While Taking Care of My Shut-In Little Sister, I Somehow Ended Up Ejaculating Inside a Beautiful Girl

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Chapter 57: A Certain Important Issue Regarding “Scent”

“Have you ever seen Shiori-chan as a woman?”

“Huh???”

I was utterly confused.

Yuu’s sudden question threw me into a tailspin, my eyes darting as I scrambled for an answer.

“No, my sister’s just my sister. Nothing more, nothing less. Obviously.”

“…”

I couldn’t tell if my answer satisfied her or not.

Yuu, frozen mid-motion while putting away the hairdryer, stared at me.

Her expressionless face, those deep, abyssal black eyes boring into me.

“Why’d you even ask that?”

“…”

Instead of answering, I pressed her on why she’d brought it up, but she clammed up.

This shift in her behavior. She wasn’t likely to reveal her true intentions, but observing closely, I started to piece things together.

Her dilated pupils, fixed on me with infrequent blinks, were a sign she was studying me. Gathering detailed info about me. Her focus was on me or things related to me, above all else.

I haven’t done anything particularly noteworthy, and even if I had, Yuu’s always been there. Her worries must stem from the context of events or my inner thoughts.

The most recent clue likely ties to when we officially became a couple—something around that.

But what really stands out is her unease mentioning Shiori’s name.

I’ve tried to address Yuu’s anxieties one by one, but now, at this stage, a massive problem has surfaced. No matter how much I comb through my memories, I can’t pinpoint why she’s acting this way.

Something about me and my sister, Shiori, huh?

Ugh, I don’t get it.

Since Shiori became a shut-in, our relationship hasn’t changed at all, practically speaking.

“…Shiori-chan moves around the house pretty actively, doesn’t she?”

“Does she? Wait, you’ve seen her?”

“…No.”

Yuu shook her head weakly, as if she had some inkling but wasn’t sure.

Saying she knows Shiori’s movements without seeing her is odd—something she’d normally notice. Or maybe… never mind, not now.

Unfortunately, I haven’t caught Shiori outside her room in years. I’m jealous Yuu knows anything about her movements, and I’ve got questions for her too.

“Yuu, c’mon, get in.”

I put away the dryer, lay on the bed, and invited her into the blankets.

“Ren-chan…”

Her expression was complex, but she slipped into the covers anyway.

“What’s with that face? Can’t sleep now?”

I teased, but if she really couldn’t, that’d be a problem. My insomnia’s been easing thanks to her, so her developing it would be bad. I don’t have anything to offer her like she does for me.

If my girlfriend got insomnia…

Recommending a doctor or meds is all I can think of, so I should look into other ways to help, just in case.

“Ren-chan…”

“Hm?”

Yuu snuggled closer in the blankets, murmuring against my chest.

Her long hair was slightly messy, so I gently smoothed it out.

“…Never mind.”

“…?”

Our body heat quickly warmed the blankets.

I opened a gap to let some heat escape.

“Something happen… with Shiori?”

“…”

Yuu’s body tensed slightly.

I pulled her closer, sharing my warmth. Sleep needs a temperature drop—warming her now helps her drift off later. Nothing drastic like a sauna-to-cold-plunge; gentle changes are key.

“Can’t… tell me?”

“…!!”

She buried her face in my chest, hiding her expression, but that only made it clearer.

I don’t know what happened between her and Shiori, but something did.

That’s progress enough for now. I decided to drop it.

“It’s okay, don’t worry. You don’t have to do anything.”

I smiled as warmly as I could to reassure her.

“…!? R-Ren-chan…!?”

But Yuu looked at my face—my eyes—and seemed almost scared.

What’s got her so startled? I don’t know, but it stings a bit.

Or maybe she’s the one hurt. I quickly added,

“Just leave Shiori to me. As long as she’s willing to listen, it’ll be fine.”

“Ren-chan…”

Her eyes narrowed with a pained look as she brought her half-open lips closer.

…What? A love check now? Odd timing, but I leaned in and kissed her.

“Mmph—♥”

Soft lips met mine, and within moments, our tongues slid against each other in a deep, messy kiss. Our tongues danced like overzealous traffic controllers.

Within seconds, Yuu’s face melted into a blissful expression, her reaction so automatic it was almost comical. Not that I’m surprised anymore.

For us, deep kisses are routine, but it’s a shame this won’t lead to sex. My heart feels calm, fulfilled, with a hint of excitement, but my “little guy” just lazes between my thighs.

Wake up, buddy… come on, rise…

Even the great father god’s call goes ignored. How disrespectful.

Please, just get up. No luck, huh?

“Mmph—♥ Mmm, chu♥ —Nnh♥”

Yuu writhed sensually in the blankets, her body twisting enticingly.

I should be aroused by her unseen allure, right?

And then—twitch—my “little guy” stirred slightly.

Could it be!? But no, no full erection. Wouldn’t it be nice if it fixed itself in a day or two?

He perked up briefly, then slumped back, like, “Just a dream…” and went back to sleep.

Stop it. Don’t pull that weekday-morning-snooze nonsense now. It’s time to rise. Oversleep and regret it, I swear.

Deep down, I knew better, but with hope dangling before me, the letdown hits harder.

How’d it come to this? Even Shiori wouldn’t think her joke caused my impotence.

I know her words weren’t serious.

She doesn’t talk to me directly anymore, but she communicates through notes, so she must still care about me deep down.

“…”

“Mwah…?♥♥”

Pausing the kiss for a breather, a thin thread of saliva bridged our lips, as usual.

It broke quickly, but Yuu, interrupted mid-kiss, drooled from her slack, blissful mouth.

I wiped it with the back of my finger.

“…Mmm♥♥”

“Oh.”

Pop—she reflexively sucked my index finger into her mouth, like a fish snapping at bait.

“…Hehehe♥♥♥”

Eyes closed, she happily sucked my finger, basking in it.

Her face, a bit sloppier than usual, still held a cute smile.

Her unexpected, joyful, almost comical action made me chuckle.

It’s perverse yet innocently affectionate.

Like watching a kid delight in candy, it stirred an odd feeling in me.

“…Hehe.”

“—!!”

Oh. My laugh snapped her back to reality.

Her eyes shot open, her face screaming “Oh no!” as she froze, then yanked my finger out, blushing and looking down.

Like a kid embarrassed by a mess, she rubbed my saliva-coated finger with her pajama sleeve.

I vaguely recall hearing about this kind of “play” somewhere.

It didn’t exactly turn me on, but…

Watching her lick my finger sparked something—conquest? Protection? Some guilty, itchy feeling.

It’s less about physical pleasure and more about emotional bonding.

If you studied love academically, reactions to this kind of touch might sort people into categories. Or maybe it’s just personal taste.

“…N-No, it’s not like that!”

“What’s ‘not like that’?”

“~~~~!!!!”

Caught off guard by her own actions, she wouldn’t meet my eyes, mumbling into my chest, embarrassed. Maybe I teased her too much.

She took a few shallow breaths, then spoke softly, dejected.

“S-Sorry…”

“Hm?”

“Ugh… I got your finger all sticky… sorry…”

She grabbed my index finger again, wiping it furiously with her sleeve.

It hit me—she’s always been diligent about cleaning up after herself, even as a kid. My cheeks softened at the memory.

“—N-No, I mean, it’s not that! I just couldn’t help it when you put your finger near my mouth—!”

“…”

The softer my expression, the more she panicked, digging herself deeper. Her flustered excuses were adorable. I combed her hair gently, then kissed her forehead.

“Ah—”

She froze, eyes wide, mouth agape.

Her long lashes fluttered, her black eyes glinting.

“Yuu. You’re cute.”

“~~~~~~~~!?!?!?!?”

My spontaneous words made her face blaze red.

“N-No, ahhh…!”

Letting out a small, non-screaming cry, she covered her face with both hands and buried it in my chest again.

“—Ugh, Ren-chan… haa… I love you…♥♥♥”

Shaking her head in embarrassment but firmly saying “I love you,” her contradictory behavior revealed her intense turmoil.

“Haa… love you♥♥♥ So much… I love you♥♥♥ I’m going crazy… really… I’m losing it…♥♥♥ Snnnfff♥♥♥… haaaa♥♥♥”

Muttering suggestive lines, she started deep-breathing against my chest.

…Tonight’s events alone show Yuu’s got some perverse tendencies.

Sure, it’s a bit out of the ordinary, but there’s no malice or bad intent.

If her excessive affection comes from trusting me completely, that’s a good thing.

…That’s the positive spin, anyway.

“Snnff♥♥♥… haaa~♥♥♥… snnff snnff♥♥♥… haaa~♥♥♥ snnff snnff♥♥♥… haaa~♥♥♥”

“…Yuu?”

No denying it’s pretty kinky. She really loves sniffing, doesn’t she?

Fresh from the bath, we haven’t done much before bed. The only scents are probably our shampooed hair. Yuu picked a natural soap—milk-based—so there’s barely any lingering fragrance.

…Or maybe that’s why. A nagging “what if” creeps up.

“—Haaa♥♥♥ Ren-chan’s scent♥♥♥ Haa…♥♥♥ Haa…♥♥♥ Haa♥♥♥ Haa♥♥♥”

“…”

My scent?

…Wait, my body odor?

Do I really smell that bad!?

—

I mean, it’s something you don’t notice about yourself, so yeah, it’s unsettling…

“Do I really smell that much…?”

“I can tell!♥♥♥ I know!♥♥♥ Ren-chan’s scent is saying your dick’s gonna be back in action by the end of the week!♥♥♥”

“…”

The more I thought about her words, the more my face just… gave up.

Yuu’s spouting nonsense like some sketchy manga fortune-teller, with zero guarantee of accuracy.

Her nose is not reliable. Did my scent mess with her, or was she always like this?

…No, I know it’s a joke. Obviously.

But… some animals are super sensitive to changes in the opposite sex’s scent. It’s evolutionarily handy to gauge health or vitality.

—So, maybe.

Like how catnip’s scent is barely noticeable to humans, maybe Yuu’s picking up on some change in my scent that I—and everyone else—can’t detect. Maybe her nose, or some other organ, has a special receptor for it—

…Nah, no way.

I’m dumbfounded at myself for even entertaining the thought.

And while I was lost in that ridiculous train of thought…

“Snnff♥♥♥ Snnff♥♥♥ Haaa♥♥♥ Snnff♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Snnff♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Snnff♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Ren-chan…♥♥♥ Snnff♥♥♥ Snnff♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Ren-chan’s scent…♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Snnff♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Snnff♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Snnff♥♥♥ Haaa…♥♥♥ Haaa♥♥♥ Snnff♥♥♥ Snnff♥♥♥… Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥—”

Yuu was losing it.

“You’re sniffing me that much without getting bored…? Isn’t it, like, not something you do so openly?”

“Haaa♥♥♥ Haaa♥♥♥ Ren-chan’s scent♥♥♥… Nnh♥♥♥… Haaa♥♥♥… Haaa♥♥♥”

“Hey, Yuu—‘Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥’”

“Listen, Yuu—‘Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥’”

Is she… in heat?

She’s not listening at all.

“Hey, Yuu—‘Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Haaa♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥’”

“Yuu—‘Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥’”

…This is hopeless.

Her eyes were glassy, her face slack, lips half-open, chanting my name endlessly.

Longingly, desperately seeking.

…

Yuu’s gone off the deep end.

…Anyway.

Maybe I do smell.

Whether my body reeks or not—that’s not the issue.

I can’t tell myself, which is exactly why I’m anxious.

Maybe I need to start using long-lasting deodorant and perfume… I started seriously considering it.

“Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥”

“…”

Oh no… what do I do…

For now, I’ll wait for her to calm down—

“Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥”

“Hey, don’t touch my pants! Don’t try to strip me—oi, don’t take yours off either! Stop! We’ve got school tomorrow, we need to sleep! Hey!”

“Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥ Ren-chan♥♥♥”

“Where’s your brakes, your reason!? I said we’ve got school tomorrow!”

“—Mmph!?”

“Mmmchuuu♥♥♥♥”

In the end, we kissed until 2 a.m., lips drenched, skin pruned, for about an hour.

…The second half turned into a bizarre chicken race to see who’d stop first. With jaw fatigue and our minds growing hazy, we passed out like we’d fainted.

The next morning.

Sitting up in bed, I groggily recalled last night.

Maybe Yuu, in her own way, was trying to show that my impotence didn’t matter by going all-out with lovey-dovey stuff, helping me mentally recover.

I’d been trying to stabilize her emotions with physical closeness, but maybe she was healing me too—a convenient thought.

I don’t know how calculated her actions were, but I felt lighter somehow.

I can’t thank her enou—

“—Hm?”

Mid-stretch, full of gratitude, a yawn brought the wall clock into view.

A shocking time.

Only twenty-five minutes to get ready for school—a quarter of the usual time. A massive oversleep.

“Fwa… Ren-chan… morning~…♥…”

Sensing me awake, Yuu rubbed sleepy eyes and stirred.