The last few twitches of Nyx’s cock released a little more cum before she finally pulled her pet off the still turgid shaft. For a moment, she let Lidia sit on her knees, her body still twitching and her eyes rolled back from how many orgasms had been forced through her. Cum and saliva drooled out of the corner of her mouth. She hadn’t even fully swallowed the load that had filled her cheeks.
A soft moan gurgled up before Nyx’s pet closed her mouth and gulped the thick spunk down. She leaned forward, catching her breath with deep gasps. Her mouth was still a mess, dripping thick white fluid onto the carpet between them as she braced herself on her hands.
Lidia could feel the magic of her mistress’ spunk flowing not just into her tummy, but throughout her body. The hem of her shirt was riding up over her swelling ass and widening hips. She could feel her muscles twitch and writhe under her skin. Said skin was darling slowly before her eyes. She had been told she was going to get a preview, and it was already happening. Her tits plumped and hung further down, filling her already tight shirt.
The changes were happening, but they were going slowly. She mewled out, her half delirious gaze rising up pleadingly to her mistress, “P-please… Mistress… more… mo…more…”
Nyx grinned and stood, pulling Lidia to her feet before turning her around and bending her over the desk. Lidia’s tits squished down onto the space between each of their computers, her hands gripping into the smooth surface while she felt the heat of her mistress’ cock slide between her ass cheeks.
“First, I’m going to clean out your insides. I’m going to make this ass perfect for fucking.” Before her pet could say anything, Nyx buried her cock between those slowly swelling cheeks.
Her pet squeaked a surprised yell as she found herself filled with a cock that should not be able to fit in a human body. Sure, it had already fit down her throat, but it was just as shocking the second time. Mistress Nyx’s hips slapped against her growing ass before pulling back.
As another wet slap filled the air, Lidia felt a strange churning inside her. The cum inside her tummy and the warmth slowly curling through her lower intestines was doing something to her. The voice of her mistress tickled her ear, giving her the answer.
“Succubi only produce waste if it's for a sexual purpose. Since most don’t have those sorts of kinks, there is no need for you to have any of that nastiness inside you. When I’m finished, rimming your little ass will be like licking a plate clean rather than a toilet bowl.” It was weird how, despite saying such words, or maybe even because of it, Lidia felt her libido rise.
But there was something she needed to know, a curiosity that cut through her lust. “But what… what if… eat. Want to eat?”
A smokey chuckle rumbled Lidia’s brain. “We process it different to humans.” Nyx licked her pet’s neck up to her cheek before dropping the bigger news, “While the rest of you is still going to be human till you fulfill your duty to me, this change will remain permanently. You can survive just as well off of sex alone as you would a proper meal. Yes, that means guzzling cum like the cock slut you are counts.”
The very thought of being a sexual toy even if she were to somehow fail and end up stuck as just a human pushed Lidia over the edge. Whatever mental faculties she had before were lost to her pleasure.
That and the continuing transformation of her body. Pops and then tears reached her ear before her skirt fell to the floor. Her stockings had completely turned to a mess of mangled threads. Her shirt, the last article of clothing on her body, wasn’t long for this world as her once 5’5” frame filled out up to and starting to inch past 6’. While nothing compared to the amazon woman that was her mistress, Lidia could see her arms filling the sleeves of her shirt, bicep flexing larger and larger, pulling the seams taught more each time. The skin of her forearm darkened and reddened more into something closer to a maroon as her nails turned into claws, gripping hard and tearing the surface of the desk. She could feel fangs forming in her mouth while her horns continued to grow. They curled around, taking a shape similar to a ram’s.
And then her body was filled again with her mistress’ climax. The powerful succubus once more continued to thrust, churning the cum rather than just pressing in and letting a few small spurts fill her ass. Instead, it was a pressure that was pumped in though her organs, the flow reaching her stomach. The curious thing that really hit her brain was the sense of purification.
It was beyond unexpected. Wasn’t a succubus a demon? Weren’t they corruptive? And yet, that was the feeling of the cleaning effect of her mistress’ cum. Her body truly was being made to be fit for anyone’s use.
As her shirt turned to confetti, Lidia’s mistress slowed down her pounding thrusts, moving her hips around to stir up her insides, causing Lidia to quiver and cum. More lady spunk washed down her legs, this time covering her mistress’ thighs too.
Nyx purred leaning over, letting her tits press against Lidia’s back. “Now, if I were to go ass to mouth, all you would taste is our love making. As it should be for a succubus.” She nibbled on her pet’s ear for a moment before continuing. “But of course, we aren’t done.” She pulled out and teased her cock over Lidia’s pussy lips. “We still have the main event.”
Something was different about the feelings when Mistress Nyx’s cock filled Lidia’s pussy. Yes, there was stretching. And sure, with how massive it was, Lidia wouldn’t be surprised if Mistress Nyx actually impaled her cervix and was fucking her womb directly. The sensations were too much for her to be sure what was really going on physically.
But metaphysically? Something shifted. Something irrevocable. An instinctual knowledge filled her mind. Lidia suddenly knew she would not fail her mistress. Becoming a succubus was inevitable. But the more power she had at the end of the month, the closer to her mistress she would be in strength.
Something else also teased her thoughts. An idea that blossomed to its full with her mistress’ words.
Nyx also felt the shift in her pet. “Yes, you can feel it, can’t you? That sudden realization that you can use that magic you gathered to transform others. Some temporary, some permanently. I can see it in your mind. You just imagined causing our ‘boss’ lady to grow a massive cock for you to ride, didn’t you?”
Her pet mewled out a soft ‘yes’.
“The more you change others, the less magic you will have at the end of the month. But at the same time, the more you change others, the happier you make me,” Nyx kissed her pet’s cheek before speaking a name, Dawn.“
L-DAWN felt that something grew right at the same time her mistress came into her womb. Magic gripped every cell of her body and soul. Yes, her body would turn back to human, but the permanent changes were complete. She was, or rather would be, a full succubus. She felt the last few pushes of her growing body ebb away while her tummy swelled with her mistress’ massive load. She felt the new name settle on her at the same time of a collar clicking around her throat.
As she touched it, feeling it was real, Dawn found her mistress laying back on her again, her still smaller form pressed into the desk top. “Mmmm, contract complete. I order you to have fun tonight. Go to a club or whatever, find people to fuck. Offer yourself openly. Your magics will protect you from any that would stop you.”
Dawn could already feel her mistress’ cock shrinking for the first time since they started this marathon sex. “What about you, Mistress Nyx?”
Nyx’s body began to shimmer, “The contract is complete. So, for now I will return to being Danny.” As she said so, her body floated up toward the ceiling and faded away.
Wed Dec 24 14:22:56 2025