Professor Kang's Reluctant Fellatio

"Master? Putting something so filthy in your mouth... I have to question if you're really the same intellectual being."

"Never heard of fellatio? Oral sex?"

I gently stroked Kang Mina's hair, petting her like a beloved animal. Even as my hand moved with that intimate familiarity, she kept her expression blank.

"I can't understand why I'd need to do something so unclean."

The more she refused, the more I wanted it. That's just how it worked.

"Professor, are you still a virgin at your age?"

"What nonsense is that?! I have no idea what you're talking about."

She started to flare up, then settled back down. Planning to respond with utter nonchalance, it seemed. That was the difference between them—Kang Mina truly knew how to control her ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠emotions.

Her reaction pretty much confirms I'm her first.

I grinned lewdly.

"Want to jump straight to sex, then? Pick one, Mina."

I tossed her two options: fellatio or sex. When faced with the worst choice, people naturally picked the lesser evil. I could already predict what Kang Mina, who couldn't refuse anyway, would choose.

"...How do you do it?"

Honestly, I wanted to thrust into her right then. But Kang Mina was a veteran hunter who'd seen it all.

Can't show any weakness here.

My cock was already swollen to its limit, but I kept my composure as best I could.

"Kiss the tip first."

"Haa..."

Realizing she had no choice, Kang Mina pressed her soft, moist lips to the glans. The sensation wasn't bad, but it wasn't ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠enough for real pleasure. The mental high, though? Pure bliss.

Her gaze looking up at me from below, she finished the kiss and waited for my next command. I stared at my massive cock throbbing like in some AV video.

What came next...?

"Lick my cock with your tongue. You know ice cream, right?"

Too proud to answer, she timidly stuck out her tongue and began licking. I savored the sight with a relaxed expression while she lapped at the shaft, still stone-faced. Whose composure would crack first?

Kang Mina had no special techniques. Her awkward, unremarkable motions should've been too weak to make me cum.

It's hotter than I expected, though.

Her tongue was scorching, making it more stimulating than anticipated. My body twitched reflexively each time it touched.

"From... from the top down."

"Hmph."

She glanced up with a pitiful look, then obeyed, sliding her hot tongue slowly from tip to base. Each pass came with her warm breath teasing my cock, which grew slicker with her saliva.

Hoo... getting cocky, are we?

Hot tongue or not, that was it. Her passive surface-licking wasn't enough to push me over.

I've done it a few times with Minji; no way I can't handle this.

Once I adjusted to the heat, it was nothing. A total newbie like Kang Mina couldn't satisfy me yet.

Time dragged on. The wet slurping sounds filled the room as she kept licking, until she finally gave up.

"How long do I have to do this?"

"Until I cum, obviously."

I spun the chair, brushing her face with my dripping cock. The wet smack was even stickier now.

This could get addictive.

If her tongue was that hot, her mouth had to be an inferno.

"Mina's doing so poorly, it might be impossible with your mouth."

I nudged her pussy with my toe.

"Hahk?!"

Startled, Kang Mina jerked back and banged her head on the desk—natural, since she was under it.

"Ugh..."

She rubbed the spot. As an A-rank hunter, it wasn't serious, but I worried anyway.

"You okay?"

"No need for Master to concern himself..."

Back to her blank face. Honestly, she was kinda cute earlier. I flashed a soft smile and petted her head.

She's reacting more now.

Sisters were sisters, after all—both adorable.

"Your mouth might take all day and still not finish me, so how about servicing me here instead?"

I tapped her pussy again with my toe. Forewarned this time, she didn't jump as much. But she was shocked for another reason.

Realizing I was targeting her virginity, she spoke up.

"Fellatio? Was that it?"

"Yeah?"

"Oral sex... sucking with your mouth, right?"

"That's right."

"I have to prepare for the spar soon. So end it with oral sex... please."

An unexpected reaction. I hadn't thought she'd take the initiative.

"Hmmm..."

"Master...?"

What to do? Force it? No problem there.

But that's amateur hour.

Could I really train Kang Mina by forcing her?

She's not some pushover; she'll get used to it eventually.

"How much time left? No lies—answer honestly."

She hesitated, then replied.

"An hour, but I need prep time."

"An hour's not that tight."

"There are other instructors and professors. To avoid suspicion, I need time to prepare..."

"Hmmm."

Fair enough—for someone teaching at Daehan Academy, she'd need time to clean up.

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

Won't that look more suspicious?

The weather was hot, though; maybe she could pass it off as sweat. Messing up her reputation wouldn't help under the contract. Vacation was just days away anyway—no need to rush.

What did I need to train her, then?

Break her spirit first.

"Then beg for it."

"Beg for what?"

I pointed below her waist.

"I want to go here, but if Mina begs nicely, who am I to say no?"

"You're truly the worst."

"So you do want sex?"

As I started to stand, she cried out desperately.

"End ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠it with fellatio... please."

Still poker-faced, but her trembling voice betrayed her humiliation.

"Doesn't sound desperate enough."

"What do you want from me?!"

"I told you—beg in a way that'll satisfy me."

"You... shameless, filthy beast!"

As she looked ready to explode, I jangled the contract mark on my wrist.

"Hmmm~?"

I hadn't realized it, but I had a bit of an S streak.

Her poker face finally shattered. Trembling with shame, she spoke.

"Please let me do fellatio... Master."

Her face flushed just like Kang Minji's. I wanted to see more.

"More directly."

Gritting her teeth, she finally said after agonizing thought,

"Please allow oral sex... Master."

That was her best effort, but it felt lacking. No sexual experience, no vulgar vocab—made sense.

Time to teach her.

"Try this."

"...You want me to say that crap?"

"Your choice, Professor."

"You... subhuman scum."

She gave up and opened her mouth. Gone was her initial poise, mumbling softly.

"...Please let Mina's mouth-pussy serve Master's cock..."

"Couldn't hear that. Say it with feeling."

"Mina's mouth-pussy...! Please let it serve Master's cock!"

Fuck, that was hot. Still a bit off, but huge progress. I felt like a total villain.

I smiled gently and stroked her head.

"Good girl."

"..."

She reacts differently to praise each time.

Praise might be her weakness. Teasing her, I said,

"Shall we see how Mina serves, then?"

"..."

Hesitant now that it was real, despite agreeing. Too advanced for a virgin, but no mercy.

Time for the whip.

"You have 15 minutes. Fail to make me cum by then... and punishment awaits."

"What?!"

"Professor, time's ticking."

Kang Mina hurriedly took my cock in her mouth. The moment it entered, her hot interior enveloped me.

Definitely scorching.

Her tongue squirmed like it hated touching, but dodging my thick shaft was impossible—almost like she was servicing with it. Giving up evasion, she looked up blankly, unsure what to do.

"Just gonna hold it there?"

With my cock in her mouth, she mumbled,

"How... am I... s'posed to do it?"

Did I have to teach every step? Not bad—染ing a pure white canvas felt great.

"Move your head slowly back and forth. That's it, good girl, Mina."

She started bobbing obediently.

"Mind your teeth. Good."

Even pet-like praise didn't seem to offend her much. I had to drill it in: she was the slave, I the master.

"Suck a little, like that... yeah."

"Churp, churp, haup..."

Sucking to keep saliva in, obscene sounds naturally followed. Shame flickered in her eyes, but she pretended it was fine and sucked diligently. Only the tip due to length, but I'd let it slide.

She's trying hard; no need to complain.

Her initially clumsy motions improved. Keeping relaxed grew harder—the technique sucked, but her unique heat and the fact I owned Daehan Academy's professor ramped up the pleasure.

Gonna cum like this... gotta make her swallow.

A guy's dream: creampie her mouth. Tough for a first-timer, though.

But I've got the Machina system.

No fishy taste? Should be fine. Essential skill to make her mouth-pussy serve eagerly.

Haa... fuck... Destiny Points at 4P; can't upgrade this one?

"Good... Mina... that's it..."

I kept praising and petting while manipulating the status window.

2P to LV2?

I dumped all points into Special Semen. LV3+ cost 2P each, capping at LV4.

40% replication? Can't hold back much longer...

Scanning the room, I spotted hot cocoa mix.

Change to hot cocoa flavor! Ability: Stress Relief!

"Ugh... cumming, Mina!"

I grabbed her nape and thrust in—not too deep.

"Mmph!! Mmph!"

Spurt... splurt...

I flooded her mouth like I was impregnating it. Semen filled her to the brim. Shocked by the suddenness, tears welled as she looked up, but she held my cock till the end.

"Don't spit—open wide."

Strings of fluid connected her mouth to my cock. Choking earlier, she panted vulgarly with mouth agape.

Flushed cheeks, tear tracks, mouth stuffed with cum—who'd guess she was Daehan Academy's professor?

Wanted seconds, but restraint won.

"Haa... haa..."

Her eyes trembled oddly—she had to sense something was off.

Hot cocoa taste, but color's still pale yellow-white.

"Swallow it all."

Gulp.

She did without resistance, then wore a baffled expression.

Yeah, hot cocoa-flavored cum's weird.

Her face even softened—skill worked perfectly.

Time check: nearly 15 minutes. Reward for obedience.

I petted her head—now familiar motion—praising her compliance.

"Good job. Listened well, so we're done for today. You did great."

"..."

Disappointing? But for the future, I'd hold back. One step forward, two back.

Face red, she turned away.

Time to properly train Kang Mina.

Oh yeah—today was Kang Minji's spar day.

"Today, right?"

"Pardon?"

"Minji's one-on-one match."