wiped the corners of her lips with a tissue.

“I wonder how much I’d cum if I did it directly in you mouth.”

“Please don’t make me imagine that.”

Miyu sucked and licked the residue of semen from her fingertips, advertising the difficulty of swallowing semen while being careful not to get it caught in her throat. This sister of mine, who does all this, why won’t she give me a handjob or a blowjob?

“Are you all better now?”

“Yeah. Thank you.”

I put my penis away and pulled up my pants.

“Now, I have something to ask of you, too. I have a favor to ask. Is that okay?”

“Wow! Go ahead. I’ve been relying on you for help, so I want to do my best to assist you.”

A request from Miyu is something I would be happy to receive. I can’t miss this opportunity to repay her kindness.

“It’s not about doing something specific. I might be in a really bad mood tomorrow. I don’t know how to explain it, but I’d be happy if you could be careful.”

“Of course, I’ll be careful.”

Tomorrow is just a regular weekday, right? Is there a special event at school?

“Okay.”

With that, Miyu left the living room and returned to her room. Her back, as she climbed the stairs, was the same beautiful and well-proportioned figure as always.