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

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Chapter 21: When We Crossed That Line, Something Strange Happened to Her

As we left the hotel, the pale blue sky was starting to blend with shades of crimson.

“You sure you’re okay?”

“Totally fine, totally fine! ♥ Just a little nervous about walking ♥”

Yuu clung to my arm, looking up at me from close range with a goofy smile.

So cute.

…That said, though.

Even the few steps down from the hotel to the street had her waddling with her legs turned inward.

“Don’t push yourself. If anything feels off, tell me right away.”

“Thanks for worrying ♥ Walking’s no big deal, I think ♥”

“…”

She didn’t seem to be forcing it, but she was clearly aware of some discomfort, occasionally glancing at her crotch despite trying not to worry me. She couldn’t help but be conscious of it.

Maybe that’s why, even though her clothes were neat, her hair was still a bit messy.

Careful not to hurt her, I ran my fingers through her hair to tidy it.

“—Mmh! ♥”

Her glossy black hair flowed smoothly, and she shrank her neck slightly, ticklish.

By the way, I love the feel of her hair.

Her braid, gathered over her left shoulder, seemed to shift to a deep brown in the sunset’s glow. I love that color too.

As I combed through it, untangling the fine strands, her hair gradually regained its smooth, natural flow.

“—Mmh! ♥ Ren-chan, your hands are so naughty ♥♥”

“No way. I’m just touching your hair.”

Teasing her for being sensitive in weird ways, I finished tidying her hair and stopped.

“Aww ♥ Done already? ♥”

She squirmed, rubbing her thighs together—that gesture I’d seen all day. Now she was thinking about her crotch in that way.

“Hey, blow in my ear? ♥ Like, fwoo ♥”

“Huh?”

“Just a little, c’mon ♥”

“Do girls actually like it when guys do that…?”

In the end, her glitched-out energy won, and I gave in.

It was embarrassing, so my “fwoo” came out more like a short “fuh.”

“Kyaaah!? ♥”

“Whoa!”

Her back jolted, and I flinched in surprise too. Luckily, no one was around to see…

Can we not do this? Especially in the middle of the street?

“…Mmh! ♥ Ohhh… ♥ Ren-chan… even my ears… got developed… ♥”

“That sounds so wrong.”

Also, way too erotic.

“C’mon, let’s walk. You can walk, right?”

“Yup ♥”

“Want me to carry you?”

“Tempting, but I’ll pass for now ♥ I wanna stay glued to your side ♥”

“Fair enough.”

So she’s enjoying this moment, huh?

“But if walking gets tough, let’s skip the bus or train and take a taxi home.”

“No need~”

She answered quickly, almost panicked, blinking up at me with wide eyes.

“It’s gotta be rough taking a bus or train like this.”

I suggested it out of concern for her body, but it seemed to catch her off guard.

“If I said… I wanna walk a bit, would that be okay…?”

“Not a problem at all.”

“Ehehe ♥”

“Okay, then let’s take a taxi partway home.”

“Yup ♥ Sounds good ♥”

In the end, we took a taxi to the supermarket near home, then walked the rest of the way.

It’s a familiar route, not too long, so it shouldn’t strain Yuu’s body.

Just being here, with the cooler evening air, calmed the heat that had been blazing between us all day.

Dragging our slightly heavy, tired bodies, we walked the familiar path home.

Side by side, close together.

“It’s the usual way home, but… it feels kinda strange ♥”

“Yeah.”

The scenery—same as after school or a supermarket trip.

A narrow residential alley, barely wide enough for cars to pass.

The usual view.

But for some reason, it looked different today.

Not in a bad way.

Not lonely or melancholic.

…Nostalgic.

Nostalgic…?

Yeah, that’s it, something close to that feeling.

“…The view with you is my favorite, Yuu.”

“…Oh, really…?”

The words slipped out naturally.

I didn’t feel like taking them back or playing them off.

Feeling a comfortable ease, I meant every word.

What a strange sensation…

“Ren-chan, you really love me, don’t you?”

“Yeah.”

“…”

Yuu swallowed hard. The mood shifted slightly, and I looked at her.

She was looking at me too.

Yuu gazed up at me from my side.

Not anxious, exactly.

A wistful expression, maybe?

Her face seemed blank, yet her intense gaze felt like it was suppressing something, holding back, bottling up.

It carried a kind of instability.

Yet her deep, abyss-like black eyes held an unwavering, fierce light.

A light that didn’t fade but grew stronger.

“I love you, Ren-chan.”

Gone was her usual sloppy, lovesick grin.

“So much.”

Her voice was calm, quiet, repeating the words.

“Yuu…”

For a moment, I was at a loss for words.

What intense eyes. What a fragile voice. Such pure words.

And such deep feelings.

I want to live up to her. I truly felt that.

“I love you too, Yuu.”

“…Ehehe~ ♥♥♥”

…Well, as soon as I answered, her sloppy grin returned.

But just now, I swear I saw something raw in her wistful expression—a raw emotion.

Almost pained… or maybe on the verge of madness.

I can’t quite put it into words…

“Ren-chan’s hands are so big… ♥”

She was back to her usual self, her usual energy.

“Your hands are small, Yuu.”

“Wrap my tiny hands in your big, strong ones ♥”

“Sure thing. And you don’t need to make it sound so naughty.”

“Ehehe~ ♥”

Our hands clasped, fingers soon intertwining.

Just another cheesy couple moment.

We’d had fiery, intense contact earlier, but now, our clasped hands and tangled fingers carried a warmth—not burning, not cold, but a comforting, pleasant warmth.

“Take that! ♥”

“…!?”

Seizing a gap in my focus, Yuu brushed the back of her hand against my crotch.

Her hand hit the perfect spot (yep, the tip) through my pants, making my hips jerk back reflexively.

What a lame move…

“What’re you doing?”

“Hmm~ ♥ Just checking if Ren-chan’s down there is still working ♥ No worries needed~ ♥”

“Stop it. If you keep that up, it’ll actually get hard. That’s not funny.”

Me, hunched over in the middle of the street? I don’t even want to imagine it.

“…How about we do it outside? ♥♥♥”

“Are you serious? Your brakes—your reason—aren’t they completely shot?”

Her energy’s going way overboard. If Yuu goes wild, I’ll get dragged along and lose control too, so I’d rather keep things at normal lovey-dovey levels.

We’re almost home, and going home’s the only option now, but—

“If you’re into it, Ren-chan, you don’t have to hold back ♥ I’m your girlfriend ♥ If you want it, I’ll do any kind of play for you ♥”

“…So erotic…”

“What? ♥”

“No, nothing.”

Yuu Onodera is broken right now. She might’ve left her sanity back at the hotel.

My girlfriend is way too erotic.

“Ren-chan ♥ No pregnancy worries ♥ We can do anything you want ♥ Got anything you wanna try? ♥”

“I’ll pass for today.”

What a pathetic response.

“I keep saying, Yuu, don’t push it. I don’t have the guts—or the recklessness—for kinky stuff yet. Someone passing by might see us.”

“So it’s fine if no one’s around? ♥ Like now? ♥”

“That’s not the point—”

“♥ ♥ ♥ ♥ ♥ ♥”

Breathing short, shallow breaths, she looked up at me from close range.

Her perfect, bowl-shaped breasts pressed against my arm, squishing into a lewd shape.

The black blouse she bought today had a slightly wide neckline.

It highlighted her chest’s perfect shape, making it look even more erotic.

Her breathing, combined with that tactile sensation, was so vivid, so overwhelmingly erotic.

“♥ ♥ ♥ Ren! ♥ Chan! ♥ Ren-chaaan! ♥”

Her happy expression turned flushed, her cheeks red, her eyes filled with pure lust.

She nearly passed out from our first time, and now her switch is flipped again.

I get that she’s overjoyed we became true lovers today…

It’s thrilling, but if one round of sex broke her rationality this badly, I need to take control.

A weekend—or a whole day—spent in bed, going at it from morning to night…

It’s not like the idea doesn’t appeal, but I want to put off that kind of decadent downfall for a bit.

“—Ah! ♥”

“What’s wrong?”

Yuu, aroused while walking, suddenly stopped.

Holding hands, I stopped too, pulled by her.

“What’s up… ♥♥”

Rubbing her thighs together, she gave a shy, sloppy smile.

“It’s dripping… ♥♥♥”

“—!?”

Dripping? What? From where?

…I didn’t need to ask. I knew.

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

“Hey, what’s gotten into you!?”

Yuu closed the half-step gap slowly, teasingly, pressing her body against mine.

Her breath brushed against my neck.

Her hand stroked my chest.

Her hot, almost feverish breath. Her loving, erotic touch.

Her other free hand reached for her crotch.

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

Yuu exhaled warm breaths against my neck, then started sniffing me, her nose twitching.

Breathing out, sniffing me, breathing out, sniffing me… instead of breathing air, she was inhaling my scent.

She was breathing in a seriously perverse way.

…What’s with her? What’s going on? Isn’t this bad?

Is she a pervert? A pervert?

No matter how you look at it, this is pervert behavior.

Sure, Yuu sometimes shows an unusual side, but… could that side actually be…?

…No, hold on.

“Hey, Yuu, get it together!”

Oh, right, we’re in the middle of the street.

This kind of contact is way too erotic for public, out on the road.

…Too erotic?

This perverse kind of contact?

—Yeah, too erotic.

That’s what I thought.

I thought Yuu’s perverse behavior was too erotic.

Realizing I was accepting her actions that way, my head spun with confusion.

“No, no, no, no! I’m losing it too!”

Yuu’s overwhelming eroticism nearly had me hard in the middle of the street, so I grabbed her hand and started walking fast.

“Home’s right there! Come on, walk! Please, just walk!”

“Ren-chan’s stuff is dripping ♥ The rest still inside ♥♥♥”

“—Enough! Stop talking!”

Yuu’s sloppy grin, her flushed face, her eyes burning with lust. Her brakes are completely gone.

Why?

How did this happen?

How did she even get like this?

I’m scared because I can’t figure out what flipped her arousal switch. Where did I step on this weird landmine?

Thankfully, no one’s around. Making a scene could alert the neighbors.

—Finally, we reached the two houses side by side. Our houses, next door to each other.

“…Wait a sec…?”

Then it hit me.

“♥ ♥ ♥ ♥ ♥”

Is it okay to let Yuu, all flushed and breathing heavily, go home like this?

Her mom, probably home, might figure things out…

Or maybe it’s fine if she does.

We’re officially dating now, but outwardly, our relationship looks the same.

What’s changed is the substance—fake lovers to real lovers. No need to change how we act in public.

Alright.

“Come on, don’t stop. Let’s go home, okay?”

“Ahh! ♥ Don’t push my back with such naughty hands ♥”

“How’s pushing with my hands naughty? Just go home already.”

“Noo~ ♥ Stop it! ♥ It’s dripping more! ♥ All that stuff I was saving inside is coming out~ ♥♥♥”

“Saving it? What does that even mean!?”

I can’t believe I even entertained that thought for a second. So stupid.

“Ren-chan ♥ My home’s not that one ♥”

“What are you talking about? Your house is right there.”

“No way~!! ♥♥ I’m going to the house next door~ ♥♥”

“What’s with you, acting like we’re kids again?”

It’s like when a young kid throws a tantrum, not wanting to part with their playmate.

Back then, I’d be confused, thinking we’d see each other tomorrow, but kid Yuu would wail loudly when her curfew hit, being quite the brat. Another nostalgic memory flashing back.

“I’m staying at Ren-chan’s house tonight ♥ Staying at Ren-chan’s ♥ Staying at my boyfriend’s ♥ Getting taken home ♥”

“…”

Impressive. Her tantrum’s practically a prank at this point.

“Hey, okay, right? ♥ Ren-chan ♥♥♥ My boyfriend ♥♥♥”

She turned to me with a sloppy—no, a sloppy and sly grin.

She’s totally doing this on purpose.

—Ugh.

Blood’s rushing to my crotch again.

“…After you get permission from your mom.”

“Yay~! ♥♥♥”

As Yuu cheered, her house’s door opened.

“Oh, you two. Already back?”

The slightly suggestive comment came from a woman—not just any woman, a beautiful one.

Her name is Kiyomi Onodera.

Yuu’s mother.

Her toned body and youthful skin make it hard to believe she’s in her thirties or a mom. Her short hair gives off a lively vibe, and her gentle eyes make her a stunning beauty.

But according to her daughter, her true nature is terrifying. Recently, her libido’s apparently flared up, and I’ve seen her husband (Yuu’s dad) looking drained in the mornings. That… or maybe love is her anti-aging secret.

“Hey, Mom ♥ I’m staying at Ren-chan’s tonight ♥ Okay~? ♥”

“Oh…?”

Sensing something in Yuu’s behavior, Kiyomi’s eyes sharpened briefly as she looked at us.

“…Heh, I see ♪”

She smirked mischievously, as if she’d seen through something.

“Yuu.”

“What?”

Tilting her head at her mother, Yuu got a calm response.

“Do it right.”

“—! Yup!!”

Yuu’s face lit up with a blooming smile.

Then she turned to me.