Isn't It Only Natural for the Strong to Do as They Please?

"Open your mouth."

Eruka, who had still been glaring at me with her lips tightly pursed, slowly opened her mouth at my command. Her sharp fangs protruded slightly, and her luscious, pale pink tongue lay flat against the bottom of her mouth, showing itself off.

I slowly reached out my hand and first brushed against her sharp fangs. Rubbing them until they squeaked as if wiping them clean, I then ran my index finger over each of her teeth, mimicking the motion of brushing them.

"Ugh... Ah..."

With her mouth stretched wide open for my dental inspection, Eruka snorted hot breaths through her nose every time my finger brushed against her teeth. Perhaps because she had never allowed anyone to touch the inside of her mouth before, she seemed incredibly sensitive.

After probing her teeth for a good while, I switched targets. Grabbing her trembling tongue, which was pressed flat against the floor of her mouth, I slowly pulled it out.

"Ah... Ahh..."

The sight of Eruka obeying my touch despite the rebellious glint in her eyes was highly stimulating. As I toyed with her saliva-slicked tongue, kneading it between my fingers, her mouth slowly salivated, soaking my fingers in wet warmth.

"Ah, I almost forgot."

Realizing I had forgotten the second gift I prepared for Eruka, I left her kneeling with her tongue stuck out and headed toward the bed. Feeling around the sheets, which were drenched in Undine's fluids and my semen, my hand finally brushed against the object I was looking for.

Slide...

I draped my underwear, thoroughly soaked in sweat and the musk of my cock, over Eruka's nose as she stared up at it in sheer horror. I positioned the crotch area right over her nose so it wouldn't slip off, carefully adjusting the angle to ensure her face wasn't completely covered.

"Huuuh...?!"

Her nose twitched involuntarily, betraying her inner turmoil. Though she trembled violently, Eruka did not let the underwear fall from her face.

Drip...

"Hehh..."

A thick string of drool dripped from her fully extended tongue. Eruka's breathing grew increasingly ragged as her face flushed crimson. The saliva that had started to trickle was now pooling inside her mouth, nearly overflowing.

"Do you like it that much?"

Her watery blue eyes trembled faintly. I didn't wait for an answer, simply observing Eruka as she managed to keep her mouth open. To avoid disobeying my command, she kept her mouth wide; because of her open mouth, saliva pooled, making it hard to breathe, forcing her to inhale through her nose; and because of my underwear draped over her nose, she was forced to constantly inhale my scent.

This cruel, three-fold punishment was clearly eating away at Eruka's mental fortitude. The drool spilling from her mouth ran down her chin and over her neck, leaving wet stains on her collar.

Drip... drip...

"Haa... Ahh..."

Hearing the sound of dripping liquid from somewhere, I looked around and quickly found the source. It was the sound of viscous fluid dripping drop by drop from between the kneeling Eruka's thighs.

"Hngh?!"

She must have been leaking for quite some time; her mound was completely drenched, and her juices were dripping down to form a small puddle beneath her. I swept my index finger across Eruka's pussy, then wiped the slick fluid onto her cheek.

"Now, swallow."

Gulp.

"Ngh... Haa..."

The moment my command fell, Eruka pulled her tongue back in, shut her mouth tight, and swallowed the pooled saliva. The sight of her throat bobbing as she swallowed was incredibly erotic.

"Ngh...!"

After swallowing, Eruka naturally opened her mouth again and looked up at me. Her thirsty, longing gaze swept over my entire body, but she quickly seemed to snap out of it, turning her eyes away and tightly shutting her lips.

"Now, what should I make my slave do next?"

"A slave... Don't say such..."

Grab!

I roughly stuffed the underwear that had been resting on her face straight into her mouth. After packing it deep inside like a gag, I grabbed Eruka by her hair and forced her to stand.

"Ahg?!"

"You can't do this, you can't do that to your sister... I let everything slide, and here you are trying to crawl all over me again."

"Mmph...!"

Tighten!

As I tightened my grip on her hair, Eruka grimaced in pain but continued to glare at me, eliciting a silent gasp of admiration from me. To think she would bare her fangs after acting so submissive—she truly was like a wolf. The sight of such a wolf baring her fangs while gagged with my underwear, drooling helplessly, brought me immense pleasure.

Huff... huff...

With her mouth stuffed full of fabric, she couldn't close her lips. I wiped away the trail of drool running down her chin while ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠gently shaking her head by her hair.

"Keep holding it in your mouth. Don't take it out until it's completely soaked in your spit."

"Mgh...!"

Though Eruka glared at me with rebellious eyes, I stared back with an expressionless face and tightened my grip on her hair. Eventually, she submitted, averting her gaze and trying to catch her breath.

"Huff... haaa..."

After catching her breath, Eruka was left kneeling like that for dozens of minutes. In the end, she fulfilled my command, opening her mouth to show me the thoroughly drenched underwear inside.

I pinched the saliva-soaked fabric with my fingers and slowly pulled it out. Eruka, desperate to spit it out ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠as quickly as possible, opened her mouth even wider to make it easier for me.

Slide... splat.

The fabric scraped against her teeth as I pulled it free. I tossed the soaked underwear aside and observed Eruka's face as she glared up at me with her mouth still open.

"Huff... haaa..."

Perhaps because she had been holding the underwear drenched in my scent in her mouth for so long, Eruka's face already looked like that of a beast in heat. Her cheeks were flushed crimson, her eyes wandered aimlessly, and her breath came in ragged, shallow gasps. Now that the preparation was complete, it was time to begin her proper education.

Dangle.

Letting my semi-erect cock dangle, I stepped right up to Eruka's nose and commanded:

"First, I need to teach you how to use your mouth. Stick out your tongue."

"...Blehh—"

From her parted lips, a pink fruit slowly emerged. Extending her thick, saliva-glistening tongue until it draped over her bottom lip, Eruka glared at me, her tongue trembling slightly.

I rested my soft shaft directly onto Eruka's tongue. The wet contact sent a wave of hot warmth through my glans and shaft, causing my cock to slowly stiffen.

"Ah..."

As the cock resting on her tongue grew harder, it naturally began to push deeper toward her throat. Eruka, keeping her mouth open under my command, could only watch as the swelling shaft encroached upon her mouth, her eyes trembling wildly. I gripped my cock with one hand and tapped it against her tongue like a club.

Slap, slap.

The pre-cum clinging to the tip smeared onto Eruka's tongue, mixing with her saliva. I painted her tongue with my glans, thoroughly coating it in my pre-cum.

"Haa... Huff..."

Tasting the pre-cum while drooling like a puppy waiting for a treat, Eruka glared at me, her neatly folded hands trembling. Her sharp gaze held a desperate longing, so I rubbed my glans against her tongue and asked:

"It looks like you want something. Tell me."

"I do not..."

Pant, pant.

Eruka denied it with a twitch of her lips, but the moment she heard my question, her eyes flicked down to my cock. I didn't miss it; she was clearly reacting to it.

"Does my little bitch want to smell my cock?"

Press.

"Mgh?!"

I immediately pulled my cock off her tongue and pressed it against her face. Rubbing it all over her cheeks, philtrum, and around her eyes as if marking my territory, I smeared my pre-cum and her saliva across her skin before pushing my shaft right under her nose.

Though she frowned at the sensation ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠of the hard shaft pressing against her nose, her eyelids fluttered as the thick, musky scent of my cock washed over her.

Drip, drip.

As I rubbed my cock against her nose, forcing her to inhale the scent, saliva leaked continuously from her mouth. Like a dog being trained with treats, her lips twitched as if she wanted nothing more than to take the marking shaft into her mouth this very instant.

"A cock's smell... Why am I..."

Muttering as if something had gone terribly wrong, Eruka stared intently at my cock, her eyes filled with confusion as she gazed at it.

This was enough scent-marking. To let her taste the real thing, I slowly pulled my cock away from her nose.

"Ah..."

A soft whimper of regret escaped Eruka's lips as the shaft pulled away, but she quickly snapped out of it, forcing her eyes away from my cock to glare at me.

"Be patient. I'll make sure you get a proper taste of it."

"...Who said they wanted that..."

I couldn't help but chuckle at her prickly response, her rebellious spirit flaring up once more. Pretending to be uninterested while her pussy dripped with juices and she swallowed her own drool... It was far too obvious.

"Stop talking back and stick out your tongue. Oh, and..."

Glaring at me at my additional instruction, Eruka complied and stuck her tongue out again, curling it into a U-shape like a hollow pipe. I slowly slid my cock into it.

Slurp...

Fitting perfectly like a sausage in a hot dog bun, my shaft slowly pushed forward, advancing into Eruka's mouth. I slowly slid my cock back and forth over her long tongue.

Slurp, squelch...

As my cock squelched against her pooled saliva, making lewd, wet noises, Eruka kept her mouth wide open, staring down at the moving shaft with a look of desperate longing.

"You want to bite it, don't you? You want to stuff your mouth full of my cock and suck on it."

"Hehh..."

Eruka tried to deny it even as she offered her tongue, but her weak, breathless voice and the way her eyes remained glued to my shaft made her desire to suck it painfully obvious to anyone.

"When I tell you to suck, you suck. Understood?"

"...Y-Yes..."

Slurp, slurp.

I began to rub my cock over her tongue ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠at a faster pace. The sensation of her tongue wrapping snugly around my shaft like the folds of a pussy, radiating intense heat, made my hips move on their own.

Slap, slap, slap, slap.

Eruka's luscious lips trembled every time my cock brushed against them. Her wet tongue was already busy draining the saliva that pooled in her mouth like an overflowing sewer.

"Suck it."

"...!"

After tasting her tongue through a few more wet squelches, I reached my limit first and gave the order. Eruka, who had been staring intently at my cock, widened her eyes at my command and immediately puckered her lips, lunging forward to engulf my shaft.

"Suck...! Slurp, slurp...!"

As the root of her tongue wrapped around my shaft like vines and her lips squeezed tight around the column, my hips twitched. Looking down at Eruka, who was eagerly sucking my cock, I felt that all the time spent teasing her had been entirely worth it. There was no trace left of the proud warrior she had once been.

"Slurp♡ Suck, suck...!"

Her eyes curved into crescent moons, filled with bliss as she inhaled the scent of my cock. Her glistening lips repeatedly engulfed my shaft, making loud, wet noises.

"Do you love cock that much?"

I asked, stroking Eruka's hair with one hand. At my touch, she briefly glared up at me with a fierce look, but she quickly averted her eyes, focusing solely back on my cock.

"Heh, I guess you don't want to answer."

"Mgh?!"

Amused by her insolence—enjoying it so much yet refusing to answer—I grabbed her head firmly with both hands and pulled her toward me.

Eruka, who had been swirling her tongue around my shaft, was dragged forward by my grip, forcing my cock straight down her throat.

"Mgh, ugh?! Ohh♡"

As I thrust into her throat as if she were a fleshlight, tears welled in Eruka's blue eyes. Despite the tears streaming from her crescent-shaped eyes, her throat clamped down tightly around my shaft with every thrust as if she were enjoying it. Ignoring her gagging, I thrust even harder.

Splat, splat.

"Ugh, mgh, slurp... Phew...♡"

Her throat made filthy, wet noises as I thrust inside. Looking down at Eruka's face, which now had my pubic hair messily stuck around her lips, I roughly pulled my cock out.

Splat.

Slumping down into the puddle of her own juices, Eruka looked up at me with a dazed expression, her eyes locked onto my erect cock. Staring at the shaft that had repeatedly violated her throat, she naturally stuck her tongue out.

"Lick it."

I held my cock and thrust it toward her. Still slumped on the floor, Eruka pushed herself up on trembling legs, pressed her tongue against my shaft, and began to lick it with lewd, wet sounds.

"Haa... Slurp... Suck..."

Licking up the shaft, Eruka spotted the beads of pre-cum forming at the tip. She eagerly lunged forward, pressing her lips to the glans to suck it up. Kissing the tip as sweetly as a lover, she eventually took the head into her mouth, greedily sucking down every drop of pre-cum.

"I told you to lick it."

Grab!

"Ugh...! Y-Yes..."

When I grabbed her hair to reprimand her for forgetting her place and greedily sucking my cock, she glared at me with lingering rebellion. Yet, she ultimately went back to licking my shaft. Her mind wasn't fully broken, but her body had completely surrendered to my cock. I couldn't help but smirk.

"Haa... Slurp, lick..."

Licking her way up the shaft, Eruka focused her tongue on the sensitive frenulum just beneath the glans, swirling her tongue around it persistently. The intense pleasure made my hips twitch, and catching my reaction, Eruka smirked, teasing the spot even more relentlessly with the tip of her tongue.

"Fufu... Here? Is it here?"

Seeing me weaken, Eruka grew bold, dropping her formal tone entirely and teasing me casually as she pleasured me. I felt a flash of irritation at her insolence, but the sensation of her tongue constantly licking me was too good, so I held back and let myself enjoy the pleasure.

"Ah... You can't even move. Is a human's cock their weakness...?"

While she wasn't entirely wrong, her naive conclusion made me want to laugh. I held it in and observed her. Seeing me silently enjoy her tongue, Eruka grew even more confident and began to take initiatives I hadn't even ordered.

"Fufu, they say you like it more when I do this, right?"

Blehh, squelch, squelch.

Dribbling thick saliva over my glans, Eruka suddenly reached out, gripped my cock, and began to stroke it vigorously.

Squelch, squelch, squelch.

Her hand stroked my shaft rapidly, lubricated by her thick spit. Unable to bear the combined sensation any longer, I slapped her hand away and shoved my cock deep into her mouth.

"Mgh?!"

I flinched slightly as her fangs grazed my glans, but I pushed past them, driving my cock deep down her throat before unleashing the torrent of semen I had been holding back.

"Mgh?! Mmph, ugh... Hmmm...♡"

Eruka's eyes widened as the hot semen blasted against her throat. However, she quickly seemed to grow intoxicated by the rich scent of the fluid pouring down her gullet. Her eyes glazed over, and she clamped her lips tightly around my shaft, refusing to let me pull away.

Gulp, gulp.

With the sound of her throat bobbing, Eruka swallowed every last drop of my semen. She smacked her lips as if wanting more, milking my shaft with her mouth. Feeling her tongue and lips clinging to me, I forcefully pulled my cock out.

Pop!

She had been sucking so hard that my cock came out of her mouth with a loud popping sound. With my pubic hair still stuck to her lips from my rough thrusts, Eruka swirled the remaining semen around her mouth to taste it, then opened her mouth wide in sheer awe.

Despite the pungent smell of semen, Eruka smiled, looking genuinely delighted.

"Ah... So this is... semen...?"