While Jeff was activating the transformation, his father was intently watching the football match. At that exact moment, his team scored the winning play and he jumped into the air, whooping. After a moment, he settled back down and sighed.
"Damn, wish my old man was here to watch it with me."
In the other room, Jeff felt a strange heat flush through his body. His arms and legs seemed to be creaking, the muscles tensing like he was stretching himself, but instead of relaxing again, they seemed to just extend further. Looking down, he could see his legs below the hems of his pants, which were rapidly becoming too small for him.
Not only that, but the flesh on his legs was much hairier than before, and his skin was tingling all over. His stomach began to growl, and he felt a weight settling on his chest. Looking down at his shirt, which was riding up at the waist as he grew taller, he saw it begin to bulge forward, a chubbiness and additional pounds of weight growing on Jeff's body.
With some difficulty, Jeff pulled off his shirt and looked down at his chest. Where previously he has been almost hairless, he was now sporting a thick and fuzzy treasure trail, which was growing thicker as he watched. Grey and black hairs poked through on his belly and chest, spreading into a thick salt and pepper carpet.
The chair beneath Jeff creaked as he felt himself growing more solid, a sensation of strength and masculinity pumping through his veins. He watched as his scrawny arms began to swell, biceps thickening and forearms growing meaty with muscle under a shaggy coating of gray hair. His belly pushed forward, growing into a more round ball as muscles formed beneath the layer of blubber, giving him a large hairy musclegut.
His pants and socks were beginning to hurt and constrict him, so Jeff quickly pulled down his pants and tugged his socks off, throwing them aside to look down as his thighs grew wider, and his feet began to crack and stretch, spreading and becoming longer and wider. A noticeable dusting of white hair spread across the top of his foot and toes, and he raised his hands to his face in awe as they grew, the backs becoming hairier too while his palms darkened slightly, turning rough and calloused.
Jeff grunted, his wider, deeper chest making the sound deep and gruff, as the bulge in the front of his strained underwear stretched significantly, growing heavy and potent as he felt a sense of warmth and power in his groin that he had never before experienced. As he felt a tingling run across his cheeks, he quickly sprinted to a mirror to watch his changes progress further.
Staring in amazement, Jeff saw his face begin to weather and age, his juvenile features hardening as his chin grew wider, brows more furrowed and expression mature and adult. His teenage looks shifted to those of a handsome and masculine patriarch, and he saw his hairline begin to recede, the thinning hair turning grey as it moved back on his forehead.
The thinning of hair on top was more than made up for by what followed the tingling on Jeff's cheeks, however, as he saw white stubble begin to dust his cheeks and chin, rapidly becoming thicker and longer as bushy whiskers pushed out from under his nose, forming a silky grey mustache. His sideburns stretched down, merging into the growing hair on the lower part of his face as his skin was rapidly concealed by a huge, thick beard.
As the Chronivac whirred and finished up, Jeff shivered as a few final changes took place. Color blossomed on his left bicep, forming a rose tattoo, and a slight tingle crossed the side of his belly as he looked down to see an old scar appear. In the mirror, where once had been a teenager, was now a handsome and mature sixty year old bear.