The Doctor gave them both a shot right above their hip bone. One on each side, then left the room.
Rob figeted nervously as he waited to see what would happen. A few minutes passed and he sighed with relief. It must have been a dud, or a placebo, or something like that that. He started to stand up from the table he sat on when a sudden pain shot through his lower back. Rob fell to the floor with a yelp, his back arching involuntarily as quick sharp aches ran through his hips, then down his legs. He felt the familiar pressure of his cock getting hard despite his discomfort.
"What... the fuck... is happening?" He panted out as he knelt on his hands and knees, looking down at his proud cock and heavy balls hanging between his thighs. He realized with a shock that his thighs were growing!
The growth came in waves. Each one making them jiggle more and more as what was unmistakably fat seemed to be pumping into them from nowhere.
The sensation of his skin stretching and swelling over sudden growth came from his whole lower body, and he couldnt help but look back over his shoulder at his ass.
It was already large, rippling with every pulse of growth. Large and bubbly, wobbling like jello and still growing.
"What the- FUCK!" He cried out again as the loud crack of bone filled the room, his hips popping as they grew along with everything else. The pain knocked him flat. Rolling over he sat up and looked down to see what was hurting so bad.
"Shit..." Rob moaned, looking at a bottome half that would look more at home on a trans porn star than a man. His sturdy waist, strong and masculine with the hint of fat that came from a comfortable diet, looked almost waspish where it joined his new womanly hips. They were, he realized with a gulp, almost wider than his shoulders, which most considered a defining feature.
His ass bubbled out beneath him, making him feel like he was sitting on a big, soft pillow. The mans' thick, quivering thighs framed his cock and balls, making his manhood look somewhat smaller and somehow prettier than he knew it was. The feeling of his balls being cradled by the soft, hairless flesh was an odd one. And if definitely didnt help the erection he was still sporting.
The feeling of throbbing growth had halted on his hips and legs. But before he could be releived he watched his dick start to throb.
"Oh fuck..." he gasped, dreading what was coming next.