Jeff was by now really feeling strong and empowered by that incredible transformation - nothing had ever given him that kind of rush before. Nothing had ever made him feel so strong and...and wow, aggressive. He looked at the Chronivac and licked slightly thicker lips, crossing his arms in front of his muscled chest. His body was so amazing at just 10%, why not go further and see what happened at 20%? He doubted he was just gonna manifest any overwhelming bull traits, and even if he did he had more than apt clothes for hiding it.
Jeff was barely cognizant of it when he was typing in the new changes in the Chronivac, overriding the old ones, establishing a longer duration and further empowering himself. 20% should be plenty awesome, he decided to himself. He set the transformation to begin and he stood back so as not to damage the machines...
The young man was immediately hit by a hot, powerful sensation as his already muscled, thick form began to bulge out even more, the hair covering his torso and chest beginning to thicken again. He threw back his head and moaned loud, hearing a deeper tone to that moan than what he usually had. His shoulders broadened and widened to powerful spheres of muscular strength, able to decimate any shirt that he might put on him. Tank tops for Jeff from now on.
He was not even the slightest bit mad when he felt his chest and midsection thickening, the midsection pushing out into more of a thick and burly pillar of muscular strength instead of possessing clear, fitness model abdominals. His chest likewise pushed out more, and Jeff grunted when he felt his body in general widen further. He shouted outloud, "MMMMOTHERFUCKER, this is amazing! I feel so fucking strong!!" Screw measure and trying to keep control.
Jeff was gonna be the big bully boy he was becoming now. He was gonna... "FFFFUCK!!!" Jeff felt something start to push out from his forehead even as his legs thickened to massive strong pillars of flesh. His hands brushed over, feeling two very slight sharp points on his forehead. "...the fuck is that?" He murmured to himself.
He started moving his legs and shifting posture a bit, his toenails starting to feel kind of odd. But he figured it was nothing. What was distinctly not nothing was a strong pulling sensation in his manhood. Jeff dumbly chuckled outloud, "I'm gonna have such a big fuckin' dick..." He began rubbing it and distinctly enjoyed how it felt through his shorts, which now resembled more short shorts. The impression of his manhood now looked larger, distinct from how other guys' dicks usually looked...
...Jeff wasn't bothered by it though. Just meant the people he fucked would remember how it was.
His muscles finished coming in, and Jeff again flexed his biceps, standing up and showing off for his bedside mirror. He was gonna have so much fucking fun with this new bod. Sure the seat of his pants felt kinda tight from something at his tailbone pushing out more, but he didn't mind. "The girls are gonna wanna fuck me...and the guys...the guys are gonna wanna fuck me, too."
Jeff tried to think of what to do; so many interesting ways to enjoy himself now. He could go exercise...try to find someone to fuck...or maybe even further change himself up...