Sister's Reluctant Aid and the Centaur's Burning Heat

"Cock upgrade. Maximum length of only 50 centimeters? I made a face like that was utterly ridiculous.

"Cut the bullshit. Even if we don't share blood, you're my big brother and I'm your little sister."

"Typical old fogey bullshit," Jenia said, crossing her arms with a dissatisfied pout. She watched quietly for a bit, then spoke up again when she saw I was still struggling to get it up.

"Don't you have better things to do? Aren't you going to save the kids?"

"Yeah, I am, but..." No matter how much I rubbed it with my hand, the damn thing wouldn't stand. I'd shake it and let go, and it'd start to stiffen only for the head to flop limply right back down. My arm was getting numb.

"This is frustrating. Move your hand."

Jenia plopped down in front of me without warning and grabbed my dick.

"Hey! What the—?!"

"I don't like touching my shitty brother's pathetic dick any more than you do, so shut up. We're just short on time."

Short on time? You ditched the kids to come here.

"I said don't touch it!"

"Quiet."

She gripped the floppy shaft and started stroking it busily back and forth. Shlick. Shlick shlick.

"Ngh...!"

What a pathetic bastard I am. Even in a situation like this, it felt good having Jenia jerk me off. Her hand was slender and soft—definitely a woman's touch. I tried to tell her to stop, but since she'd already touched it, wasn't it too late? Hadn't we already crossed the line? The words just wouldn't come out.

"It's getting a little harder now that I'm doing it, right?"

"Yeah... it is..."

I swallowed hard. Was my dick discriminating or something? Under Jenia's gracious touch, strength started building in the shaft. Truth be told, I could feel it. It felt way different—and better—when someone else did it for me.

"What a nasty brother you are. Look at it growing just because your little sister is helping. Don't tell me you're getting turned on by me? This perverted dick deserves punishment."

Jenia spat her venomous words while smacking my dick lightly—then suddenly buried her face in my crotch and engulfed it in her mouth.

"Guh! J-Jenia!"

"Slurp, slurp, stay still. Chuup, chup."

"Nngh...!"

Her powerful suction had me squirming like I desperately needed to piss. Fuck. The pleasure from her sucking so hard was insane—I thought I'd lose my mind. But this was wrong. The one sucking my dick right now was my little sister!

"S-Stop...! We can't do this...! Ngh...!"

"Slurrrp, mmm... slurp slurp! God, the stench of your filthy cum is overpowering. You fucked those bitches earlier and just pulled your pants up without washing, didn't you?"

"W-Where was I supposed to wash...? Anyway, stop...!"

"I can't believe I have to micromanage every little thing for you. You're like a damn kid. I'll suck it ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠clean so it doesn't stink—just shut up and stay still."

Jenia wrinkled her nose but kept sucking diligently. Maybe because she was my sister, her blowjob was meticulous and thorough, like she was carefully cleaning it. I could even feel her tender care, worried about hurting her precious big brother's dick.

"Haa, slurrrp. Pwah, slurp, chuup!"

She teased the head with her tongue, deepthroating the shaft over and over, sucking my balls too. It was a rough, unskilled blowjob with no fancy techniques, but the pleasure was undeniable.

"Ngh... What kind of guy am I...!"

Pathetically, here was the sleazy big brother whose dick got fully erect from his little sister's blowjob. It stood tall and proud, ready to pierce any pussy or hole in sight.

"Smack, chuup. Tslurp tslurp!"

Even so, Jenia didn't stop. Now that it was bigger, it was easier to suck, and she went at it even harder than before.

"Mmm... Even after sucking it, the stench is still intense. Bragging about how thick your cum smells? No wonder no woman can resist you. What a monstrous dick."

Jenia kept berating me, but her face looked utterly blissful, like she had a sweet candy in her mouth. Her hands and body grew more lewd and slutty with every motion.

"Ahh, mmm... slurp! Slurp!"

If anything, she seemed to be the one getting off on using my dick. Her hand kept dipping toward her short skirt, hesitating just before slipping inside.

Does she want to touch her pussy? But she held back in front of me. Well, yeah. As a dark elf, Jenia probably had stronger sexual urges than humans. It was common for dark-aligned races. They were born with innate promiscuity and depravity. Orgies, rape, gangbangs, swapping—they happened all the time in their neighborhoods. That's why dark races had superior fertility compared to light-aligned ones. So, regardless of her intentions, her racial instincts were heating up from sucking my dick, putting her in a tough spot. I should say something to cool her down.

"Hoo, where'd you learn to suck like that? You had a boyfriend?"

"Never dated. Slurp."

"Still a virgin then?"

"Yeah."

"How are you so good at it if you've never dated?"

"I watched the women in your room do it to you and practiced."

"Whoa, that's crazy. I taught my little sister something useful! Lucky future husband. Your wife's gonna suck dick like a pro."

"I'm never getting married."

"What? No marriage?"

"Nope."

"Mom and Dad will chew you out."

"You're so dense. I hate it. Shut up with the stupid talk and just cum already. Hurry up and blow your load from this pathetic dick."

"I've got a lot, so watch out."

"Slurrrp! Slurrrp!"

"Guh...! F-Fuck, it's so tight...!"

What did I say wrong? Like she was venting her anger, Jenia's head started bobbing furiously back and forth. Her irritated sucking felt almost spiteful. The lewd, squeezing slurp slurp sounds echoing in the room amplified the stimulation unbearably. Intense pleasure shot up my spine to my brain, and I felt liberation crashing over me.

"Kuh! Here it comes!"

Spurt! Spurt! White fluid erupted from the flushed head like a volcanic explosion.

Jenia tightened her lips and swallowed my throbbing dick deep into her mouth over and over.

"Mmph! Gulp! Gulp! Ngh...! You cum in my mouth too...? Telling me to marry someone else? Slurp! A lowly, pathetic brother who gets horny in front of his sister...! If you're gonna be a playboy, just pin me down too! Mmph! Slurp slurp! Gulp!"

She seemed to say something huge, but in that moment, my body shuddered with orgasmic bliss, and I couldn't hear a thing. For about ten seconds, I unloaded like I was pissing, filling her mouth with cum.

"Mmph!"

There was just so much that even Jenia, gulping it down eagerly, panicked. She pulled off halfway, coughing and sputtering it up. Guess it's too much volume for a blowjob newbie. Her mouth, chin, and chest were coated in sticky fluid.

"Haa, haa. I thought I was gonna die."

"Sorry. Should've been more careful."

"Cum in bursts from now on."

"In bursts? Impossible."

"Then I can't swallow it all."

"Who asked you to?"

I chuckled and let out a relieved sigh. Felt great to blow my load. That's when I heard a clink from the floor. Looking down, the penis ring enhancement tool I'd put on had slipped off when my dick shrank post-orgasm.

"Oh shit! I forgot to test this thing!"

I hurriedly ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠picked up the penis ring enhancement tool, slipped it back on, immediately cast

and had Jenia suck me off again.

After one round, I'm casually asking for another...

The subtle taboo thrill mixed with soaring pleasure, but this time I stayed sharp.

"Tslurp! Tslurp!"

"That's enough! This'll do!"

My dick swelled quickly, and the enhancement tool clamped tight. I redirected my mana flow toward it. The original penis ring and the enhancement fused into a new one, seeping into the base of my dick and vanishing without a trace. No sensation of wearing it, just like before—but I could summon it at will anytime.

And at the same time...

I realized the upgraded penis ring's new powers.

"Unbelievable..."

It stretched out to a massive 50 centimeters.

"Th-This is practically horse cock territory...?"

I'd gained an absurd ability that left me speechless. Thanks to the enhanced ring, I could now freely adjust my dick's thickness and length. Max length: 50 cm. Max girth: 7 cm. Like a damn magical staff.

"Bro, only a dragon could handle sucking this."

Jenia marveled, fondling it for a while. For fun, I playfully smacked her ass with it. The firm, bouncy feel transmitted perfectly. Great dick bat.

"Hahaha!"

"What the hell! Hahaha!"

We both burst into absurd laughter.

Meanwhile, ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠as Naru tidied up and exited the ancient king's tomb...

Lamora, leader of the centaur herd, ran into some sleazy adventurers and fell for their trick.

"Ehehe! Serves you right!"

They'd seemed friendly at first, but revealed their true colors, trying to steal the centaurs' gear. When they failed, they mocked and fled.

Lamora grimaced and slumped to the ground.

"Ngh...! Of all things, an aphrodisiac...!"

Shouldn't have drunk that beverage they offered...! Lucky she noticed right away when she drank alone—otherwise, the whole group would've been dosed.

"Hngh...!"

Lamora clutched her melting chest. Heat built in her body, her inner thighs twitching sensitively.

"M-My body... Haaah...!"

"I brought water! Drink some, Lady Lamora! Lady Lamora!"

"This is bad! To cure it, we need an antidote or a man!"

But there ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠were no male centaurs in the group. No antidote either. Lamora's subordinates anxiously supported her and hurried away.