My Little Sister Is the Best F*p Material - Volume 7 Chapter 10: Time Spent with My Sister

Volume 7 Chapter 10: Time Spent with My Sister

Opening the living room door, I found my sister there, as usual. Miyu sat cross-legged on the carpet, back against the sofa, still in pajamas, watching TV while fiddling with her phone. Her hobby was searching for gadgets or clothes featured on morning shows.

I thought she’d head out after breakfast, but it seemed she had no plans today. Normally upright, her posture was slightly slouched—maybe from yesterday’s love hotel exertions? Noticing my gaze, she spoke.

“This position kinda eases my shoulders.”

“Big boobs, huh?”

Her long hair down to her waist, her perfectly proportioned petite frame—maintaining such cuteness required extraordinary effort. I admired how she hid that struggle even from me, living under the same roof.

Though she said it helped her shoulders, her breasts didn’t rest on her knees; they were just lightly held by her thighs. If she were naked, I’d revel in their erotic squish, but in clothes, the effect was muted.

“Thinking rude things about your sister’s body?”

“No way.”

Your brother always respects your naked form.

“If you could choose your breast size, would you go smaller?”

“Hmm… maybe.”

As I sipped cold barley tea, she glanced up, signaling for some, pondering. I expected her lolita fashion woes would make her choose smaller, but…

“This body makes you happy, right?”

She tugged her pajama collar, peering at her cleavage. Her breasts, puffed up like mochi in her cross-legged pose, gleamed sensually. Cross-legged is sexy.

“For a boob-loving brother, a big-breasted sister fits, don’t you think?”

Taking the glass from me, she said with growing confidence.

“If you were flat, I’d be into that too.”

“Liar. You’d pick Kanade for her chest.”

“No need to go there.”

Her resentment toward her burdensome breasts surfaced. I wanted to shut her sassy mouth with my usual tool, but I was out of ammo.

“No plans to go out? Thought you’d be glued to Haruka.”

“Overdid it during my period, so I’m taking a break.”

“Makes sense.”

Helping with work was fine without sex, but she probably rushed her schedule for me despite wanting to wait for her body to settle.

“Then, chilling at home today?”

“Why?”

“No real plans, just… it’s cool out. Wanna go shopping or something?”

Calling it a date felt like it needed a solid plan, and I wasn’t ready for that. Still, after Yamamoto-san’s comment, I worried our outing frequency hadn’t changed despite being lovers. Even tired, I’d be thrilled if Miyu wanted a date, so I hoped she felt the same. I needed confidence as her lover.

“Let’s go.”

She stood abruptly, heading to fix her hair and change without extra chatter. No conditions like “just nearby” suggested she was genuinely happy to go out with me.

I prepped to leave, waiting on the sofa. It took longer than expected for a simple outing. When she opened the living room door, Miyu emerged with voluminous twin-tails, looking adorable—more effort than our aquarium date. She wore a mature dress, but her baby face and hairstyle kept the lolita vibe. I preferred this over yesterday’s revealing outfit.

“Whoa… wow…”

“Thanks. I’m glad.”

We put on shoes at the entrance, checking for wrinkles or stray hairs in the mirror before heading out aimlessly.

“Just shopping nearby, but was it okay to dress up so much when you’re tired?”

I was thrilled, though.

“I got excited when you asked me out.”

Her face didn’t show it, but her joy ran deeper than her words. Without further agreement, we boarded a bus. Nearby options were just browsing manga at a bookstore or checking gadgets at an electronics store, but since she dressed up, I shifted our destination to the station area.

“If you call me cute, this outfit was worth it.”

Adjusting her dress skirt in the back of the bus’s two-seater, she murmured.

“I’m glad I asked if it means seeing you this cute.”

Facing forward, no clingy affection, just exchanging honest feelings. A great start to our sibling date.

(Since we left without a plan, I’ll check stores before we arrive.)

Searching the station area, I found a shop that caught my interest.

“Know this place, Miyu?”

“Never been. Taking me there?”

“If you’re okay with it.”

It was a lolita fashion store. Given Miyu’s custom cosplay habit, her unfamiliarity with mainstream shops wasn’t surprising, though she likely browsed with Haruka.

“Maybe sometimes.”

“Don’t come to places like this much?”

“Used to a lot.”

Her response wasn’t enthusiastic but not negative, so we went.

Following the phone map, we reached a quaint shop with cute clothes displayed in a large window. The small space wasn’t cluttered, styled with chic Western decor showcasing the outfits.

Miyu entered first, and I followed, a reversal from usual. Despite her reluctance, she tried several dresses against a mirror.

“Do these come in sizes like S or L?”

“They do, but most are free-size. The look changes a lot depending on the wearer—height and leg length especially.”

“Huh.”

As a guy used to separates, women’s fashion was a mystery. Free-size extended beyond dresses, apparently.

Expecting an eager clerk in such a small shop, I was surprised they stayed busy with inventory, leaving us alone. Browsing was fun, but with Miyu here, I wanted to see her try something on.

“Wanna try one?”

“Hmm… well, sure. I want to, but…”

She wanted to but wasn’t thrilled. Embarrassed to show me? Deciding, she picked a dress and asked the clerk to try it.

I nodded in greeting, letting her head to the fitting room. I could’ve wandered, but with other customers, I stood by the curtain.

“How’s it feel?”

“Uh, it fits, but… can you loosen this part…?”

“Loosen? May I check?”

Miyu barely opened the curtain, so I couldn’t see her, only hearing her talk with the clerk.

“It suits you! You’re slim, so no need to loosen. Want your boyfriend’s opinion?”

“No, um, the back’s really tight.”

“Oh, the upper ties… yes, there’s some creasing. Wow, they’re… big.”

“Sorry.”

“No, no, the ribbon can’t be loosened, sorry. We have looser similar styles—shall I get one?”

“No, it’s fine. Thank you.”

Hearing their exchange, I saw Miyu return in her original outfit. Disappointed, I couldn’t find words. She’d been friendly but left the shop sulking.

“That’s how it goes.”

“Thanks for the lesson.”

Not every outfit failed her, and many suited her body. But picking a cute dress only to find it tight on her chest naturally fueled her resentment toward her breasts.

“Haruka wears anything perfectly… she’d look cute in that too…”

“You get such a lovestruck look talking about Haruka in lolita clothes.”

“Sorry, but I love lolita Haruka as much as you.”

“Bittersweet.”

Hearing my rank is high, am I still underconfident?

“What about normally?”

“Just a lesbian pervert.”

“You two are close, huh?”

Yuka’s blunt assessment might not be entirely off.

“Wanna hit the arcade to unwind?”

“Sure.”

Going with the flow, we set the arcade as our next stop. No plan, but our casual dynamic made it fun.

“How often do you hit arcades, Miyu? Taking purikura or something?”

“Not much on my own. Yuka drags me to play shooters sometimes.”

“How far do you get?”

“Not too far. You play?”

“I’ve cleared a few with some coins.”

As a shut-in gamer, arcade machines felt like a waste of money. My experience was just casual, but years of gaming honed a decent instinct.

Since it came up, we played a shooter. More like close siblings than lovers, we cleared stages smoothly. Covering Miyu’s missed shots earned me her admiring glance, and though we burned through coins without prior knowledge, it felt good. Gaming was one of my few strengths, and seeing my skills pay off was satisfying. We tried racing games and other beginner-friendly ones, then left after a loop around the arcade.

“Tired?”

“Having fun, so I don’t feel it.”

Miyu wasn’t the outgoing type except with Haruka, yet she seemed livelier than this morning’s lounging self.

At the station, in the arcade, as noon approached, an inevitable encounter occurred.

“Oh, Miyu.”

Facing us was Yuka, her slim twin-tails contrasting Miyu’s voluminous ones, with a group of classmates.

“What’re you two doing?”

A fair question. Given Yuka’s deep ties with both of us, this must’ve looked odd.

“Just, you know, a date.”

Miyu grabbed my arm, pressing close, her face blank.

“If it’s a date, act more lovey-dovey.”

Yuka glared, making an unreasonable demand. Her friends buzzed—“Miyu’s with a guy…!” “Who’s he…!?”—stirred by Miyu’s contact with me. Yuka’s expression hardened.

“Seeing it up close, it’s wild… Miyu letting someone in her personal space like that…”

“That surprising?”

“At school, she doesn’t even let hair brush her passing by.”

Yuka sighed, palms up. Not unbelievable given Miyu’s personality, but that extreme?

“Really?”

I asked Miyu, cool as ever beside me.

“Not always.”

Not a full denial, so there was truth to it. Reassuring for a lover, right?

“Well, good to see you getting along. It’s a day off, so have fun.”

Expecting more pushback, Yuka just left with her friends, her parting look oddly smug. Something’s up—I’ll ask next time.

“Some of your friends know about us, right? What’s your standing at school?”

“Hard to say until school starts, but half don’t take it seriously, half accept it’s a sibling thing.”

We strolled back to the station, talking. Half accepting sibling romance was surprising, likely the fetish-heavy message group kids. Or maybe Miyu’s harshness with guys made it believable.

But it’s not just her school. Thinking ahead, we need to be more open, at least with those close to us. My lover-like dynamic with Yamamoto-san is convenient long-term. A three-way life—siblings plus a polygamous twist—could mask our taboo relationship. Legally, marriage isn’t an issue, but I plan to marry Miyu. Yamamoto-san’s presence helps, especially when we’ll eventually tell our parents. Miyu’s fixation on competing with her might be her reaffirming that resolve.

“Wanna grab lunch?”

As we crossed a signal to find a quieter spot, a large sign caught my eye: a seafood restaurant ad, piled with sashimi—fugu, abalone, luxuries I’d never tasted. Someday, as adults, I’d love to eat there with Miyu.

“Wanna try?”

Peering through her bangs, she casually suggested it. I’d been the one dreaming of fancy food, but Miyu, with her trips with Haruka, had likely eaten plenty.

“It’s near a port station, like an hour and a half by train.”

“Special express gets us there in thirty minutes.”

“That’s an option?”

Her travel savvy outshone mine—I hadn’t considered such upscale transport. Her suggestion led us to the ticket gate.

“Just came out to kill time, but this turned into a proper date. You okay stamina-wise?”

“Yup, fine. Don’t worry about money—if you’re good, let’s go.”

“Deal.”

Not a bullet train, so not crazy expensive. I’d quit my job, so I needed to save, but skimping on dates defeats the point.

We bought express tickets and boarded reserved seats. Comfortable, wide chairs faced forward, not stuck to the window. The cloudy sky hid distant views, but the scenery felt novel without other passengers’ eyes. I sat on the aisle, stealing glances at Miyu’s cute profile as she fiddled with her phone, occasionally looking out. Her natural ease relaxed my tension about keeping conversation.

Unlike her travel-savvy self, she wasn’t excited by express trains. With friends, she might chat lively, but as siblings, our bond didn’t need constant talk—we shared the same homey comfort.

“You done with gaming, Onii-chan?”

Miyu broke the silence, likely thinking about my arcade enthusiasm.

“Majomaru’s awkward to log into now. Too busy with physical stuff, no time. Maybe after exams.”

“I see.”

Focused on manga, she kept glancing at me, making me restless.

“Why ask?”

She powered off her phone, tucking it away.

“You sold your games and quit online ones for a girlfriend, right?”

“Yeah.”

“It was necessary, but I suggested it. I felt bad if I took your hobby away.”

She worried that while her lolita cosplay life was respected, my life had changed drastically.

“My life’s more fun now, so don’t worry. I’ll talk if I find a new hobby.”

My eroge were just sex substitutes. I played the big titles but wasn’t attached to their stories. With all this sex, I had no complaints.

“Games can be rebought. But your bond with Haruka—if it ends, it’s hard to restart. So, I want you to see it through properly.”

She’s set on no sex with Haruka, but I wouldn’t mind if they got touchy. Honestly, I’d love to see them flirt. Her hidden album probably has those photos—I’d kill to peek.

“Good. I’m not showing Haruka’s photos even if I die, but I’m glad you feel that way.”

“Not even right before you die?”

“Absolutely not.”

Seems showing those photos was less forgivable than cunnilingus. It’s a private hobby, so I won’t push.

We fiddled with phones or napped, spending sibling-trip time until we reached the station. A bus could take us to the ryokan district, tempting an overnight stay. The wide shopping street, despite the crowd, led us to the advertised restaurant. Offering only course meals for lunch, it had a ryokan-style interior but wasn’t exclusively upscale—just a standard Japanese eatery.

Seated at a six-person dugout table due to availability, we stretched out on tatami. You could lie down, perfect for sake-fueled group dates.

“Not something we could do outside summer break.”

Settling in, Miyu fixed her wind-blown twin-tails with a folding mirror. Express seats and reservations were possible because it was a weekday student holiday. Pure luck—weekends wouldn’t work.

The food was phenomenal, a taste my life hadn’t known. A bit older, I’d have downed sake. I don’t know its taste, but Miyu pouring hot sake would make me drink endlessly.

“By the way,” I said, my stomach full, intending to savor the meal’s aftertaste. The food seemed to have fueled a sudden curiosity.

“That outfit—does it count as lolita cosplay?”

“Huh? Why?” Miyu replied, purely enjoying the meal and date, forgetting her adorable lolita look.

“I know those dresses in your closet were too much, but is it okay to have sex in a cute outfit like this?”

“Sex with your sister in clothes isn’t exactly recommended,” she teased.

“Feels like you’re less against it lately.”

“Hmm… I won’t deny it.”

Back when she only let me cum in her mouth, sex in her favorite clothes was a no-go. Now that we’ve gone all the way, her resistance has definitely softened.

“Wanna do it?”

“Someday, maybe.”

“Someday? That’s enough?”

“Y-Yeah.”

Her stare made me look away. After all that creampie sex yesterday, admitting I wasn’t ready to cum again was impossible.

“It’s a fun date, so maybe sex is extra today.”

Besides, we were in a dining private room—not a bar, and daytime sex felt wrong. Ejaculation belonged at home or a love hotel.

“But you seem to want it,” she said.

“W-Well…”

Miyu slid next to me from across the table, her cute face close. Her pale legs peeking from her floral dress were enough to spark an erection.

“But I agree, it’s not the vibe for sex,” she added.

“Right.”

“So, as long as it’s not sex, it’s fine, right?”

“What are you saying?”

I caught her meaning instantly. My unwanted arousal was the issue—get rid of it, and we’re good. I almost asked if that was okay, but her eagerness suggested she was horny too. After all that creampie sex, her womb might still be tingling.

“If you’re feeling it too, I’m not hesitating.”

She seemed to agree, not holding back out of shame but something else.

“I do want sex sometimes, and not being open about it is my issue,” she admitted, pressing close, whispering in the private room. “I actually kinda like being dragged into your lust and made to use my mouth or whatever.”

She preferred me begging her—it turned her on. What a troublesome sister. I’d play along.

“H-How much do I take off?”

“Hmm… toilet-level, maybe?”

Just unzip, then. Was that really okay for her pure, lolita look? Your brother’s not stopping now.

“Then, this.”

Without shifting, I unzipped my pants, exposing my erect cock halfway. Hidden by the table, it looked normal from the door. Miyu leaned down, her mouth enveloping it.

Warm, slick pleasure hit me. She didn’t suck hard, just gave the minimum stimulation needed to make me cum. The quiet air of her sucking was intensely erotic, enough to push me to climax.

Her twin-tails kept her hair neat, and I caught glimpses of her lips as she bobbed, my cock sliding in her mouth. I loved watching it most. This wasn’t about enjoying a blowjob’s sensation but a mechanical act for release. Following my rising urge, I signaled with twitches and came in her mouth. Silently, semen shot out—biyu, biyu—ending in the quietest ejaculation ever.

“Nn… done,” she said, swallowing, finishing the minutes-long act.

“Thanks.”

My devoted sister, eager for praise, offered her head. I petted her until the waiter brought the check.

With lust and hunger sated, and the date fulfilling, we headed home. Skipping sightseeing felt like us—sibling-like. We caught a perfectly timed express train back, sitting side-by-side with Miyu by the window.

Since leaving the restaurant, Miyu was quiet, fidgeting her thighs—a shared signal. Even if cumming satisfied her, it didn’t fully quench her lust.

“Horny?”

She turned, cheeks flushed, unashamed. “Yup.”

Straightforward. Could I slip a finger under her skirt unnoticed?

“Wanna touch a bit?”

“Hmm… maybe.”

She leaned toward no, not committing.

“Later at home?”

“Hehe, I’m thinking that, but I’m torn.”

Horny and in agreement, what was she hesitating about?

“Right now, I want love more than good sex.”

She leaned close, lips near but not touching, confessing boldly, “I love being turned on by you and feeling frustrated alone.” Back when I only came in her mouth, her instincts forced her to get aroused and handle it alone—not a bad memory, but a kind of play now.

“Kiss me a lot when we get home.”

She craved kisses over vaginal stimulation. Unable to refuse, we only intertwined fingers on the armrest during the ride. At home, we shut the door and kissed immediately.

Her mouth was hot from holding back, our sticky saliva fueling our lust. Despite cumming hours ago, I already wanted to with her again.

I wanted to move to foreplay and sex, but that wasn’t her desire. So, we kissed endlessly—from the entrance to the living room, through dinner, bathing, and even in bed.

“M-Miyu… can I cum soon?”

I hit my limit first, though her light climaxes from kissing meant neither could last longer.

“If you cum like this, sure.”

Rubbing my erection against her stomach, she smiled loosely. She wanted me to cum kissing in her usual clothes. I could probably cum from kissing alone, but it wouldn’t fully satisfy her.

“Nn, ah—!”

Keeping our position, I lifted her pajama top, rubbing my raw cock against her skin. This gave me physical pleasure, and stimulating her womb externally should make her cum fully. Pressing my cock near her navel, I thrust, and she convulsed.

“Fua, ah, that’s… nn… cheating… aah, ah…!”

“Miyu… feels good… Miyu…!”

“Miyu… Onii-chan… Onii-chan…!”

When breathless from climax, we paused, then resumed with tongue, continuing the act. One final creampie should end it cleanly.

“Uh, no vagina today…”

“Creampie won’t stain clothes, right?”

“It will wrinkle or leak if it’s intense.”

Our sex didn’t need fast pistoning, so creampies stayed clean.

“It’s weird, but today I want your love.”

“So, a creampie shows that.”

Her instincts only allowed mouth or vaginal ejaculation—love drove the creampie. I didn’t get what she meant at first.

“Continue from outside?”

She nodded eagerly. Today’s Miyu was the dutiful sister mode, moving for her brother’s requests, staying rational even in our heated state. She’d said her core self was overtaking her instincts—her rational desire now suppressed her reproductive urges, embracing her fetish of being used for my pleasure.

“If you really want a creampie, I won’t say no.”

My suggestion was for my own urge and to make her cum, but she didn’t like that. Aroused by my lust, she wanted me to use her selfishly.

A creampie fit her logic, but we’d overused her vagina since starting sex. Like the freshness of oral ejaculation, she likely craved variety.

So, I stripped her top, exposing her bare chest, and straddled her breasts.

“Can I cum here?”

I’d neglected her beloved boobs. She’d cursed her large chest, but loving how it aroused me made her embrace it.

“Go ahead,” she said, joyfully watching her breasts jiggle with my thrusts, thrilled to be used for my ejaculation.

No intense sex was needed. Like the quick blowjob for relief, I used her breasts solely to cum. Minimizing nipple stimulation to keep her sane, I sped up for the finish.

Under her blissful gaze, I clamped her breasts around my cock and came. The hot semen made her pant, as if climaxing herself, despite just lying there.

I didn’t have her drink the semen. Scooping it was a hassle, and wiping it off with tissue for the trash felt more like “disposal,” suiting us both. Her instinctual self wouldn’t waste my semen, but her core self’s lust now dominated.

“Phew, refreshed.”

“Hehe, good job.”

In pajamas, lying beside me, she looked utterly satisfied despite no vaginal stimulation. Maybe kissing, womb teasing, and rough breast use mimicked vaginal sex for her.

“Am I a bad sister for wanting such weird sex?”

Her fetish, as unique as Yamamoto-san’s exhibitionism, might turn some guys off, even with her cute lolita charm. But I loved her for it.

“I want to love you as you are.”

She valued me as irreplaceable because I loved her authentically. I wasn’t forcing myself to match her—I naturally adored all of her, making her crave me. No lies; I loved everything about her.

We’re siblings having sex, planning to end a convenient relationship with another woman for our future. That’s the only path to our happiness, no matter how tough. Understanding Miyu meant embracing that.

“Stay my Onii-chan forever.”

Clinging to me, she fell asleep as usual. Lovers, someday spouses, parents—but we’d always slip back to siblings, loving each other. Hoping our life stays erotic and fun, I hugged her back with optimistic dreams.