While Taking Care of My Shut-In Little Sister, I Somehow Ended Up Ejaculating Inside a Beautiful Girl - Chapter 34: A Nighttime Stroll Leads to Encountering a Beautiful Girl’s True Nature

Chapter 34: A Nighttime Stroll Leads to Encountering a Beautiful Girl’s True Nature

Rattling along on the train home, Yuu and I sat side by side, pressed close together, just like on the way there.

It’s 7:30 p.m. The sky outside is completely dark, and the train windows reflect the bright interior instead of showing the black scenery beyond.

Through the reflection, I catch Yuu’s grinning face as she clings to my arm.

Our eyes meet in the glass, and a question pops into my head.

“Yuu.”

“Hm?”

“How was talking with Masami-san?”

“Pretty normal. She’s worried about being single forever, but she’s so laid-back about it. I ended up saying a few things myself, though…”

Looking directly at her instead of the reflection, I see her eyes soften as she fondly squeezes my bicep with her left hand.

“Did you two fight?”

“No way. We’re not kids.”

“My bad.”

Honestly, the only reason I can imagine them fighting is Yuu’s overactive imagination.

“Ren-chan? Thinking something weird?”

“Nope, nothing.”

She’s sharp. How does she always know what’s on my mind?

“Glad you two got along.”

“Oh? Ren-chan, you playing Masami-san’s guardian now?”

“Not at all.”

But I had a reason for bringing them together today.

My meeting with Masami-san was pure chance, but she still feels deeply indebted to me. I’ve been helping with her work, getting paid in return—a bit sleazy, I admit. But since she started showing signs of emotional dependence, I knew I had to do something.

Now that Yuu and I are officially together, I decided to come clean about my connection with Masami-san.

I figured Masami-san could use Yuu’s straightforwardness and energy.

And Yuu could benefit from Masami-san’s seasoned, adult perspective.

I thought they’d be good for each other.

Plus, I’ve been hiding this “unusual” connection from everyone. It wasn’t a big deal if it got out, but as a high schooler, having this kind of “connection” or “secret” felt like something I could use as leverage someday.

The benefits of keeping it hidden were minimal compared to the advantages of revealing it now. That’s all there is to it.

Learning Masami-san was Yuu’s aunt after we got involved, and ending up as her “errand boy” visiting her company weekly, was unexpected, though…

“What did you and Masami-san talk about?”

“Lots of stuff. We talked a ton.”

“Can I hear specifics?”

“Ugh, it wasn’t anything major. Like, life philosophy or something?”

“That sounds pretty major to me…”

Still, if Yuu said what she wanted and parted with Masami-san on good terms, my plan worked out, right?

“That amount of money… You sure you don’t want it, Ren-chan?”

“Don’t be dumb. You’re the one who took it, right? I got my own share. If you, her relative, pass it to me, it just complicates things.”

“Is that okay…? Really okay?”

“Yeah. Take what you’re given. She probably just feels good giving her niece pocket money.”

“Pocket money…”

Yuu rests a hand on the shoulder bag on her lap, pressing down slightly.

“Hey, Ren-chan…”

“What?”

She pauses, thinking, then murmurs softly.

“Rich people are wild…”

“…Yeah, I guess…?”

The longer you’ve suffered without money, the more you appreciate it.

Unlike me, who grew up strapped for cash, Yuu comes from a comfortable family. Seeing her marvel at money’s value surprises me, and I tilt my head.

“Don’t you get allowance from your parents?”

“Uh, yeah…”

She doesn’t seem like she needs a job for money—her talk of working was always about “gaining experience,” and she’s never actually started one.

“Wanted something expensive?”

“No way! Not at all!”

“Okay, okay, no need to deny it so hard…”

I hit a nerve, but she clearly doesn’t want to talk about what she’d spend it on, so I let it go.

“What about you, Ren-chan? Want anything?”

“Me?”

“Yeah. You’re kinda into saving money, right?”

“Like I’m some miser.”

“Didn’t mean it like that… But you’re the opposite of a big spender, aren’t you?”

“Hmm…”

I don’t think I’m cheap, but I do lean toward saving.

Something I want… huh.

Lost in thought, the time to our stop flies by.

*

“See you tomorrow.”

“Yup, tomorrow! ♥”

We part at our front doors.

She heads to her house, I head to mine.

It’s almost 8 p.m., and the neighborhood is dark, no sign of rushing salarymen.

“Best weekend ever! ♥”

As I unlock my door, Yuu’s voice rings out as she opens hers.

I’m not sure if she meant for me to hear or if it was unconscious. It wasn’t loud, but clear enough to reach me.

“Wel—”

“I’m home! ♪”

“…”

It’s not Yuu’s fault, but her cheerful greeting makes mine catch in my throat.

I repeat, it’s not her fault.

But for some reason, I can’t say “I’m home” right now.

Compared to her lively “I’m home,” mine feels hollow, superficial.

Why do I usually say this empty phrase without thinking?

It’s a habit, something I say on autopilot.

But now, it’s bugging me for no reason.

“…”

I touch my mouth, pointless as it is.

What is this feeling?

I don’t even know why I’m so uneasy.

“…The lights are… on, right?”

Stepping back, I check the second floor from outside.

Light leaks through Shiori’s curtains, showing she’s still up.

“…”

I lock the front door quickly.

It might’ve been unconscious.

I opened it, then locked it again.

What am I doing?

What the hell am I doing?

Turning on my heel, I walk away from the house.

Facing away, my feet start moving somewhere.

What am I doing?

Seriously, what am I doing?

Get back home.

The chores?

Shiori’s safety?

Make any excuse.

There’s still time.

Turn back—

Ignore that feeling and live your normal life like always—

*

The park. One of the small rest spots scattered around town.

I sit on one of two swings, creaking as I sway.

There’s just a slide and swings here, plus a small open area and a public restroom.

The park’s empty at night, save for a few bugs buzzing around the streetlamp.

Spring’s here, I think. Summer’s coming next.

More bugs, heat making outdoor stuff a hassle—I think vaguely.

Maybe I’ll plan a part-time job for the long break when I get home.

School starts again tomorrow.

Keeping up with classes is a pain. Maybe I’ll switch to self-study during lessons, go at my own pace.

Random thoughts keep popping up.

“…Bored.”

I’m so bored.

I came to the park for a change of pace or something, but it’s not doing much.

“…”

I glance around for the umpteenth time.

Still no one.

…Or so I thought.

“Ren-chan, that’s dangerous! Being alone out here like this~♪”

A cheerful voice.

A quiet call of my name in the night park.

“…”

Without turning around, I stay seated on the swing, waiting blankly.

The person who called me sits on the swing next to mine.

“Yakko-chan, you’re the one who shouldn’t be out alone at night. It’s dangerous for a girl.”

“Aww, you’re worried about me?~♡”

“Of course.”

Yakko Tsukimi.

Her smile is different from her usual smirk.

No, everything about her feels… off.

Right now, she’s…

Wearing a black blouse and white flare skirt—exactly the same outfit as someone from yesterday or today.

Her voice is sweet, almost seductive.

Her dyed blonde hair, usually in a two-side-up style, is now straight.

She narrows her eyes, giving me a fond, affectionate smile.

“Looks like you followed me here alone.”

“Nuh-uh~ I was just heading to the convenience store and happened to spot your back, so I followed!~♡”

“Have you, maybe, followed someone else a few times before?”

“No way~ Why would I follow anyone but you, Ren-chan?~♡”

She casually admits to tailing me.

—Where’s the line between her lies and truth?

Where’s the truth, and where do the lies start?

“Your head’s all filled with thoughts of me right now…~♡”

“…”

Building genuine trust with her feels like an exhausting task.

And now, that dynamic is shifting into something strange.

Our relationship—how is it changing? It’s like being blindfolded and asked to guess heads or tails on a coin flipped multiple times. I feel the distance between us, impossible to gauge, with my whole body.

“So? How’s my look?~♡”

“…”

Still on the swing, Yakko looks at me, fishing for compliments.

She’s trying to force her way into my thoughts, hitting hard from the start.

“Does it suit me?~♡”

“…”

If I’m honest, it does suit her.

The outfit—Yuu’s style—matches Yakko terrifyingly well.

It’s not just that it looks as good as it did on Yuu; it’s that Yuu’s fashion sense is so spot-on it fits both their vibes perfectly. That’s the real shock.

Yuu’s ideal proportions, Yakko’s slender frame—hats off to a style that works for both. Their great figures and the designer’s taste—

“Looks like you like it!~♡”

“…”

No surprise there.

It’s the same outfit Yuu wore the day we got together. Yesterday, before we had sex at home, she was wearing it.

It’s only natural that the memory and “good impression” are burned into me at an instinctual level.

And now, of all people, Yakko is wearing it.

Her silhouette could almost pass for Yuu’s.

“If you’ve got something to say, just say it.”

I give in, ready to hear her out, though I probably won’t go along with it.

“Have sex with me and finish inside!~♡”

“Not happening.”

“Then just have sex with me!~♡”

“Also not happening.”

Same reason for both. The first is even less likely, for the record.

“You don’t find me attractive right now…?”

“That’s not the issue.”

“Then it’s fine!~♪”

“It’s not fine…”

Whatever Yakko’s true intentions or thoughts are, they’re hard to pin down.

This is the first time she’s felt this difficult to deal with.

Yakko’s mimicking Yuu almost perfectly—her tone, voice, expressions, gestures.

…Yuu’s actions come from love, at their core.

To think I’d come to understand Yuu’s “intensity,” the kind of “toughness” others see in her, through Yakko like this.

As I’m caught in the strange comfort of realizing Yuu’s strength…

“Thinking about Yuu-chan?”

“Nope.”

“Hmm…”

Yakko narrows her eyes. Her face smiles, but her eyes don’t.

There’s a certain intensity in a beautiful girl’s expression like that, but Yakko’s got a new kind of edge I’ve never felt before.

“Wanna come to my place?~”

“No.”

“But you haven’t eaten dinner yet, right?”

“How do you know?”

“I just know.”

“…”

I felt danger.

No, I’m feeling it right now, in real time.

…I need to put distance between me and Yakko, fast.

The supermarket’s closing soon. I should grab dinner for me and Shiori and head—

“Come to my place, right?~♡”

“…”

Why does it always come to that? I want to yell.

“I’ve been practicing cooking!~♡”

“Oh?”

Yakko cooking…?

I won’t play dumb about what’s behind it, but I’m genuinely intrigued. Learning life skills, whatever the reason, is a good thing.

“You like girls who can cook, don’t you, Ren-chan?~♡”

“I won’t deny it.”

A girl who’s good at cooking? Yeah, that’s nice.

“Any other qualities you look for in a girl?”

“Not really.”

“Huh? Hiding something…? Got a long list of dealbreakers or what?”

“Nope.”

I’m not picky.

I just happen to have an amazing girlfriend, Yuu Onodera. She happens to like me and sticks by my side.

If she’s bad at something, I don’t mind—I want to support her.

Even if I can’t help, if I’m lacking, I’d blame myself, not her.

“Cooking’s not a must-have. Yuu just happens to be super into food, and her skills more than make up for my shortcomings. That’s all.”

“Ohh, got it. Your cooking’s kinda bad, huh?”

“…”

Yakko doesn’t hold back with her jabs.

But it’s not like I care. What’s weird is that I don’t care when she points stuff like that out.

Normally, you’d be a bit hurt, right?

“Conversation over? I’m head—”

“—Oh!~♡ Ren-chan, you smell a bit like sweat…~♡”

As I start to get up from the swing, Yakko sniffs the air, stopping me.

No way. Do I smell…?

“I was at the gym. I showered after, but… do I stink?”

“Nuh-uh!~♡ Smells nice!~♡”

“Good…”

We’re on adjacent swings—not too close, not too far. A few dozen centimeters. Could her nose really pick up my scent? Or am I overthinking?

It’s the end of the day. A bit of sweat isn’t unusual. Most people sweat a little, right?

“Did you know? Being okay with someone’s scent means you’re genetically compatible!~♡”

“…”

“Hey, Ren-chan, did you know that?~♡”

“Heard it before.”

“Right?~♡ I bet you and I are super genetically compatible!~♡”

“Hmm…”

Yakko’s being pretty direct with her “affection” (if you can call it that).

Her approach feels so much like Yuu’s it’s throwing me off.

That aggressive pushiness…

Not hiding her feelings, flaunting compatibility, closing the distance fast—it’s like she’s copying Yuu perfectly.

So, what now…?

“Hmm…”

As I’m figuring out how to respond or end this, a creak sounds, and the swing sways hard.

“Yup!”

Yakko hops off her swing and steps in front of me.

“…”

“…What?”

Me, sitting on the swing. Yakko, standing with a plastered smile.

We face each other.

My gaze looking up, hers looking down.

All I feel from her is an indescribable pressure.

“Don’t move.”

“Huh? Why?”

“If you move, I’ll tell everyone you assaulted me.”

“Please don’t.”

Yakko said something terrifying in a calm voice.

Anything but that. It’d kill me.

Socially.

“No recording or video, so… here I go—”

“Huh? Wait—what!?”

And then, she sits on my lap, facing me, straddling my knees while I’m still on the swing—

“Hey! What the hell are you doing!?”

“Ehehe~♡”

We’re in a face-to-face sitting position.

Her slender knees rest on mine.

She’s light. Probably lighter than Yuu.

Is she even eating properly…?

I worry about Yuu’s weight sometimes, but girls are so light…

“Hey, come on! Get off, please.”

“Oh~♡ If you touch me, I might scream~♡”

“Scream all you want, just get off—”

“If you try to push me off, I’ll yell that you’re assaulting me~♡”

“Ugh…”

This is the worst.

Yakko flashes a devilishly beautiful smile, laughing gleefully.

“What do you want?”

“Come to my place like this, right?”

“What if I say no?”

“Huh? You wanna do it here…?”

She tilts her head, looking puzzled.

Why does it always come to that?

Her misunderstanding is obviously about outdoor sex—public indecency.

Who’d do that?

“I’m not doing it. Not happening.”

“Then at my place, right?”

“No ‘then.’ I’m not doing it.”

Is she really not letting me go?

Is she that serious?

“Haha!☆ What, Ren-chan, you saving yourself for Yuu-chan or something?”

“We’re dating. Of course.”

“It’s fine, just once.”

“No way.”

Her ethics are insane. This pushiness isn’t normal.

“You really don’t wanna do it with me?”

“Nope.”

I say it with firm resolve.

Firm… yeah, hard resolve.

…Sometimes, a guy’s body has unavoidable reactions.

Let’s just say that.

Lately, I’ve had trouble getting it up, so minor stimulation doesn’t do much.

“Eh?~♡ Your thing doesn’t seem to agree~♡”

“…Stop it.”

Yakko gleefully grinds her crotch against mine.

“—Tch!”

“Ufufu~♡”

But my ED—erectile dysfunction—means her grinding shouldn’t affect me much.

…Or so I thought.

Something’s happening right now that I didn’t expect.

Her stimulation is intense.

“Look~♡ Look at that~♡”

She sways her hips, grinding her crotch against my penis.

Her breasts are smaller than hers, her dyed blonde hair a different color, shorter too.

But her provocative pose, voice, expression, movements—

They hit a very recent memory in me.

The irresistible pleasure makes my erection grow harder.

“Hyah!?~♡”

My arched, bulging erection—specifically the sensitive underside—seems to hit a sensitive spot on her through the fabric.

“Nn~♡ Ah~♡ …Haah~♡ This could get addictive…~♡”

“…Can you, uh, stop…?”

“Rub rub~♡”

Grind, grind, grind.

Her crotch rubs against my penis through layers of fabric.

For a while.

Relentlessly.

Over and over.

“Rub rub!~♡ How’s that?~♡ Rub rub rub~♡”

She teases with a playful voice and gaze, smiling up close.

—Her image overlaps with Yuu in heat from my memories.

“Ah~♡”

Yakko lets out a gleeful cry, her eyes fixed on my crotch.

Twitch, swell.

My erection grows even more.

“Stop… how long are you gonna keep this up… get off.”

“Until you wanna do it?~”

“I can’t, seriously…!”

Her grinding feels unexpectedly good, and I can tell my penis is leaking a bit of precum.

Her white flare skirt hides her crotch, but I feel a distinct dampness—not mine—radiating from her.

The sensation of my wet tip rubbing against her wet slit through the fabric.

“Nn…~♡ Haha~♡ Hahahaha~♡”

Yakko laughs, her voice almost sultry.

God…

Our positions are totally different, but I see Yuu—naked, shameless, spreading her slit, swaying her hips seductively, flashing back in my mind.

“—Tch!”

Recalling that moment with Yuu, my penis hardens even more.

That decadent day is burned into my brain, my body.

Her warmth, the mix of our sweat and fluids, the smell—it all plays back, stirring me to my core.

…Am I doomed to get rock-hard recalling Yuu’s lust every time something erotic happens? What a dystopian thought.

“Haha!~♡ Ren-chan, you look pathetic!~♡”

“—W-We’re outside! Someone—a passerby—could see!”

“Let ‘em see!~♡”

“What are you saying…!?”

This is bad. She’s not listening.

But it’s not like she’s lost her senses—more like…

“Alright, fine! I’ll go to your place! Just stop doing that crazy stuff!”

“…Haha!☆ Yes!~♡”

Her reckless, forceful approach, heedless of consequences or surroundings.

Faced with her calculated aggression, I had no choice but to give in.

“Deal sealed!☆”

“…Hff…”

When I reluctantly agreed to her invitation, Yakko finally got off my lap.

“That felt good, huh?~♡ How was my grinding?~♡”

“It was so tense and confusing I thought I’d lose my mind!”

“So it did feel good?”

“…”

Damn it.

My erection’s starting to calm down, but—something’s off. It feels like I got hard faster than usual.

Is my penis, which was struggling with ED, actually… recovering?

—Wait a second! That’s probably because of Yuu, isn’t it!?

Her healing my heart, right!?

Where’s my gratitude for her!?

Come on, little guy, get it together!

“Ugh…”

Even though it was Yuu’s lust in my head, getting hard from another girl’s stimulation makes me feel like I cheated—an inescapable despair.

…Knowing Yuu’s personality, this would definitely count as cheating in her book.

Even if my social life was held hostage, the guilt doesn’t fade.

I just want to go home…

…But I can’t exactly leave.

“Ehehe~♡ Tonight, I’ll make you forget all about Yuu-chan!~♡”

“…”

Yakko grabs my hand, yanking me up from the swing, and starts walking, clinging to my arm.

I drag my feet, reluctantly following her pull.

“School starts again tomorrow… it’s a weekday…”

“Who cares?~♪ Starting tomorrow, you’re skipping school with me!~☆ It’s decided!~♡”

“Starting tomorrow!? Sorry, I’m going home—”

“No way!~♡ Try anything weird, and I’ll scream right now!~♡”

“…”

She throws out threats, completely ignoring my situation.

Alright…

“So, tonight, you’re cooking dinner for me, right, Yakko-chan?”

“I’m still practicing, so taste-test for me, okay?~♡”

“…Got it.”

If we move to her place, her control over me weakens.

No one’s likely to rush over if she screams nonsense there.

I can reject her demands freely, meaning I don’t have to get physical with her.

But stepping into her territory carries its own risks.

Even if it’s not true, what she might tell others later is a problem. It could damage my trust with Yuu.

There are ways to avoid the worst-case scenario, but whether I can pull them off is another question.

If Yakko’s really tracking my every move—knowing my habits so well—she might predict my next steps.

—And maybe that’s why I thought it.

“Hand over your phone.”

“…”

“Now.”

As if reading my mind, Yakko issues the worst possible command as I reach for my pocket.

“I’m not doing anything.”

“You think I’ll just believe that? Hand it over, liar Ren-chan~♡”

“…”

I pull my phone from my pocket and hand it to her.

“No sneaky recordings or calls with someone. That’s a good impression!~♡ If you’d done that, I’d have screamed for sure~♡”

“…”

Her carefree smile.

It’s not her emotions—her behavioral brakes are a bit broken.

That’s confirmed now.

“Just so you know, the cooking practice, this outfit—it’s all for you, Ren-chan~♡ I want you to get that~♡”

“…Yeah.”

For me… huh.

Not exactly a line that makes me happy.

“Lately, you’ve been showing up at my house at weird times, catching me when I’m out, like now. That’s all for me too?”

“Yup!~♡ I’m keeping tabs on you, understanding you, supporting you~♡ Managing your schedule is just what a girlfriend does~♡”

“Girlfriend? Hold on, is that some kind of joke?”

“Nope!~♡ I mean, who else gets your situation and empathizes like I do?~♡ I bet I’d be a way better partner than Yuu-chan in the long run~♡”

“…”

Come to think of it, lately she’s been weirdly good at knowing my moves, timing her run-ins with me.

—No.

Enough playing dumb with “somehow.”

No more pretending I haven’t noticed.

Knowing my schedule alone wouldn’t let her catch me like this.

She’d have to track my movements, my location, constantly.

I don’t live a life so predictable that a simple schedule would give me away.

—That’s right, no doubt about it.

Yakko Tsukimi—Usotsuki-chan—is a stalker.

“Wait a sec!”

““—!!””

Yakko and I jump at the voice.

It’s so familiar, so recognizable, that I turn around in shock.

“Hah… hah… What are you planning to do with Ren-chan, Tsuki-chan…!?”

There, panting heavily, skirt disheveled, glaring at us with fierce eyes, is a beautiful girl.

My real girlfriend—Yuu Onodera.

“Yuu! Perfect timing!”

“Yuu-chan, worst timing.”

My voice and Yakko’s, opposite in meaning and feeling, overlap.