While Taking Care of My Shut-In Little Sister, I Somehow Ended Up Ejaculating Inside a Beautiful Girl - Chapter 87: Monster

Chapter 87: Monster

Tuesday after the three-day weekend, lunch break ended. In a secluded part of the special building, lined with labs and empty of people—

“Why!?”

“I need to confirm something.”

“That’s not what I mean—!!”

Ren Hoshimiya and Yuu Onodera, usually an affectionate couple, were arguing.

…Or rather, Yuu was raising her voice in a panic, while Ren tried to calm her down.

“Why would you suddenly say something like that…!? When you’ve got me, going home with Tsuki-chan alone…!”

Yuu’s voice started as an angry shout, almost a scream.

“No… that’s cheating… that’s cheating… No, no…!”

Her expression crumbled, her voice trembling as if on the verge of tears.

“No…! Ren-chan, you can’t abandon me…!”

“Look, it’s not like that—”

In front of a flustered Ren, this top-tier beauty and honor student, Yuu Onodera, shook her long, glossy black hair, frantically shaking her head.

“…I know it might bother you, Ren-chan, but I’m definitely coming along…”

Yuu knew her behavior—and the idea of actually following through—might make Ren dislike her, but she couldn’t stop herself.

The fierce light in her deep, dark eyes wouldn’t let her back down.

…But, despite her feelings—

“Fine.”

“…!?”

Ren casually allowed her to come along.

“…Huh!? I-It’s okay!?”

“Yeah. But follow us secretly. Don’t let anyone see you. Got it?”

“Uh… yeah, got it!!”

Looking up at Ren’s clear, steady eyes and his commanding tone, Yuu nodded vigorously, like an eager child.

“…It’d be bad if someone saw me, right?”

“Exactly.”

Relieved it wasn’t about cheating… she wished she could just feel that relief.

But knowing Ren was planning something without sharing the details left a nagging unease in her.

“…Okay. I won’t ask what you’re up to, Ren-chan.”

“Thanks. Man, I’m lucky to have such an understanding girlfriend.”

Seeing Ren’s faint smile, Yuu murmured, staring into his eyes:

“…I’m your number one, right, Ren-chan?”

“Of course. Or rather, you’ve always been my number one.”

“Number one… what? What am I number one at?”

“Well…”

Yuu could guess his intent, but she wanted to hear it from him. Needed to hear it.

“My number one… woman? Is that the right way to say it? You’re my lover, my childhood friend, we’ve been together forever, and yeah, I love you as a woman—”

“………………Nfu♥”

To Yuu, his answer exceeded her expectations, surpassing a perfect score.

Ren now understood her love, faced it head-on, and even reciprocated. Compared to before, their relationship had grown so much that Yuu was inwardly overjoyed.

“—Anyway, this time, there’s almost nothing for you to worry about. If anything, just try not to end up alone.”

“Don’t worry, I’ll stay by your side forever unless you push me away, Ren-chan!♥♥♥”

“R-Right…”

Seeing Ren look away, slightly embarrassed, Yuu grinned sloppily.

*

“What’s up today~?♪ Suddenly wanting to walk home together?♡”

After school, Ren and Yakko Tsukimi left the school entrance side by side.

Unusually, Yuu wasn’t there. Anyone who knew Ren and Yuu’s relationship might raise an eyebrow at the sight. But, fortunately or not, the two blended into the crowd of busy students heading to clubs or home, going unnoticed. Surprisingly inconspicuous.

“Thought it’d be nice for a change.”

“…! T-That means—!”

“Let me be clear: this isn’t about cheating or switching from Yuu. I got her permission.”

“Tch~…”

Yakko pouted and looked away, but Ren could tell she was partly relieved, even if disappointed, and the mood settled.

“I figured we needed to talk properly.”

“About what~?”

Ignoring her playful deflection, Ren fixed her with a serious gaze.

“What’s your deal?”

“…What~?”

“…”

Ren paused, thinking, then spoke again.

“Yesterday, you said that in front of Yuu.”

“Hm~? What’s that supposed to be?”

“…If you’re gonna play dumb, fine. I can pretend it never happened.”

“Ugh, no, wait! I was kidding! Come on, you can’t just brush off my confession like that! That’s not cool~!”

“…”

Ren had plenty to say about Yakko’s attempt to dodge with her usual flair, but he kept it to himself and said what needed saying.

“Yakko-chan, I have a girlfriend.”

“…!!”

Yakko froze, looking at Ren beside her.

“I love Yuu.”

His clear eyes met hers.

“I… see…”

Staring into his eyes up close, Yakko felt something new stirring within her.

Ren’s declaration of love for his girlfriend.

His words, by all accounts, were a clear rejection of her.

She expected to feel hurt, and she was hurt.

Yet, something unstoppable welled up inside her.

“I love Yuu, so I’d never leave her for someone else.”

“Uh… yeah… yeah…”

His unwavering gaze held hers.

And Yakko felt not only was she peering into his eyes, but he was starting to peer into hers.

“So—because I love Yuu—”

“Yeah—right—yeah—”

She was being drawn in.

Not into darkness.

Into an endless expanse of light.

“Ren-kun, why’d you ask me to walk home today?”

“Well… I thought I needed to properly turn you down…”

Meanwhile, Ren sensed something off with Yakko and adjusted his demeanor.

He realized the atmosphere was turning strange.

As Yakko leaned closer, he pulled back to maintain distance.

“…Thanks for saving me from that pickup yesterday.”

“Huh? You’re… welcome…?”

Her sudden shift threw Ren off.

“…And the week before… you supported me through that harassment, when I felt so alone… I was happy…”

“Wha!? Uh, y-yeah, well…”

What’s gotten into her!? Ren’s confusion deepened.

His back was already pressed against the wall of a house by the roadside.

Somehow, he’d been cornered.

“Ren-kun.”

“Yakko-chan…?”

Yakko felt her face being drawn toward his.

“Ren-kun…”

“Yakko-chan.”

What would it feel like to press her lips against his? She couldn’t stop wondering. If she went further, how much—

“Yakko-chan.”

“…!!”

Ren’s calm, clear voice snapped her back to reality.

Their faces were inches apart.

Ren pressed two fingers—index and middle—against her lips, signaling her to stop.

“Wait.”

“…”

His steady voice calmed the whirlwind of emotions she’d felt moments ago.

“Wait.”

“…I’m not a dog.”

His intervention worked, but Yakko pulled back, “cooling off,” and started walking again.

Ren followed a beat later, catching up to her.

“…It’s been a while since we walked home together like this, huh?”

As if nothing happened, Yakko struck up casual conversation, and Ren went along.

“Yeah. Since middle school, maybe?”

“Yup. I mean, it hasn’t been that long since we started high school, so it makes sense.”

“Feels like a whole year’s passed, though…”

“Haha, totally~!”

They chatted amiably, heading home.

Meanwhile, far behind them, a shadow trailed, keeping just enough distance to avoid losing them at corners… followed by another shadow.

“She’s getting that close to Ren-chan…! Unforgivable…!”

From behind a utility pole, a long-haired black-haired beauty seethed, practically biting a handkerchief in rage.

It was Yuu.

“Stay away…! A meter—no, a hundred billion light-years away! No woman but me should even touch Ren-chan…!”

She glared at Yakko, walking beside Ren, with murderous intent.

“This is just an exception! He insisted, so I reluctantly let him walk with her… But Tsuki-chan, if you actually make a move on Ren-chan, I’ll kill you!! I’ll definitely kill you!!”

Her killing intent was disturbingly genuine.

Yuu was the type who obsessively watched her beloved boyfriend and eliminated any woman who got close.

…Always had been.

So, her practiced tailing—her skillful, almost professional stalking—was just “charming” in its own way.

Yuu Onodera was, without a doubt, a deranged, obsessive, yandere stalker girlfriend when it came to Ren Hoshimiya.

“Still…”

The deranged stalker paused, groaning as she thought.

The problem was another shadow tailing them.

Whether they were after her beloved Ren or her hated rival Yakko, she couldn’t be 100% sure—

“That woman…!”

If it was a woman drawn to Ren, that possibility couldn’t be ruled out.

“If she’s after Ren-chan, I’ll kill her!!!”

Either way, any woman approaching Ren was a target for her wrath.

Yuu’s killing intent was palpable, enough to send chills down anyone’s spine, but her tailing was flawless— the other stalker showed no sign of noticing her.

“God…! Ren-chan’s too careless! Being too kind is a problem—though I love that about him♥ So wonderful♥♥ …Wait, focus. That’s not it… Ren-chan’s vitality might be running low… I need him to fill me up again…”

Describing her boyfriend’s semen like an addictive drug, she barely restrained herself and continued her double-tailing—stalking the stalker.

This was likely Ren’s plan.

Her sharp mind caught on.

“…Huh?”

And her sharp mind noticed something she didn’t need to.

“W-Why me…? It’s like… I was supposed to succeed at double-tailing…”

A faint terror hit her, belatedly.

“…What? What’s going on…? This kind of thing… could it all be Ren-chan’s…”

Torn between wanting to know the truth and dreading it, the pure, deranged, yandere stalker girl wavered.