"Here goes nothing." Jeff says to himself as he presses the Enter key.
Almost immediately, something that feels like an electric charge rushes through him. He gasps and then sighs as the initial electrifying charge dulls down to a warm, pleasurable feeling. His muscles tense and flex because of the warm roll of pleasurable energy cycling all throughout his body. He leans back into his chair and grabs onto it by the arms. His sense of smell and hearing come alive for him, bringing to him every scent and sound neatly and more distinctly than before. He feels an odd pressure behind his face and then with surprise and some shock, he watches as his nose and mouth push outward into a white-furred muzzle.
He looks down at his arms. His breath quickens, his eyes widen and his ears perk up as he watches as small white hairs pushing through two now very muscular arms. He looks a little farther down his now muscular arms at his hands, and sees how paw-like they have become with their running claws and paw pads. An odd feeling then distracts him away from the sight of his arms and hands. He looks down at his pants and feels something growing deep inside of them. He quickly gets up on his feet. He fumbles at his belt for a minute with paw-like hands and pulls it off. Jeff tries to quickly unbutton and unzip his pants, but before he could even get them off him. He hears a loud ripping noise come from the seat of his pants. Jeff looks behind him and then chuckles, for growing out of a hole in his pants is his tail.
"Oh yes!" He growls in a deep, barely recognizable voice.
He wags it with glee as it grows longer and furrier by the minute. His whole anthropomorphic canine body feels warm all over as his growing fur coat tickles him in a pleasurable way.
<Oh man! This feels so good!> Jeff howls, his words now a collection of intelligible barks, woofs and growls.
"Oh, my god! Jeff.... Jeff is a dog!" A familiar voice shouts
Jeff spins around and sees his three best friends standing in the open doorway to his room. Seeing, smelling and hearing their surprise proves too much for Jeff. He lets off some barking laughter, his tail wagging happily behind him rapidly.
<So>..."Ahem, so what do you three think of me now, guys?" Jeff asks them with a cock of his head and a flick of his tail. "Is this me or what? Woof!"