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Miscalculation

"Boss, we're ready for Trial 18 on that new serum. Boss?" The intern tugged at Seda's sleeve, trying to get the lab director's attention as he stared off into space, preoccupied with something.

Seda snapped back to reality and focused his attention on his assistant. "What? Oh, yes. Lead the way, Darryl. I want to oversee this one personally."

Darryl nodded and strode through the halls toward the test chamber, their tail wagging slightly. They'd been assured they'd be back to human form in no time, but that had been nearly a month ago and they still had the damn tail. Oh well. At least it was expressive.

Upon arrival, there turned out to be a problem. Darryl sighed. There was always a problem. "It seems our test subject has...gone missing, Boss. We'll have to postpone the test until --"

"Nonsense!" Seda interjected. "I'll be the test subject. After 17 trials, we must have worked most of the kinks out!"

Darryl simply sighed resignedly. "As you wish, Boss. Just take a seat in there and I'll fire up the injector."

Seda stepped into the test chamber airlock, and then the chamber itself. It was cold in the room, which was mostly empty save for a single chair covered in straps and buckles. The air smelled faintly of metal and antiseptic. He took a seat in the chair, sinking back against the cushioning and shivering slightly from the chill. As Darryl operated the controls for the test chamber, several straps and belts automatically slipped into place. Wouldn't do to have test subjects falling out of the chair mid-experiment. "Go ahead!" Seda called out, his words muffled by the thick insulation of the chamber walls, as he gave a thumbs-up.

Darryl pulled the activation lever.

An injector needle poked out from the chair and jabbed into Seda's exposed arm, injecting the required dosage of the experimental serum. Now all that was left was to wait. At first, all Seda felt was soreness from the injection site. Then his vision blurred. Sounds were oddly muffled, but he could feel the straps straining and flexing as various pops, cracks, and grinding noises sounded from throughout his body. He grunted in pain as his spine reconfigured itself at high speed, his feet stretched, his ears grew larger, his face longer, and a dozen other changes all took place at once with almost frightening speed. We really need to add a sedative to the process. Most people aren't going to take this well otherwise.

Among other sounds was the faint tearing of fabric as his changing body shredded his lab jacket. The third one this week! We really need to invest in more flexible, durable materials. Gray and brown fur sprouted from his body as he continued writhing and distorting in the chair, the straps barely holding him in place. His teeth grew noticeably sharper, particularly in the front. His long tail grew in, twitching and coiling. Wait, coiling? His trousers and undergarments tore several seams and dropped away, but Seda wasn't concerned with modesty at the moment. He glanced down and reconsidered this sentiment. Why were his balls so utterly massive? And for that matter, why was his sheath much smaller than usual? Maybe they hadn't worked out all the kinks after all...

A few moments later, and the twitches and spasms finally calmed down, his body settling into its new form. The straps didn't release just yet, though. Darryl's voice sounded over an intercom speaker in the ceiling. "Uh, Boss? We were trying to go for 'werewolf' here, right? I'm pretty sure that's, uh, not what you got."

Seda glanced down at his paws. Bare-skinned and almost resembling human hands. As the straps finally released, he slipped out of the chair and stood on the floor unsteadily, using his tail to balance himself. His long, nearly prehensile, decidedly not fluffy tail. "Oh. It seems we've created a were-rat serum instead. That's...not what I'd hoped for, but it could be worse!"

Darryl simply shook their head. "I'll, uh, send for a new lab outfit. We've probably got something that will fit."

"Sure thing. I'll be in the decontamination shower. Standard safety protocol, and all." Seda wrapped himself in the remains of his lab clothes and exited the test chamber through a door on the opposite side from the entrance. Why do we even have two entrances to a sterile test chamber?

Sighing with relief at this newfound if rather cramped privacy, he reached down to massage his sizable scrotum. His resulting erection was not especially impressive compared to what he was used to from some of his other forms, but it was very hard and already twitching in time to his accelerated heartbeat. He began stroking it just as the hot water from the decontamination shower washed over his body. The sensations from his whiskers and tail were overwhelming; electric jolts raced through his body from both directions and seemed to white out his brain with static. His muscles tensed, his cock throbbed, he found himself leaning forward on tiptoes. For a moment his vision went blurry again, and his mouth opened but all that came out were a series of high-pitched squeaks as he blew a surprisingly large load all over the shower wall. When his legs stopped wobbling and his back stopped arching and he could see one shower head instead of two, he glanced down to see that he was still as stiff as before. Clearly I'm going to require more than one decontamination cycle for this experiment.

Darryl said nothing about the 40-minute-long decontamination shower, not even to remark on the adverse financial effects of using so much water and disinfectant for a single trial. They simply handed Seda a new lab jacket as he exited the shower, gaze pointedly averted but otherwise without comment beyond, "I'll make sure these results get put to good use. You'll want to keep monitoring for signs of any adverse effects, but our data indicate things should go back to normal inside of a month or so. The tail probably won't be permanent." They gave a small, wicked grin. "At least, that's what I'm told."