Safu is a young Mousetaur girl, approximately eight years old by human standards. Mousetaurs are anthropomorphic mice that have the lower bodies of large feral mice instead of legs. Their bodies are plump and curvy, with enlarged curves and generously proportioned endowments. They sexually mature extremely fast, able to breed as soon as they are born. Mousetaurs have massive male endowments that are extremely sensitive and vigorous. Mousetaurs also have energetic female endowments, and often sport multiple pairs of breasts. Mousetaurs are hermaphrodites and are hyper-sexual and grow to enormous hyper-endowed sizes. In truth, mousetaurs have no limit to how fertile or virile they can get, and can breed with anyone and make anyone pregnant. 
Safu has just turned eight years old and is having a birthday party. Her puberty has made her horny, sweaty, and rapidly gaining weight. All her friends from school are at her party, and their parents are too. Safu's powerful musk makes all the parents dazed and slow to react, and no parent wants to get involved with what Safu is doing with their cubs. Safu is sincerely innocent of what she is doing and how she is growing. 
Safu is sitting on her friend, Taiku's lap while Taiku plays with her chest and her endowments. Safu's boobs have swollen out and grown much larger. She is excited by Taiku's hands and feels herself get wet with excitement and arousal. Taiku is becoming increasingly excited by the girl's new growth, and his erection is throbbing and grinding into Safu's backside.
Taiku's parents and his younger brother are watching their cubs playing with each other. They have not noticed Taiku's erection and that it is pressing into Safu's backside. Their arousal is making them slightly sluggish and oblivious, but Taiku's erection is so thick that Safu is noticing it.
Safu is grinding back into Taiku, trying to feel his erection in her crotch. She knows he can breed her and she'll give birth in minutes if she's quick. She feels Taiku's hand pull at her breasts, and Safu's boobs have grown out and swollen. Taiku pulls Safu's nipples and they are both excited by how much Safu is growing.
Taiku's erection is so large that it is sliding down Safu's back. His erection is sliding against her bottom and he can't take it anymore. He slides his erection forward and thrusts into Safu from behind. Safu squeals in excitement as she feels his erection sliding inside her, filling her with pleasure and heat.
The adults are still slow to react. Safu is on her friend's lap with his erection deep inside her. They both look over at Taiku's parents. His father looks slightly confused but his arousal is apparent. Safu's musk has changed Taiku's family to be okay with breeding and hyper sex.
Safu is humping back onto Taiku's erection, grinding back into him as he fucks her from behind. Her arousal has changed the adults and she is fucking the young cub without any remorse. She squeals as she feels his penis rub against her deepest spots and his hands play with her massive chest. Safu is so excited that she orgasms quickly. She is cumming onto the floor, and Taiku's erection continues thrusting into her, hard and strong. Safu orgasms over and over. Her arousal is making Taiku orgasm, and she is flooded with his cum. Safu continues orgasming as his semen fills her, and her breasts grow even larger as she becomes pregnant. Extremely pregnant. Her and Taiku's offspring growing inside her weeks by the second. 
Taiku doesn't stop cumming or fucking Safu - until she begins to give birth. Their Mousetaur cubs pushing down her pussy passage and against their father's young huge cock. Safu continues to orgasm and her breasts grow even larger. Safu gives birth to her large offspring in minutes. She births large amounts of milk as she orgasms and it covers the floor, filling the room with the smell of sex. Safu's mother finally notices, and rushes in to see her daughter birthing her young. Safu's mother is startled and frightened by the huge pregnant cubs being born, and by Safu's enormous bust that's grown while she gave birth. Safu is exhausted but orgasmic as she births the last of her offspring. She births several dozen young mousetaurs, and she is exhausted and aroused at the same time.
The mousetaurs of Safu begin to gleefully merge with the other party guests. They press their bodies against their chosen mates and their bodies begin to merge and fuse. Young mousetaur hermaphrodites adding themselves to the bodies of furry cubs of all ages. The parents have fallen under the musk of Safu's arousal and have become dazed and hyper-horny. Their bodies are pressed against the children of Safu's friends, and their bodies are merged with the mousetaurs, becoming hybrids. Cute mousetaur heads next to their cub friends. Furry tails replacing the fur of the adults.
The party is over and Safu and her friends all leave, happy to have seen Safu's amazing party. Taiku and Safu's parents are still confused by their dazed and slow behavior, but they don't question it and continue to allow the party to go on.
As the party begins to end, the cubs of Safu begin to grow. Their growth is rapid and sexual, and their breasts swell as their bodies become even larger than the parents. Their endowments increase rapidly in size and the young hybrids' mothers are unable to control them. They quickly change and fuse together with their fathers and mothers, merging them into huge busty cubs and creating new hybrids that are much more sexually active.
***
A mousetaur trots down the neighborhood block. It is extremely large, and has an enormous bust that it is very proud of. Its erect penis is visible through its pants. The mousetaur walks to a nearby house, and rings the doorbell. It waits outside for a few minutes, and then hears the door unlock and open. It is greeted by a young boy and a young girl. The boy and the girl's father walk over, and see the huge mousetaur's massive bust. The young mousetaur's penis is erect and throbbing, and the three humans are staring at the mousetaur's large breasts. It seems to feed off their attention! It steps into the house and sits down in the living room.
The boy and the girl go into the kitchen, while the boy's father and the mousetaur begin to talk about sex. The father asks the mousetaur how its breasts have gotten so big. The mousetaur's ears perk up, and it becomes extremely horny and sweaty. It begins to squirt musk out from its nethers. It has not grown up completely yet, so it's musk is extremely potent and powerful. It has also been able to lay hundreds of eggs at a time, so it is always extremely aroused. The musk spreads into the house, and the two humans become horny and dazed. The father begins to rub the mousetaur's breasts and the mousetaur orgasms, flooding the living room with a sweet smelling musk that permeates the air.
The boy and girl in the kitchen smell the mousetaur's pheromones and feel themselves beginning to transform. Their bodies are beginning to fatten and grow breasts. They can't resist the mousetaur's pheromones. The boy and the girl's father are not affected as much, but he is already beginning to transform. He is rubbing the mousetaur's breasts with a horny look in his eyes.
The mousetaur has become extremely aroused by the attention it's getting from the three humans. It is excited and sweating. Its huge bust is throbbing and its nipples are growing erect. Erect like cocks, with their own plump ballsacs covered in soft fur. The mousetaur feels its penis throbbing and leaking precum. Its erect nipples are beginning to squirt cum, and the three humans are being drenched in its hot cum.
The mousetaur is sweating even more, and it orgasms. Cum gushes out of its nipples as its penis begins to expand and lengthen. It grows a new part of its anatomy - a second enormous shaft that's leaking sperm. Its penis is as large as the rest of its body, and it's throbbing with need. The mousetaur feels a deep urge to impregnate.
The boy and girl come back into the living room, and they have become huge busty cubs, dripping in sexual fluids. Their father is just about to fuck the mousetaur, when they see what's happening.
The mousetaur is hugely pregnant and its belly has grown extremely large. It is orgasmic and can barely move, but it has grown to immense sizes due to its young inside. It can no longer walk, but its huge bust and hips are ready to birth its offspring.
The father and his two cubs get excited by the sight of the mousetaur's pregnant form. He and his cubs press their breasts against the mousetaur's, and they are covered in milk. The mousetaur orgasms and squirts all over the three. It's young begin to push out from inside it, and the mousetaur orgasmic state is making its children grow rapidly and merge with the humans.
***
The daughter, Tabitha, has a long and intimate merging experience with a new mousetaur herm daughter. The daughter, Lottie, is very shy but has been growing and becoming more and more sexual. She and Tabitha have become closer, and they are becoming more and more intimate. They are now getting closer than ever.
Lottie is in heat, and Tabitha's breasts have grown huge, and her body is maturing rapidly. Lottie has begun to be very aroused, and she is growing a penis. It's smaller than her sisters, but it is sensitive and growing as fast as she is.
The two girls are playing in Tabitha's room, and Tabitha has begun to masturbate. She is feeling her own breasts, and playing with her nipples. She is very aroused. She sees Lottie looking at her, and Lottie begins to masturbate also. She's rubbing her growing penis and balls, and they are growing quickly. They are extremely large compared to other young cubs, and they are beginning to fatten.
Tabitha sees Lottie rubbing herself, and she becomes horny, and she feels herself get wet. She becomes so wet that it drips down to her legs and it is beginning to smell. Her pheromones are beginning to permeate the air. She feels herself grow a penis, and she can barely take it anymore. She pushes Lottie onto the bed, and climbs on top of her. Tabitha begins to grind on Lottie's balls and Lottie begins to moan. Lottie's balls are huge and swollen and they are ready to ejaculate. Lottie can barely take it and she begins to cum, flooding Tabitha in her male seed.
Tabitha orgasmic state is making Lottie grow larger and larger. Lottie has begun to change her body, and she is becoming more and more like a mousetaur. Her body is becoming large and voluptuous, and her penis is becoming huge.
Tabitha is not as sexually experienced as Lottie, but she is horny and wants to be with Lottie. Their shoulders press together and fuse, and their bodies push together as they start to merge. Tabitha's breasts grow larger and larger as they merge with Lottie's and Lottie's cock pushes up and deep inside her. The two are merged and can feel their new growth together.
Tabitha is amazed by Lottie's huge breasts and penis. She presses against Lottie's huge breasts and feels their growth. She feels herself grow even more, and her breasts are beginning to merge with Lottie's. Soon they have four big breasts that are growing larger. Their penis is filling Tabitha up, and she is becoming pregnant with Lottie's offspring. Tabitha orgasmic state is making their bodies become more and more hybrided. The two begin to cum together and squirt onto the bed, making the room smell of sex. Tabitha is orgasmic and can't stop cumming. Her body is beginning to change and become fatter. 
Tabitha and Lottie become a two-headed mousetaur. They can't take it anymore and begin to orgasm together. They're thrusting and grinding as one and are cumming at the same time. Their bodies are merging together, and they are fusing together to become one.
***
A young skunk boy finds a mousetaur in his bedroom. It's the first time he has seen a mousetaur. It's a large mousetaur that's extremely horny. Its boobs are huge, and its cock is huge. It begins to strip off its clothes and get on top of the boy. It begins to squirt out musk and pheromones, and the boy can smell the musk and becomes very excited and horny. He smells it more and more, and begins to change and grow. His first change is to grow a second head, a mouse like the mousetaur but covered in skunk fur like him.
The two skunk heads are extremely horny and start to kiss each other. They're both feeling very aroused and horny. They kiss each other as they begin to transform. They have a huge and huge mousetaur on top of them, with a huge pair of breasts, two large penises and a huge tail. The mousetaur is extremely horny, and begins to masturbate on the two boys, making them smell her pheromones. They're both getting very excited. They're rubbing against the mousetaur and begin to grow rapidly. Their penises are growing and they begin to feel the need to impregnate the mousetaur.
The mousetaur begins to get on all fours and starts to thrust its two cocks into the two boys, fucking them and filling them with semen. They orgasm over and over, their bodies growing and merging with the mousetaur's.
The mousetaur fuses with the two boys completely and is now one large mousetaur with three heads covered in skunk fur. The three skunk heads are cumming over and over, and the mousetaur is fucking the two boys hard. They orgasm as one, and they can feel the mousetaur's lust. They orgasm over and over, as the mousetaur gets wetter and wetter.
The merged mousetaur and her skunk heads go downstairs to find the skunk's big sister. They go to her room and find her masturbating. Her skunk head fucks her while the mousetaur fucks her ass. She smells the mousetaur's pheromones and gets very aroused, and her body is changing rapidly. The two head mousetaur's breasts begin to grow large and swollen, and the mousetaur has a huge orgasm. Their semen covers the skunk girl's back and breasts as she begins to give birth.
***
A young rabbit girl and her older sister are in their bedroom. Their parents aren't home, and the older girl has grown breasts, and has a huge cock. The younger girl is playing with her sister's breasts, and her sister begins to change. The younger girl is not feeling anything yet, but her sister begins to feel her growing breasts, and she begins to feel her penis growing erect. She looks down at the young girl and sees her boobs growing.
The older girl's penis is getting harder and harder, and she is feeling her bunny body changing rapidly. Her tail is growing and becoming large. She is feeling the need to breed. She pushes the young girl down and mounts her, sliding her cock deep into the young rabbit. She is fucking her hard and the young girl is feeling herself become fatter, her gut pushing up into a big plump dome. Her pussy is getting wetter and wetter as the older rabbit fucks her. The younger rabbit begins to orgasm as her older sister cums inside her. Her sister's semen fills her belly and her gut begins to swell.
After the two bunnies have fucked, they take a shower together and go downstairs for breakfast. Their parents are sitting at the table, and their dad looks at the young rabbits' huge bulges. He doesn't remember his daughters being hermaphrodites, or sporting such big plump bellies. He is surprised to see that his daughter's bellies are so swollen.
Their mom notices too, but doesn't say anything about it. She begins to prepare breakfast for the three rabbits, while her husband begins to ask the girls about their large growths. They both look at their mom for help, but their mom isn't listening. She is extremely horny, and she has begun to feel herself grow a penis. She is getting wetter and wetter and is feeling the urge to mate with the rabbits. The rabbits smell her arousal, and they feel their bellies growing more and more.
The two rabbits' parents watch in amazement as their daughters grow and merge into one huge bunny with two heads. The huge rabbit has a big pair of breasts, and has a massive cock and two enormous testicles. The bunny is hugely pregnant and its belly is round and swollen. Its huge cock is throbbing and dripping precum, as it is ready to birth its young.
The first bunny daughter to be born has two heads and is already six years old, with large breasts, a large sheath and cock, and heavy balls. The second bunny daughter is three years old and is growing larger, with breasts and a cock that are bigger than her mother's. She is becoming a hermaphrodite, and her parents are dazed.
The bunny's mother is feeling the same things that the bunny mothers did. She is being affected by the pheromones that the bunnies are giving off and she is feeling her breasts and balls growing. She has become pregnant with her daughter's offspring.
"Grow a second head, Mom." the oldest bunny girl says.
The bunny's mother is already growing a second head and two more enormous breasts. Her penis is growing larger and erect as she gives birth right there. She has given birth to two large bunny girls, and they have begun to change, growing a second head and a huge cock. Their breasts are swollen and fatter than the other bunnies, and they begin to fuck each other in front of the rabbits' parents. They are feeling themselves begin to merge together into one.
The rabbits' mother has become an enormous bunny and has given birth to eight bunny cubs, one of which is a female bunny with two heads and eight breasts. This bunny girl runs out of the house and into the neighbor's back yard. The bunny girls' mother and father follow them and find the neighbor's cat laying on top of her, and her boobs have become huge, and her penis is erect and growing. The cat has grown a penis and is fucking the bunny girl.
The bunny girl begins to cum, squirting on the cat as she becomes pregnant with the cat's young. She lays there, exhausted and pregnant. The cat has begun to change and grow breasts, and the neighbor's daughter sees her, and the cat and the rabbit girl are making out. Their bodies are merging as they become one huge cat.
The two cat girls are both extremely horny and begin to fuck each other, cumming over and over, their bodies merging and growing together. Their tails fuse together and they have become a big hybrid cat with huge breasts, two enormous cocks and huge balls. The two are hugely pregnant and the cat girl has given birth to five young cubs. She lays there, orgasmic and dazed, while her hybrids give birth. The bunny girl and her parents return from the neighbor's house. She has given birth to eight new bunny cubs, one of which is a female with two heads, four breasts, and two cocks. This bunny girl has also given birth to two new hybrids, one with two heads, eight breasts, and two cocks. The cat girls return from their mating session and begin to play with the hybrids and fuck them together. Their hybrids' balls are swollen, and they are feeling the need to breed.
The hybrids give birth together, and they have given birth to a few dozen hybrid cubs, one of which is a two headed bunny.