My Little Sister Is the Best F*p Material - Volume 8 Chapter 10: The True Wife

Volume 8 Chapter 10: The True Wife

T/N: Fughhhh… I so wanna drop this after seeing that Yamamoto’s arc ends like that. Hoped for a harem ending… Guess I’ll continue just in case

While Miyu slept, Yamamoto-san and I cleaned the room. The sheets, soaked with the juices of two beautiful girls and my semen, weren’t thrown out but washed for reuse. Yamamoto-san, capable of anything when determined, could love me and still marry happily. When she declared she’d keep using me as masturbation material, I clutched my head, but maybe it’s common for women, so I let it go.

“Still, Miyu-chan’s sleeping soundly. Not even a comfy sofa.”

“She might sleep anywhere.”

“Maybe she’s awake.”

“Haha, no way.”

Spending more time in this room was good. It held sad memories for Yamamoto-san, so leaving it in a warm atmosphere was fortunate for both of us.

“School starts next week. Skipping the first day for sex feels wild in hindsight.”

“Wild, right? Your fault I’m hooked on the thrill of immorality. I might do it tonight.”

“My fault? You sure you’re okay so soon…?”

Yamamoto-san’s fully recovered, her words dripping with lust. It’s great she’s so positive, but is it okay to be this carefree?

“Hm? Future talk? I’ll keep it secret. I’ll relive our sex like it was yesterday…”

She put her hands to her cheeks, dreamy. She plans to masturbate to our sex even with a new guy.

“Secretly, huh.”

“I won’t tell. It’s our memory, locked away until the grave.”

Grinning, she continued cleaning. It felt harsh, but since it’s an unforgettable memory for her, I wasn’t sure if I should comment.

“For you and Miyu-chan to stay strong, you need this too.”

“…Huh?”

Before I could ask what she meant, a shadow stirred on the sofa.

“Nn… fua… huh… why am I…”

Miyu woke up. We were dressed, but she was naked under the blanket. Her pale, plump breasts peeked out, and she glared, covering herself.

“Don’t stare.”

Yamamoto-san reacted to Miyu’s grumpy face, approaching with a sleazy smirk, waving her long fingers.

“After all we did, nudity’s fine. We know each other’s best spots…”

“Don’t put weird ideas in Onii-chan’s head.”

Miyu’s embarrassment and Yamamoto-san’s advance made me curious about what they did while I slept, but they wouldn’t tell if I asked.

“I’ll shower.”

“Go ahead, use anything.”

Yamamoto-san seemed fond of Miyu, almost like friends. Maybe their intense clash left something behind. The result of their sincerity?

As Miyu and I prepared to leave, Yamamoto-san’s expression was unmistakably bright at the door.

Stepping outside, the lingering blue sky made us squint. Despite only a few days here, the room felt like a second home, and leaving it brought undeniable sadness. But, for Miyu and me, this was literally our time to spread our wings.

“Miyu-chan, Sotomichi-kun. Thanks again for everything. I love you both.”

In a T-shirt and knee-length pants, Yamamoto-san’s slim silhouette, accentuated by her ample chest, was stunningly erotic even in daylight. Being loved by her gave me unshakable confidence. She gifted me so much.

“See you at school, Sotomichi-kun.”

“Yeah, help me with studies too.”

“Top priority, just say when.”

Her beaming smile softened mine. Even this exchange felt loving. Her bright, happy smile defined Yamamoto Kanade’s charm, and I hoped to support her life ahead.

“Miyu-chan.”

Called, Miyu faced her tensely.

“It’ll be tough sometimes, but rely on me anytime.”

Yamamoto-san spoke like a kind older sister, her encouraging words carrying weight. Miyu, reading her intent, bowed deeply with resolve.

“Thank you.”

It was a heavy, earnest reply, like greeting her in-laws. Miyu once said we needed as many blessings as possible. The “tough times” Yamamoto-san mentioned—the walls we’d face—required trusted allies. That’s why Miyu bent her principles for Yuka, Haruka, and Yamamoto-san, upholding utmost loyalty.

“I’ll always cheer for you. Come back anytime.”

Hugging Miyu, Yamamoto-san saw her relaxed, relieved expression. Miyu had been so tense.

“Sotomichi-kun, Miyu-chan. I love you.”

With her vibrant love, we finally left the apartment.

It wasn’t a final goodbye. She’d likely be our longest companion. But first, I needed to face Miyu. I’d kept her waiting.

“Your bag’s bulging.”

On the way home, I noticed Miyu’s shoulder bag, stuffed beyond what a style-conscious girl would allow.

“Souvenirs from Kanade-san.”

She rummaged, pulling out a plastic bag full of familiar individually wrapped items.

“Why so many condoms? You using them?”

Miyu’s on the pill, so I didn’t need them. I’d already creampied her multiple times.

“Maybe in a few years. It’s not good for me long-term.”

“Oh, too many raw creampies mess with your mind?”

“Not just that. I’m fine with side effects, but long-term use hurts kidneys or blood pressure.”

“Oh, really? No need to push it. Sorry.”

I thought the pill was just for preventing pregnancy. It’s more complex. And costly.

“I let you go raw early to beat Kanade-san. It was faster than planned for us.”

“Got it. Should we use condoms starting today or tomorrow?”

“Uh, no, you don’t have to stop so suddenly.”

Blushing, she stuffed the condoms back. If she’s okay waiting years, I’ll follow her pace. She has her reasons.

“When I heard your plan, I was worried, but I’m glad Kanade-san was lively to the end.”

“…Yeah, after all that lovey-dovey time you two had.”

Miyu replied curtly, and we walked in silence.

“…Huh?”

I stopped. A few steps ahead, Miyu turned her head, urging me to catch up. I hurried after her.

“No way… you were awake?”

“Awake or woke up. I woke on the sofa to you and Kanade-san being all lovey like lovers, so I endured chest pain and went back to sleep.”

“Sorry…”

“Well, it’s not a big deal.”

The lovey-dovey sex with Yamamoto-san was, at its core, orchestrated by Miyu. But waking up to see your man being so intimate with another woman would stir primal emotions that aren’t easily calmed.

Or so you’d think, but Miyu didn’t seem too upset. Her walk, her expression—they exuded confidence, almost like a wife’s poise.

“You seem surprisingly okay?”

“Somehow, yeah. Maybe because I’ve seen you with Yuka, Kanade-san, and Sachiko too. It doesn’t linger.”

“Really?”

Miyu had witnessed every girl I’d been with. If she’s used to it, that makes sense experience-wise, but is that how relationships work?

“Didn’t you say you absolutely hated me being with other girls?”

That stuck with me. I thought Miyu was much more possessive compared to others.

“I can say that because I trust you won’t cheat. Everyone still loves you, and you’ve become such a great guy. You’ll probably be popular from now on.”

Miyu spoke calmly, her profile peeking through her long black hair, looking amused.

“Lately, I’ve even felt a bit of superiority.”

Scratching her cheek with her index finger, eyes forward, she shyly spilled her true feelings.

That was an unexpected shift. I thought Miyu preferred an exclusive bubble with her lover. She used to reject any affection toward me as impure, even if positive.

Had her experiences given her this much confidence? Her voice sounded softer than when I first caught her masturbating.

I thought Miyu, being perfect, couldn’t change. But maybe, as Yuka once said, I hadn’t fully faced Miyu as just a girl.

“I’m someone who can only love one person in my life. I know that’s heavy. If you left me, I’d probably die. Early on, I was full of anxiety, wondering if you’d be okay with someone like me.”

Miyu took my hand, intertwining our fingers slowly.

“But you’re mine from head to toe. My whole life, until I die, is yours. I realized that’s an absolute certainty. I’m not anxious anymore.”

Walking a step ahead, she swung our joined hands, smiling shyly.

Though late August’s heat lingered, a refreshing autumn breeze blew through the residential area.

“Miyu…?”

Her girlish smile made my ears ring, lifting me from reality. The path stretched, my throat burning like I’d swallowed boiling water.

To see Miyu smile so naturally.

I’m such an idiot. I’m tearing up.

“Hm? What’s up?”

When she replied, her face had returned to its usual calm.

“Miyu, just now…”

“Yes?”

Her hair swayed as she tilted her head. I’d seen her smile before—wildly during sex. But now, she wasn’t driven by lust.

My reserved, serious, adorable sister. Neutral, authentic Miyu smiled, trusting our bond.

“No, nothing. I’m glad you’ve got some leeway now.”

I brushed it off. She seemed suspicious but didn’t pry. Even her lustful, mating-driven side is undeniably Miyu. I don’t think her past smiles were fake, but this moment felt like an achievement.

“Weird. …Hehe, it’s fine.”

Her cheeks softened, and she walked lightly beside me. She’s really smiling more.

“I’ll never let another man touch my skin, so don’t worry.”

She hugged my arm, pressing her ample chest against it, ensuring my arm felt her body. Her slight grimace at the awkward fit was adorable.

“Thorough, huh.”

“Your sister only.”

Such a dramatic way to state the obvious. But for Miyu, who prefers being my sister over a lover, being “Onii-chan’s sister” might mean more than words.

“By the way.”

Pausing the conversation, she looked up with that cute, sulky face.

“I’ve held back so much for this plan. I’m gonna be selfish for a while. Keep up.”

Her pouty tone emphasized it. She’d suppressed her desire to be with me for the plan. Now, with grudges cleared, she’s venting. I think we’ve had plenty of sex, but…

“Of course. I’ll match your pace from now on.”

There’s nothing I’d prioritize over her. After these days of sex, I just want to be lovey-dovey with her.

Eager, we returned home. Opening the door, Mom emerged from the laundry room, mid-wash from her trip.

“Oh, welcome back. Skipping school suddenly—are you okay?”

Dad, noticing our return, stepped out of the living room, eyeing Miyu standing unusually close to me.

“Where’ve you been?”

We’d texted Mom we were sick, skipping details. Miyu, slipping off her shoes first, answered.

“Sleepover date with Onii-chan.”

Her bluntness could’ve been softer, though it was better than lying.

Dad’s eyes widened, but Mom nodded calmly. Women’s understanding, maybe?

“A sleepover with no luggage?”

“Just one night.”

Miyu said, heading to her room. Watching her, I followed.

“Dad, what about work next week?”

“Same old. Weekends off, then dawn to dusk. …What’s up with you two?”

His question targeted me. My matured face and body from this summer hinted at an unusual history. Beyond Miyu, my secrets with her friends and Yamamoto-san were heavy.

“I’ll explain soon. …Miyu’s doing better.”

“Good. That’s what matters.”

Since that elementary school incident, our parents worried about Miyu’s forced maturity. But her friends and grades reassured them it was just growth. Seeing her regain her childhood brightness thrilled them, and they likely sensed significant events behind it.

Dad said, “Good job,” and returned to the living room. As I climbed the stairs after Miyu, Mom called.

“Ko-chan.”

Turning mid-stair, I saw her bittersweet smile, speaking softly.

“Don’t be too loud.”

I replied, “Yeah,” not fully grasping her meaning. Facing forward, I realized, unable to suppress a wry grin.

From Miyu’s demeanor, Mom knew about us. And Miyu’s involved. I’d need to question her later.

“Haa…”

Back in my room, I flopped onto the bed. I hadn’t planned to stay so late at Yamamoto-san’s, but my school bag held homework and books. Exhausted from two days, I had no energy despite the early hour. Miyu didn’t come to my room, heading downstairs after her door opened.

I scrolled through neglected video sites on my phone, then Miyu called me for dinner. In the living room, she and Dad were seated, setting up a rare family meal.

Mom’s cooking was a rare treat. I picked up some simmered vegetables with my chopsticks. Every household has its flavor, and while Miyu mimics Mom’s style for simmered dishes, it’s the one taste I’m used to.

“Ko-chan, decided on your future this summer?”

“I’ve been studying for exams. I’ll think about university after the next mock test.”

“Come on, dear, it’s a rare family meal. No serious talk.”

“True, but still…”

Mom glanced at me worriedly while setting the table. I get it—she’s concerned because I’m responsible for Miyu. Parental instinct makes her want to butt in.

“What about Miyu? Don’t you worry about her?”

She’s the one in the thick of exam season, yet they don’t ask about her progress or plans.

I tried deflecting, feeling it a bit unfair, but both parents just widened their eyes.

“Worry about her? No way.”

“As if we would.”

I get it. Even I’m not worried about Miyu. With their thick trust in her, they’d never fret.

“Ko-chan’s got it tougher. Think about prep school.”

“Well, yeah…”

Post-summer, more classmates are attending prep school. I’m motivated, so it’s not like I haven’t considered it.

“There’s someone like a prep school tutor, right?”

Miyu, sipping soup quietly, tossed in a casual remark.

“Someone that great?”

“Onii-chan’s got the smartest, most beautiful, busty friend in Japan.”

“Bring her over sometime.”

“Dear, behave.”

Mom scolded Dad, who seemed genuinely excited, and he quieted down.

The family chatter continued. Our parents shared long travel stories, and Miyu and I, more talkative than before, made Mom smile happily.

After dinner, I bathed after Miyu and lay on my bed, staring at the ceiling.

“Haa.”

I couldn’t bring up Miyu. From dinner’s vibe, Dad’s clueless. Mom’s waiting for us to sort things out, meaning I need to tell him myself.

(Just blurting it out won’t do.)

I can’t predict Dad’s reaction, but honesty might be easier. Despite our parents’ laid-back, tolerant nature, there’s no guarantee they’ll accept our relationship. Still, splitting up isn’t an option for Miyu and me, so we’ll push forward, even if it risks estrangement. Even with Mom’s help, I need to think and act.

Knock knock. “Onii-chan, you there?”

Miyu’s voice came with the knock. I answered, and she entered, wearing silky, tight pajamas that looked erotic on her busty frame—her sleep-with-me outfit.

“What’s up? Bedtime already?”

“Partly, but I came to discuss our future.”

“Good timing. I’ve got something to ask you.”

“If it’s about Mom, I told her everything up to getting the pill at the gynecologist.”

My quick-witted sister saves me.

“So… how much does she know?”

“Probably that we’re dating and having sex.”

As expected. Is that okay with her?

“She didn’t say anything?”

“I’ve been talking to her about my worries since elementary school. Like maybe I liked girls, or you, or feeling sexual and wanting the pill. We’ve had those talks over time.”

Got it. Mom knew Miyu’s struggles from childhood, so she was prepared when Miyu’s feelings landed on her brother.

“That explains her comment. …Alright, I’ll tell Dad.”

“Thanks. Also, we’re still sleeping together, right?”

“Of course.”

We might get caught sharing a bed, but sleeping apart is unthinkable now. Miyu seemed to agree, wanting us to share as lovers.

“One more thing.”

Yeah, probably that.

“We’ll have sex too, right?”

“Yup.”

Even with parents downstairs, a life without sex with Miyu is less imaginable than separate beds.

“Sorry to ask when you’re tired, but the first day sets the tone.”

“True. Shall we do it lightly?”

So, a bit forcefully, we decided to have sex.

“Oral okay?”

“Finishing in your mouth is fine, but let’s undress each other.”

“Y-Yes.”

For our future. I stripped off my pajamas and boxers, then Miyu got naked. Her loli, busty, erotic body never gets old.

“Staring at your sister’s body lewdly again.”

Your body’s too erotic.

“But your thing’s still small.”

“Shot too much yesterday and today.”

“You came an insane amount.”

Half of that’s your fault.

“Hehe. I love this acorn size too—it’s cute.”

“Mixed feelings as a guy. Anyway, can you lick it?”

“Sure!”

Miyu replied casually, popping my penis into her mouth. She rolled the rounded, foreskin-covered glans with her tongue, playfully sucking it in and out. She’d complained about my cock getting too big, so she must really prefer it small, as she said.

“Nmu… hamu… churu… nchu… herorero… ah… nn…”

“…Fuu, this feels good too…”

Getting licked while soft isn’t something I experience often. With the sex we’ve had, this might be a one-time thing.

“You get hard so fast, Onii-chan.”

Miyu teased my libido, then took my soft cock back in her mouth. Most of our sex started with me aroused, approaching her. When I showed her my cock, it was already hard, and she only dealt with it in that state.

“When it’s small and covered, is it better peeled back or left as is?”

“Uh, that’s a tough question.”

What a sister, innocently poking at her brother’s vulnerabilities.

“Not peeling it feels fresher, so it’s nice.”

“Hmm, how about this?”

Miyu pulled her mouth off, extending her tongue to slip into the gap between the foreskin and glans.

“Oh, ah… that’s… intense…!”

The unexpected inner-foreskin licking sent a surge of pleasure up my spine, stronger than her usual blowjobs. She licked clockwise, counterclockwise, and when the skin flipped, she pushed it back with her lips, meticulously licking the space between.

Hero… reroo… chupu… chuppu… haa… ero… reero…

“Aaah… haa… amazing… feels so good…!”

She kissed the tip where the glans peeked out, sucking and making lewd chupa chupa sounds, relishing my small cock.

To think my sister could do this with her brother’s penis. She’s gotten too erotic. I loved watching her obsessively lick me. I wanted to cum in her mouth, but…

Amu… chuu… hero… haa. “Finally thumb-sized. Ready to cum?”

“It’s insanely good… but today, it might be tough…”

“Right, after all that.”

No matter how hard I tried, cumming seemed impossible. Even with this stimulation, I couldn’t get hard. I must be completely drained.

“Sorry, just me.”

“Wanna do me?”

“Still shy?”

“Partly, but I’m not in the mood.”

Her face was flushed with arousal but not in primal mode. Did my inability to get hard ruin the vibe? Not entirely my fault, but I felt bad.

“You’re not holding back, right?”

“Not dodging out of shame. You’re not super aroused either, right? Usually, you’re so intense it’s scary.”

Guess she sees my predatory side.

“Like I said before, I don’t get in the mood unless you’re horny.”

She said that at the hot spring. I thought it was just to tease me, but it’s true.

“When you’re not horny, assume I’m not either, mostly.”

She added there are rare exceptions. What a tricky trait. Her libido syncing with mine—how does she feel about that as a sister? As lovers, it’s great compatibility.

“Let’s call it here then. Sorry for half-assing it.”

“It’s fine. You’re just tired. You’ll bounce back after a night’s sleep.”

Right, two beautiful girls wrung me dry, and my brain’s rejecting more. My balls are empty, but sleep will fix me, and I’ll be ready for Miyu again.

“But your moaning needs work. Mom and Dad probably don’t want to hear that.”

“Sorry.”

I’ll try to keep it down. I’m curious how Miyu handles her moans during full-on sex.

“Sleep naked?”

“Absolutely.”

Miyu eagerly climbed into my bed naked, leaving her underwear scattered, and pulled me under the covers. Influenced by Yamamoto-san or always this way, she’s become quite the erotic sister.

“Good night, Miyu.”

“Good night, Onii-chan. Don’t sneak it in if you get hard while sleeping.”

“I won’t.”

Joking like that, we savored each other’s bare skin. I didn’t get hard, and sleepiness took over. After all that cumming, expecting more sex today was a mistake.

Tomorrow morning, I’ll wake naked Miyu and have her blow me. Having an erotic lover makes every day exciting.

With those expectations swelling, I ended a long day. Parting happily with Yamamoto-san, lovey-dovey with Miyu—a perfect ending. Thinking I had no worries left, a sudden thump of my heartbeat brought tension. I recalled my parents’ interactions.

Yamamoto-san’s insistence on facing the fact I chose my sister, combined with Miyu’s unique libido syncing with mine, will become a real issue as our sex frequency increases. Maybe Miyu and Yamamoto-san’s strategies considered this future.

(No need to end a happy day with anxiety.)

It’s important, but today was like an anniversary for me, Miyu, and Yamamoto-san. Shelving tough issues for tomorrow, I gazed at my future wife’s sleeping face, cherishing the happiness in my arms.