Disclaimer: This story is a work of fiction. It contains depictions of fantastical human-monster interactions, body modification, and niche fetish themes (including lactation, pregnancy, and transformation).
Trevor (20 years old) found a slime-like monster in the woods and decided to keep it. He kept feeding it until it grew big. Without his knowledge, the creature started to get hungry for his body.
At night, when Trevor was asleep, the creature’s tendrils began to probe and rub at his sensitive spots, playing with his body. It bound his arms while his legs spread wide in the air, exposing his entrance for it to probe and lick. Laying him on its squishy and cool body.
Trevor awoke when he felt something enter him and saw what the creature was doing. He didn’t resist or run; instead, he watched curiously, letting it roam around his body.
And Trevor let it because he had a kink for this type of sex.
He let the slime inject something into his nipples, making his breast muscles swell, plump, and expand heavily. He realized that it was making him produce milk, squeezing his breasts and nipples and letting it suck his nipples hungrily for the milk through his heavy breasts. Milking him like a cow. Trevor moaned in pleasure, loving every moment of it.
His cock was kept pumped, and his urethra was pierced with thin tendrils, sucking his cum dry, keeping him orgasmic. Then, it filled his urethra with its essence and plugged it afterward.
Trevor kept moaning while letting it thrust its thick tendril inside his ass, stretching him with more of its tendrils, hitting his sweet spot, filling his inside with its essence, and inflating his belly into a baby bump. Saliva dripped from his chin as he enjoyed the pleasure it gave him. His anus swelled and looked like a pussy.
Another tendril was pushed into his mouth, down his throat, and released sweet fluid into him. Little did he know that it was creating something with his body.
A vagina was formed below his pelvis, under his cervix.
When it was complete, the slime pushed its tendril inside his newly formed pussy and fucked him senselessly, filling him with more essence. Trevor moaned more in pleasure.
His butt cheeks had become constantly round, big, and plump. They bounced and jiggled when he moved, making him look more appetizing and inviting for the slime tendrils to grab and penetrate.
Then came breeding. Trevor moaned and cooed as he let it fill his belly and new-formed uterus with its eggs and cum, making him round and bloated. Another kink of his was being pregnant with monster offspring.
Trevor let it plug both his pussy and ass with its vibrating tendrils, keeping him moaning and aroused while keeping the eggs inside him.
Then, it let him go for a few minutes, leaving him in a state of lust and pleasure, a moaning mess, while it went to find food in the fridge. It came back afterward, pulled out the plugs, and thrust its tendrils to fuck him again.
He kept letting it do everything to his body because he was willing and enjoyed it whenever the monster kept double penetrating him.
And he was happy, and the monster also looked happy and satisfied.
When the monster was satisfied and done, it plugged his holes again to keep the eggs inside him. The plugs had their own tendrils and wrapped around his vagina and butt cheeks to keep them intact and shut, like he was wearing a tight thong. And they vibrated inside him, keeping him moaning with arousal.
Trevor, panting and sweating hot, looked at his new self, completely rounded and filled, satisfied, and totally looking sexy, lustful, and sexually inviting through his mirror reflection, especially the plugs on him that had transformed into a tight thong, keeping his holes shut.
He stroked his rounded belly while also squeezing his now plump breasts, making them lactate with milk. He exposed his now big, plump ass that looked inviting and hungry to be grabbed and humped in satisfaction before he stroked the monster tenderly and willingly to be a mother for this monster’s offspring.
He then fell asleep with his slime, feeling the coolness of its body.
He woke up the next day, moaning and sweaty from the continuous vibration of the plugs in both his anus and cunt. He then looked at himself and saw his full and round belly, thinking that what happened last night was not a dream.
He hummed in satisfaction and continued his day with new sensations.
He would walk around the house, doing his work while carrying his round belly that was still filled with eggs inside him, caressing it tenderly. His heavy, plump breasts were sealed with the slime-shaped milk pump to ensure he didn’t waste the milk. And he unconditionally swayed his hips, showing his plump butt around as it bounced and jiggled.
When night came, he would give birth to the eggs with his monster partner’s help before the slime got a taste of his body again and filled him with another set of eggs, always keeping him pregnant and always leaving his both orifices plugged shut. And it continued every day, with Trevor never getting tired of it.
Whenever he needed to go outside, the slime would wrap all over his body like a second skin, latching and piercing thin tendrils inside his nipple buds and thrusting thin tendrils inside his nipples, making them vibrate and throb, stretching them open while another sucked the leaking milk from his heavily milky breasts.
His holes were also not spared; the plug-shaped tendrils vibrated lustfully, electrifying his inside, keeping him in pleasure and arousal while still keeping his entrances shut to prevent the eggs and essence from escaping.
Trevor was enjoying this while keeping his moaning voice steady, enduring the pleasure in public. Yet he loved every bit of it.
One day, while he was at home, his belly still full of eggs and his holes still plugged and vibrating while the tendrils wrapped around his pussy and plump butt cheeks to keep the plugs intact, and his plump breasts were kept pumped with milk, Trevor felt a little empty and decided to experiment with something on himself.
He asked the slime if it could plug his mouth with its tendril, deep-throating him.
The monster complied happily and produced a mask-shaped tendril, gagging his mouth like a face hugger, giving him a deep kiss while also filling him with its essence. Only when he needed to eat, drink, or go out would the tendril release his mouth upon his signal.
Another day, whenever Trevor finally got some rest, his belly was flat and empty from eggs for once, but his plump breasts weren’t given a chance to rest when he had to nurse the hatched offspring with his milk. They latched like a milking pump, and he enjoyed every bit of it, happy to feed his babies.
When the babies were full and asleep with their slime father, leaving his still lactating milk leaking, Trevor would use his milk pump machine and fill his milk into bottles to sell, making money out of it.
Sometimes, he and the slime would do a different position to make his body more comfortable.
It shaped itself into a large beanbag cushion, and he would lay on it, feeling its smooth, squishy, and cool body. Then, it spread his legs wide again and bound him before pushing its thick tendril into his pussy and anus, thrusting in and out, then laying an egg inside his belly again.
His breasts were already expanded and being stimulated, sucked, and pumped. His hips were up high, and his big, plump butt cheeks moved up and down, making him look more sexy and appetizing.
Trevor enjoyed every kind of sex position the creature wanted him to do. Whether it was doggystyle, riding on the slime while his arms were bound upright, or his body was laid on the slime’s cool body while his legs dangled up, spreading for it, presenting his plump ass and cunt for the monster, Trevor enjoyed every moment of it.