As Ty took in the newly formed bulk that was his roomate, he started getting some new ideas. He knew he always had a thing for size, the bigger the better, and now he could experiment and tailor Josh to his tastes.
"Just a sec, Josh, I just need to finish something."
He couldn't be bothered fiddling with the settings too much so he clicked one of the muscle presets: body builder. He did make sure the new Josh would be considered normal though. No need to not upset him, right?
He spun around again in time to catch the transformation. He saw Josh, still lying on the bed and rubbing his stomach in anticipation of food. Ty watched as Joshes form expanded all over. His arms and legs thickened, going from soft doughy to thick and bulky. The man boobs gained some defintion and became two huge spheres of fat and muscle, each larger then Tys head. As the large form became massive the bed groaned in protest.
Ty quickly did the math. Josh went from 130lb of regular lean guy, then had 100lb of fat thrown on him and now, judging by the readout, has had another 100lb, all of which was muscle! He looked like a power lifter that had really let himself go. This guy was almost three times his own mass, and with his new appetite, was only going to get bigger.
"Hey, Ty, you can stare after I am fed. I'm starting to waste away here," Josh said, slapping his meaty gut. With the added muscle the gut no longer spilled all over the bed but sat high and strong. Using the weight of his thick legs (each of which was twice as large as Tys own), Josh rocked himself upright.
It seemed to take some effort, so Ty stood to help his massive roommate. Josh was no longer just a blob though and gained his feet with surpassing quickness. Ty found himself colliding with the muscle gut and feel back into his chair. Josh seemed to be unaffected.
"Hey sorry Ty. I feel like a bull in a china shop sometimes. Especially in this tiny bedroom."
He turned and walked towards the kitchen, still only dressed in the towel. Ty slowly rubbed his raging boner as the "bull" squeezed himself through the door frame in search of more food.