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 is a psychosexual sociopath. She enjoys the pleasure of others, and thrives on their bliss. She takes perverse pleasure in forcing people to take sexual gratification and use their bodies for their own pleasure. She uses her hyper endowments to their full extent, and has a fascination for size differences, and transformation. Safu has no boundaries when it comes to pleasure. She will not stop until she has been satisfied, even if that means overriding their personality, their reality, and everything about them and their loved ones. She loves to force people to love taboo kinks, and enjoys making others too horny to stop themselves.
Safu has no known gender or orientation, as she has sex with anyone and anything. Her personality is completely sex crazed, and her only motivation in life is to bring pleasure to herself and others. She is very open minded about sex, and her fetishes and desires know no bounds. Safu's most common form is that of a Mousetaur, though she sometimes changes her body to be more pleasing to herself and others. Even people who know they shouldn't be attracted to such a young girl, find they lust for Safu beyond sanity. Safu's pheromones make her impossible to resist, and her body is extremely attractive to everyone, no matter who or what they are.
Kerry is fed a droplet of Safu's cum in her school lunch. As the day progresses, Kerry becomes increasingly turned on. She's unable to focus on anything but sex. Her mind is consumed with thoughts of breeding, growing, and fucking her schoolmates. Her body grows hot, and she finds herself unable to think straight. The more she tries to ignore the thoughts, the worse they become. Eventually, she begins to feel the changes to her body. Her chest grows larger, her butt more shapely, and her hips widen. Fat virile balls fill the space between her thighs, and a large sheath filled with her new cock grows so big it bulges her skirt and panties.
Kerry is desperate, and runs into the bathroom. She's so turned on she can't think straight. She goes to the sink, and looks at herself in the mirror. Her eyes are glazed over, and her face is flushed. Her nipples poke out through her top, and her breasts jut out from her body. Her cock bulges from her skirt, and it twitches and throbs. She can't think straight, and is panting and moaning with need. She lifts her skirt up and grabs her cock. She squeezes her cock and begins to stroke it. She moans and whimpers, and her eyes roll back into her head. She can't resist the feeling, and soon she is pumping her cock faster and faster.
She feels a pressure in her balls and a tightening in her stomach, and suddenly her cock pulses and begins shooting out huge thick globs of cum. She moans loudly as she shoots again and again. She does not stop cumming, and instead starts farting massively. Kerry's farts are pure pheromones! The smell is incredibly strong and fills the room in seconds. The fumes make her even hornier than before, and she cums even more. She is unable to control herself, and her farts and cumming are so strong they blow her skirt up, and cover her with her own cum.
As her farts and cumming begin to slow, Kerry falls to her knees and starts eating the cum and licking the floor clean. She slurps and moans, and her cock is still rock hard. She's addicted to the taste, and needs more. She feels an emptiness inside her, and knows the only thing that can satisfy her is a good, long, hard fuck.
As she's on her hands and knees, her cock and balls hang down below her. Her pussy behind her balls gushes with estrus, and her butthole has plumped into a large puffy donut constantly erupting with more gas. She's completely consumed with her hunger for more, and leaves the bathroom and wanders the halls in a lusty stupor.
Toby the fox boy bumps into Kerry and gets a deep whiff of her musky gas. He can't control himself and his pants rip apart, unleashing his throbbing fox cock. He pins Kerry down and rams his cock into her pussy. She is so turned on she instantly cums, her pussy convulsing and squeezing his cock. His knot swells up and he's locked inside her. They both moan and whimper, their eyes rolling back into their heads as their orgasms keep going.
Kerry is filled with Toby's virile seed, and she instantly gets pregnant. She screams and moans and cums and farts, her body changing to accommodate the new life growing inside her. She's impregnated by fox cum and her belly swells with her new cub. She cums and farts uncontrollably, her body becoming even more sexual. She can't control herself, and keeps cumming. She's completely given into her lust, and becomes an incubator for her own children. She can't stop cumming, and she cums all over again when Toby finally pulls out, his cock bigger than when he started fucking her. 
Toby manages to stuff his huge fox cock into his pants and head home, dazed and dizzy and smelling like Kerry. His hips and butt swell larger and make him bottom-heavy. He gets home, reeking with musk and cum, while his teenaged sister is watching TV on the couch. His sister is instantly turned on and drops her pants and spreads her legs. She moans and begs for his cock, and Toby's eyes are drawn to her pussy. He can't control himself, and he pins her down and fucks her hard and fast.
His sister instantly orgasms, her pussy clamping down on his huge throbbing knotted fox cock. He pounds her and fucks her until his knot is fully inserted and then begins cumming hard. His sister's belly swells up with his cubs and her own cum. She cums and farts uncontrollably. The sound of her farting drives him wild, and he fucks her again and again, making her cum and fart.
As his sister grows pregnant, her chest swells and grows into large milk-filled breasts. He continues to fuck her, his balls swelling with his load, and her belly swelling with his cubs. Soon, his sister's belly is huge, and her tits are so big they are leaking milk. She cums over and over, and her farts grow stronger and more powerful. He continues to fuck her, his balls and butt growing with each load he unloads inside her. Soon, his balls are massive, and his butt is so round and wide he can't sit on the couch without falling over.
He's lost in a haze of lust, and can't stop fucking his pregnant sister. His cock is constantly throbbing and leaking precum, and he's so turned on he can't stop. He keeps pounding her until her pussy can't take it anymore, and he has to pull out. His sister's pussy is red and swollen, and his sister can't move. She's been cumming and farting for hours, and she's exhausted.
He looks at his sister's big swollen belly and her massive tits, and he can't control himself. He pins her down and rams his huge throbbing cock into her ass. She screams and cums and her tits start squirting milk. He pounds her ass until his knot is buried deep in her. He cums hard, filling her ass with his virile seed. His sister's belly swells, and she cums and farts uncontrollably. Her stomach distends, and her butt and hips and chest swell up even more.
He's so turned on by her reaction, he keeps fucking her until his sister's belly is so huge, her tits are dripping with milk, and her ass is so round and puffy her legs won't fit around him anymore. He finally cums one last time, and pulls out, leaving his sister a bloated, leaking, gas-spewing mess. His sister's belly is so big and distended that she can't even see her feet.
Upstairs, Toby's little sister smells the gas and feels a pleasurable ache in her cute butt. She goes down the stairs and sees her sister in a puddle of milk and cum. She sees her big swollen belly, and her huge swollen butt, and her massive tits, and her big puffy donut gaping and spewing gas. She's overcome with lust, and crawls towards her sister. She sticks her nose in her gaping hole and breathes in deep, taking in the scent. She shoves her tongue deep into her sister's asshole and slurps up her sister's gas.
Her whole body shakes as her sister's pheromones hit her, and she cums uncontrollably. Her clothes shred themselves off her body, and her nipples pierce her shirt. Her butt plumps and swells, and her tailhole winks. She licks and sucks her sister's gas, her butt gushing with arousal. She feels her cock and balls plumping up, and her nipples hardening.
She moans and whimpers, and feels a heat deep in her belly. She feels her stomach expanding and distending, and her whole body growing. Her chest and butt expand, and her cock and balls grow and bulge. Her nipples become sensitive and puffy, and her tailhole flares. Her body grows, and she feels her skin tingling and stretching. She cums, her pussy squirting and her tailhole pulsing. Her cock and balls throb and her nipples leak milk.
She keeps eating her sister's gas, her body changing. Her stomach grows bigger and bigger, and her chest and butt swell even more. She keeps eating, her whole body expanding. Her cock grows so big and long it's sticking out from under her huge gut, and her balls are massive and swollen. Her butt is huge and round, and her tailhole is winking. She keeps eating her sister's gas, her stomach growing impossibly large. Her tits are so big she can't move them, and her cock and balls are even bigger.