My Little Sister Is the Best F*p Material - Volume 3 Chapter 13: Big Brother's Semen and Little Sister's Love

Volume 3 Chapter 13: Big Brother’s Semen and Little Sister’s Love

After finishing my time with Yamamoto-san, I returned home and headed straight for the bath, feeling refreshed. Since I had stayed behind with Yamamoto-san for quite a while after school, it was only natural that Miyu, who had gone home earlier, had already prepared the bath for me.

Even after calling out, “I’m home,” Miyu didn’t appear, and the house remained eerily silent. It was a bit concerning, but she was probably just focused on studying in her room.

After having my release with Yamamoto-san and experiencing my first walk home with a girl, I was thinking about Yamamoto-san all the time. She was still cute, and on top of that, she liked to serve others, so spending time with her was just comfortable. Even though I had cum with her twice, I was already looking forward to the next time.

We hadn’t set a specific date for our next meeting yet. After getting out of the bath, I checked my smartphone, which was in the changing room, to see if there were any messages from Yamamoto-san, then dried my body, dried my hair, and checked the screen again, even though there was no notification sound.

Yamamoto-san seemed to have a part-time job, so it wasn’t possible to meet her tomorrow anyway. Plus, I had been ejaculating a lot lately, and there hadn’t been a day when my body could rest. Sex with Yamamoto-san seemed to be a battle of endurance, so I needed a period to take care of my body and testicles.

Since I went straight to the bath after returning home, I didn’t have any clothes to change into. My parents weren’t home, and Miyu was supposed to be studying, so I didn’t have to worry about being seen. So, I entered my room completely naked.

I put my uniform and belongings on the floor and reached out to the pajamas I should have placed on the bed to change into. That’s when it happened.

“Uooaaahh!?”

I couldn’t help but scream at the shocking sight, which was even more shocking than the last time.

“M-M-M-Miyu!?”

Miyu, whom I thought was quietly in her own room, was sleeping on the bed in my room. And she was naked, as far as I could see from outside the blanket. There were no clothes in sight, and she either took them off inside the blanket or went straight to my room naked from the bathroom, as I had.

“Nnh… Fah… Ahh… Uun…”

Miyu woke up from my loud voice. Her lustrous skin and rounded breasts, which defied gravity, as she propped herself up on both hands, sent the fast blood flow from the bath rushing to my groin.

There was a tissue, presumably used to wipe the dirt off her hands, on the bedhead, and I desperately tried to make sense of this already questionable scene. My thoughts were so focused on that that I hadn’t realized the danger of being naked myself.

“Mmm… Huh? Onii-chan…? Fue? Eh!?”

When Miyu woke up, the first thing she saw was my naked body. Just like me a moment ago, Miyu didn’t seem to understand her situation yet. She might even think she was in her own room.

“Umm… Umm… O-Onii-chan, wait, c-calm down…! It’s a bit too early for that…”

Miyu thought I was about to attack her. In that case, it was a difficult choice whether I should explain why I was naked or ask Miyu why she was naked.

“I just out of the bath! Miyu, why are you sleeping in my room? In… in that…state…?”

I explained the situation in one breath and first made her understand that this was my room. Then, Miyu’s whole body became active, as if she had been boiled in hot water, and she was enveloped in a blush that could be seen in the color of her skin.

“This… Umm… Eh? What? Why…?”

Miyu’s eyes were shaking, and she was desperately trying to hold back her tears, looking at me with her eyes, asking for a reason why she was naked. It seemed that Miyu remembered what she had been doing, and at the same time, she was regretting falling asleep. Since we had been in similar situations before, it wasn’t too difficult for me to read her emotions.

However, I didn’t understand why Miyu, who was usually thoughtful and careful about everything, kept making so many mistakes. Was it because her bust size was getting close to an H-cup that it was affecting her so much?

“I want to change clothes first, but where did you put my sweatpants?”

I was only wearing my innerwear and was looking for my pajamas. Even in the summer, I would use them for two days if I didn’t sweat at night, so I should have left them on the bed.

“Eh, where are they… I don’t remember anything about entering this room…”

Miyu reached into the bed with a hazy consciousness and luckily found the pants hidden there, saying, “I found them,” and pulling them out with a sense of relief. I took the pants and quickly put them on, covering my crotch, which was about to get erect again because of Miyu’s sexy appearance.

At that moment, my knee, which was touching the pants, felt that part of the pants, which was raised to my waist, was wet. When I looked at the pants again, I saw that there was a stain spreading from the crotch, as if I had wet myself. Since the pants were in the bed where Miyu was sleeping, there was no doubt that this was caused by Miyu. However, it wasn’t a blood stain from her period, and there was no urine smell either. Then, the only thing that could have caused this large stain was…

“Waah, waaahh, that… that… that is…!”

Miyu noticed the stain on her pants at the same time as me—no, she remembered it, and she shouted out loud, erasing my thoughts.

However, there was no way to hide this situation anymore. The stain was from when Miyu, wearing my pajamas in my room, masturbated and came, soaking my pajamas with her love juice. There was no other explanation, and after all the interactions we had, we had no choice but to talk openly now.

“Hey, Miyu. I want you to answer honestly. Was this… everything that led up to this… your full will?”

If she had mistakenly entered my room, that would still be understandable. If she had been extremely tired, as she used to be, and had almost unconsciously gotten into bed after taking a bath, I could understand that too. If she had masturbated there, that would also be a natural flow of events.

But, Miyu and I have been doing naughty things together all the time. Regardless of Miyu’s explanation, she has given me handjobs, titty-fucks, and even licked my semen after I came. So, it was more natural to think that Miyu’s decision to masturbate in my room was her own.

“It’s… that…”

Miyu squeezed out her words in a very small voice.

“I can’t answer that…”

Even in this situation, Miyu didn’t want to tell me everything. Rather, it seemed that Miyu herself didn’t understand herself well enough to explain everything.

“I knew this was your room. I knew it was your bed, and I did what you imagined. But, I can’t answer your question.”

That was the limit of what Miyu could tell me. It was too difficult for me to understand what was right and what was wrong, and I couldn’t read the meaning between the words of her answer.

Still, it seemed that Miyu was aware that she had masturbated in my room, and as a result, she had soaked my pajamas with her love juice. Understanding Miyu a little more by knowing this was certainly a step forward, and I didn’t want to interrogate Miyu, so I decided to leave the rest to the future.

“I see. Then, let’s leave it at that.”

“Are you going to make your little sister clean up for you again?”

“You figured it out.”

Miyu seemed uncomfortable with the situation, so I decided to blow it away with my sexual desire. I thought that was the only comfort I could give her.

“Can you drink it?”

“It’s your fault I’m like this. Are you still going to make me drink it?”

“Because my penis is standing up for your naked body.”

“Gnuu…”

Even though Yamamoto-san had made me come twice, my sexual desire for Miyu was limitless, like a broken faucet. I felt like I could come as much as Miyu would let me.

I didn’t fully understand the meaning of her statement, “It’s your fault I’m like this,” but I could tell that there was a connection between her drinking my semen and her masturbating in my room. That was enough for now.

“You really are something, Onii-chan. What do you even think your little sister is?”

“A sister who masturbates in her brother’s pajamas deserves this treatment, right?”

“Ugh! I get it! I’ll drink it, if that’s what you want, just hurry up already!”

I took off the clothes I had just put on, showing off my penis, which had become much thicker. I felt like my penis had become more impressive since I started having sex with Miyu. Miyu was hiding her privates with her arms and knees and glaring at me.

“It’s fine even if it’s just when I am about to come, can you give me a blowjob?”

“Why do you think I will?”

Because you gave me a cleaning blowjob yesterday.

… I shouldn’t say that, though.

“Yamamoto-san did it for me.”

Instead, I told her about what happened today. I told her as one of the reasons, with no other intention. This was the usual, heartwarming interaction between siblings.

“Is that so?”

As I talked about my lovey-dovey talk with Yamamoto-san after school today, Miyu gradually became calm and returned to her usual serious expression.

“I support your relationship with Kanade.”

From now on, I will have sex with Yamamoto-san and be able to come with other girls besides Miyu. If this problem is psychological, I should be able to get along with other girls too. So, I will gradually come to like Yamamoto-san or someone else, not Miyu. I have to do that. But…

“Hey, I’m sorry if I’m wrong but…”

Miyu, who should be the happiest in this situation, didn’t seem happy at all. Rather…

“Miyu, don’t you get irritated when I talk about Yamamoto-san?”

I need to break away from my sister, so I report on the progress of my relationship with Yamamoto-san as something desirable. Yet, Miyu, who told me to break away from her gets colder every time I make that report.

I asked that question, knowing that I had stepped into a core issue, and Miyu, still hiding her naked body in the corner of the bed, opened her mouth.

“I won’t deny it. I do feel really bad for interfering now that Onii-chan is finally getting along with Kanade-san.”

Miyu’s answer was more than I expected, but it was exactly what I expected. The fact that she was getting angry when I talked about Yamamoto-san meant that she was feeling jealous, didn’t she?

“That said, please don’t delude yourself into thinking your little sister is in love with you. It’s not like I see you as a man or anything.”

It seems that it’s not a simple girl’s heart that’s making her feel this way. As we talked about before, I haven’t been able to show Miyu my manly side, so there’s no change in the fact that she doesn’t have any reason to fall in love with me. So, I couldn’t help but believe that Miyu’s words, “I don’t like you as a man,” were true.

Still, Miyu likes me, and because sibling love is not allowed, she is trying to make me break away from her. I thought that Miyu only cleaned up my semen because, as Yamamoto-san said, she was thinking of herself as a sex toy, so that she wouldn’t cross the line as siblings.

On the night when Miyu and I first shared a bed together. When I gave her a condom, Miyu seemed relieved when I answered her question about why with, “Because you look like you would enjoy sex.” That was probably because she confirmed that my desire to have sex with her was not coming from romantic feelings.

That’s how I organized Miyu’s behavior in my own way. Of course, there are some parts that are my own interpretation, but I don’t think I’m far from the truth. I was thinking like that, but Miyu sighed as if she had given up and continued.

“Well, I’m at my limit, so I can’t hide it anymore. I’m very selfish, but can I ask you a favor, Onii-chan?”

“Oh, yeah! Of course. Tell me anything.”

A cute request like that from Miyu to her big brother is exactly what I want. I answered excitedly, and Miyu, with a slight smile on her face, asked, “No returns okay?” Miyu shouldn’t use the word “anything” when talking to me.

“Then, here you go.”

Miyu patted the bed and instructed me to get on it too. Since we were both naked, I thought I was hallucinating, but no matter how many times I confirmed with my eyes, Miyu kept telling me to get closer.

Even though I was suspicious, I got on the bed and sat next to Miyu, covering my crotch with the blanket. Then, Miyu sat in front of me in seiza, hiding her breasts with the pillow. I’ll use that pillow later.

“Your little sister is tired.”

That was her first words.

“Since I initiated this, I have no intention of giving up, but I plan to take a break for a while. This is now equivalent to entrusting my life to you, so please don’t take it lightly.”

“O-oh, okay.”

I didn’t understand what she meant. At least, I understood that the recent frequent erotic incidents were due to Miyu’s carelessness.

“Specifically, what will happen from now on?”

“That depends on you, Onii-chan. During the rest period, I won’t do anything for you.”

“… What!? You’re talking about the erotic stuffs…?”

“Yeah. The erotic stuff..”

I was in despair at Miyu’s declaration. No matter what I had to do to break away from being her sister or that I was planning to have sex with Yamamoto-san, my future suddenly became dark.

I couldn’t believe that I would suddenly stop having sex with Miyu. Miyu probably didn’t think what we were doing was sex, and she had said that she would eventually stop cleaning up my semen. But, it was too much to end it so suddenly.

“Can I… just once… or, no, that’s not possible? Just for this time…!”

I threw the blanket on the floor and exposed my erect penis. At least, I wanted Miyu to accept this surge of emotion. If this was going to be the last time, I would also make up my mind.

“I don’t know what you’re misunderstanding, but…”

Miyu knelt down, threw the pillow on the floor, and faced me with her naked body.

“When I say I won’t do anything erotic with you, I mean I won’t try hard. The rest is up to you.”

“Huh? What do you mean?… Wait, wait, wait, Miyu! Wait, wait, wait!”

Miyu had pushed me down. We were both naked, and Miyu’s breasts were on full display. I was standing up my erect penis in the gap between Miyu’s belly.

My penis was pulsating with the blood vessels in my heart, enveloped by Miyu’s plump skin. Because of the height difference, we were almost in a position to have sex, and my reproductive function had already started ejaculation movements toward Miyu’s vaginal opening.

“Ooh, ooh, aahh… Miyu, this is bad…!”

I wanted to come. I wanted to insert. I wanted to impregnate her with my semen. My lewd emotions toward Miyu were overwhelming.

“You said it before, didn’t you? That you wanted to do erotic things with me. That you wanted to have sex with me.”

“I-I said that, but, c-can I…?”

Miyu, still calm, but her cheeks were flushed and relaxed, came close to my face as if she was going to kiss me and held my face with her hands.

“Of course not. What are you thinking? We’re siblings. If you impregnate me, can you take responsibility?”

“I can’t… I can’t, but… this…!”

“Then, I won’t let you ejaculate inside me. I won’t let you ejaculate. I won’t even get excited. If you get so excited by seeing your little sister’s naked body, then you don’t have enough awareness that you’re an older brother.”

“Wait! Wait! Miyu, wait… no, no, no…!”

Miyu lifted one leg and pressed my penis with her knee. Her ruthless trampling made me want to ejaculate, but that was just a rehearsal. The rapidly produced semen was waiting to be ejected from my testicles, demanding more stimulation from her.

That was rubbing my raw penis against Miyu’s vagina. I wanted to insert my erect penis, which I wasn’t sure would fit, into Miyu’s untouched vagina and reach the ultimate pleasure of coming inside her.

“Miyu, this is bad…! I really… I’ll get you pregnant…!”

“It’s your fault if I get pregnant. I can’t get pregnant unless you ejaculate inside me.”

Miyu relaxed her whole body and dived into me again. Miyu’s “not trying hard” meant that she would stop trying hard to deepen her relationship with me through erotic stuffs. I couldn’t believe that Miyu was on top of me, but her relaxed expression made her look incredibly sexy.

(I want to insert… I want to ejaculate inside her… I want to ejaculate inside Miyu…!!)

Miyu and I were connected. The male and female reproductive organs were touching each other. I wanted to have sex. I wanted to ejaculate inside her. But, if I ejaculated my semen inside Miyu’s vagina, she would get pregnant in one shot. I had that kind of conviction.

This was a replay of the incident in the bath. The only difference was that Miyu had no intention of stopping this time, so I had to stop this surge of spirit. I had to somehow calm down this desire to ejaculate inside her vagina, or it would be irreversible.

If Miyu, a student preparing for exams, got pregnant, she wouldn’t be able to go to college, and my position in the family would, of course, fall to the bottom of hell. I had to endure no matter what. If I gave in to this sexual urge, my life would end too. I couldn’t retire on the verge of the goal, just when I was about to have sex with Yamamoto-san and break away from being her sister.

(I want to ejaculate inside her! I want to have sex with Miyu! I want to rub my penis until my balls are dry and fill Miyu’s vagina with my semen…! I want to fertilize Miyu’s eggs with my sperm…)

My brain was dominated by such thoughts. I wanted to lift Miyu’s waist, have raw sex with her, and give her a vigorous piston in her vagina. That impulse was the only thing working inside me, and my body was somehow at a standstill.

However, my penis was pulsating, and I wanted to ejaculate even a little bit of semen on Miyu’s vagina. I couldn’t stop it no matter how hard I tried.

“Miyu… Miyuu… I’m sorry… I’m sorry…! Aahh, aaaahh, aaaahh, aaaahh… Miyu, I’m coming… I’m coming… Ejaculate, I’m going to ejaculate… Uhh… Uuuuhh!!”

Dobi, dobibirururu, dopp, dopp, biru, bigg, bi, bi–!!

Like spraying water from my hands with strong pressure, a lump of semen, full of sperm, was ejected from my penis, squeezing out the last drop from the bottom of my testicles.

I pushed Miyu’s body away just before ejaculating and avoided ejaculating on Miyu’s pussy, instead ejaculating on my own stomach. The extremely thick semen, which didn’t seem like it had already been ejaculated twice, spread, telling the story of my emotions toward my sister.

“You ejaculate without even rubbing. You’re really hopeless.”

Miyu was calm even during and after the act, which was probably a result of her not trying hard. But, Miyu, who was calm and collected, licked the semen off her hair, and that made her look incredibly sexy.

Even though Miyu had stopped trying hard, she was still drinking my semen, so it seemed that drinking my semen was not included in the things she had to try hard for. That was good news.

No, I’m an idiot. I still want to have sex with Miyu…

“What is it?”

I was watching Miyu licking and sucking up my semen, and it seemed that Miyu noticed my gaze.

“Yamamoto-san told me that my semen is like a real, live tadpole in her mouth, and she reflexively spit it out. Is that true?”

“I don’t have that kind of reaction. It just tastes bad.”

“Is that so? I wonder why…”

“It might be a matter of compatibility.”

Miyu licked the semen clean and raised her face, looking proud, and then she sighed.

“Hey, Miyu.”

“Yes?”

“Do you like me?”

“I like you as my Onii-chan.”

“As a man?”

“You’re just a good-for-nothing.”

Yeah, that’s true.

“Well…”

After the conversation and sex were over, Miyu got off the bed. Her whole body was exposed, her black hair, which was shiny, reached almost to her waist, and she rubbed the crease of her groin and the bulge of her stomach, which hinted at the existence of her uterus, and she looked satisfied.

“I’m satisfied, so I’ll go back to my room for now.”

“W-wait, what do you mean, ‘for now’…?”

“I plan to take a rest period until I come back from my trip with Haruka. During that time, you have to try hard, Onii-chan.”

“I will, I’ll try hard, but will there be any more erotic incidents?”

“It’s not like I particularly want to do erotic stuffs with you though….”

That’s a lie after taking such bold skinship.

“Mmm…”

Miyu looked dissatisfied, made me stand up from the bed, and then hugged me from the front. My penis, which had just shrunk, was getting hard again.

“Miyu, don’t do that again…”

“It’s not like I want to do erotic stuffs with you,, so don’t get the wrong idea.”

“Uhh… G-got it!”

What’s the difference? I don’t understand anything. If we hug naked, it’s already erotic stuff.

“I will talk to you as if we are siblings who are blood-related, acknowledging that understanding.”

“Of course.”

“You don’t think it’s okay to have sex with your sister, do you?”

“Having sex with your sister is a bad thing.”

“If you get me pregnant, can you take responsibility?”

“I can’t… I can’t.”

“Then, you shouldn’t get your sister pregnant, right?”

“That’s right. It’s a matter of course. I will never touch Miyu.”

“Absolutely? I checked with you, alright?”

I made another unnecessary promise. However, not getting your sister pregnant is common sense that all humans should have. No matter what happens, I won’t go out of control. Even if Miyu stops trying hard.

“Well then…”

Miyu hugged me tightly, naked, and looked up at me with a passionate gaze.

“If I said I wanted to have sex with you, what would you do?”

That was a completely unexpected question, and I got hard in an instant. That was my body’s answer. If Miyu wants to, I want to too. Because it was probably Miyu’s once-in-a-lifetime request, even though she couldn’t say her true feelings.

I knew it. She was hiding her true feelings with vague words. Deep down, Miyu liked me as a man. Because my relationship with Yamamoto-san was going better than expected, she couldn’t control her jealous emotions, and that’s why she came to me with such a frustrating expression of love.

“Mmm…”

While my thought process was leading to a perfect, but completely wrong answer at high speed, Miyu’s expression, which was like a girl in love, changed to a puzzled one.

“You don’t understand…”

Then, Miyu pushed me away and moved away from the close distance we were in.

This was also one of Miyu’s traps to test my understanding.

“W-wait, wait, wait! I understand! I’ll stop you even if you want to have sex with me! No matter what happens, even if I have to use force! Absolutely!!”

I reached out and connected my last hope with Miyu, who was about to go far away from the room door. I didn’t know if my feelings reached her, but Miyu turned around and returned to her neutral expression, and she looked at me one last time before going through the door.

“Well, try hard.”

Then, Miyu went to her room.

My head was confused because unexpected things kept happening, but somehow, those confusing behaviors made sense to me.

(Miyu… was that… not her true feelings…?)

Even Miyu’s true feelings, which were left vague in the end, seemed to contain some truth. Even though I couldn’t organize my thoughts, I was gradually becoming able to understand the right answer through our interactions.

I didn’t know how much time I had left before I had to break away from my dependency on her, but I felt like the pieces of Miyu’s mysterious behavior, which had been full of contradictions, were finally starting to fit together.