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This is for the endangered species story contest! :] If you aren't legal, then don't read this. Shut your eyes or they will be burned horribly. If you are legal and eyes will not burn, then please go on! Enjoy~

Thomas and Anthony were bent over a table, poring carefully over hundreds of pages of documentation they had used to keep track of their research. What research was this? Well, they worked for the zoo and their particular zoo was having trouble acquiring exotic and rare animals for exhibits. So, if you cant get them normally... Just make them. Right? Right. So here they were perfecting a serum to inject into a monkey. (They had a surplus because the zoo monkeys breed like, well... monkeys.) They were very close to finishing, aside from one dilemma.

No matter what modifications they made the monkey would never turn COMPLETELY into another animal, it always kept some of its monkey-ness. With sighs Thomas and Anthony decided to take a break for lunch and get back to trying to solve the problem when their other scientist assistant, Grace, returned. So Thomas and Anthony left the lab and went out to eat lunch.

However, one of their monkeys had different plans. He had been altered mentally by the repeated use of the serums and his intelligence now rivaled a human's. He was tired of being a test monkey and decided to have some other fun. He quickly escaped his simple cage and looked among the vast array of completed serums and chose a random three. He dumped each one into one of the Scientists' coffee mugs and went back into his cage to watch the fun begin.

The scientists all returned together, having all met up at the same place to eat lunch. They milled around for a minute, getting everything in order before they started working again. Like any real scientist or researcher they consumed vast amounts of caffeine and therefore drank their drugged coffee fairly soon after. The effects were near instantaneous, and the monkey watched amused as the effects he knew so well.

Grace was feeling a bit sweaty, but she knew it was at least 50 degrees in the lab. The serum was designed to also raise the sexual desires of the animals so as to encourage the new animals to procreate and continue their species. She began scratching at her arms, she was feeling so hot and itchy it was near unbearable. "Anthony, Thomas? Does it feel hot in here?"

Anthony and Thomas were feeling the same things, and both felt very very horny. "Actually, yeah. Is the A/C broken again?" Thomas asked, unbuttoning his lab coat. Anthony was doing the same, practically tearing his coat away from his body.

Grace was absentmindedly rubbing her crotch, she was starting to feel an unbearable itching heat in her nether-regions. She hadn't even noticed she had shredded the front off her pants with new claws that were beginning to form on her fingers.

Both trying desperately to hide their growing erections, Thomas and Anthony squeezed their legs together and hunched over a little trying to mask the quite obvious bulges in their pants. They both were massaging the raging hardons through their pants, unable to resist touching themselves.

Just rubbing wasn't enough for Grace, and overcome with immense sexual frustration she jumped onto the lab gurney, ripped off her pants, and shoved the end of a large test tube into her aching pussy. Grace moaned out with delight, ravishing herself with the cold glass tube.

Thomas and Anthony suddenly smelled a new scent they had never before caught a whiff of, the aroma of a bitch in heat. Their cocks surged with delight at the smell, and they quickly unclothed themselves and threw themselves at her.

After getting there first, Anthony jerked the test tube away from Grace's needy vagina, who growled (yes, growled) in protest. That is, protest until Anthony slammed a cock into her cunt that felt better than any stiff test tube.

She yowled and moaned, Anthony's shaft felt way bigger than any human's should. Grace couldn't keep silent at all, so stretched was she by the immensity of Anthony inside of her. She was forced silent, however, when Thomas shoved his own length right down her throat.

Though Thomas felt something he hadn't quite expected. Something sharp? He found the cause rather soon as grace opened her mouth for breath; she had large fangs filling her mouth! Something else odd, her mouth seemed to be growing out? This didn't concern Thomas terribly, it just allowed her to fit more of his cock in her mouth.

Anthony moaned out, pounding away into Grace's tight cunt. Through his bliss he looked down and noticed something strange about his rod. There were bulges around the base where he was MUCH thicker, and he was sure his dick must have grown at least twice its normal size. And not only that, but his skin seemed to be turning slightly gray and it felt thicker than usual. But these thoughts were quickly forgotten when he again lost himself in the bliss Grace was providing for him.

Grace knew something was up, but it all felt too good to stop. Being filled so much by Anthony and having to suck so hard and eagerly at Thomas made her feel so great and horny. She did notice, however, that her tongue had grown considerably longer and that her face had pushed out into a short muzzle. The nature of the muzzle was made quite apparent when she saw whiskers sprout from the sides of her new muzzle.

Something was tickling at the bottom of Anthony's shaft, and he looked down briefly and saw an orange and black ringed tail growing from Grace's rump. He grinned and grabbed it, yanking the furry appendage a bit roughly. This drew Grace to yelp in surprise, feelings of a new part of her body foreign to her.

Anthony's new thick and somewhat rough skin felt wondrous as it rubbed between her thighs, and the fur growing between her legs felt good rubbing against Anthony.

Grace fondled her breasts with her free hands, feeling that a later of soft fur had grown over her entire body. It was orange and black striped, making it clear that Grace was turning into a tigress. Grace could tell that her breasts had grown several cup sizes; they felt so much heavier, rounder, and softer. Her hands had since grown tipped with dark black claws and thick pads had formed on her palms. They were really more like paws now, actually.

Thomas had followed a similar path, though his fur coloration appeared to be black and white. His ears were rounded unlike the pointed feline ears that Grace now sported, instead they were round and covered in black fur. He laid himself back some, letting Grace just go to work on lavishing his cock with her warm, wet maw.

The shape of Anthony's shaft was now a monstrous rod, it was a small miracle it could even fit into grace. But it felt so good.... Anthony could feel pressure building inside him, the beginnings of what would be his first orgasm as a rhinoceros. He had an elongated face now, too, only at the end his nose was tipped with a huge vertical horn. His skin was thick leathery gray, and his feet were now decidedly hoofed. His hands had grown into three digit appendages, each digit terminating in a thick black nail.

Grace was fulfilling her new role as a sex kitten (hehe) quite well, the way she needed Anthony to fill her just as much as she wanted him to stretch her aching cunt, and the way she sucked on Thomas' shaft with such fervor.

Anthony felt his orgasm approaching, and he had had enough. It was almost like Grace sensed this, as her pussy seemed to clamp down on him even tighter. This was all too much, and he rammed this the thicker base of his shaft straight into her as his climax unleashed itself immediately.

Grace felt steaming liquid fill her insides like it was coming from a pressure washer, and the thicker girth of his cock now in her made her take her own climax right after. Her walls shook and undulated around Anthony, just adding to his sea of pleasure, and she sucked down onto Thomas one last time before the floodgates holding him in let loose and hot seed poured into her open maw.

The taste of thick, strong panda semen filled her mouth and the smell permeated her nostrils, filling her with even more lust. Anthony had adequately filled her, excess cum now leaking from around the sides of his cock still buried in her cunt.

They all sighed in the wondrous afterglow, the incredible feelings of their new bodies washing over them. Grace refused to wait long, though, and removed herself from Anthony's foot long spear and presented her sopping wet pussy Panda Thomas, who grabbed her and shoved his slightly shorter but MUCH thicker cock in to satisfy her burning pussy once again. Grace then impaled herself through her ass onto Anthony again, the incredible sensation of two enormous cocks filling her at the same time making her scream out her ecstasy.

Well, the increased sexual desire portion of the serum seemed to work. The monkey giggled as he watched from his cage; he knew the show had a long time left to go.