The Monstergirl Satiety Project 1

The Monstergirl Satiety Project

The offer - The motivation

The sun stood high, and the small garden of the Kurusu house buzzed with the chorus of cicadas. In the living room, the usual chaos reigned: Mia had blocked the couch with her tail, Papi was lying upside down in the armchair trying to catch a bag of chips she had tossed into the air with fluttering wings. Suu slid cheerfully across the floor, sucking up everything that looked like liquid, while Mero sat enthroned in the bathtub, dreamily listening to a melodrama audiobook.
Rachnera was presumably, as so often, hanging in her big web in the attic and knitting or reading, while Lala was either in her own room or out doing things that, as a so-called “envoy of death,” were her mysterious duty.
Amid the relaxed hustle and bustle of all the residents, only one seemed a bit out of place that day: Centorea. The centaur stood bolt upright in the corner, arms crossed, gaze sternly lowered, as if she could call herself to order. Her enormous, soft breasts strained heavily under the white blouse and spilled over the forearms of the pretty centaur. Her long blond hair flowed down onto her horse back, and her ears drooped a little in dejection. One might almost have thought she was deliberately forbidding herself any fun or distraction, because she considered it dishonorable or the like.
“I swear, these… these frivolous habits are corrupting my mind,” she muttered, trying to ignore Mia’s giggling cuddling with Kimihito. He was doing everything to free himself from the coils of the lamia’s strong tail, and he seemed to be running out of air.

The man of the house himself—Cerea’s master—was as always kind, striving to do right by everyone at once. He laughed when Papi scattered the chips all over the carpet, patted Mia soothingly on the head after finally freeing himself from her grip, and then got up to bring fresh tea to Mero.
And Cerea stood there, her heart heavy, her face flushed because he didn’t look at her even once. She wanted to be the only one for him, but every seduction, every flirtation, every suggestive innuendo conflicted with her pursuit of honor and dignity. Besides, there was so much damned competition for her in this house. Even after all this time in which the monstergirls under Kimihito’s care had basically all become friends who meant something to each other, the envy gnawed day after day at the proud centaur because she had to share her beloved master with other women.

The doorbell snapped everyone out of their routine—and above all, it snapped Cerea out of her thoughts.
A black Cadillac parked in the driveway, and Ms. Smith stood at the door. Sunglasses, coffee cup, and a smile that was as inviting as it was calculating.
“Hello, everyone,” she said casually. “I hope I’m not interrupting… uh… housekeeping.”
“Ms. Smith?” Kimihito frowned. “Why are you—?”
“Actually, I’m only looking for one person. And for once, it’s not you.” Smith’s gaze wandered through the room and came to rest on Cerea. “Our noble knight. Would you have a few minutes for a conversation?”
Cerea stiffened so much it set her big tits wobbling. “If this is another… indecent undertaking, like last time when you wanted to force me into a centaur swimwear photoshoot—” she began, blushing bright pink, but Smith interrupted her.
“Don’t worry.” Smith stepped into the living room and, without invitation, sank into a free armchair. “This time it’s something more serious. Something that could change the world.” All the women and Kimihito looked at the agent curiously; only the centaur lady looked skeptical.
“What is it about?” Cerea asked distrustfully.
Smith slurped her coffee, then took off her glasses. She cleared her throat and began to explain: “We’re working on a new feed. A concentrate specifically developed for liminal species with ungulate anatomy—centaurs, minotaurs, etc. The goal is to combat malnutrition in regions like Africa or the Middle East. Less food, but better nutrient absorption. Sounds good, right?”
“You want to make me… a test cow?” Cerea stamped, indignant and upset, with a hoof. Again her big breasts bounced up and down, which she didn’t notice. The blonde centaur glared at Smith, and the redness in her cheeks spread over her whole face.
“The correct expression would be guinea pig and, in your case, more like test horse rather than a cow, but we’re not allowed to say either so as not to step on any species’ toes. A test subject, but basically yes, correct,” Smith corrected and confirmed imperturbably.
“We need someone strong enough to withstand the effect. The formula ensures that your body almost completely utilizes nutrients. Nevertheless, after all lab tests, it’s been classified as completely harmless. At most it can become somewhat… burdensome, that’s all. At first that means: you need less food. But in the long term… the hunger can also increase. And with hunger—your body.”
“That is… against every knightly honor!” cried Cerea, cheeks furious, head red as a tomato, her ears twitching violently. Her blond tail also lashed back and forth in agitation.
“I will not… let myself be fattened like a breeding animal!”
“Oh?” Smith stood up. “No one ever said anything about fattening, and we don’t intend to do that. How much you eat would still be up to you. Of course, in the long term some weight gain is likely, but that wouldn’t be the end of the world.” She walked past Cerea with a conspiratorial grin and motioned for her to follow.
“But since you bring that up, we’d better talk under four eyes.”
Sullen and reluctant, Centorea began to trudge after the agent. The two women went into the centaur’s room, and Smith closed the door behind them. Then she took a smartphone out of her bag and tapped on it.
“What are…?” Cerea began, but the agent immediately held the phone under her nose. Cerea’s eyes widened, and her face grew even redder and hotter, if that was even possible.

There were countless pictures and videos, all with… rather special, explicit content.
“W… what is this?” Cerea stammered.
“Kimihito’s phone,” said Smith casually. “And his PC. Or rather, data from them. You can surely imagine that we have a few little… security protocols to make sure Kimihito always… stays within the bounds of the law.”
The first picture showed a lamia—but not like any Cerea had ever seen. Her hips were twice as wide as Mia’s, for example, her belly soft and hanging over the skirt, massive, jiggling tits, and fat rolls everywhere. Another picture: a minotaur woman so voluptuous she could barely fit through a door. Then screenshots from forums, subfolders with names like “centaur_thicc” and “goddess_soft.” Videos of utterly fattened mermaids whose force-fed hanging guts drifted lazily in their pools. Ogre women shoveling endless amounts of food into their already overstretched, taut bellies. There were simply countless files of all kinds of monstergirls, and all of them were fat or getting fatter.
Cerea felt her heart stumble. “That… that can’t be…”
“Oh, but it is.” Smith’s smile sharpened. “Your dear master is into voluptuous, fat monstergirls. That’s why he’s resisted all the flirtation attempts. He’s waiting for one of you to transform—into exactly what he wants.”
Cerea’s cheeks burned. Her hands dug into the fabric of her blouse. “Then… everything… all my training… my discipline… was in vain?”
“Not in vain,” said Smith. “But useless, if you want him. With this project you can do two things at once: help the world—and win his heart.”

Cerea staggered back and sat down heavily on the couch. Her head swirled with crazy, far-fetched thoughts.
My life… all those years… I fought to be strong, noble, disciplined. And he… he never paid attention to me.
Smith’s voice cut through the thoughts. “Imagine: you, bigger, softer, more magnificent than any centaur before you. And Kimihito looking at you—not just as a knight, not just as a housemate, but as a woman, the way he desires in his deepest heart.”
Slowly, Cerea raised her head. Her eyes shone, and a feverish glow entered her gaze.
“If… if that is the path… then I will walk it. For the hungry. For science. And…” She blushed again, as fiercely as before, “…for him.”
Smith nodded, satisfied. “That’s the right attitude.”
“But!” Cerea raised a warning finger. “It shall happen in moderation! A knightly goal, not… wanton excess!”
Smith looked at the centaur with a mixture of amusement and doubt. “You just have to take this agent and eat; we’ll collect all the data we need. What you yourself make of the effects of this agent, and whether the forms Kimihito actually likes can be reconciled with your honor and your code and your standards for your body…” Smith shrugged. “Is up to you.”
Cerea bit her lower lip and thought feverishly. Images shot through her head of lamias, harpies, and arachnes all grotesquely fat, just as Kimihito apparently found attractive. What an incredible amount Cerea would have to gain to reach that ideal.
Then Smith pulled a small bottle from her jacket pocket, drawing the centaur’s attention back to her.
“If you’re ready for it, we can start right away.”
Cerea hesitantly accepted the little bottle. Her hands trembled, but then she thought of the love burning in her heart beneath her ample breasts for her master Kimihito.
“For you,” she whispered—and downed the contents of the small bottle in one go.
A hot glow spread in her belly. She gasped, laid her hands on her abdomen. “It… it feels like fire…!”
“Don’t worry,” Smith said calmly. “That’s just the metabolism. Your body is now absorbing everything. Even things you would previously have excreted.”
But Cerea already felt it: a heaviness, a warmth, a gurgling she had never known. And beneath it—hunger. A hunger that came so suddenly it made her tremble.
Before anyone could react, Cerea grabbed a fruit basket she had previously brought into her room and devoured two apples.
Smith left the room smiling, and the centaur set upon the rest of the fruit. Presumably the kitchen would be Cerea’s next destination immediately afterward. Smith could imagine what an unbelievable hunger had now been unleashed in the centaur’s stomach. It wouldn’t be long before the proud warrior would be drawn to things far fattier and richer than fruit. The agent took a small booklet from her jacket as she walked through the living room and said goodbye to the bewildered residents. Outside, she wrote in her notebook with satisfaction: “Perfect reaction. Better than I’d hoped.”

Later, Cerea stood alone at the window of her room. Her belly was heavy, round, pleasantly taut under her blouse. She laid both hands on it, closed her eyes, and breathed deeply. She had made a veritable foray through the house, from the pantry to the kitchen and back. She had never eaten so much in her life, and in a way she was embarrassed by it. On the other hand, she could already feel the hunger growing inside her again. Was that the normal effect? Smith had said increased hunger might come later. A slight worry crept over the blonde centaur as she massaged the full swell in her otherwise slender and well-shaped human belly.
“If this is my path… then I will walk it. For the world. For science. But above all… for you, Kimihito,” she then said firmly to herself, for she had made up her mind and would stick to it