Jeff typed in the information and then clicked the enter button. "Feel anything?"
"Uh..." Mike stammered out. But small happy laughs were between each one as he looked down at his fingernails. The peach color was rapidly turning black. His always trimmed nails were growing out from his finger tips, sharpening into points and bulging into thick claws. A smile flicked on his face as he watched black and white fur coat the back of his hands. He flipped them back and forth, noticing a strange callous on his palm and then one at the tip of each of his fingers start to grow. He eyed them suspiciously. As a construction guy, he wasn't known for having soft hands, but these callouses seemed to bulge and round out into something else. The fur refused to grow onto them. "Paw--Paw pads!" he exclaimed.
Jeff nodded as he watched the fur continue up his father's arms. Each place they touched seemed to nearly double in size, bulging with far more power and strength than the already strong man had. Every part of Mike seemed to be growing at that instant. The shirt he was wearing started to strain against his shoulders. The fabric was having trouble holding together as two boulders for shoulders filled out on the sides of his body. One of his claws naturally pulled at his collar, accidently tearing it. Though, Mike seemed to let out a sigh of relief as his trapezius muscles started to grow. Without the tension holding onto his shoulders, he felt a lot better.
The fur continued up Mike's neck and around his face. A light bit of scruff instantly turned into a full-on beard. The color instantly drained as more and more fur covered his face but black stripes quickly started to fill in again. Mike opened his mouth a bit then played with the muscles of his face. They obviously started to feel weird as his mouth started to push further out from his face. Massive sharp teeth began to fill the empty space. His nose turned upwards as the bone turned into more of a snout than a human nose. Mike barely even notice his ears rounding out and then rising up on the sides of his face onto the top of his head.
"Oh fuck," Mike cursed. His already deep voice only seemed to get lower. But a pain in his spine suddenly made him lurch forward as a tail extended from right above his perfectly sculpted rear. A long ropey appendage continued to lower down his backside almost to the floor. White and black fur started to fill in as it methodically swished back and forth behind him. His nails dug into Jeff's desk as it grew.
But his support on the desk only grew as he felt something different about his feet. His heels suddenly rose up and refused to go back down. With the widening of his feet it was getting harder and harder to place his weight on anything other than his toes. They grew bigger and bulkier, filling his socks. It wasn't until the sharp tiger claws burst through the fabric that he was able to see what was happening to his foot. It shaped itself into a massive paw, still growing to properly accommodate his new weight.
"All done?" Jeff's jaw hung open as he looked up at his now tiger dad. The white and black stripped fur covered insanely large muscles. He couldn't believe he was actually looking at the same person.
Mike gently let go of the desk and allowed more of his weight to be pressed down on his paw pads. He looked down at his muscular body, feeling blood flowing faster and faster. A brush against his powerful bicep and his sensitive nipple sent a shock through his system. What little remained of his baggy shorts lost all its room as his cock started enlarging. "Oh shit..." he muttered. Then quickly spun around to hide his shame.
"Everything alright?" Jeff asked.
"Y-yeah," Mike stammered. "Everything's fine. Daddy just needs a bit of alone time." He was using his massive paw to hide the bulge, though it was fairly obvious what he was doing. It also didn't help just how engorged his cock had become either. He quickly exited back to his bedroom.