A bright flash of light and inside Jeff he felt a sudden rush and an arousal like nothing he had ever yet known.
He began to feel very strange, as he stroked his rapidly increasing muscular body, he felt the sprouting of what was his black and brown fur.
Jeff stood then nakedly before a full length mirror attached to a closet door.
Insatiably giggling at the weird feelings he felt, and when seeing his hands bunch into what would soon be his forepaws, Jeff began breathing so rapidly, his tongue lolled out the sides of his expanding mouth.
Thrilled at how smooth his muscular doggish form did feel, the silky short fur and his skin tingled as if more sensual than anything he had known to date.
Jeff watched as his human maleness receded up into his groin, and then in a rather painful manner the internal organs began to shift and move, his penis held in a canine sheath did moments later poke out, red, and uncircumcised, he laughed at seeing how he had the cock like a big dog.
The computer whirled as the program ran on to make and force the new and finalized transitions to what began as a bright youthful male, and would soon be as one matured big Doberman sire.
Jeff sighed, the sound of it as changed as was his vocal cords and the way his neck and throat took on the contours of being like a dog. The wild sensations had Jeff so enthralled in his sensations, he failed to take note of the error message showing up on the computer screen.
Falling soon to stand on all fours, Jeff felt so natural in this pose, the feelings of this only added to his drunken euphoria.
The radical transitions from male human to be a mature size of stud dog had Jeff enjoying his real life fantasy. he failed to care when his thighs and rear did give a harsh snap and transfixed him to stand properly as would a normal dog.
The fact of his becoming a big male Doberman dog was to Jeff as much a thrill as when from the sensations of change he became aroused, gaining a massive male dog size of an erection.
Pelvic thrusting only continued his asserting his male organ until at the peak of his lusty motions, Jeff felt his doggy maleness erupt, spilling forth his wealth of both human and canine semen.
Head and mouth, teeth, tongue, eyes and ears, Jeff had then the head of a Doberman, and with this downsizing came the slow realization he was becoming less intelligent and more like a real dog.
The computer program was set for making a person into a champion animal, and in this mode Jeff paid little attention to his growing only a very short stub of a tail.
Jeff in his degraded mental state gave a pondering look back at the noisy whirling computer setting there on the desk.
Eying the computer screen, head cocked with doggish wonder, Jeff tried to read what was printed in big red flashing letters and words on the screen, but his brain being so much the smaller held him in a state of doggish ignorance.
Vaguely, Jeff wondered if he would be a dog for one day or some longer period of time, the thought of this was short-lived, as his dog self urged him to begin to wander, sniffing at the floor, and seeking a n alluring scent that tended to ad stimulation to his already partially aroused maleness.
Sniffing, Jeff acting more like a real dog went from his room and worked along following the scent till he arrived at the door to the bedroom belonging to his elder sister, Tina.
Unknown to Jeff by this time when his mind had degraded to being fully canine, the scent of Tina was rich and musky, a real treat to a big male dog.
Surprised at seeing this large and very well endowed male dog standing on all fours and presenting Tina with an eyeful of aroused doggish cock, Tina knelt down and beckoned the pooch into her bedroom.
Petting Jeff, and a roaming soft hand took hold of his aroused shaft, the big dog yelped from the sensation, rearing up on his hind paws, Jeff tried to mount Tina as if she were his willing bitch.
Tina fell backwards, she landing on her back with legs spread wide and allowing an aroused male dog to begin sniffing; Jeff falling forward and stuffed his black nose into where Tina felt it and began to giggle.