The Collar of the Succubus
After finishing the morning sex that had become our daily ritual, I saw Master off to work and headed down to the underground city. I passed through the security check at the Glass Garden, took the elevator down, and arrived at Faust’s laboratory.
“Kyubey, you’re here~ Come along. We’ll start with a detailed examination.”
“Yes.”
The moment I entered the lab, I followed the researcher’s instructions, stripped off every piece of clothing, and stepped into the glass cylinder. A transparent liquid filled the chamber, and as I floated weightlessly inside, cables snaked forward and connected to the ports on my body. The familiar sensation of my brain being read washed over me, and my consciousness powered down.
When I opened my eyes again, I was curled up and floating inside a solution. Blinking, I looked around to see researchers manipulating holographic PCs and chatting among themselves.
“How much has Kyubey’s magic core grown?”
“Hmm, she only reached maturity recently, yet it’s already this large.”
“At this rate, we’ll need to perform the engraving ahead of schedule.”
My body still wouldn’t obey me, so I could only listen in a daze. One of the researchers spoke directly to me.
“Kyubey, can you hear me? Your magic core is growing far too quickly, so we’re going to engrave it early. It’s going to hurt a lot, but you’ll have to endure it.”
After speaking, the researcher operated a console. A mechanical arm seized my legs and spread them wide, then inserted an expanding speculum into my vagina and opened it. The cold metal device forced its way past my folds and pried open my cervix. The pain was intense, yet my body still refused to move. Something inside the device that had entered my womb approached my magic core.
It was an organ so vital to a succubus that it could be called a second heart. Instinctive terror surged through me, but I endured it in silence. The device positioned itself, gripped my magic core firmly, and drove a spike into it.
Aaagh! It hurts so much!
The agony surpassed anything I could have imagined. I wanted to scream, but my body wouldn’t respond, so I could only shriek inside my own mind. The spike that had pierced my core stopped moving and began injecting something. Whatever had been placed inside my magic core extended tendrils, drilled new holes, took root, and started devouring my vital energy.
The sensation of being eaten alive from within my most important organ sent a chill down my spine. It was utterly horrifying.
“Calm down, Kyubey. QA received the same procedure. When a succubus’s magic core grows too large, the instinct to devour vital energy becomes overwhelmingly strong. It puts humans at risk, so we install a control device.”
The researcher must have read my fearful thoughts, because he began explaining the procedure.
“Before QA underwent the treatment, she would occasionally get so excited that she nearly killed people by draining their energy. The parasite we implanted inside your magic core absorbs vital energy from within, preventing the core from growing beyond a certain size. That’s how it controls the urge.”
So Mother had been feeling this sensation the entire time? The presence of a parasite embedded in my magic core constantly brought pain and the threat of death.
“As long as it absorbs energy at regular intervals, there’s no danger to your life. Given your personality, Kyubey, I suspect you’ll end up enjoying it.”
The researcher smiled as he manipulated the holographic PC. At that moment, I felt my brain being prodded. Ouch, please don’t change too much.
“Don’t worry. It’s fun to tinker with the brain, but the delicate areas require care. There. How do you feel now?”
The terror of having my vital energy stolen by the parasite vanished, replaced by an intense wave of pleasure. The realization that I was being treated as an experimental subject filled me with happiness.
Haa… It feels so good.
“Having direct control through the brain implant certainly makes things convenient. We don’t need the complicated brainwashing we used on QA. We can adjust her in real time.”
“Don’t mess with her too much. We don’t know what side effects it might cause the test subject.”
“I know, I know. She’s the director’s favorite specimen, so I’ll be careful.”
The researcher operated the PC again, and my consciousness faded once more.
When I woke up, I was cradled in Mother’s arms while she gently stroked my hair.
Huh? Is the examination already over?
“Oh~? You’re awake~?”
“Yes, Mother. Is the examination finished?”
“Mhm~ My daughter finally has a collar around her neck~ Congratulations~”
“A collar?”
“The parasitic creature embedded in your magic core, of course~ You’re now completely subordinate to humans as an experimental subject~”
From the magic core inside my womb, waves of pain and pleasure continued to radiate. It was still devouring my vital energy. Yet for some reason, I no longer felt any fear.
“Why didn’t you tell me in advance?”
“Sorry~ I didn’t expect my daughter to grow her magic core so quickly~ How does it feel to have a parasite inside your core~?”
“It was scary at first, but now I can’t feel the fear anymore.”
“Hehe, the researchers are so kind, aren’t they~?”
Mother explained that the parasite’s purpose wasn’t simply to steal vital energy. Faust had also installed it as a safeguard against test subjects escaping. It could track their location as well.
“The parasite produces vital energy crystals through the hole in your magic core~ You just need to store them inside your womb and hand them over to the researchers~ They use them as materials for their experiments~”
Mother smiled happily as she kneaded my lower belly. She seemed genuinely delighted that I had become a fully subordinate experimental subject for humans. As expected, Mother’s brainwashing ran incredibly deep.
Still, a creature that parasitizes a succubus’s magic core and steals her vital energy… Was something like this originally a real organism?
“Did this kind of parasitic creature exist before?”
“Faust created it in cooperation with the Chimera Research Lab~ All for the sake of us succubi~”
“Location tracking and vital energy crystal production… It really is a collar made for livestock.”
“Exactly~ It’s also a device to prevent our kind from going berserk, so you should be grateful~”
“Yes, Mother.”
More importantly, having my vital energy continuously devoured by the parasite had left me feeling hungry. Since I had always been surrounded by abundant energy, this was the first time I had ever experienced hunger caused by its absence.
“This is the first time I’ve felt hungry since becoming a succubus.”
“It won’t kill its host~ It will stop once your energy reaches a dangerous level~”
“How fascinating.”
While enjoying Mother’s gentle caresses, I closed my eyes and shifted my consciousness toward my womb. Using the vision granted by my tentacles, I looked at the magic core inside the uterus crowded with larvae. A hole had been forcibly drilled into its center and held open by a fixation device so it could not heal.
Ah, so that’s why it couldn’t repair itself.
A tingling thrill ran through me at the sight of my precious organ being forcibly modified. I peered into the hole. At the center of the purple magic core sat a black slime-like creature, clinging tightly as it absorbed my energy. It had driven tentacles made of mucus into the core, riddling it with tiny holes. My magic core was helplessly surrendering its vital energy.
Ugh, seeing it directly is pretty horrifying.
Wondering if I could connect nerves to it like I did with Slime You, I extended a tentacle and made contact. Instinct told me it was possible. As I began the process of linking nerves, the black slime wriggled and wrapped its mucus body around my tentacle. Since it was a small slime designed to fit inside a magic core, its intelligence seemed quite low.
When I focused and completed the neural connection, I sensed a faint consciousness. Comfort. Satisfaction from abundant food. Curiosity and fear toward something new. The slime’s intelligence was more instinctual than a child’s—closer to that of a baby.
Hello, little slime.
When I sent the thought through our linked nerves, the slime froze for a moment, then cautiously slowed its absorption of energy as if testing me. It retracted the mucus it had driven into the core like roots, curled up, and rubbed itself affectionately against my tentacle.
Don’t be too scared. I won’t hurt you.
As I soothed the black slime and examined it further, I realized they had modified it to limit its diet exclusively to vital energy. Its tiny core had been dyed the color of my own energy—soft pink. The energy it consumed seemed to be condensed into crystals within the increased mucus as it grew.
Instead of letting the slime grow larger, they had engineered it to inject energy, create crystals, and expel them. The technical prowess of the Chimera Research Lab was astonishing; I had felt the same way when they created the dairy cow slimes. If I raised this child, it might even be able to store vital energy beyond the capacity of my magic core.
Hmm. To increase its intelligence, I should do what Master did…
Imitating the way Master had raised Slime You, I guided the growth of the black slime. While I worked, the slime that had been curled up and watching me warily drilled a new hole into the now-healed magic core and began feeding again. A stinging pain spread through me as the hole was reopened.
The slime’s simple emotions of joy at finding delicious food were both ridiculous and strangely cute.
Don’t make too many holes. Make larger ones on both sides and spread out like this.
The slime wriggled hesitantly before following my instructions, creating bigger holes on either side of the core than before.
Ouch. It still hurts.
Good. Now extend thin, dense tentacles from there to anchor yourself. There’s no need to keep making new holes.
The slime obeyed my teaching, settled stably into the magic core, and focused solely on feeding. Whew. At least I won’t have to feel the pain of new holes being drilled constantly anymore.
Leaving the now-stable black slime behind, I shifted my consciousness again. Mother was nowhere to be seen; I was lying alone on the bed. When I left my room and entered Master’s, I found both her and Mother there.
“I’m back.”
“Daughter~ You’re awake~?”
“Hngh… Kyubey, you’re here?”
Both Mother, who was sitting in a chair, and Master, who stood beside her, were completely naked. Mother’s tail was buried inside Master’s vagina, teasing her, while a fully bloomed yin crest glowed on Master’s lower belly.
Wow, look at all that concentrated vital energy. It’s incredible.
“I handled everything on the surface without issue. Did you both get along well while I was gone?”
“Mmm, I was fine. QA took care of my body for me.”
“Ufufu~ We’re such close friends, after all~”
As Mother’s tail slid in and out, stimulating her, Master’s flushed face melted even further with pleasure. Feeling a sudden surge of jealousy, I clung to Master’s body, grabbed Mother’s tail, and yanked it out.
Pop!
“Ahn!”
“Master’s pussy belongs to me!”
“Ehh, daughter, that’s so mean~”
I partially released my transformation and slid my own tail into Master’s vagina. It felt wonderfully tight yet perfectly accommodating, the walls clinging to me with just the right amount of give. Aha, so this is what a pussy feels like.
The pleasurable sensation transmitted through my tail made me unconsciously thrust harder. Squelch, squelch.
“Aang! Kyubey, that’s too rough!”
“Ah, I’m sorry, Master.”
Even though it was soft, my tail was made of muscle and bone. I must have thrust too vigorously. Remembering how Master’s cock moved, I began moving my tail more gently, stroking the inside of her walls. A sweet moan escaped Master’s lips.
“Huu… Yes. Gentle like this is much better.”
“Hehe, I learned it from Master. How about here? Does it feel good?”
“Haaang, yes…”
While I toyed with Master, my body didn’t become physically aroused without Master’s pheromones, but I could still feel pleasure through mental excitement. After bringing her to orgasm once, I asked the now-relaxed Master a question.
“By the way, how is the information gathering going?”
“It’s going well. I’ve also received command documents and data from the Chimera Research Lab. Take them with you when you leave.”
“Understood, Master.”
Master continued moving with my tail still inside her, looking completely accustomed to the situation. While my tail was pulled along by her movements, I spoke to Mother.
“Mother, exactly how did you train Master? She seems completely used to walking around naked with a tail in her pussy.”
“Just~ made her obedient to pleasure~”
“Ugh, stop training her already. You’ve turned a perfectly normal person into a pervert.”
I had already been worried because she was so weak to pleasure, and now she was completely broken. Meanwhile, Master, who had taken clothes from the closet, spoke up.
“Take your tail out now. I need to get dressed.”
“Yes, Master. But first, let me have some energy.”
“Sure, eat up.”
I sucked the abundant vital energy from her yin crest through my tail. I drank the delicious strawberry-flavored energy until the glow of the crest faded. My hunger disappeared, replaced by a pleasant feeling of fullness.
Huu, I’m full.
“Hiiit…”
“Thank you for the meal.”
I embraced Master, who was trembling and climaxing, patted her belly gently, and thanked her. When I pulled my tail out of her vagina, thick strands of love juice stretched and sparkled. I wagged my tail playfully while watching Master get dressed.
“How was it~? Maria’s energy tastes good, right~?”
“Yes, it was excellent.”
“Maria is top-grade food, after all~ Engraving that yin crest was a good decision~ Take good care of her~”
Even though Mother and I were openly treating her like livestock while watching, Master paid us no mind and simply put on her bra. Wait… I hadn’t noticed because I was used to large breasts, but Master’s chest had grown enormously.
“Master, your breasts have gotten so much bigger?”
“I got Slime You back. It’s still growing.”
“Did you get Tiriel back too?”
“Yes. Want to see?”
When Master touched the transparent tip of her tail tentacle, Tiriel’s tentacle emerged from her anus. The slender tentacle, about the thickness of a finger, rubbed affectionately against Master’s cheek before turning toward me as if sensing something. As Tiriel tapped my abdomen curiously, Tia slowly emerged.
“Huh? Kyubey, what’s that tentacle?”
“It’s Tia. Tiriel’s child.”
“That egg actually hatched? How interesting.”
Tia, even thinner than Tiriel, recognized both me, her mother, and Tiriel, her father. Through our nerves, I felt Tia’s joyful emotions. As the two tentacles wrapped around each other, Master’s and my bodies were drawn even closer together.
“This is kind of funny. Tentacles coming out of each other’s anuses are wrapping around and rubbing against one another.”
“They’re father and daughter. It can’t be helped.”
Since we had to stand facing each other until the tentacle family finished their reunion, I decided to play with Master’s breasts. With Slime You inside them, Master’s breasts had undergone another explosive growth spurt and were preparing to produce milk. I kneaded the much larger and heavier mounds with both hands.
“Master, you’ve willingly turned yourself into a dairy cow again. You have a yin crest engraved to gather energy for us succubi, and you produce milk for humans. You really are like livestock being raised. Hehe.”
“Hey! How rude, Kyubey!”
Master swatted my hands away from her breasts and pouted adorably as she stepped back. Still, she didn’t deny being compared to livestock.
“Do you really think of yourself as livestock now? When did Master become like this?”
“Hmph, shut up. I’m changing clothes. Be quiet.”
“Yes, Master.”
Master seemed to be shrinking in stature, and somehow becoming cuter because of it. It felt like I had become a servant attending to an adorable young lady. I had liked the original flawless, willful Master, but I liked the current version even more.
“How is it~? My masterpiece~?”
“Masterpiece?”
“It took a lot of work to turn her into such an obedient and cute young lady~ Praise me~”
“It’s better than I expected. You did well.”
“Hehe~ Should I just train her to be your daughter’s slave~?”
“No. Maria will always be my Master.”
From the moment we first formed our symbiotic bond until the moment she tamed me and turned me into an Abaddon Angel, every memory was precious. I had no desire to reverse that relationship and make her my slave now.