My Little Sister Is the Best F*p Material

Volume 9 Chapter 05: No Way My Sister Could Be This Lovey-Dovey

Miyu’s fever persisted into the evening, her temperature still high. I made some easy-to-digest porridge and brought it to her room, sitting beside her as she propped herself up in bed.

“Probably getting hungry, right? Eat what you can.”

I pulled the table closer, setting down the bowl, and stroked her head while waiting for her sleepy eyes to clear. Each time my hand touched her hair, she closed her eyes like a cat, her face softening into a blank, relaxed expression.

“My head feels all fuzzy…”

She’d never show this carefree side to anyone else. Maybe she’s always wanted to let her guard down like this with others. I want to be the one she can do that with for as long as possible.

“I’m hungry, Onii-chan. Nn.”

With a glance, she signaled “feed me.” I scooped a spoonful, blew on it, and brought it to her mouth. She just stared at me without opening up.

“Not eating?”

“No, I want you to say ‘ahh.’”

Her wide eyes locked onto me earnestly. She’s seriously milking this fever for all the pampering she can get.

“Fine. Here, ahh.”

Hiding my embarrassment, I indulged her whim. She chomped the spoon, her cheeks softening with a happy grin, unusually chipper.

“That fun for you?”

“I don’t catch colds often, so I’ve kinda always wanted this.”

Miyu’s usually cool, sharp-tongued, and rational. Maybe as a reaction, she craves cliché romantic moments and play more than most.

I kept up the “ahh” routine until she finished eating. Still unsatisfied, she snuggled closer, parting her slightly overgrown bangs and giving me a pleading look with an “um, um.”

“I want to do that classic thing you do when someone has a fever.”

Her roundabout request stirred my lust a bit—she knows it. But I couldn’t refuse.

“I’ll get hot water. Stay put.”

“Okay~”

She replied with childlike obedience, burrowing back into her blankets. I filled a basin with warm water, soaked a face towel, and swapped it for the dishes in her room. The classic thing? Wiping her down since she can’t bathe.

I set the basin on the table and reached for her pajamas. As I lifted them, revealing her underwear, she resisted slightly.

“It’s so embarrassing, I might heat up again.”

“You asked for this.”

Sure, I’m half-treating it like play. She made no move to undress herself, so I handled her underwear too. When I unhooked her bra, she covered her nipples while slipping off the cups. I rarely undress her, so in the silent room, exposing her bare skin felt undeniably erotic, even if we weren’t speaking.

Her mature breasts and the curve of her back gleamed. Good thing I drained myself last night—I might last two days like this.

I slid the wrung towel over her pristine skin, slightly red from long sleep. She squirmed with a sultry “nn,” ticklish. From there, it was a battle with my self-control.

“Want me to do the bottom too?”

“Yeah. All of me.”

Answering, she hooked her thumbs into her panties, sliding them and her pants off. Her back muscles cradling her heavy breasts and the plump curve of her butt formed a luscious, bun-like silhouette. …My limit’s probably tomorrow.

I wiped her skin with half-closed eyes to avoid staring. Reaching around, her breasts inevitably brushed my arms. Blocking my sight only highlighted the size of her chest, mismatched with her petite frame. I wanted to grope them and cum between them.

“Done.”

“Thanks, Onii-chan.”

She changed into fresh underwear and pajamas, slipping back under the covers. My crotch was, predictably, rock-hard.

“Nfufu. Too bad your sister can’t help you cum.”

“No day’s been more regrettable.”

“I’d drink it if you jerk off.”

“Can’t ask that of a sick sister.”

“Then hold it in ‘til I’m better. I’ll drink it all.”

Smirking like a little devil, she pulled the blankets tighter, as if saying, “Not now.” She’s riding this fever excuse hard. She’d better not back out when she’s well—I’ll make her drink every drop.

“I’m gonna shower. Then I’ll come back to study.”

“I love that you’re here, but don’t you get tired of studying?”

“It’s surprisingly okay when I organize what I need to do.”

Efficient study methods are everywhere—books, the internet—but their success depends on the person. Lately, I’ve followed Yamamoto-san’s advice: set goals, break them into tasks, and work through them. It suits my completionist gamer mindset.

“Gotta thank Kanade-san for that.”

“Yeah.”

To get into a decent university, someone like me—below average academically—needs an early start and effort. Blindly grinding kills motivation, but Yamamoto-san’s method has sped up my schoolwork.

During a study break, I did some quick exercise in my room to burn off lust, then showered. Back in Miyu’s room, she greeted me with an “welcome back” while holding her phone. I resumed studying until bedtime, flipping pages quietly to not disturb her sleep. But when I glanced at her, she was wrapped in blankets, staring at me intently.

“Am I keeping you up?”

“No, just admiring your profile.”

“It’s not that great.”

“You’re cool, Onii-chan. Even without sister bias, you’ve gotten so strong. I never get tired of looking.”

Her fever made her words blunt. Sister bias? Whatever. Between beauty tips, fashion advice, and a summer of sex outdoing any gym, my growing confidence as a man has shaped me.

I never cared much about looks or skills, and Miyu doesn’t demand more than a brother. Still, gaining status to walk proudly beside her benefits us both.

“If I can keep being spoiled, I wouldn’t mind staying sick.”

“You don’t need a cold to be spoiled, but I want you better soon.”

“Being taken care of is different from just being spoiled.”

She’s savoring the caregiving itself—our sibling-like, family-like bond. Even now, she loves me more as a brother than a man, though sexually too.

“I hope you take care of me lots tomorrow.”

Miyu spent the day in this lovey-dovey state—but then came the next morning.

“Here.”

In her room, she handed me the thermometer. 36.5°C—perfectly normal.

“Feeling okay?”

“Not bad.”

Her sharp, cool gaze returned. Her mental state seemed back to normal with her temperature. Or so I thought.

“I’m gonna shower.”

Cutting the conversation short, she headed downstairs to wash off her sweat.

Her recovery meant sex was back on the table. Her abstinence promise wasn’t long, but she said she’d drink it when better, so I planned to have her take care of me. School starts tomorrow, making it harder to ask.

After showering and changing in the bathroom, she climbed the stairs in familiar casual clothes, her skirt swaying. We met in the hallway.

“Oh, Onii-chan.”

Seeing me, she froze. After a few seconds of staring, her cheeks flushed, and she looked away.

“Something wrong?”

“No, nothing.”

She hurried to her room. I don’t know what’s up, but her current mood makes asking for sex tricky. I’ve got some leeway with my lust, so I’ll try again later.

Later, I called her down for breakfast. Our parents were already out, leaving the house to us. We’re both homebodies, and we’ve mostly stayed in for sex since summer, but I figured going out might be nice.

“If you’re not feeling bad, wanna go somewhere?”

“That sounds good. Let’s do it.”

Surprisingly eager, we finished breakfast and decided where to go. We’re not into karaoke or bowling, it’s too hot for parks or zoos, we just went to the aquarium, and I’ve been to the amusement park twice recently. A love hotel’s no different from home, but Miyu loves shopping, so we settled on visiting the station bookstore to find travel guides.

I changed first and waited in the living room. Fifteen minutes later, Miyu appeared. Post-summer, her wardrobe shifted to autumnal checkered skirts and white-based outfits, with light makeup. She looks more mature each time she dresses up, but she says she picks sweeter styles for me—like the checkered skirt to evoke a “uniform date” vibe. My sister gets my otaku tastes.

After confirming we had our wallets, we left the house. Lately, Miyu’s been curling her hair, but today she straightened it, giving her a more refined look as we headed out. Walking through the residential area to the main road, we took a bus to the familiar station department store. Under the bright indoor lights reflecting off the white floor, we walked close enough for our sibling intimacy to be noticeable.

(Should I hold her hand…?)

Dodging people, our hands brushed and parted like nervous new lovers. As siblings, we don’t need to act overly couple-like, but if it were Yamamoto-san, I’d probably have my arm around her. It made me want to try some public affection with Miyu. Maybe if we go somewhere far someday, I’ll give it a shot.

We reached the bookstore entrance and stopped at the travel magazine section. The area, once filled with blue ocean-themed covers, was now a calm brown tone.

“Is it time for autumn leaves?”

“Depends on the place, but probably a bit early. I’m not big on open-air baths in cold weather, so last year I went to a hot spring while it was still warm. A café terrace reachable by ropeway was nice too,” Miyu said, flipping through a magazine, eyes down.

(A hot spring, huh? We did a day trip last time. Staying at a ryokan sounds good.)

While thinking this, I peeked at her magazine. When our eyes met briefly, she looked back at the pages, blushing.

“You’ve been avoiding my eyes.”

“R-Really?”

She tucked her hair behind her ear, hiding her expression to mask her thoughts. In her outdoor cool mode, she’s supposed to be 90% rational, but her shy smile screamed lovey-dovey mode. I’ll have to grill her about this at home.

“Some ryokans have private open-air baths, right?”

“Yeah, big wooden tubs on balconies with flowing hot water.”

“Nice.”

We flipped to a page featuring rooms with private baths. Resorts are pricey, but some ryokans offer great vibes for around 10,000 yen. Unlike Yamamoto-san, Miyu’s not up for sex anywhere, but a private bath might work.

“You’re thinking dirty stuff, aren’t you?”

“Caught me.”

I wasn’t hiding it. But seeing Miyu occasionally get in an erotic mood while staying rational makes me think.

“Don’t you want to try it too?”

In the off-season, with fewer people around, we stood close, talking. Instead of nodding, she glared at me with a flushed pout, then looked back at the magazine.

“Well, yeah.”

Wait, she admitted it? I expected a snarky comeback, but this feels like her signaling a new desire to explore.

“If there’s sex you want to try, just tell me. I’d happily go along with anything, even if it’s a bit kinky.”

“I trust you completely on that, but… um…”

Flipping unread pages, she wrestled with her embarrassment before continuing with a softened expression.

“I kinda like it when you beg me for sex, and I end up giving in…”

She whispered her honest fetish. For a cute sister who loves being used for sex—by her brother only—she enjoys the dynamic of reluctantly giving in after being pushed. I’ll try to understand.

“My only worry is whether you can keep your voice down outside.”

Mom did warn us about the noise.

“If I’m too loud, you can dunk my head in the water.”

She hid her face behind the magazine. That’d kill you!

“Or maybe gag me with a towel. Worst case, I could just… service you with my mouth.”

“You’re pretty into this.”

Since she brought up hot springs, my request for a private bath might’ve been her plan all along. I’m thrilled she’s getting honest about her desires.

“Just to confirm, you’d only do it in a ryokan or hotel, right?”

“Yeah. I want thrilling experiences with you, but I don’t want other guys seeing me during sex.”

“Got it.”

Beyond the shame of being seen, Miyu hates showing her body to other men. She’s even refused handshakes, so no matter how sexual we get, I need to respect that.

“Kanade-san would probably strip and have sex in the mountains if no one’s around.”

“Can’t deny that.”

She’d do anything to please her man. No one, not even Miyu, can match that devotion.

“I’ll grab some ryokan and gourmet magazines for fall.”

Miyu picked a few from the shelf, paid, and returned with the bookstore’s logoed plastic bag on her arm. Her long hair and hoodie-stretched chest made her look adorable just blinking.

“W-What…?”

She averted her eyes and headed for the down escalator. Catching up, I got close—careful not to seem weird to others—and whispered in her ear. Her ears looked hot.

“Why do you keep looking away?”

My breath must’ve tickled her ear; she flinched, listening nervously.

“Well… yesterday and the day before, I was way too lovey-dovey with you…”

“Embarrassed thinking back?”

I figured as much. Her rational side must find that clingy affection unbearable.

But her answer surprised me. After one escalator, as we turned to the next, she met my eyes briefly, grabbed my hand, and pressed it to the top of her chest.

“It’s embarrassing, sure. My head’s clear now, but my body remembers those nights… Seeing your face makes my heart pound like crazy…”

I could feel her heartbeat through her thick chest. Despite her cool exterior, she’s been flustered every time our eyes meet. A cuter reason than I expected.

“So, when I look at you, I’m scared I’ll turn back into that version of me.”

“What’s wrong with that?”

What’s wrong with a sister who loves and kisses me? Tell me.

“It’s a problem! Keep talking like that, and I’ll walk arm-in-arm, pressing my boobs against you.”

“That’d make me even happier.”

Though I teased back, Miyu only muttered “stupid Onii-chan” and didn’t go all out with public affection.

She kept blushing and grumbling as we grabbed a quick lunch at a burger shop on the way home. On the bus, sitting side by side, she propped her cheek on her hand, gazing out the window. Her fingers slid over the back of my hand—not quite holding it, but a subtle, teasing touch to sate her urges.

“…Wanna do it when we get home?”

I leaned in quietly. Still looking outside, she intertwined her fingers with mine, squeezing as her answer.

Her steps quickened as we walked home, urging me along. The brief hand-holding ended, and by the time we reached the house, we were both sweaty. But the moment we shut the front door, alone at last, Miyu hugged me tightly without turning on the AC. Locking eyes, she tilted her chin, begging for a kiss, and we dove into a deep, eager embrace.

Mixing saliva, her body twitched as I tickled her palate. She exposed my cock, and I slid my hands under her skirt, into her panties, feeling a wet mix of sweat and arousal. Overwhelmed, she squirmed, trying to push my hand away as she couldn’t focus on stroking me. Unable to speak through the kiss, we read each other’s desires through our groping, heightening our lust. Pent up since yesterday, I couldn’t hold back. Reversing our positions, I pinned her against the door, lifted her leg, and entered her lower mouth while still kissing.

Ignoring dirtying our clothes, we stayed pressed together, sweating. Her tongue froze as I entered. Sucking her lips from the base, I thrust face-to-face, her muffled moans echoing in her throat. Standing on one leg, she leaned against the door; my erection held her steady.

While our lower halves moved fiercely, we shed tops between kisses, leaving pants and skirt half-down. Her sweaty breasts slid against my chest, her hardened nipples grazing me.

Her face melted under my rough thrusts. Having learned to climax by wriggling her vagina while suppressing spasms, she came countless times. Her juices dripped down my thighs, and without warning, still kissing, I came inside her.

I paused at the moment of release, letting her feel my cock pulse—doku, doku—widening her vagina, then resumed thrusting to push the cum deeper.

One ejaculation doesn’t soften me anymore. Though she was exhausted, satisfying my lust is our priority, so we kept going.

But her muscles gave out. My cock slipped from her vagina, white cum dripping onto the tile floor. I stripped off my pants, removed her skirt, laid her on the step, and pounded into her spread legs like an animal. She tried to speak, but I sealed her mouth with a kiss. Her uncontrollable spasms and near-rolling eyes showed she was cumming non-stop. Her disheveled state drove me wild, sweat splattering the floor as I neared climax. Rubbing her vaginal walls to the limit, I unleashed a forceful ejaculation, filling her womb.

After two rounds, my lust finally calmed. Released from the kiss and hold, Miyu lay drenched, hair wet, naked except for shoes, cum leaking from her slit. I steadied my breathing, locked the forgotten door, picked up her clothes and bag, and noticed her phone. Secretly snapping a post-sex photo with it, I headed to run a bath.

When I returned, Miyu was sitting up, legs folded, still leaking cum. Brushing sweaty bangs aside, she puffed her cheeks, flushed.

“Was two times too much?”

“No, it’s not that…”

She fidgeted, not too angry.

“Oh, the clothes… No cum on them, but they’re sweaty.”

“I’m used to that now.”

Clothed sex is apparently fine. So what’s the issue? She spoke up.

“I said I’d drink it…”

Right, she promised to drink all my cum when she recovered, but I just kept creampying her without a blowjob, and she’s annoyed.

“You were horny too, right? Thought you wanted it inside, so I went for it.”

“That’s not wrong, but… I liked the idea of holding back and pleasing you with my mouth…”

True, Miyu loves the act of sex itself—being the one doing it. Unlike Yamamoto-san, she doesn’t always seek direct pleasure. Her love for masturbation means she can satisfy herself if needed. As long as it’s not constant, she’s fine without full-on sex.

“But your sex has gotten so good,” she said, blushing happily. The cum must be kicking in.

“That good?”

“Yeah. Getting creampied while my mouth’s sealed? Insanely hot and feels amazing.”

“Guess it hit your sweet spot without meaning to.”

Her rape-like fantasy—exclusive to me—means being kissed and used unilaterally is pure bliss for her now.

Helping her stand, she headed to the bath while I cleaned the floor. She showered, and as the tub filled, I joined her in the cramped bathroom.

“We’re really close, huh?”

“Yeah.”

Sex alone doesn’t measure our bond; everyday intimacy like this does.

“Hehe, I love bathing with you.”

She turned, sitting between my knees, and gave a soft kiss. Holding back outside made her extra lovey.

“If you love me that much, maybe I could lick you down there?”