The feeling of the warmth inside his lover was amazing, and the fur up against his legs made the feeling of afterglow the best of Scott's life. Sliding his member out of the lion's backside, he walked around to the front. Trevor was laying there with a satisfied purr. Scott presented his sub with his wet member. "Here Trevor, help me with this." Obediently the lion begins to lick his Dom's prick clean. Scott looks over at the Doc Greggor just in time to see him hit orgasm, spraying his seed several feet. Apparently he liked the show.
Trevor finished up quickly. Scott pulled his pants back up and buttoned up about the same time the doctor did. "So," he said, "I think I'm sold." He stood up without another look to Trevor and headed over to the table with the contracts. "I'll see you after the transformation Trevor." The lion nodded to the black man and headed back out into the enclosure.
"Excellent," Dr. Greggor said.
"I wonder if I can make a custom order – I mean, about what I look like."
"I'm glad you asked," the doctor said as Trevor signed the seven year contract. "We've made many improvements in our transformations over the years. Our first generation transformation made the human mind the subconscious and the animal the conscious. The 2nd generation solved that. Third generation brought a quicker transformation. That's the one I went through – for about four months. I was a test subject. Last year we started the 4th generation transformation, which increased the harmony between human personality and animal instinct. That's what Trevor received. This new transformation, the mark 5, allows you to choose your own coloration, size, and animal personality – within the confines of the species, of course.
"We made your serum based on what we got off of your online survey responses. If you don't like it, we can produce a new serum for you, but it'll take a day." The doctor opened a metal door into another lab room. "This is where we do the transformations. Come on in, Scott."
"Thanks," he responded. "I'd like to be big. I mean, not monstrously big, but about as big as lions get. And I'd like to keep my dark eyes and hair – er mane I mean."
"That's what we expected. To increase your size, we'll increase the serum dose slightly. Lay down, Scott."
Scott looked around. The lab looked like a hospital room, except the table in the middle. It was metal and had straps to pin down the subject. He looked warily at the doctor.
"The first and last stages are painful, Scott. I won't lie about that. These two stages rearrange the body. We strap you down during these two parts. In between you can be up and walking about, as long as the mobile monitors are hooked up. Please, lay down on your stomach. You wouldn't want your tail to get cramped when it grows out."
Scott shrugged, but obeyed. Two assistants came over and strapped him down tightly. One drew blood from his right arm. "To store your DNA for your return to humanity," he explained. The other inserted a catheter into his left arm. Into it was placed a saline drip that had been nutrient enriched. He would need that to increase body mass and to avoid dehydration, he was told. Then Dr. Greggor came over. "Here we are, Mark 5 lion serum, formulated for Mr. Scott Mtumbu. Ready?" Scott nodded. The doctor injected him.
The assistants left the room and the doctor went to his desk to sit down. "I'll stay in the room to make sure your vitals remain good. You should start to transform – well, now.
Instantly, pain shot up through Scott's arm. It burned like acid as his cells abandoned their DNA and adopted a new set. It felt as though his bones were being crushed as they reshaped according to their new instructions. He couldn't tell where the pain was coming from. When his hands and feet shaped into paws there was too much pain to locate it. When his face shot out into a muzzle there were too many tears in his eyes to notice. The only pain he specifically identified was his spine growing out into a tail. He wanted to crawl away, but all he could do was shake and spasm.
The pain didn't end abruptly. It started to dull and weaken after an hour. After a few more it began to fade enough for him to regain his senses. Then he saw the doctor above him, changing his saline bag. The first one was empty. "Don't worry," he said. "You're through the first stage. The second stage is painless. Your body is just getting over the shock. I'm going to unbind you now. You can get up when you feel up to it. I'll still be here, at my desk, doing paperwork.
Instead of getting up, Scott fell asleep. The next day was full of fitful sleep as his body put on pound after pound of new flesh. He was bulking up. After sundown the final stage hit. It felt nearly as bad as the first, but not quite. By the time it was over, Scott was the larger than any lion seen in the wild, and one of the largest found in zoos.
When he was feeling up to walking, they took him to the third and final lab room, where he could recover before he met the pride.