Chapter 12 - Chapter 11

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"Um, so—does that mean you two were just having sex?"

The track-and-field girl who suddenly barged into the house asked in an exaggerated tone.

To anyone with eyes, it was blatantly obvious that Aika and I had been having sex—so why was she asking as if she needed confirmation?

"Y-Yeah, I guess so."

That was all I could say.

More importantly—why had she just waltzed into my house uninvited?

She wiped the semen from my chest and face with a nearby hand towel (I decided to let that slide for now) and plopped down like she owned the place. Why?

"But that's weird, isn't it? At school today, you said you two were father and daughter, right? So that means you're a pervert who has sex with his own kid?"

If she was asking whether I was a pervert, I wanted to vehemently deny it.

We weren't blood-related, so we weren't breaking any taboos about incest.

But the undeniable fact remained—an adult man was having sex with a thirteen-year-old middle schooler.

"Who cares who we have sex with? Mind your own business! I'll report you for trespassing! And give my dad's pants back!"

That's right. She had taken my pants and underwear hostage—no, more like she had outright confiscated them.

Thanks to that, I was stuck sitting there with my lower half completely exposed in front of two middle school girls. A truly pathetic situation.

"No way. You're a criminal who just splattered a young, innocent middle school girl like me with your sperm. You'll have to endure a little humiliation as punishment."

Her logic was nonsense, but I did feel guilty about accidentally dousing her in semen the moment we met.

I couldn't forgive her for barging in without ringing the doorbell, but at the very least, the semen incident wasn't her fault.

"So, what do you even want? Breaking into someone's house and then demanding they sit around half-naked?"

Aika was sharp with her. Normally, I should've been just as firm, but my guilt over the semen incident made it hard for me to take a strong stance.

"Don't make me sound like some criminal. I just came to say hi, okay? I told you at school, didn't I? That I'd come by to greet you properly soon?"

I vaguely remembered her saying something like that, but I couldn't fathom why she'd go so far as to visit my home.

Even if she and Aika might end up in the same class, that was something that could've been handled at school once it actually happened.

"This makes no sense. And if you came to introduce yourself, why didn't you do it properly from the start?"

Aika was fully in combat mode.

Ever since their encounter in the school hallway earlier, she had clearly held some kind of grudge against this girl—even before the semen incident.

"My bad. I'm Sarashina Mizuki. Second-year Class A at Northwest Middle School, and as you can see, I'm usually drenched in sweat as a track team member. Right now, though, I'm drenched in this old man's sperm."

The girl—now identified as Sarashina Mizuki—smiled brightly as she introduced herself.

Trespassing aside, her smile was genuinely refreshing.

"You're Kasahara… Hiroichiro-san, right? And the young lady next to you is—"

"Kutsuki Aika."

Aika scowled. Since she'd demanded an introduction, she must've felt obligated to give her own name—albeit reluctantly.

"Wait, how do you know my name?"

At the very least, this was my first time seeing Sarashina Mizuki. Yet she clearly remembered my full name.

My surname could've been guessed from the nameplate at the entrance, but her knowing my given name and even my address was a mystery.

Had she been following me from school?

"Oh, that's just a maiden's secret. Don't worry, I'm not stalking you or anything."

Her words seemed more directed at Aika than me. The tension was so thick that Aika looked ready to pounce at the slightest provocation.

"So, is that it? If you're done, get out of our house already."

Aika clearly wanted her gone as soon as possible. I felt the same, but unless we figured out who this girl really was, we wouldn't be able to rest easy.

The fact remained that I had ejaculated on her, and without knowing her intentions, I couldn't just kick her out. If she went to the police afterward, it'd be too late.

"My original plan ended here, but… what should we do now? I did accidentally witness something pretty shocking between you two."

The girl, who had been smiling brightly until now, flashed a sinister grin.

It was only then that I realized—she had been hiding her true nature all along.

"A transfer student from Ueizawa, a proper young lady—who's actually a pervert having raw sex with her father. How do you think the students at school would react to that?"

A chill ran down my spine. Only now did I realize—we were being blackmailed.

"Go ahead and tell everyone if you want. We haven't done anything wrong."

Whether she was bluffing or had some other conviction, Aika stood her ground.

Even if we weren't blood-related, a father and daughter living together and having a sexual relationship would be a massive scandal.

"Aika-san might be fine with that, but what about you, Kasahara-san? If word got out that you were having sex with a middle school girl, do you think you could keep your job?"

In that instant, I saw Aika's expression stiffen.

She probably thought she could handle whatever was thrown at her.

Given her upbringing in the Kutsuki household, a little backlash from middle schoolers might not faze her.

But if the problem spread beyond her—that was a different story.

She would never allow herself to cause trouble for me.

Even after just a month together, I knew that much about her.

That was why Sarashina Mizuki's words had such power.

"Do you two even understand your situation? You've let me—someone who absolutely shouldn't know—learn your biggest secret."

In a way, that said it all.

There might not be photographic or video evidence, but if this got out, I'd be socially ruined. Aika wouldn't get off scot-free either.

In other words—our lives were now in her hands.

Whether we lived or died, it was all up to her.

"What do you want? Money?"

When I asked, she burst into laughter.

The polite facade vanished, revealing her true self.

"Money? I'm still a middle schooler, you know? What would I even do with hundreds of thousands—no, millions of yen extorted from you?"

The mention of "millions" sent a shiver down my spine, but money clearly wasn't her goal.

Still, the only thing I could think of offering was cash. What else could she possibly want from me?

"Then what do you want?"

Not money. Not our ruin.

What Sarashina Mizuki desired—

It was…

"...Isn't it obvious?"

What happened next was so sudden that neither Aika nor I could move.

Striking a pose like a panther, she locked eyes with me before shifting her gaze downward—to my exposed crotch.

With my pants and underwear confiscated, my penis was completely bare.

And without hesitation—she took it into her mouth.

I had no idea what was happening.

The warmth of her mouth and the softness of her tongue assaulted my manhood.

Despite my confusion, my erection grew steadily harder.

"...Wow. It really gets bigger."

Sarashina Mizuki's eyes widened as if seeing a penis for the first time.

Even if modern middle school girls were more experienced, unless she'd had prior encounters, this might've been her first time seeing one fully erect up close.

"W-W-What are you doing?!"

Aika, of course, wasn't about to stay quiet.

She grabbed Mizuki's shoulders, trying to pull her away from me.

But—

"You stay quiet and watch. Unless you want me to spill everything?"

Like a frog frozen under a snake's gaze, Aika could only slump to the floor, powerless.

"Still, this is crazy… If I take it all the way, my jaw might dislocate."

As she spoke, Mizuki deepthroated me.

Her technique was different from Aika's, and my erection reached its peak.

"Whoa! So this is how big it gets. It's like a whole different creature. Gross, but also… kinda impressive. And it's throbbing."

Staring intently at my cock, she began stroking me with her hand—larger than Aika's—in a slow, deliberate motion.

"Still, you really are a pervert, old man. I'm only thirteen, you know? Getting this hard from a middle school girl jerking you off?"

Unlike Aika, her strokes were slow and deliberate.

It felt like she was making sure I knew how much of a deviant I was—getting off to a young girl.

"Ah! It's twitching! What would happen if you came inside me? Would it feel really good?"

Her words sent a shiver down my spine as she licked the underside with an upward glance.

With her boyish, wild looks, the whole act felt almost animalistic.

"Don't worry. I won't go that far yet. Even I'm scared of my first time."

Yet implied that she'd eventually demand raw sex—just like Aika.

Sarashina Mizuki, with my cock in her mouth, was a different kind of beauty compared to Aika.

Her short, boyish hair was untamed, slightly sun-bleached.

Her sharp features resembled a pretty male idol, but her individual traits were undeniably feminine.

Her track uniform revealed a toned body from daily training, yet the curve of her hips, the dip of her waist, and the line of her collarbone were distinctly womanly.

Her chest wasn't as large as Aika's, but for a thirteen-year-old, she was well-endowed. From her leaning position, I could even glimpse a hint of cleavage. Was she not wearing a bra?

I barely stopped myself from reaching out to check.

But my cock had other plans—it was nearing its limit.

She gradually increased the pace of her hand and mouth, edging me closer to climax.

Her rhythm control was impeccable—was this a skill honed from running? It didn't feel like her first time at all.

"Ngh—"

Finally, I reached my limit.

My cock erupted, spraying semen all over her face.

At this proximity, there was no mercy.

My cum splattered across her forehead, sun-kissed hair, tanned arms, shoulders, and even her thin uniform, thoroughly marking her.

This was on a whole other level compared to earlier—Sarashina Mizuki was drenched in my essence in seconds.

"Wow, it's still coming…"

Enjoying the facial, she smiled at me like a lover.

With a few final strokes, she milked the last drop—and then, on a whim, licked it up.

Immediately, she grimaced.

"Bleh—! Bitter! How can you swallow this stuff?"

Despite her disgust, she gulped it down without spitting or rinsing.

Maybe, like Aika, she had a natural talent for this.

"Anyway, my demand is simple—this old man's body. If you don't want your secret exposed, you'll let me have sex with him—wait, why are you crying?!"

I turned to see Aika slumped on the floor, bawling her eyes out.

No, more like throwing a tantrum.

She was wailing like a little kid.

"He's my dad…! Mine alone!"

This was a side of her I'd never seen before.

Even when Kutsuki Daijirou had coldly rejected her, she hadn't broken down like this.

It was like watching a child whose favorite toy had been snatched away.

"Okay! Okay! I won't take your dad away! Just stop crying already!"

Mizuki was flustered by the sudden outburst.

(Though I was the most confused here.)

Aika's tearful face had that much impact.

"...Really?"

Sniffling, Aika looked up at her with puppy-dog eyes.

The cuteness was lethal—even Mizuki seemed affected.

"Really, really! So stop crying! It's all my fault!"

Shockingly, Mizuki caved and apologized. Had Aika's tears actually worked?

"I'll come clean! I, Sarashina Mizuki, live in Room 202 of Sazanami-so!"

"Room… 202?"

Sazanami-so was this rundown apartment.

And Room 202 was right next to mine.

"Until recently, I thought my neighbor lived alone… but then I started hearing these noises. At first, I thought you were watching incest porn, but it didn't sound like that. Then today at school, I saw Kasahara-san with a girl and realized—you two were the ones going at it next door!"

Like a kid confessing to a prank, Mizuki explained herself.

Both Aika and Mizuki could switch between seductive and childlike in an instant. Middle schoolers were truly mysterious creatures.

"I thought if I played my cards right, maybe I could join in. I never meant to actually blackmail you! I just barged in hoping to casually ask if I could be part of it. But then the old man's cum hit me, and I got carried away…"

Twirling her fingers awkwardly, Mizuki looked down in embarrassment.

She really hadn't planned to threaten us—she'd just gotten swept up in the moment.

"So… you just wanted to be part of what me and Dad have?"

Now Aika was on the offensive. Her earlier tears had vanished without a trace.

Girls were terrifying.

"Well, yeah! I'm curious about sex! It's that age, you know? And hearing it every day next door just made it worse…"

That part was our fault.

The place was usually so quiet that I'd assumed the rooms below and beside us were empty.

"You could just get a boyfriend or something."

Aika had a point. With Mizuki's looks and figure, finding a boyfriend would've been easy.

"But they're scary! Middle school boys are like wild monkeys! Even if it's their first time, they'd just mindlessly thrust away without caring about the girl!"

I hadn't lost my virginity in middle school, but I could see her point.

At that age, boys were hormone-driven and wouldn't care about their partner's pleasure.

"But paid dating is scary too… Still, an old man like you seemed gentle. Like you'd actually make it feel good."

Mizuki's expression brightened.

It was true—I'd never force myself on a girl, and I always made sure they enjoyed it.

After all, sex was a mutual act. Aika had taught me that.

"But you didn't have to barge in like this…"

Aika was still sulking. She must've been furious about having to watch Mizuki give me a blowjob.

"Sorry about that! Next time, we'll do it properly with all three of us! That's fine, right?"

"Hmm…"

Aika fell deep into thought.

Wait, why was she considering it? Shouldn't she have refused outright?

"I won't lay a finger on the old man without Aika's permission!"

Somehow, she'd switched to calling her just "Aika." At this point, it looked like two middle school girls casually chatting.

"Really? You won't touch him?"

"I won't!"

"And you'll obey all my orders?"

"Absolutely!"

Aika's demands were escalating rapidly. Their positions had completely reversed.

"Fine! You better remember what you just said."

Aika smiled brighter than she had all day.

But I noticed—

Beneath that smile lurked something far more devious.

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