I Was the One Who Met Her First
I placed both hands on Undine's head, stroking her hair as if I were already her master. Offering gentle words of praise, I fully savored the sensation of her mouth.
At first, she performed a mechanical blowjob, strictly following my instructions—taking it in, spitting it out, pulling back, and pushing it in again.
She tilted her head, clearly wondering if she was doing it right, so I guided her head with my hands to show her the proper rhythm.
“Slurp... Sucking... Mph...!”
Squelch, squelch.
As my cock stirred the water pooling inside Undine's mouth, a highly erotic, wet squelching sound echoed continuously.
The greatest advantage of a blowjob from a spirit was that she didn't need to breathe. At first, she only took in half the shaft, making me wonder if it was too difficult for her to swallow the whole thing. But once she got used to it, she easily took me all the way to the root. She had simply been holding back earlier.
“Slurp... Haa~ Does it feel good...?”
Undine, who had been bobbing her head with her eyes tightly shut, concentrating on the movement of her tongue and throat, looked up at me and asked.
“Yeah, it's the best...”
It was an incredible blowjob. Her cold throat squeezed my cock tightly, while her tongue occasionally swept up the shaft, teasing my veins. As I let out a ragged breath and stroked her head, she no longer shied away from my touch. Instead, she rubbed her head against my palm like a purring cat.
The urge to ejaculate was growing difficult to suppress. Undine's mouth was filled with my pre-cum and the saliva I had asked her to produce for lubrication. Before I blew my load in her mouth, I wanted to watch her swallow it.
Without a word, I gripped her hair and pulled her head back, popping my cock out of her mouth.
Pop!
A crisp sound, like a cork popping from a bottle, echoed from Undine's lips.
“Huh...?”
Stroking her head as she looked up at me, utterly clueless as to why I had pulled out, I gave her another command.
“Now, show me what's gathered in your mouth.”
“Like this? Ahhh—”
She opened her mouth wide and stuck out her tongue, showing me the pool of fluids glistening inside.
“Yeah. That's proof of how much you've helped. Men absolutely love it when you show them like that.”
“Really? Hehe~”
“Yeah. Now, put your fingers in your mouth and stretch it open yourself.”
“Ahhh~”
“Good girl. Now, swallow.”
“Mmh...”
Undine, who had been hooking her fingers at the corners of her mouth to show me the inside, closed her lips tightly at my command to swallow. Before doing so, she playfully swished the liquid around her mouth with a wet, squelching sound, giggled, and then finally gulped it down.
Gulp.
I heard the frothy liquid slide down the throat of the kneeling spirit. Tracking it with my eyes, I watched my pre-cum travel down her throat and into her abdomen, where it absorbed into the white sphere I had caught a glimpse of earlier.
Seeing it for the second time made me curious, so I asked her directly. “I can see a sphere-like object inside your body. Do you know what that is?”
“Mmm... Huh? Oh?!”
Undine, who had been rolling her tongue with her eyes closed as if savoring the lingering taste of the pre-cum, gasped in surprise at my question.
“A sphere? Did you see a white ball?”
“Yeah. A white ball about the size of my eye.”
At my answer, Undine's pupils began to tremble slightly—a clear sign of panic. Soon, the trembling stopped, and after catching her breath, she spoke honestly.
“That's my Spirit Core. It's not supposed to be easily visible...”
“Oh, really? I saw it earlier, too.”
“Seriously?!”
I continued to stroke the head of the startled spirit as I replied, “When you swallowed my... cum earlier. It was visible then, too.”
“Cum? That white stuff from before?”
“Yeah. That's the seed humans use to make babies.”
“A seed... No wonder it was filled with mana... That's why...”
Watching Undine lose herself in her own murmurs, I grabbed her head again and rubbed my cock against her lips.
“Mph?!”
Her tightly closed, plump lips puckered into a kissing shape as my massive glans pressed against them, sealing her mouth shut.
Slurp, suck.
Startled by the sudden intrusion, Undine glared at me with narrowed eyes. But soon, as if accepting her fate, she parted her lips slightly, took my glans into her mouth, and began to suckle. Watching her nurse on the tip like a baby with a bottle was incredibly erotic.
Slowly moving my hand from her hair down to her face, I cupped her cheek and gently scratched it with my finger. Undine giggled and tried to pull away from the ticklish sensation.
“Ahaha, slurp... Mmh...”
“I think I'm going to cum again...”
“Wait... Ahh...”
When I told her I was about to cum, Undine used her fingers to stretch her mouth wide open, just as I had taught her, and waited for my cock. I immediately thrust my hips forward, preparing to plunge deep into her mouth.
Lick.
I rested my glans on her outstretched tongue. After a brief pause, she lifted her tongue and licked the ridge of my crown, as if urging me to hurry up and put it in. A shiver of intense pleasure shot down my spine. I gripped her head with both hands and thrust my cock all the way to the root in one swift motion.
“Mph?! Haa...”
Because I had shoved it in so suddenly, my thick pubic hair pressed right against her lips. My rock-hard shaft pushed deep through her mouth, lodging itself firmly in her throat.
Wow, I can see everything...
Through Undine's slender, translucent neck, I could clearly see my twitching cock filling her throat. Because she was a spirit, her semi-translucent body revealed everything inside. It felt like peering into a forbidden, uncharted territory, making the sight infinitely more erotic.
I slid my right hand down and gently wrapped it around her slender throat.
“Slurp, slurp...? *Mph*...”
Undine, busy suckling my cock with her eyes tightly shut, opened them slightly when she felt my hand on her neck. Seeing that I was holding her throat, she closed her eyes once more, accepting it.
Taking that as silent permission, I squeezed a bit harder. To my surprise, my hand sank right into Undine's neck, slipping inside her throat.
I checked her expression. She gave me a slightly reproachful look, as if wondering what on earth I was doing, but since she didn't seem to be in pain, I knew it was fine. I pushed my hand fully inside her neck and gripped my own cock.
Gripping her hair with one hand, I used my other hand inside her throat to stroke my shaft. The root and glans were squeezed by her lips and throat, delivering incredible pleasure, while I vigorously jerked the middle of the shaft to bring myself to a quick climax.
“Mmm, haa... Mgh...!”
The sensation of a hand moving inside her throat must have felt incredibly bizarre, as she frowned slightly, but she didn't try to stop me. Feeling a sharp, sweet thrill rising from my pelvis, I knew a massive load was coming. I quickly pulled my hand out of her neck and gripped her head firmly once more.
“I'm cumming, Undine...!”
“Mmm, haa...♡”
Nod, nod.
“Ah, when a guy says he's cumming, if you squeeze your throat and suck hard, it feels even better.”
“Mph... slurp, suck.”
Taking my advice, Undine tightened her throat and puckered her lips firmly. Pressing her tongue flat against the shaft, she vigorously bobbed her head back and forth.
Unable to hold back any longer, I pulled her head close, burying her nose against my pubic hair, and let loose a torrent of pent-up semen.
Spurt, spurt...
The semen shot out with visible force, rushing straight down toward her abdomen. It gathered into a tennis-ball-sized clump, floating inside her body right where a human woman's womb would be.
Slide...
Then, to my amazement, the Spirit Core in Undine's abdomen shifted down to her womb area and began to absorb my semen without leaving a single drop. The clumped semen spread out and was instantly sucked into the Spirit Core. It looked remarkably like a fried egg, which I found fascinating.
“Haaah...♡ Slurp, suck...♡”
As I slowly pulled my hips back, drawing my cock out of her throat, Undine grabbed it. She wrapped her lips around the glans, where a few stray drops of semen still clung, and began to suck eagerly.
As she shivered while suckling the remaining fluid, her Spirit Core gradually expanded. Its pure, snowy white color began to darken, shifting to a murky, light gray.
“Haaah...♡ It's delicious...♡”
Having sucked out every last drop of semen from my urethra, Undine patted her smooth belly as if she were full. Though she had been panicked just moments ago when we discussed her Spirit Core, the taste of my cum seemed to have wiped all her worries away.
“Was my cum tasty?”
“Yes, it's the sweetest mana I've ever tasted...”
“If I keep tasting this, I might never stop thinking about it.” She placed a finger on her lips, licking off the very last drop of semen. Her seductive display made my cock throb and rise once again.
Startled by my sudden erection, Undine asked a curious question. “Sein has one of these too, right?”
“Of course. Every man has one.”
“If I do what you taught me today for Sein, will he really like it?”
At her question, I nodded firmly and assured her, “There isn't a man alive who would hate this.”
However, if I let her think she was already an expert, she would run straight back to Sein and give him a blowjob. So, looking at Undine as she patted her belly with a proud expression, I spoke up.
“But Undine, you're still too clumsy. If you do it for him now, it'll just tease him and make him frustrated.”
“Tease him?”
“Like... a feeling where he's right on the edge of finishing, but can't quite get there? It's a bit of a letdown.”
I struggled to find the right words and gave a rather long-winded explanation, but she seemed to understand. Undine knit her brows and said:
“Then what should I do? If I do it for Sein and he hates it...”
“Don't worry.”
I placed my hand on her head, gently forcing her to look up at me. As she stared up with her large, innocent eyes, I flashed my warmest, most reassuring smile and said:
“We still have to find the goblins. While we're exploring, I'll keep teaching you.”
“Wow...! Thank you, human... I thought you were just a mean, annoying human...”
“Not at all. I just think it's beautiful how hard you're working for the Sein you love.”
“Humaaan... Thank you so much, sniff.”
I had just spouted whatever nonsense came to mind, but seeing Undine get so emotional and tear up actually made me feel a bit guilty. It wasn't going to stop me from stealing her away from Sein, of course, but such a pure, innocent reaction was bound to catch anyone off guard.
“Come to think of it, I haven't even heard your name yet!”
“Ah, my name?”
“Yeah! You didn't say it when you joined the caravan either.”
To be honest, the main reason I hadn't shared it was because it felt a bit embarrassing. When I first transmigrated here, I used my real Korean name, but people kept pointing out how bizarre and unheard of it was. To avoid drawing unwanted attention, I took the name of someone I respected. But since it wasn't my actual name, it never quite rolled off the tongue.
Because of that, I usually just went by my title as a Silver-rank mercenary and kept my name to myself. However, keeping it a secret from Undine now might cause complications later, so it seemed better to just tell her.
“...It's Casano.”
“Huh? What was that?”
“My name. It's Casano.”
“Ah, Casano~ Casano. Casano! I memorized it!”
Leaving Undine behind as she happily chanted my name over and over, I adjusted my trousers. After warning her to keep her mouth shut, I stretched my stiff body and planned my next move to investigate the area below the stairs. A significant amount of time had passed; if I returned without any information, Sein's suspicions would only grow.