No Way, Not Even With Family?

No way I'd do that with family too. I was on my way out of the park, heading back home. The night air felt refreshingly cool. Walking along the alley stretched long under the streetlights, it still felt like everything from just moments ago lingered somewhere in the air.

Han Choyeun was keeping pace beside me with light steps. Then, suddenly.

"...Hold on."

I stopped walking. I'd gone a few steps ahead and turned back.

"What's up?"

Han Choyeun was staring off into space. A moment later, she tapped the air with her finger.

"...Lemme check my status window."

It was a familiar motion. She scanned the window silently for a bit, then her eyes narrowed slightly.

"...This is weird."

"...What's weird?"

After checking a few more seconds, she looked up.

"Mana."

"...?"

"It went up."

"Huh?"

"It was A- when we tested it in the park earlier."

"...Yeah."

"It's A-rank now."

Silence fell.

"..."

"..."

We both sank into thought for a moment. I could understand her ability rank rising from the hidden quest reward. But mana had definitely been A- when we'd checked it right there in the park.

Han Choyeun scanned her status window again.

"Did another quest pop up or something?"

"...Nah, nothing like that."

At my answer, she tilted her head slightly.

"...That's strange."

After pondering for a bit, she glanced at me.

"...Gaon."

"...Yeah."

"Just now."

She paused, as if choosing her words—

"...What did we do?"

"..."

"..."

I didn't answer. No answer was needed. What had happened in the park moments ago naturally came to mind. In that brief silence, Han Choyeun's ears flushed a little red.

"...No way."

She muttered like it was to herself.

"...It can't be, right?"

But then she looked back at her status window.

"...The timing lines up perfectly, though."

"Yeah, it does."

Not during the power test in the park, but during that 'experiment,' I remembered her mana surging once. I'd been too busy lapping up her juices at the time to notice, but yeah, I remembered now.

Han Choyeun rubbed her forehead, continuing her train of thought, then—

"...Wait a sec."

She looked up at me.

"It sounds ridiculous, but..."

"...Go on."

"...Me."

She picked her words with an embarrassed look.

"...Because of you, when I... y'know, cum..."

"..."

"...My stats go up?"

...It was totally absurd. But if it was thanks to my weird, unfriendly unique ability, it made perfect sense.

We both stood there stunned, and she was the one who spoke next.

"Then... there's one way to confirm it."

"...What's that?"

Her lips curved up. The embarrassed face from before was gone; now she had a playful glint in her eye.

"Experiment."

"..."

"...Yeah, and multiple times... Can't be sure with just once."

Han Choyeun pretended to think, tapping her chin with her finger.

"...Need to clarify the conditions too."

"..."

"...Check the timing."

"..."

"...Measure the mana fluctuations again."

Then she tilted her head coyly.

"...So."

Her lips curved higher.

"...Guess we'll have to experiment again...♡?"

They say the night breeze is dangerous. Sex addict or whatever, that's all she could think about.

"Sounds good."

"...Eek♡?!"

I grabbed her waist and pulled her close.

"Let's do tons of experiments?"

"...Yeah♡"

Would doing it until she got sick of it cure her addiction?

* * *

The experiment was a resounding success.

"Haa...♡ Ha...♡"

Looking down at the bed, Han Choyeun was carefully gathering the semen dripping from her pussy like it was precious.

‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠

The moment we got home, under the pretext of 'experimentation,' we'd gone at it for a grueling five-hour marathon fuck session.

What we learned from the experiment: two things.

First, her hypothesis was correct. Every time she reached orgasm because of me, her stats—including mana—rose across the board.

Second was something totally unexpected.

...My own stats had skyrocketed insanely.

My base status window was mostly the same, but this second one showed growth at an absurd rate. Stamina and mana hitting B-rank in an instant said it all.

At this point, just keep fucking Han Choyeun for growth—sounds like a pretty sweet life, right? That's when one fact hit me.

Yoo Serin.

Yoo Raen.

The system had definitely issued quests targeting them. I'd put it off because of Han Choyeun's stuff first, but I couldn't keep delaying forever.

Especially since... they were family.

Blood or no blood, it weighed on me.

'It'd be great if those two hit S-rank too.'

The problem was the conditions for these hidden quests. From Han Choyeun's precedent, it seemed like fucking led to the reward of rank-ups.

If sex really was the condition for rank growth...

This was tricky.

Of course, Yoo Serin and Yoo Raen were smoking hot. No issue if they weren't family.

'But how could I do that with family...' ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠

...Still, I had to check.

I could wait for quests on other people, but... Yoo Serin and Yoo Raen were hunters. Anyone would wish for their family to return safely from the battlefield.

In that sense, even if I couldn't get them to S-rank, I wanted to help their growth through quests. Sure, the stronger they got, the riskier dungeons they'd tackle—but better than dying helplessly weak in one.

So, tomorrow—no, today—I decided to head back to the family home, pulled Han Choyeun into my arms, and drifted off to sleep.

* * *

When I opened my eyes, the sun was already well up.

Having slept deeply through the night, my body felt oddly refreshed. Glancing beside me, Han Choyeun was still asleep, clutching the blanket, her face peeking through tousled hair looking way more innocent than usual.

Nothing like the sly vixen from last night.

A chuckle slipped out. I gently straightened the blanket over her and quietly got out of bed.

No intention of waking her. She'd been on the verge of passing out last night anyway.

I threw on some clothes haphazardly and headed out. The moment I closed the front door, morning air hit my skin.

Cooler than expected, so I decided to walk. Familiar route, not far.

I took slow steps. Soon, the familiar apartment complex came into view.

And then.

A familiar voice from not far away.

"Huh?"

My steps halted. Around the alley corner.

Two women turned toward me, waving like they knew me.

...?

Why are they here?

"What? Why are you here?"

Yoo Raen spotted me first and came running ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠over.

"Uh, yeah? I... was just gonna drop by to see you and sis... haha."

...An awkward laugh escaped.

Like a thief with itchy feet, my lame excuse made Yoo Raen eye me suspiciously.

"...You eat something bad? Need allowance?"

"Nah, it's ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠not that..."

"You awakened too... Ah! Finally gonna tell me what it is?"

Right. I'd been hiding my ability.

...Sorry, Raen, still can't spill.

"Not that either."

"...Come on, how amazing can it be that... Ah."

She frowned, grumbling, then suddenly stopped as something dawned on her.

"...What's up?"

"Huh? Ha, haha. Nothing."

Suddenly hiding something herself. Roles reversed, Yoo Raen awkwardly changed the subject when Yoo Serin approached too.

"Gaon? What's going on?"

"Hey, sis!"

Her expression was cool, but I knew that gaze—somewhere warm and affectionate.

"Came to see you, sis. Missed you."

"...W-what...?"

...Why were they both acting weird today?

Words she'd normally brush off got a big reaction.

"...Why?"

"No."

Yoo Serin averted her eyes slightly.

"Just... hearing that out of nowhere."

"...Weird?"

"...A bit."

Yoo Raen, listening from the side, snickered.

"What, you finally growing up?"

"Shut up."

"Never calls, then shows up saying he missed sis?"

"...Just passing by."

"Liar."

Yoo Raen narrowed her eyes, scanning me up and down.

"Suspicious."

"...Of what."

"Your face."

"..."

We exchanged a few words on recent happenings after that. But they were busy with a guild mercenary request, so I couldn't keep them long.

"We gotta go."

Yoo Raen patted the bag slung over her shoulder.

"Dungeon request."

Yoo Serin nodded beside her.

"Have to finish by tonight."

"...Okay?"

They turned to leave. After a few steps, Yoo Raen looked back.

"Oh."

"...Yeah."

"If you really need allowance, say so. Rub my shoulders and I'll give you plenty. Heh heh..."

"......"

I saw off Yoo Raen with her lewd grin and teasing. Stood there watching their backs for a bit, then slowly turned around.

I deliberately headed in the direction of my place. Passed a few alleys.

Once fully out of the complex.

Stopped walking.

"...They're gone."

Checked behind once, then turned back toward the family apartments.

Passed the familiar entrance and went in. Took the stairs instead of the elevator. Didn't want to bump into anyone.

Climbed a few floors. End of the hall.

Stood before the familiar front door. Stared at it a moment, then punched in the code.

Beep beep beep beep beep beep—

Click!

Clunk.

Door opened. Slipped inside quietly.

House was empty, as expected. They'd gone to the dungeon.

The moment I closed the front door—

That's when it happened. A familiar window popped up in my vision.

Sure enough, the quest appeared. And one thing I could say for sure.

Devilish bastard.

Blackmailing me with baldness, how low.