My Little Sister Is the Best F*p Material

Volume 9 Chapter 07: Technobreak

Miyu’s genes or biology limit her love to those closest to her, like me, her brother. When she first revealed this after we fell for each other, I pitied her, thinking she was unfortunate. She rejected confessions from outstanding guys, only able to desire a dull otaku like me.

But watching her eagerly suck my cock makes me rethink that.

“Hamu… jurubu… gudju… chupu…”

“Ugh, haa, Miyu… I’ve already cum twice… ah, ugh…”

Standing in my room, pants pulled down, Miyu kneels, blowing me. Her small mouth engulfs my thickened cock, lips reaching the base, using her throat. Her pajama-clad breasts jiggle with each head movement.

“You said sex in your uniform is special, so my schedule got messed up,” she grumbled during a breather.

Her creed is to finish blowjobs with just her mouth, no hands, even with my now-larger cock. It’s to please me more. After a quick suck at the entrance, we moved to the bath, where she switched to a foamy paizuri. She didn’t care about making it special, but I want uniform sex after reluctant negotiation, not easily won like a vending machine purchase.

I know it’s a tricky fetish, but it’s one she instilled in me.

“Ugh… Miyu…! I’m cumming… aah…!”

Doku doku, my cock pulses, cum shooting through my urethra. Such fleeting pleasure from sensitive friction—why is it so addictive? Miyu reads my desire, making me cum, swallowing my load with satisfaction.

“Thanks for the meal. I’ll finish up next door.”

She left for her room to masturbate, aroused from my cum. It should be my job, but she knows post-climax, it’s torture for me.

Her reproductive instincts crave my semen. Creampies should be her favorite, but blowjobs, nurtured through our love, seem to top even sex for her. She finds more satisfaction in my ejaculation than her own orgasms. For her, my cum volume and frequency matter more than foreplay or technique.

I have my own quirk: using Miyu as my fantasy makes my lust and semen boundless. Her choosing me—or having no choice—was the most human partner selection. Like others sense genetic compatibility through scent, she instinctively knew I, her brother, was her best match, rejecting all other men from birth.

She must be happiest now, and I should devote myself to her joy. I once dreamed of an ero-manga life of endless lovey-dovey sex. This should be pure bliss, yet…

The next morning, after she returned from masturbating and we slept together, she was sucking me off as I woke.

“Morning, Onii-chan. Nn… chu… jurupu…”

“Ugh, ah… morning… like this… uah, aah…”

“Your cock was already hard.”

A night’s rest refills my semen somewhat, though energy and libido depend on stamina. Still, I can cum.

“Nn… ju… haa… But daily blowjobs might tire my jaw.”

If my cock were smaller, a blowjob-only phase might’ve worked. But its size strains her small mouth and tight holes, making repetitive play tough.

“Inside okay?”

“Fine by me, but you? School’s today.”

“I’ll shower in the morning. We sweat a lot at night anyway.”

Straddling me, she winced at her tight vagina stretching around my thick cock, slowly lowering herself.

“Your hole never loosens… fuh, ugh… so tight even after all this…”

“Nn, nnh… haa, nn… your cock fills me up, it’s tough…”

Her tight hole grips me, but her hip movements improve, showing she’s molded to our sex. Moving slowly, she strokes from base to tip, the thick base making a michi sound as it forces her flesh apart.

“Nn… haa, feels good… so happy being connected… nnh, nn, fuu… aah…”

She speeds up, my cock readying to cum. Unlike Yamamoto-san’s skillful vagina, Miyu’s tight passage mimics a handjob’s pressure, effortlessly driving me to climax with mindless thrusts.

“Aah, gu, haa… Miyu… I’m cumming…!”

“Onii-chan… me too… nnh…!”

Dopu dopu, cum bursts inside her, and she climaxes with me. Collapsing on my chest, breathing heavily, her sweaty forehead and hair-tucking gesture ooze post-sex eros.

My cum in her womb forces her to orgasm. Humans don’t ovulate from climax like animals, but with her instincts, it’s no surprise she retains such primal traits.

“Phew. Hehe, morning cum’s so thick.”

“You can tell?”

“First versus third shot? I feel the difference rubbing against your cock.”

“Impressive.”

A sister born to conceive with my sperm—too erotic.

“I’ll shower.”

Careful not to leak, she stood, holding her labia shut, and left with small steps, keeping my cum inside. Her body’s built for creampies, unlike Yamamoto-san’s versatility.

School, home, sex with Miyu—my life’s transformed from six months ago by our sexual bond.

Today, Miyu got home first, greeting me in a miniskirt and apron—insanely erotic. The apron’s waist tie accentuates her huge breasts.

“Welcome back, Onii-chan.”

“Hey, Miyu. Nn.”

First, a kiss before handwashing, a deep tongue kiss, then up the entrance, mood heightened. To fulfill her planned sex, she’d ditched her panties for easy licking. Kissing her up close, she undid my pants, stroking my cock. Showing her pussy embarrassed her, so she wanted mine exposed too.

Aroused, she lifted her apron. The ultra-short skirt barely functioned, flashing her slit. Obscenely tantalizing.

“Go ahead, Onii-chan.”

But seeing her smiling, holding the apron, I realized something. Her lewd act—my serious sister in such an erotic outfit—explodes my lust. Yet, part of me craves her pre-fever, cold, dismissive gaze.

I wanted her to beg for sex, but now that she does, my body irresponsibly longs for her distant look.

“Ugh… Miyu…”

Still, my tongue dove into her juice-soaked slit, my erection sharpening. But my mind wandered elsewhere.

For example, if someone’s going to come on this strong, I’d want it to be Yamamoto-san. Her overflowing devotion, that lascivious smile exposing her lewdness, her seductive hip sway inviting me, guiding my tongue to her parted labia with her fingers. If she patted my pathetic head, praising my efforts with her overly indulgent standards, that alone would fill my heart.

I kissed Miyu’s labia, sucking and licking repeatedly, driving her trembling body further by thrusting my pointed tongue deep into her vagina. Despite this privileged position, my mind flashed back to Miyu’s maid-service days. The heavy way she lifted her iron-like skirt, the tense glare that seemed to hold hatred, and those eyes looking down on me like trash—they turned the cotton stuffed in my cock into something as hard as stone.

Miyu, once so averse to showing her pussy, was now hooked on the pleasure of having her clit and folds licked, holding my head to keep my mouth in place. I wouldn’t stop licking anyway, but I wanted her to push back against my forehead, scorning my vile act. If she did, I’d desperately stretch my tongue to keep licking, no matter how pathetic I looked. If she threw a gut-deep “Disgusting…!” at me, teary-eyed as she came, I could ejaculate ten times a day.

“Haa… ah, shit… I’m cumming! Sorry, Miyu… it’s coming…!”

My fantasies pushed my urge to cum past the limit. Gripping my cock’s base, I stood, fighting the surge from my balls, but the ejaculation switch was flipped, unstoppable.

“Fua, eh!?”

“Sorry, Miyu…!”

I lifted Miyu’s leg against the wall, thrusting my cock into her vagina from the front. The sudden, awkward position meant only shallow penetration, but I managed to pour my cum into her as a receptacle, avoiding the floor. Her slit stretched around my cock, just the tip inside, leaving her stunned.

“Ah, eh…? You’re cumming, right…?”

“Yeah, sorry. Couldn’t hold back.”

“Geez…”

Miyu, leaning against the bathroom door with just my cock’s tip inside, pouted. My cumming from licking her had become routine lately, and this resignation seemed to summon the old Miyu. Used solely to catch my cum, she shot me a slightly scary glare.

“Using your sister’s vagina as a tissue substitute is kinda messed up.”

Her icicle-sharp voice made me leak another spurt inside her. Feeling it, she kept her cool expression but looked away, hiding a smirk with her hand, her cheeks flushed with shy delight at being used for cum disposal.

In the end, I was having sex with my sister while fantasizing about her. This philosophical fetish was a problem I had to face to keep cumming.

As I tried to pull out, she stopped me—shallow ejaculation meant most of the cum would drip onto the floor, her tight slit unable to hold it. With no nearby substitute, I lifted her body, having her cling to my upper body.

“Wah, ah, nn… this is… a bit…!”

Honestly, I thought it was impossible. But my core, trained by endless sex with Miyu and Yamamoto-san, could lift a fifty-kilo girl.

“Nah, ah… wait, this… fua, ah… it’s going too deep…!”

Held up, Miyu’s weight drove my still-inserted cock deeper into her vagina. Her slight resistance only fueled my lust. I rocked her body up and down, her legs clinging to my waist, stimulating her womb’s depths.

Using the momentum to move forward, I walked to the bathroom, pistoning as her weight swung like a pendulum. By the time we reached the bath, my lower body was soaked with her juices and my cum. This act to avoid dirtying the floor had no meaning beyond sexual pleasure, but her羞恥ful look and this fresh style kept my erection rock-hard, demanding another ejaculation.

“This… nn, aah… ah, ah… like an AV… no…! So embarrassing… stop… nnh, aauaa…!”

“Miyu… feels so good…! I’m so horny, let me cum till I’m calm…!”

“Hia, ah, nn… how many times… no, stop… I’m cumming… cummingcummingcuu… higyuu—!!”

Miyu came from the forceful sex, yet I kept lifting her. I’d heard holding a girl during penetration could break a cock, but I couldn’t stop this lust.

“Miyu, Miyu…! I’m cumming again… inside your vagina…!”

Timing my final lift and thrust, I rammed into her womb, ejaculating. She let out a guttural sound, nearly fainting, squirting like she was pissing, legs trembling as I set her down, cum and juices dripping from her slit.

She looked cuter than ever. My lust was out of control. After three ejaculations, my cock stayed hard.

“Miyu, put your hands on the wall and stick out your ass.”

“No… too much… my womb’ll break…!”

“It’s fine. I need to fuck you so bad. Please.”

Barely masking my force with a plea, I turned her around, kneeling her for doggy-style penetration.

Without letting her catch her breath, I grabbed her hips, arching her back, and thrust my cock to the hilt. The pan pan of my pelvis hitting her ass echoed in the bathroom, her voice so loud the neighbors might’ve heard if it were later. Screaming near-sobs, she kept cumming from my relentless thrusts.

A mirror faced her. She shook her head to avoid seeing herself. Her apron-tied breast bags swayed with my thrusts. The short skirt was useless in this position, exposing her round ass and stretched vagina.

Her obscene form excited me, and she, caught by glimpses of herself, couldn’t break the pose. Despite her exhaustion, she stayed because she loved being fucked by her brother from behind.

“Miyu… cumming again… gonna shoot…!”

Leaning over her, I thrust like a beast, and she screamed, taking my creampie without replying. As I stopped, she collapsed, fluids pouring onto the bathroom floor from her slightly raised slit.

“Haa, haa… Miyu…”

Calling her, she shakily faced me, eyes teary. My cock still stood, veins bulging.

I didn’t know why I was so aroused. I wanted our sweet, lovey life, but I needed her scorn or to exhaust her to truly get off. This twisted fetish was the issue.

Despite three consecutive ejaculations, my cock stayed hard. Knowing more would hurt her, my brotherly instincts kicked in. To handle the remaining lust, I’d use her breasts.

Hearing my request, she adjusted to a three-point stance, lifted her T-shirt with the apron, and sandwiched my cock in her cleavage. The cum’s stickiness let it slide in easily.

Her bra-squeezed breasts gripped my cock tightly. The apron’s scant fabric highlighted her navel and thighs, amplifying my lust with its visual effect.

Hitting her underboobs instead of her ass, I thrust hard, seeking ejaculation. She braced with her abs to avoid falling, her waist tightening erotically with each hit. Her twitching, exhausted thighs and arms squeezing her breasts to speed my climax, showing fat ripples, drove me wild. Just her muscle movements during sex turned me on.

“Ugh… uuh… Miyu…!!”

Every part of Miyu excites me—her throat swallowing hard as I’m about to cum, her eyes locked on my cock, the strands of hair swaying with each thrust. The fact that she accepts being used like a toy for my ejaculation drives my cock to its maximum hardness.

“Cumming… ughhh… cumming…!!”

It felt less like ejaculating and more like being wrung out. Like injecting whipped cream, my cum spurted into her cleavage, spilling over her breasts’ curves, staining her apron.

“Geez, Onii-chan… dirtying your sister’s body like this…”

When she spread her elbows, cum dripped from her T-shirt, pooling in the grooves of her thighs. Seeing this, she stripped off her top, tossed it to the laundry area, and scooped up the cum, drinking it. She licked every drop from her fingers, her glossy fingertips erotic as she ensured not a single sperm escaped.

A subtle silence followed. We spent the time until the bathtub filled quietly, then bathed together. Washing in turn, we sat in our usual front-back position, Miyu crouching, staring at the water.

“Something wrong?”

“Nn… no… just…”

Her cheeks stayed flushed, not from the water’s heat. After sex, she seemed distant, awkward.

“That was intense, Onii-chan…”

She mumbled, looking down. Her lovey-dovey state lingered, and the sex clearly felt good, but unlike usual, when she’d let me touch her breasts or show her pussy in the bath, she kept her knees tight, hiding herself.

“Miyu?”

Even when I called, she seemed half-absent. The reason became clear before bed. Changed into pajamas, we got ready to sleep early, exhausted from my insane ejaculation volume.

“Onii-chan, would you be mad if I asked for a kiss before bed?”

In bed, pressed close, her face reddened as she asked. As if I’d ever be mad at her for wanting a kiss. Wondering why she’d ask, I kissed her as requested.

Before bed, we shared light lip kisses, repeated a few times. She giggled, her mouth softening, but it wasn’t enough.

“I want a tongue kiss…”

She stuck out her tongue, begging for more. It felt like loverly affection, and her cute, pleading face was irresistible, so I indulged her with a deep kiss. Starting with tentative licks, it turned into sucking each other’s tongues, lips trembling, breaths mixed with moans, lasting minutes.

That wasn’t the cause, though. I should’ve noticed sooner. Only when she spoke did I realize my oversight.

“Just once before bed… can we do it?”

Placing her hands on my chest, she pressed closer, looking up at me.

“Wha… eh!?”

She was asking for sex—after four massive ejaculations that night. She should be drained, yet her womb ached for more, craving sex. The mirror, showing her being fucked, had stoked her lust far more than I’d imagined.

“Miyu, here’s the thing. Lately, even without sex, my pulse is kinda high…”

“I know. Just once.”

Her eyes begged for sex, everything else secondary.

“But if we do it now, we’ll crash right after. We’ve been creampie-sleeping for days, and you said you hate the smell, so only before baths, right?”

“Then let’s use a condom.”

Her lust wouldn’t relent without sex. So, we’d do it. My body, my male reproductive function, exists for her. If she wants sex, no matter the situation, I have to comply.

Grabbing the condom box after a month, she got me hard with a blowjob, but the condom felt insanely tight. It wasn’t near expiration—maybe it no longer fit.

“Condoms make it feel like we’re about to have sex, so exciting. I’ll move, so you rest, Onii-chan.”

Showing kindness, she lowered herself, starting sex. I just needed to stay hard. After that many ejaculations, most would find it impossible, but my quirk made it doable. And rubbing her vagina inevitably felt good.

“Ugh… fuh, ugh, gu…!”

Her vagina enveloped me, pulling and stroking, my body reacting despite the exhaustion. My slight trembles fueled her arousal.

“You’re so cute when you feel it, Onii-chan. Cum when you want.”

Her strokes were large but not intense—her strength was spent, but for her, sex was about connecting my cock to her womb. Extra stimulation dulled her sensitivity.

“Ugh, uuh… Miyu…!!”

Ridden by her, I came, collapsing on the bed, too drained to clean up, and passed out.

The next day, I was paralyzed, like sleep paralysis.

My body wouldn’t move. Muscle fatigue was part, but my willpower was gone. Miyu had drained my energy, leaving me a zombie staring at the ceiling, like a vampire’s victim.

“Morning, Onii-chan.”

Miyu peered at me, greeting. She was radiant—her hair 30% shinier, skin glowing like she’d already washed.

“Hehe, we did a lot yesterday.”

Rubbing her cheek against my arm, she was all lovey-dovey. My memories were just sex with her. The calendar was irrelevant—five-plus daily ejaculations were unexpected.

“Condoms are nice, huh? Easy to see how much you came.”

Looking at the headboard, she grabbed a used condom—two, knotted with cum.

“Huh…? Why’s there another…?”

“You don’t remember? We did it again after. Said we’d use up the condoms.”

Apparently, I’d been milked again, twice because we had two left. If there’d been three, what then? No wonder I couldn’t move.

“Then I’ll take the morning’s fresh batch.”

“Eh… wait, Miyu…! Stop… ah, aah…!”

Per her calendar, she started a morning blowjob. Unable to resist, my recovered semen was taken by my cum-loving sister.

“Ah… ah, ah, ah…”

It felt like my life force was sucked through my veins, pooling in my pelvis. My eroge-obsessed brain made it feel like I was shaving off my lifespan.

“Nn… jurururu… chu, juru…”

“Aaaah, aaauaaa…!!”

Unable to resist her craving, I came in her mouth, feeling my life drain.

I couldn’t move. I’d skip school. Daytime sleep might restore some energy.

“Onii-chan, not getting up?”

“Not can’t get up, Miyu. I can’t. Get ready, don’t mind me. I’m skipping school.”

“Really?”

Her eyes lit up, climbing onto my stomach.

“Then I’ll skip too.”

“I’m up!! I’m up!! I can move!!”

Reflexively, I sat up. I could walk, but my brain lagged a second behind commands. I changed into my uniform, tying my tie, lest I lose the will to go. Miyu, still in pajamas, was all lovey-dovey. Cute sister.

“You love me too much, Miyu.”

“I love my Onii-chan.”

“Being loved by my cute sister makes me happy. I’d give my life for you.”

“Hehe. I don’t wanna be apart for a second, but as your sister, I’ll bear separate time.”

Seeing me ready, she smiled and left my room.

This became routine. We’d get horny on sight, kissing for tens of minutes, never dropping below three daily ejaculations. More lovey-dovey than any couple, yet my body was losing something.

I’d pass out unconsciously, go to school, zone out through classes. During lunch, I sat, pen between fingers, head swaying, vision 20% darkened. When that darkness shut me out, my life’s flame would burn out—technobreak.

“Sotomichi-kun, you okay?”

Yamamoto-san’s voice, first in a while, sounded worried. Everyone knew we were close, so no need to pretend, but she’d been busy, leaving right after school.

“Your eye bags are wild. Like crayon makeup.”

“Yeah… maybe not okay…”

At home, Miyu’s cuteness led to sex, even me initiating in this state. We needed to discuss cooling down. The celebratory parent-approved sex phase should end.

“It’s fine if you’re zoned out, but it’s the deadline. Answer already.”

Kawafuji Nanako’s sharp voice, unlike Yamamoto-san’s warmth, pierced my tired brain. She rarely approached my desk.

“Deadline… for what?”

“Are you mocking me? I reminded you in group chat. School trip free time—where to visit.”

Pushing past Yamamoto-san, her fierce face loomed, clearing my mental fog.

“…School trip?”

Blood drained from my face. Not sudden—it’d been discussed forever.

“When!? How many nights!?”

“Next week. Three nights, four days. You got the handout. You and Kanade, whatever’s keeping you busy, do your part.”

Scolded by Kawafuji, I was beyond caring.

Next week’s school trip—four days away from home.

(School trip… no calendar plans…)