I Met Her First... The Mid-Grade Spirit, Undine

I placed my hand over her abdomen, right where her Spirit Core was located, and studied Undine's face.

Seeing her panting softly with her tongue lolling out, looking entirely clueless, it ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠didn't seem like the contract had been successfully established.

The core had first changed to a light gray, and now it was a dark, murky ink. I speculated that if she ever fully contracted with me, it would ultimately turn pitch black.

"What a shame. It looks like the contract failed?"

[Thank... thank goodness...]

Undine forced her head up with difficulty to inspect her own Spirit Core. Once she confirmed everything was fine, her head dropped back down as she mumbled.

"I guess a contract isn't something that just happens so easily?"

When I asked mischievously while caressing her abdomen, Undine averted her gaze and answered curtly.

[Of course contracting with a spirit isn't that easy...!]

The way she stole glances at my face to gauge my reaction was quite cute.

[But it's dangerous to keep going like this... I shouldn't take any more of Casano's semen...]

"Does that mean you're going to stop learning?"

[T-That's...]

I leaned over, pinning Undine beneath me as she lay there trying to look away. Trapped under my weight and nervously reading my expression, she glanced down at my cock, which was still buried deep inside her cunt, and murmured softly.

[It's not that... Ah, n-ngh... ♡ Don't move...]

Pop!

As I pulled my hips back and slipped my cock out, Undine's cunt clamped shut instantly, as if it had never been stretched open. I gripped my shaft and tapped it against her belly like a drumstick.

"You're only learning all this for Sein's sake, right?"

Tap, tap.

[...Yes...]

"Once you learn perfectly from me and draw out Sein's semen, imagine how happy he'll be, hm?"

[Sein...]

Was she imagining Sein shuddering with pleasure as he ejaculated inside her? A faint smile returned to Undine's previously gloomy face.

"I'm not doing this just for my own pleasure, right?"

[Yes... you're right...]

"I was only trying to help, but hearing you say you can't take any more... hurts my feelings a little."

I looked down at Undine with a slight pout. Her lake-like eyes reflected my deeply disappointed expression.

Her pupils trembled, and her dainty lips parted to offer a small apology.

[I'm sorry... Casano was only trying to help me...]

"Then I'd like to ask you for some cock service."

[Cock... service...?]

Undine swallowed hard as she stared at the cock resting on her stomach, hesitating.

I had played with her however I wanted under the guise of "teaching," but "service" was a different story. Undine had likely realized that instinctively.

But even if she realized it, it was too late. I already knew how poorly she handled being pushed to the brink of pleasure. She was already a delicious prey, entirely at my mercy.

"You'll do it for me, right?"

Undine had already tasted the pleasure my cock could give her. What did spirits even do for fun anyway? They could barely taste real food, and the only things they could feel were mana and the emotions shared through their contract.

Knowing that even my meager amount of mana was enough to drive her wild ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠with pleasure, I had absolutely no reason to back down.

Staring at me with trembling eyes, Undine eventually gave a faint nod.

"I suppose I'll have to teach you from the beginning again. First, get on your knees."

Undine, who had been looking up at me from the floor, slowly sat up at my command. She knelt politely on the ground and looked up at me.

[...]

"Next, kiss it to prepare for the cock service."

[K-Kissing is... I can't...]

"Just think of it as practice. Cock service practice. Okay?"

I tapped my cock against the bridge of the hesitating Undine's nose. A clear thread of pre-cum stretched from the tip and smeared onto her nose.

Tap, tap.

[But... kissing is... for someone you love...]

I placed my hand on her head as she dithered, stroking her hair gently. Watching her flinch at my touch, I spoke calmly.

"We're just practicing beforehand so you can do it all for Sein later, right? Come on, I'm going to lose my erection at this rate."

Seemingly resigned, Undine squeezed her eyes shut, puckered her lips, and slowly leaned toward my cock.

[Mmh, ah... Haa... Slurp...]

Her tightly puckered, cool lips pressed against the tip of my glans with a soft peck, then slowly pulled away.

My cock, which had been softening due to her hesitation, instantly surged back to rock-hard life. I stroked her hair, urging her to keep kissing it.

[Chu... Mwah... Slurp... ♡]

Her lips, which had been lightly pecking like a bird, tasted the dripping pre-cum. Soon, she began pressing her mouth greedily against the glans, kissing it repeatedly.

Mwah, mwah, slurp.

"Haa... Now, take it into your mouth."

[Hahm... Slurp...]

Finishing her last kiss, Undine parted her lips and slowly swallowed the head. Her thoroughly wet mouth slicked the glans with moisture.

"From now on, I'm going to teach you how to serve me with your mouth-cunt. Understood?"

[Slurp... Yes... ♡]

Having tasted the pre-cum, Undine surrendered herself to pleasure once more. The vibration of her voice humming against my shaft made my hips twitch slightly.

"Stick out your tongue."

[Slurp... Ahh—]

I rested my glans on Undine's fully extended tongue. Gripping my shaft, I rubbed it against her tongue, using the sticky pre-cum like paint.

Saliva dripped from her open mouth and lolling tongue. I calmed Undine down as she grew desperate to swallow the pre-cum smeared over her tongue.

"You only swallow when I tell you to, okay?"

[Yeth...]

Squelch, squelch...

The mixture of thick saliva and pre-cum made a highly lewd, squelching sound. Fearing that the mixture might spill, Undine kept her tongue raised and level.

After rubbing the glans against the tip of her tongue, I rested my shaft flat on it and commanded her.

"Swallow."

Like a racehorse hearing the starting pistol, the moment the command fell, Undine lunged forward and swallowed my cock deep into her mouth. Her throat bobbed as she gulped greedily, clearly eager to swallow every drop of pre-cum.

Her desperate display brought a natural chuckle to my lips. I reached down and caressed her cheek.

With her mouth stuffed full of my cock, Undine nuzzled her cheek against my hand in delight.

"Now, move."

[Slurp, chupa... Slurp, slurp... ♡]

Squelch, squelch.

The obscene sound of her freshly pooled saliva squelching against my cock echoed in the quiet room.

[Puh-hah... ♡ Slurp, mwah... ♡]

After taking me all the way to the root, she spat out my glistening, saliva-coated shaft, kissed the very tip of the glans, and looked up at me.

"That's enough for the mouth-cunt."

Remembering what I had hinted earlier about what would make me happy, Undine blurted out an unprompted thank-you.

[Thank you so much for using Undine's mouth-cunt... ♡]

"Now, stand up."

At my command, Undine sprang up and awaited her next instruction. Stone dust showered down from her knees and shins, but she didn't care in the slightest.

"Now, I'm going to make your body look like a human woman's."

[Yes...]

I poked Undine's slightly swelling breast with a finger coated in mana.

[Ah-hn... ♡]

Using my index finger and thumb, I pinched the tip of her breast, twisting and slowly pulling it outward.

Like slime, her ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠breast flesh slowly stretched out, molding itself into the shape of a nipple.

"This is a nipple. What is it?"

[A nipple...]

"You have them on both breasts. Try making the other one yourself."

[I've... seen them before...]

Undine closed her eyes and slowly altered her form. Watching protrusions take shape on her previously flat breasts was incredibly erotic.

They were clean, flawless nipples with narrow areolas and no blemishes. I tugged on them gently with both hands and spoke to her.

"From now on, whenever you're with me, you must always form these nipples. Understood?"

[Yes... Whenever I'm with Casano, I'll be sure to show you my lewd nipples...]

"Casano?"

I yanked on her nipples as if playing tug-of-war.

[Heeeyah...! ♡ M-Master! ♡ You're my Master! ♡]

"And when I touch you like this, make sure you squirt water from your cunt too. Got it?"

[Yeth... ♡]

As if she had already obeyed, when I slid my right hand down to caress her mound, my fingertips came away dripping wet. After all, without these bodily fluids, the experience lacked visual and auditory flavor.

I took a step back and admired Undine's body.

Her perky breasts, tempting nipples, plump mound, and fleshy rear—while not overly voluptuous, it was a body perfectly suited to my tastes.

With a thoroughly dazed expression, Undine placed her hand over her abdomen and stared at me longingly.

[My womb... is throbbing... ♡]

[I want to taste Master's mana so badly... ♡]

My cock twitched as I pressed the tip against her lower belly, right over where her womb lay. Undine shuddered and took a step closer to me.

[Ah... It's so hot... ♡]

"Do you want me to thrust this deep inside you?"

[If Master thrusts his hot cock into my cunt... I feel like I'll melt away...]

I shrugged, pressing my shaft firmly against her lower abdomen while remaining silent.

Undine stared at the cock pressed against her, still hesitating.

I kept my silent gaze fixed on her. Reading my eyes, Undine seemed to understand. She swallowed hard and wrapped both hands around my ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠shaft.

[Ah...! Such a huge, hot cock... ♡]

[If I take any more semen, I don't know what will happen...]

[Haa... I don't care about anything anymore...]

Mumbling incoherently as if her mind was completely scrambled, Undine finally guided my firmly gripped cock toward her cunt.

Slurp.

The moment my cock brushed against her tightly closed mound, her slit clamped onto the glans, begging for entry. Flustered by her own twitching, eager cunt, Undine parted her folds as much as she could and slowly pushed the shaft inside.

Teased by the way her tight inner walls nibbled on the head of my cock, I brought my hands out from behind my back and gripped her hips.

[Ah...! ♡]

Perhaps remembering how I had grabbed her hips and thrust into her during our first lesson, Undine let out a soft moan and completely surrendered her body to me.

"From now on, you're a bitch. Do you know what a bitch is?"

[I don't know...]

Seeing Undine hang her head and avoid my gaze, I chuckled. I leaned in, rubbing my cheek against hers to force her head up.

Feeling her cheek trembling against mine, I ran my tongue up her neck, slowly tracing a path to her cheek. I licked her soft skin and whispered.

"You're my slave. A female beast who lives only for my cock and semen, offering up her cunt whenever I tell her to, and sucking me off whenever I command."

The raw, degrading description seemed to shock her, making her cheeks tremble even more violently.

[T-That... I shouldn't...]

"Haa, I told you, it's just practice. Hm? Are you going to freeze up like this when you do it for real?"

When I asked her with a sly grin, Undine looked at me with shaking eyes.

[Casano, you're being serious right now... You're... you're really going to make me your bitch...]

Smirk.

"No, I'm not. Didn't you say you were going to contract with Sein? I'm just teaching you how to take care of him and make him feel good, aren't I?"

[I can feel it... My Spirit Core is throbbing... I can feel Casano wanting to grab my throat and force me to suck his cock... ♡]

[I can feel how badly you want to pin down my thrashing legs and plunge deep into my cunt...]

It seemed her ink-colored Spirit Core was indeed transmitting some of my raw desires to her. With absolute certainty in her eyes, Undine trembled with fear as she confronted me.

"Haha... Well, you're not wrong... but I have no intention of forcing you."

[Liar...!]

As she tried to take a step back, I wrapped my arms around her and pinned her against the wall. Trapped snugly in my embrace, Undine looked up at me, pleading pitifully.

[Ah...! No, no more... Ngh... ♡]

Not a chance. I rubbed my cock against her twitching mound, licking her earlobe as I whispered softly.

"I genuinely want things to go well between you and Sein. You know that, right?"

[...I know that's true... but...]

"But if it doesn't work out... then it's my turn, isn't it?"

[Hee! ♡ N-No! Sein is kind!]

"I'm kind too. But why do you think that immature, naive Sein is so nice to you?"

[...That's...]

"It's only because you're a spirit. A tool he can use once he contracts with you."

[No! No, he's not! Sein isn't like that!]

"I know. Humans can read each other's true intentions... But I'm different."

Undine, who had been arguing back, suddenly fell silent and stared up at me. In the suffocating silence, I spoke with absolute honesty.

"Whether you're a spirit or not, I want to make you my bitch. I want to stuff my cock inside you and fill you with my semen every single night, hm?"

[Hngh... ♡ Ah-hn... ♡]

Even in the midst of this, I felt her twitching cunt clamping down on my glans, begging for more. I nudged my hips forward, sliding the head back inside her.

Seeing that Undine wasn't putting up any real resistance, I knew she was almost completely broken.

"I just want Undine for who she is."

[...I...]

"You're the most mouth-watering female I've ever laid eyes on."

[Haa-ah... ♡ Haa, haa... ♡]

As I whispered those words into her ear, Undine felt her body shudder violently, squirting a fresh gush of water from her cunt.

"Think about it carefully. Which path would make you happier?"

[There's no need to think...! I... I'll be happier with Sein...]

Seeing her hesitate, I unclasped my arms and released her from my embrace.

"Tell me whenever you're ready. I can wait."

[I'll never tell you...! Hmph!]

Answering sharply, Undine pulled herself completely off my cock and turned away from me. Feeling a sudden wave of thirst, I licked my dry lips and cleared my throat.

"I'm always on your side, Undine."

"You'll end up choosing me."

When I murmured those words to her turned back, Undine flinched, but she floated away as if she hadn't heard a thing.

I shrugged, pulled up my trousers, and quickly made myself presentable.

I could feel that this crude little drama was finally drawing to a close. If only she had never tasted this pleasure... but now that she had, Undine was bound to choose her own ruin.

Though, of course, that ruin would be the absolute best outcome for me.