My Little Sister Is the Best F*p Material - Volume 3 Chapter 02: Miyu's Serious Problem

Volume 3 Chapter 02: Miyu’s Serious Problem

I was on my way home from school the day after Miyu made her strange request. According to Miyu’s warning that she might be in a bad mood the next day, there was a possibility that I could anger her if I made a mistake.

This was a situation that even Miyu, who never used her menstrual cycle or mental health as an excuse, felt the need to declare to me. I should be on high alert, and I thought it was also important to show concern for her.

“I’m home.”

There was no response to my usual greeting upon returning home. Since the door was unlocked, Miyu must have already come back. As I approached the living room, I caught a faint, aromatic smell. It was the scent of cooked fish. The strong aroma suggested that the meal was already prepared, and perhaps my voice didn’t reach her because of poor timing.

I opened the living room door, intending to announce my return once more, but my action was canceled by the shocking scene that greeted me the moment I opened the door.

“M-Miyu…?”

I seriously considered calling an ambulance.

Miyu was lying on the sofa, face down.

Her bag was left on the floor, and her blouse buttons were partially undone, exposing her flattened breasts. Her waist was bare, with even the hem of her camisole showing, and it was the first time I had ever seen Miyu sleep so carelessly since she became self-aware of herself.

“Miyu!! Are you okay?!”

I rushed to Miyu’s side and shook her body. Her back moved up and down, and I could hear her breathing. It seemed she wasn’t unconscious. She could be suffering from overwork or heatstroke.

I took water from the refrigerator, poured it into a glass, and sat Miyu on the sofa, lowering her feet. Miyu tried to open her eyes slightly, but she remained listless. I supported her upper body to make it easier for her to drink, but Miyu’s neck was still unsteady, making it difficult for me to feed her. There was no sign of fever or sweating, and no visible external injuries.

“Miyu, what happened? I brought you some water. Do you want it?”

At my question, Miyu shook her head slightly, just enough for me to understand.

Anxiety and fear were the only things occupying my mind at that moment. As a result, all sorts of thoughts that I wouldn’t normally consider came to mind.

I wondered if she had been attacked by a stranger on her way home, or if she had been bullied at school. I even imagined that she might have been stung by an insect from abroad and was now suffering from a disease.

I didn’t hesitate to undress her to check for any physical abnormalities. I looked for hidden injuries, bruises, or inflammation. I lifted the hem of her blouse to check her back, and as I searched for any abnormalities, my head gradually began to calm down.

“Mmm… Nnyamunya… Fuh, yeah…”

Miyu, oblivious to my worries, leaned against me, making a sound that could barely be considered a sleep talk.

“…M-Miyu? Are you just… sleeping?”

Miyu leaned her weight on me, and her face, which was usually expressionless, was now so peaceful that my tension immediately melted away. This moment of carelessness caused me to lose the strength in my arms, and Miyu’s body was about to slip through, but I grabbed her firmly with both hands.

It was unexpected. I should have just slowly laid her down, but I was worried that Miyu’s head might hit the floor, so I tried to support her body, which was a mistake.

“Oof, sh-shoot…”

I was holding Miyu’s chest through her clothes. Large, soft, and full, it was the texture of Miyu’s breasts that I had wanted to touch so many times but never had the chance to confirm. As expected, it had a certain elasticity, but it was softer than I had imagined, and when I grabbed it, I could feel the thickness of the excess flesh between my fingers, which hadn’t been fully compressed.

This led to a second confusion. Why was Miyu’s chest so soft even though I was holding it through her blouse?

I wasn’t holding Miyu naked. Touching her through her clothes meant that there should be a certain hardness there. Because any girl with breasts this size would surely be wearing a bra.

“She’s not wearing… a bra?”

Unconsciously, I started to knead her breasts. The instinctive softness that clung to the fabric didn’t allow me to hold back. While enjoying Miyu’s breasts, I saw it clearly. A bra with a large cup area, thrown under the table. In my panic, I had overlooked it, but I should have noticed that Miyu was braless when I checked her body for abnormalities.

At this point, it was too late. It was soft and felt good. I wanted to keep kneading it. I wanted to ejaculate in these breasts, even just once before I died…

“Fah… Nn… Wait, why am I here…?”

“M-Miyu, you’re awake! I’m glad!”

I quickly let go of her, releasing Miyu and getting off the sofa.

There stood Miyu, straightening her back and rubbing her eyes.

“Oh, it’s Onii-chan. Good morning.”

It seemed that Miyu didn’t remember anything that had happened since she came home. It was definitely Miyu who cooked the meal, but was there something so shocking that she passed out and lost her memory?

“Good morning, Miyu. It’s not like you to sleep in that state.”

“Huh? Sleep in what?”

It took Miyu a few seconds to understand what I meant, and after looking around, she sighed deeply at her own disheveled state.

“Oh, yeah. Yeah. It didn’t work out.”

“What didn’t work out?”

I asked, but Miyu didn’t answer my question, instead slowly and listlessly putting her clothes back on. When I handed her the bra I had picked up, Miyu touched her own chest a few times before taking it, tilting her head, and putting it on.

I must have left her with a sense of discomfort. Looking back, it was an incredibly risky thing to do. Miyu’s head didn’t seem clear yet, as she was putting on her bra with her breasts exposed in front of me.

I did something bad, but grabbing her was an accident. That’s for sure. As for kneading her breasts, I’m sorry, but that was beyond my control.

“I made dinner, by the way. Want to eat together?”

Miyu, with unsteady steps, headed to the kitchen, and brought to the table a set meal of grilled sea bream and mountain yam. Did she have the energy to make such a respectable dish? Here I was, her brother, having just groped her breasts without her permission, and she had prepared this wonderful meal for me. I was at my lowest. I had to confess my sins.

“Onii-chan, you came home late.”

“There were a lot of things going on.”

“Were you having sex with Kanade again?”

“N-no! I was talking to Suzuhara about… summer break!”

“Oh, I see.”

What’s with that distant look in your eyes? I wasn’t lying, but even if I had been having sex with Yamamoto-san, it wouldn’t have been a problem. If I could ejaculate without thinking of Miyu, it would be a big step towards breaking away from her.

“Oh well. I’m sorry for worrying you.”

“You’re not injured or sick, are you?”

“No.”

Miyu poured soy sauce on the mountain yam and stirred it weakly.

“I also have an apology to make.”

“Huh? What’s wrong?”

I took the soy sauce that Miyu had placed, held the mountain yam in my other hand as a mirroring action, and naturally said those words.

“I accidentally groped your chest while you were sleeping…”

As soon as I finished saying those words, or maybe before I could, a loud thud, “Dunn!!”, sounded on the table right in front of me. I was startled, and then I noticed that the mountain yam I was holding had disappeared, along with the bowl.

Miyu had taken it from me. Not just the mountain yam, but also the grilled sea bream, miso soup, and pickles. Everything except the rice had somehow ended up on Miyu’s side of the table.

“M-My sea bream…”

As the only side dish left was soy sauce, I muttered to myself.

At my words, Miyu glared at me with murder in her eyes.

“I don’t care. Why don’t you pour your own semen on that soy sauce and eat it?”

Miyu took a big bite of my sea bream, then mixed the mountain yam for both of us and poured it into a bowl.

“I-I’m sorry! But when I was supporting your body, it was just bad timing… It was an accident…”

“It’s a good opportunity for you to know just how disgusting your semen is, Onii-chan.”

She’s really angry. I knew she was in a bad mood, but I didn’t expect Miyu to get this emotional.

“I-is it that… disgusting?”

I wanted to avoid an awkward atmosphere, so I tried to keep the conversation going.

“It’s five times stickier than mountain yam and three times more fishy than squid sashimi.”

“It’s that bad…”

“And in the first place, you produce too much. Even adult film actors don’t ejaculate that much.”

Miyu’s lecture continued. Miyu had once studied adult videos to teach Sachiko about sex. It was unfortunate that she now had a point of comparison, even though she was a girl who knew no other men.

“Your semen is too thick. You can’t ejaculate without thinking of me, right? Why do you produce so much sperm?”

“S-sorry…”

“I’m your little sister, you know? Your real little sister, connected by blood. Yet you masturbate every day. Where do you store such a large amount of semen?”

“I-I’m as surprised as you are…”

“You know I don’t like physical contact with others, right? I told you not to touch my breasts in the bath, but you still did. Onii-chan, are you deluded into thinking you’re popular with girls? Without me making arrangements for you, you wouldn’t even be able to have a decent conversation with a girl. Apart from your ability to do housework, all you have left is your sex drive.”

Oh, no. There’s nothing I can do.

There’s not a single thing I can blame on her.

“Pregnancy fetishist.”

“I’m sorry.”

“Pervert.”

“I’m sorry.”

“Idiot.”

“I’m really sorry…”

Miyu’s voice gradually became smaller. Her anger seemed to be subsiding, and she fell silent for a while before quietly continuing her meal.

I didn’t feel like getting something from the fridge to go with my rice, so I decided to eat it with just soy sauce. I didn’t think this would be enough to show my sincerity.

We stopped talking, and the room became quiet. Miyu placed her bowl on the table.

“I’m sorry. Maybe I said too much…”

Miyu apologized with her eyes downcast, looking awkward.

“No, no. It’s completely my fault. You’re not to blame at all.”

I had no intention of repaying Miyu’s kindness with evil. In fact, I wanted to repay her kindness two or three times over. But I didn’t have the ability to do so yet, and I was always a step behind.

“Haa…”

Miyu sighed deeply and looked like she was about to cry.

“I-I’m sorry! I’ll apologize for anything!”

“Yeah. I intended to have you make it up to me, but that’s not what I meant.”

Miyu took the side of the bowl that she hadn’t touched yet and put the overflowing mountain yam back into the container, then returned it to my table.

“Was there something that happened today?”

“Yeah, there was.”

Miyu didn’t continue her story, and I didn’t feel like digging deeper, so we finished our meal in silence. We carried the dishes to the kitchen, and I tried to wash them, but my hand stopped. Miyu was sitting on the sofa, hugging her knees.

“Do you want me to buy you something? Or… maybe… some tea…?”

I knew that the tea I made seriously wouldn’t be drinkable for Miyu, but if there was anything I could do for her, I wanted to do it. Anything at all. If it would make Miyu feel better.

“Thanks. I don’t need anything.”

Miyu mumbled, burying her face in her knees and curling up. I had never seen Miyu so weak before. Maybe I should leave her alone. But then, she might go back to her room. I decided to stay in the living room until Miyu left.

“Today, we had a health check.”

Miyu spoke while looking down.

“A health check? At this time of year?”

“There was an outbreak of seasonal flu in June, and with the midterm exams, it was postponed to this time.”

“I see. And what happened with the health check?”

There’s nothing to the school’s health check other than eye and dental exams and physical measurements, right? I don’t think there’s anything that would make her this upset now.

“Height.”

Miyu mumbled.

“I only grew one centimeter from last year.”

I see, so that’s how it was. But if she grew even just one centimeter, for someone as naturally petite as Miyu, it might not be such a tragic number after all.

“That’s unfortunate. Height isn’t something that effort alone can change, after all.”

“But…”

Miyu continued, interrupting my words.

“My breasts grew four centimeters.”

I could hear the sound of Miyu sniffling. She was crying.

“W-well that’s…”

Breasts, her breasts grew 4 centimeters from just one year?

“If it grew that much, won’t your current bra sizes not fit it?”

“So I bought a new one last month. At that time, it was still only two centimeters bigger than last year.”

The growth of the bust doesn’t always directly affect the cup size. But looking at Miyu, it’s clear that her chest is the only thing that has grown. The four-centimeter increase must have affected the difference between the top and bottom measurements.

“So it increased by more than two centimeters in just a few months…”

I’m not sure if that’s possible, but if it’s true, it means it’s time for her to buy a new bra again.

“I’ve been trying to lose weight lately, but I’ve been suppressing my appetite. I’m so tired… I don’t have any cute clothes… I can’t maintain my shape…”

Miyu lay on the sofa, hugging her body. Miyu, who was already concerned about her appearance, seemed to be deeply damaged.

“Actually… um… how much… do you think…”

I tried to ask something that was on my mind, but my voice became small, realizing that it was too insensitive of me.

“G cup.”

Miyu answered in a lifeless voice.

“It’s already tight. I’m barely able to wear my bra using the outer hook. If it gets any bigger, I’ll have to buy another one. It costs money. My shoulders hurt. The stares of others make me feel sick. I don’t want to leave the house.”

Miyu mumbled, holding her depressed chest. Miyu’s bust size had grown rapidly in the last few months. It was around that time that our relationship changed. I think Miyu got angry when I touched her chest because of that background.

“I-I’m sorry…”

An apology came naturally.

“About touching my breasts?”

“That too. And making you drink it.”

I’ve never heard that drinking semen makes your breasts grow, but it’s hard to believe that it has no effect on adolescent development. And the fact that I made her drink it… I thought Miyu didn’t mind the taste of semen because she never showed her emotions on her face.

“Umm… I can’t say for sure that it’s not the cause… But I agreed to drink it, so I don’t think you should apologize.”

It seemed that Miyu didn’t see the fact that I made her drink my semen as a problem. After all, this relationship wouldn’t have been possible if Miyu hadn’t agreed to it, and it all started with Miyu’s proposal to help me with my masturbation.

“But I should probably stop from now on.”

“If you haven’t given up on getting a girlfriend, you should probably stop.”

“I haven’t given up, but… if I say I want to again…?”

“Now? You want to ejaculate again?”

“Y-yeah…”

“Haa. I don’t mind, but…”

“W-what? Seriously?”

I asked for it, but isn’t this sister of mine’s judgment criteria a bit off?

“You said my semen was disgusting, didn’t you?”

“It is. As I’ve said many times, it’s really disgusting. But being disgusted at something and disliking something are two different things.”

Miyu’s voice, which had completely calmed down, continued with “If I didn’t like it, I wouldn’t drink it,” and I agreed with her, but I was even more confused by the fact that people usually don’t want to drink something that’s disgusting.

“So, do you want to ejaculate?”

As Miyu asked me, my penis swelled with desire. The feeling of Miyu’s breasts, which I had touched earlier, came back to my palms, and my heartbeat quickened as I felt guilty for having groped her without permission.

Ejaculating into Miyu’s mouth was something I could never get tired of, but to ejaculate on a sister who was so down… I couldn’t even consider it…

“I-I want to cum…”

My lower body didn’t hide my true feelings. My penis was clearly visible, even through my slacks. Even though I had made Miyu drink my semen yesterday, I was lusting after my depressed sister.

When it’s Miyu, my reason doesn’t work. I can’t stop myself. In a situation where a normal person would restrain themselves, my body prioritizes my sexual desire when Miyu allows me to ejaculate.

“If you feel like cumming, don’t hold back.”

Miyu lay down on the sofa, caring for her tired body. It was still early for our parents to return home, but there was a possibility that they could arrive in the evening. Moving to our own room would be the safest option, but we both knew that wasn’t going to happen.

“Is it still no good for you to touch the tip like yesterday?”

Having Miyu play with my glans while I ejaculated was incredibly pleasurable.

“I won’t say it’s absolutely forbidden, since it already happened, but I’ll decline this time. It would be no different from me jerking you off.”

I see, that’s to be expected. Even yesterday, it was only barely acceptable because Miyu’s sense had been accustomed to the handjob in the bath.

“Then, how about letting me smell your scent?”

“You really can’t do without wanting to use your sister as a sexual aid…?”

“I-I’m sorry…”

I know it’s strange to want to masturbate using my sister as a sexual aid when things are going well with Yamamoto-san, but when the atmosphere gets serious like this, I can’t help but ask Miyu for help.

“Oh well.”

Is it okay? What a kind sister.

“Not counting my underwear or socks, what do you want to smell?”

“Just the uniform. The shirt you’re wearing now.”

“You don’t want to smell my hair? It’s kind of gross to want to smell a girl’s uniform, like you’re a fetishist…”

“Y-yeah…”

I was being unreasonable. Because of that thing with Yamamoto-san, I had developed a strange obsession with her uniform. I should have just asked her to let me smell her hair.

“But I guess there’s no choice.”

I don’t know what there’s no choice about, but Miyu was unexpectedly cooperative, and she tapped her hand on the area around her xiphoid process – the part of the blouse that was pushed up by her breasts – to show me.

“Here.”

I followed her lead and knelt next to Miyu. It seemed that she was okay with me smelling that spot. It was located on the lower side of her breasts, a place that could be called the reverse cleavage, and it was indeed a fetish zone, but it seemed that this sister of mine had no intention of rehabilitating me.

At that moment, I forgot about breaking away from my sister and took off my pants. I rubbed my penis and brought my nose close to Miyu’s chest and stomach.

“Aah… Suu… Haa… Aaah… My brain is… melting…”

As I filled my nose with air, a numbness spread through my brain, like a drug.

Miyu’s scent was too intense. The sweetness unique to girls. A fragrance of sunshine mixed with the scent of fabric softener and sweat from the cleavage of her breasts.

The hand that was holding my penis was feeling the veins that were popping out. The amount of blood being supplied by my heart was exceeding the capacity of my corpus cavernosum. My lungs were working overtime, and I was even starting to hyperventilate, just from smelling the scent of Miyu’s lower breasts.

“You really like me, don’t you, Onii-chan?”

Miyu whispered, her voice almost lost in my heavy breathing. Miyu, the cause of all my sexual perversions, was like a mother who shaped my sexual desires, and as I smelled her lower breasts, I felt a desire to be spoiled.

“I’ve become too attached to you… Fuh, suu… Haa… To be honest, I don’t have the confidence to get a girlfriend…”

“When will you be able to break away from me?”

“I don’t know… Maybe never…”

“Don’t say that.”

Miyu’s voice was kind. The pressure of the blood pushing from the inside made my penis hurt. Still, the relentless flow of blood made my penis twitch. The pre-ejaculate that was gushing out looked like a scream of agony, with saliva dripping from my mouth.

“Uu… Miyu… Ah… Aaah… It’s making me so horny…”

My fuzzy head felt like it was floating, like it was under anesthesia. It was a minute or so before I realized that Miyu was stroking my head.

From that moment on, every hair on my head began to feel Miyu’s body temperature.

“Aah… Gg… Uuahaa…!”

It was like being caressed on my erogenous zones. With each stroke of Miyu’s hand on my head, a wave of pleasure crashed over me.

“If you feel good, let’s get it over with quickly, brother.”

Even that cold line was like a taunt, urging me to ejaculate.

“Miyu… Haa… Aaah… Miyu…!”

Miyu must have sensed that I was about to ejaculate, as my strokes were speeding up.

“Onii-chan, hold your breath.”

Yet, Miyu gave me an incredibly cruel command. I wanted to scream like a baby, but I had no right to disobey Miyu’s orders, so I held my breath obediently.

The oxygen concentration in my blood was decreasing, and my consciousness was fading. The suffering that the internal narcotic, Miyu, was somehow covering up, was sending out danger signals. The pleasure of masturbation was fading, and my hand was about to stop, when…

“Here, take a deep breath.”

Miyu stacked her hands, which had been stroking my head, and…

She pressed my face into her stomach.

“Nn… Nnnn…!!”

As I inhaled, the hemoglobin, which was seeking to absorb oxygen, was dyed with Miyu’s pheromones. Miyu’s scent filled my entire body, and I strongly gripped the base of my penis, which was already close to ejaculation, and quickly stood up, ejaculating into Miyu’s mouth. It was more like I poured my semen into her mouth than ejaculated, as a thick, viscous liquid flowed out, and Miyu’s mouth was filled with white liquid, so much so that the root of her tongue was not visible.

“Ah… Nmm… It’s really disgusting.”

Miyu mumbled her usual opinion, then turned her face towards the back of the sofa and fell asleep, as if she were sulking.

Why am I ejaculating into my sister’s mouth again, right after I got a chance to break away from her with Yamamoto-san? No matter how much I wracked my brain, I couldn’t find an answer to that mystery. I stood there, feeling pathetic, with my lower body exposed, and gave up thinking for the day.