My Little Sister Is the Best F*p Material - Volume 4 Chapter 4: Having a Sister Makes Me Ejaculate Too Much

Volume 4 Chapter 4: Having a Sister Makes Me Ejaculate Too Much

I woke up to the morning sun tickling my eyelids, exactly one minute before Miyu’s alarm was set to go off. My body was still aching from Miyu making me ejaculate multiple times last night, but I couldn’t stay in bed—I had plans with Yamamoto-san.  

“Miyu, wake up. It’s time.”  

I turned off the alarm and tried to rouse her. She was fast asleep, clutching my shirt. She really finds comfort sleeping with me.  

“Uuu… just… one more minute… and five hours…”  

“You’re too greedy.”  

Even after peeling her off me, she quickly snuggled back in. I didn’t want this blissful moment to end, but I had to wake her or she’d be mad.  

“You’ll be late if you keep sleeping.”  

No matter how hard I tried to pull her up, she refused to let go. So, I tried a different approach: getting closer instead of pulling away.  

I pressed my cheek against hers, expecting her to push me away. Instead, she just slept more deeply. What is this adorable creature? Uh-oh, the morning situation…  

“Mmm.”  

Finally, my erect penis pressing against her seemed to annoy her, and she released her legs from around me. Being so close, my penis kept brushing against her thighs.  

Miyu rubbed her eyelids, covered her mouth, and yawned softly.  

“Good morning, Onii-chan. This is the worst wake-up call of my life.”  

“Sorry about that.”  

Sleeping with a guy, this is inevitable. Last night’s antics were my fault, but morning wood is unavoidable.  

“I need to make breakfast.”  

“Oh… right. I completely forgot about breakfast.”  

“You don’t have to make it, you know?”  

“No, that’s not it…”  

I’d used up all the ingredients, thinking she’d be gone by morning. I planned to eat out before heading to Yamamoto-san’s. With my part-time job tomorrow, I should’ve bought some bread at least.  

“Nothing to eat?”  

“Sorry…”  

“Then I’ll just have you instead.”  

“…Huh? Miyu… today… wait, uh…!”  

Miyu turned her back to me, still under the covers, and slipped off my pants. Her small hand gripped my erection. She knew I was meeting Yamamoto-san later, yet she mercilessly stroked me.  

Miyu was stimulating me, craving my semen. She was arousing me, intending to drink every drop. How could I resist?  

“Miyu… agh… ahh… stop… I can’t… haaah… ahh…!”  

My mind knew I shouldn’t ejaculate again, but my body wouldn’t listen. Hidden from my view, Miyu’s hand worked its magic, pushing me toward the edge.  

Miyu straddled my chest, her head buried in the covers, focusing on my penis. Her thighs peeked out from her shorts, and if I pulled the hem, I’d see her V-line. It fueled my desire even more.  

“Miyu, you’re too erotic… ah, haa… uuu…!”  

Her intimate area was right there. If I reached out, I’d touch her folds. Miyu’s body was always wet, and her tight entrance might easily accept my fingers.  

What would her untouched insides feel like? How much unity would we share if I thrust my throbbing penis into her tiny hole? Sex with my sister… yet I—  

“Ah, uah… Miyu, so fast… I can’t…!”  

Miyu quickened her strokes. It was a command to ejaculate, and I had no choice but to obey.  

“Haa, aah… Miyu… Miyu…!”  

Her hand tightened around my shaft, my brain boiling with desire. I wanted to feel her more, touch her more. Almost unconsciously, I gripped her thighs.  

“Miyu…!”

My desire swelled as I caressed Miyu’s smooth, glowing thighs, and just before ejaculating, I ran my palm along her inner thigh.  

“Nhyaaaah…! Ah, aah, Onii-chan…! There, no, stop…!”  

Miyu’s sultry voice came from under the covers. Ignoring her pleas, I let my desire take over, exploring further.  

“Onii-chan, stop… I said stop!”  

“Miyu! I can’t hold back… I’m cumming, ahh… drink it, Miyu…!”  

“Hyaah, in this situation… mmm, ah… you’re… idiot… nku… goku…!”  

Miyu tried to resist my touch but had to keep her mouth in position as I ejaculated. With each thrust of my hips, her body twitched, and she swallowed every drop.  

“Haa… agh… ugh… cough, cough…”  

Once I finished, Miyu tossed the covers aside and turned to face me.  

“Onii-chan…”  

Her gaze was filled with resentment, but it lacked her usual intensity.  

“You shouldn’t touch there.”  

Miyu rubbed her thighs, trying to erase the sensation of my touch.  

“Sorry. You were just so irresistible.”  

Being hand-stimulated in that position, I couldn’t help myself.  

“Listen, Onii-chan. I’ve been quiet about this, but you need to remember: my neck, thighs, and chest—especially the tips. Don’t touch them.”  

Miyu pointed to her neck, and I nodded.  

“Those are off-limits. If you touch them without permission, I won’t just punish you—I’ll slap you.”  

“I won’t touch them! I’ll try my best!”  

“Good. Don’t let your efforts go to waste.”  

“I’ll try…”  

Miyu got off me and returned to her room.  

A few minutes later, she reappeared at my door.  

“From now on, I’ll say ‘don’t’ explicitly. But since you’ve made extra laundry for me, don’t use anything after I leave.”  

“Uh… okay.”  

Sorry, Miyu. I know you’re sensitive, and I made your underwear a mess. I’ll buy you new ones.  

“They cost about 8,000 yen for a set.”  

“What?!”  

Miyu explained that while the panties are fine, her bra size is hard to find. She prefers matching sets. Please forgive my ignorance.  

“…Huh? Wait. Miyu forgot her pillow.”  

After Miyu closed the door, I noticed her pillow still on the bed.  

“It smells so good…”  

Even without burying my nose in it, the scent of her post-shower shampoo filled the air. We use the same shampoo, but hers smells stronger. Is it because she’s a girl? What should I do? Just a little…  

No, stay calm. A little won’t be enough. Once I start, I won’t stop until I ejaculate again. The pillow holds days’ worth of her scent. I can’t resist that.  

“Haa… haa… damn… this is…!”  

I was already erect before even smelling it. I buried my face in Miyu’s pillow.  

“Suu… haaah… aah… Miyu… no… this is too much…”  

It smelled like Miyu—her sweat and her favorite shampoo. My throbbing erection was painful. Every muscle in my lower body ached, and my shaft felt like it was cracking. I can’t ejaculate anymore. I’m supposed to have sex with Yamamoto-san today. I can’t tell her, “I ejaculated so much I can’t get it up.”  

I’m an idiot. I’m already at my limit. And Yamamoto-san… there’s no way one session will satisfy her. I’ll need to ejaculate at least two, maybe three times.  

Yamamoto-san wants her partner not to ejaculate, but with her body, it’s impossible. Her libido and stamina are endless. If I don’t ejaculate, she might reverse-rape me for hours. The pleasure would kill me.  

I need to finish. If Yamamoto-san goes wild, I’ll have to stop her physically.  

But it’s impossible. I have no semen left. Miyu took it all. She was intentional this morning and last night, angry that I’m trying to distance myself from her and jealous of my time with Yamamoto-san.  

Damn it. How can I explain this to Yamamoto-san?  

“Haa… aah… suuu… haaah… Miyu… your scent is amazing… aah…”  

Miyu’s scent was intoxicating. My testicles ached, and I felt like I might need to see a doctor soon.  

“Miyu… Miyu…!”  

Her scent made my semen boil. My body was producing more, adapting to the situation. It felt like my body was desperate to impregnate her.  

If I pushed further, I could recharge. It was a rational decision—Miyu’s fault for making me ejaculate so much. This wasn’t me losing to my desires.  

“Haaah! Miyu… kuhaa… suuu… haa… suuu… uuu… Miyu…!”  

Her scent filled my mouth, and happiness overwhelmed me. I felt weightless, like I was floating in warm water. My consciousness was melting, blending with the world…  

“Ah… ah… Miyu…”  

*Slam.*  

The sound of the door closing startled me. I heard movement from Miyu’s room—she’d finished in the bathroom and returned.  

That was close. If I’d continued, I might have lost myself completely. I needed to return the pillow. My lower body was still throbbing, but if I left it, I’d be tempted again.  

I went to Miyu’s door and knocked.  

“Miyu, I forgot to return your pillow.”  

“Come in, my hands are busy.”  

I wasn’t planning to enter. If she saw my erection, she’d be disgusted. I wanted to hand it over at the door.  

“Your hands are busy? Doing what—”  

I cracked the door open slightly, and in that moment, I fell for her all over again.  

Miyu was styling her hair, wearing a Lolita-style dress with a uniform-inspired collar. Her ample chest contrasted sharply with her slender waist.  

“If I let go, I’ll lose my place. Just toss the pillow on the bed.”  

Her red lips spoke, her eyes glancing at me, her long lashes fluttering.  

“Ooh… oah…”  

My sister… she’s so cute.  

“What’s wrong?”  

Miyu looked confused at my frozen state.  

“Uh, nothing. You just look so grown-up…”  

“Grown-up? Hmm… maybe it’s the makeup…?”  

To her, this wasn’t grown-up attire, just Lolita fashion. I’m not familiar with typical girls’ outfits yet.  

“It’s rare to see you in this style.”  

“Haruka’s wearing something sweet, so I figured I’d match her a bit.”  

The two of them, dressed so adorably, going out together. I wish they’d take a photo—I’d frame it.  

“So, how long are you going to stand there?”  

I didn’t want to enter, but my erection was taking too long to subside. Time to end this.  

I quickly opened the door, threw the pillow on the bed, and closed the door behind me, hiding my erection. Miyu said nothing.  

Mission accomplished. I’d stay in my room until Miyu left. In a few minutes, she’d be gone for a week.  

“Haa…”  

I returned to my room, slumping on the bed.  

“Ah… Miyu’s scent… it’s still here…”  

The sheets held a faint sweetness, not as strong as the pillow. Soon, even this would fade. No more of her sullen face, no more of her voice. And if I distanced myself from her because of Yamamoto-san, we’d never share moments like this morning again.

Emptiness. Despair threatens to consume me. If I don’t fill this void in my chest, I might never stand tall again—both physically and metaphorically.  

“So… it can’t be helped, right…?”  

I tried to justify my actions, my penis hardening as I pressed my cheek against Miyu’s side of the bed. I rubbed my face against it, my erection twitching with desire.  

How long had I been like that? When I opened my eyes, I caught Miyu peeking into my room through the slightly open door.  

“Ah… no… this isn’t…”  

Miyu didn’t scold or accuse me. She simply closed the door as if nothing had happened.  

“Ooooh! Wait! Wait, wait, wait! It’s not what you think! Miyu!”  

I chased after her, nearly tripping down the stairs, and caught up at the entrance.  

“Miyu, listen. Just now—”  

Miyu slipped on her shoes, slung her tote bag over her arm, and turned, her loose, wavy hair swaying gracefully. She looked so delicate.  

“Onii-chan… take care…”  

With those words, she left.  

I can’t believe it ended like this. Will she think of me as a pathetic pervert for the rest of her trip?  

“Haa… I should get ready too…”  

I headed to the changing room with a change of clothes. Yamamoto-san’s apartment is a quick bike ride away, but it’s hot out, so I’ll need deodorant. I don’t want her to think I’m sweaty the moment I walk in.  

I set my pajamas aside and took off my shirt. I’d just changed my underwear last night after ejaculating inside them, but I figured I’d shower again. The scent of semen from this morning might still linger. Even if no semen touches them, the groin area smells like it after ejaculating and sweating.  

Wanting to smell as good as Miyu for Yamamoto-san, I stripped and tossed my clothes into the washing machine. Then, I noticed Miyu’s three sets of underwear: one from yesterday afternoon, one from last night’s activities, and one from this morning when I touched her thighs. I’d really put her through a lot.  

The top one was from this morning. It might still hold her warmth, or maybe the crotch was still damp. I picked up her panties, but my left hand grabbed my right, stopping me.  

Wait, don’t do it. She told you not to touch them. Using your sister’s underwear without permission is unforgivable. My right hand held her damp panties, and my groin was rock-hard. It would feel amazing to use them.  

But I won’t. I’ll put them in the laundry net and wash them. At least, I won’t do it while she’s gone. Even if her absence makes me desperate.  

“Hmm?”  

Was my desperation making me imagine things? I felt a gaze and turned to the changing room door.  

There stood Miyu, just as she’d left, staring at me without meeting my eyes.  

This can’t be real. Am I hallucinating? She wore the same Lolita dress, so innocent and cute. And in her eyes was the image of her naked brother, holding her panties and fully erect.  

“I see…”  

Miyu murmured cryptically and closed the door.  

“W-wait…”  

This wasn’t a hallucination. It was a full-blown disaster.  

“Wait!! Miyu!!”  

I quickly put on the clothes I’d brought for going out and rushed to the living room.  

Miyu sat gracefully on the sofa.  

“Miyu, it’s a misunderstanding. I wasn’t going to use your underwear. Yes, I was naked, and I’m still erect. I’ve done plenty of questionable things, but this time, I was just going to wash them.”  

It sounded like a lame excuse, but I had to make her believe me or our relationship would suffer.  

“Onii-chan…”  

Miyu patted the spot next to her on the sofa, gesturing for me to sit.  

I’d said my piece. Now, I could only hope she’d believe me.  

“I’m worried about you, Onii-chan.”  

That’s understandable.  

“Are you that lonely without me?”  

“I am lonely, but holding the underwear was just a coincidence.”  

For a split second, I’d had impure thoughts, but I had no intention of using her panties.  

“What about this?”  

Miyu pointed to the bulge in my pants.  

“That… well, the pillow and sheets smelled so sweet, and… that happened.”  

I couldn’t deny sniffing her scent on the bedding.  

“Maybe it’s the leave-in treatment I used. Sorry if the scent transferred.”  

“It’s fine. Actually, it’s more than fine.”  

I struggled to find the right words. I didn’t need her to apologize. I’d prefer if she marked her scent everywhere.  

“Why are you still here, anyway?”  

Since Miyu didn’t seem angry, I changed the subject.  

“Haruka suddenly said she’d pick me up by car. I have about thirty minutes to spare.”  

I see. I’m glad Miyu’s staying longer, but I could do without these accidents.  

“When are you leaving?”  

“I’m meeting Yamamoto-san at eleven.”  

It was almost eight. Normally, I’d sleep for another two hours, but thinking about last night with Miyu made me too restless to stay in bed.  

“Are you… not mad?”  

“I’m not mad. I’m not saying I’m not upset, though.”  

“I see.”  

She wasn’t angry. She didn’t seem upset either. Usually, she’d be furious and punish me.

“Of course, using my underwear without permission is still wrong. But since I peeked into your room, it’s my fault too. I should apologize for invading your privacy.”  

“You don’t have to be so polite. You could be angrier, you know?”  

Anyone would worry after seeing such suspicious behavior. Even if it were a trap to monitor me, I’d still reflect on my actions.  

“Really? Then no need for an apology?”  

“Huh? Apology? You mean, the, uh, *that* kind…?”  

“If that’s what you want. Do you still want it?”  

This erection is meant for Yamamoto-san. If Miyu makes me ejaculate now, it’d defeat the purpose. But I won’t get another chance for a while…  

“Would you be upset if I asked?”  

“I’d be upset, but I’d still do it.”  

Right, of course.  

“P-please…”  

“Sure.”  

Miyu agreed and went to the bathroom, returning in less than a minute.  

“Don’t you need to use the bathroom?”  

“I just put in a napkin.”  

“Oh… okay.”  

Miyu knelt in front of me on the sofa, unzipped my pants, and pulled them down along with my underwear. My erection sprang free, and she stared at it expressionlessly. When will I get used to this embarrassment?  

“Come up with your own excuse for Yamamoto-san.”  

Miyu wrapped both hands around my penis and began stroking it.  

“Ohh, aah… so warm… haa…”  

It felt amazing. Her hands were small, and watching her grip my penis, which had grown two sizes larger since summer, was adorable.  

“Ugh… aah, this is too good…”  

Unlike her usual school uniform or casual wear, she was dressed up cute, her hair styled perfectly. Her fingers, moisturized daily with hand cream, were smooth and beautiful. Her nails were polished to a glossy finish, carefully filed, with one exception: her right ring finger, coated in pink and decorated.  

“Nnn, ugh… haa, Miyu… so good… agh… nnn, nnn…!”  

Despite my recent ejaculations, my penis was eager, thrilled to be stroked by my sister. Even punishment handjobs felt different when they were acts of service.  

Overwhelmed with pleasure, I arched my back and lowered my gaze, only to see Miyu staring intently at my penis between my bare legs.  

“M-Miyu, what’s wrong…?”  

I asked, and she sighed softly.  

“I’ve finally become the one handling my brother’s desires…”  

She continued stroking me, her words heavy.  

“I thought you’ve been doing that for a while now…”  

I knew we shouldn’t get used to this, but we’d been doing it for months. It felt like an old conversation.  

“From your perspective, maybe. But I was just disposing of your semen, not handling your desires.”  

She spoke calmly, her hand moving steadily.  

Disposing of semen versus handling desires…  

“What’s the difference?”  

I asked, and she glared, tightening her grip. Her rough stroke squeezed my penis.  

“Do you think this is the same?”  

“Ah, aah, guh, no, completely different! This is way better…!”  

She was right. Before, she’d only cleaned up after I ejaculated. I’d used her as my outlet, but she’d only been involved at the end. Even when she punished me, I’d just gotten aroused and ejaculated on my own.  

“You’re so hard. Are you that lonely?”  

With my recent excessive ejaculations and now this, just before meeting Yamamoto-san, it was clear I was lonely.  

It’s just a week, but after months of growing close to Miyu, her sudden absence felt different.

Sleeping and waking up to her presence, leaving the room and seeing her as if it were the most natural thing—that was our relationship. You only realize how precious something is once it’s gone.  

“Miyu, um, one request…”  

I was close to ejaculating. Before finishing, there was one thing I wanted her to do.  

Miyu slowed her strokes, waiting for me to continue.  

“If you don’t mind, could you… suck the tip like yesterday?”  

It wasn’t exactly a blowjob—more like mouth support. Still, Miyu distinguished between merely placing her mouth over the tip and actually taking my penis into her mouth. Since she’d already defined it that way, she had no reason to refuse.  

“Muu…”  

Miyu’s displeased expression didn’t bode well.  

Instead of answering, she stroked me harder.  

“Ah, wait, I take it back! Forget it! Please, just don’t make me cum roughly…!”  

This was the last time she’d make me ejaculate. I didn’t want it to end like this.  

“Haa, fine. You always get carried away.”  

Just as I thought I’d ejaculate, she stopped.  

“If you thrust your hips, I’ll bite it off for real.”  

Miyu adjusted her position, looking down at the tip of my penis. Her words and actions made me realize what she was about to do. She loosened her grip, guided my penis to her lips, and leaned in.  

“Aaaah! Haa, uu, uuaah!”  

Miyu sucked just the tip while stroking the shaft. The sensitive head, dried by the air conditioning, was enveloped in warm moisture. She kissed the tip, sucked the pre-cum, and her tongue peeked out, tracing the slit.  

The visual and tactile stimulation was overwhelming, and I felt dizzy with pleasure. In that moment, I recalled the first time Miyu had watched me ejaculate. Back then, all I could do was ejaculate, and she’d caught it in her mouth. Now, she was gently stroking and licking me.  

Her expressions—angry, neutral, slightly embarrassed—flashed through my mind, each one filled with love.  

“Aah, Miyu, I’m close… agh, guhaaah, I’m cumming, cumming!!”  

As my penis reached its peak, Miyu looked up at me, her eyes locked on mine. I felt her tighten her grip, and at that moment, she sucked the tip, creating a “chubu” sound.  

“Ah, I’m cumming… uuu, aaaaahh!!”  

“Dopu, byuru, byururu, byubu, dopun, pyu, byuru—!!”  

Despite ejaculating just that morning, an incredible amount of semen shot out, all swallowed by Miyu’s suction. The intense pleasure left my ears ringing, and I watched as she kissed my penis, catching every drop.  

It felt like my testicles had been split open. The sensation told me this was the thickest ejaculation yet. Miyu sucked every drop from my urethra, wiped the last bit of pre-cum with her finger, muttered something, and stood up.  

She went to the bathroom. When she returned, I was still in a daze.  

“Onii-chan, I’m leaving now.”  

The engine roared outside. Haruka had come to pick her up.  

I wanted to see her off energetically, but my body wouldn’t move.  

“Are you listening? Take a shower before meeting Yamamoto-san, or she’ll know.”  

Miyu advised me before leaving. I nodded in response.  

“I’m going now. Be nice to Yamamoto-san.”  

I watched her leave with half-closed eyes, seeing her off in spirit until the car’s sound faded.  

The house fell silent, leaving me alone.  

I sank into a deep sleep, as if drawn into the darkness.