The stepbrothers enjoyed a long fuck session, as Jeff pounded his dick into Johannes' ass, using his considerable strength to make sure that his former tormentor felt every thrust. Johannes definitely appreciated that; now that he was fully gay, being fucked by a muscular stud was quite enjoyable!
After a good fifteen minutes of solid fucking, Jeff let out a grunt as he came into his brother's ass. The two of them grunted and moaned together, both enjoying the experience. But Johannes recovered quicker than his stepbrother. With a clean elbow to the temple, Jeff was knocked out cold. Regretfully, Johannes removed himself from his unconscious stepbrother's dick, and looked at the computer.
There were... so many options! He looked over the statistics for Jeff's body. 5'9" tall still, but a muscular 235 pounds, with a seven inch dick. It was good for a start, but Johannes wanted more. The first order of business was to ensure obedience, entering a custom command that required Jeff to obey him. Then the fun part came.
First, Johannes opened the dominance/submission menu. He left Jeff dominant as to everyone but himself--for that setting, Johannes chose 85% submissive, 15% dominant--just enough to keep a bit of Jeff's spunk, he hoped.
Then, it was on to Jeff's body. The boy's stats were good, now. Great, even. But Johannes wanted more: a sex slave who's stats were nothing short of incredible. Remembering the rough fuck he'd just experienced, Johannes began by taking Jeff's cock up to ten inches and doubling the size of his balls. That alone was enough to make Johannes shiver with excitement. Then he moved on to overall height, and chose 6'6"--Jeff would tower over most people. Finally, muscle. Johannes played with the sliders for some time, until he finally found a mix he liked, that would take Jeff up to 400 muscle-laden pounds. Johannes would easily have the biggest, best love slave in town. As Johannes considered more tweaks, he heard a groan from Jeff, and the sound of his stepbrother stirring. Johannes knew he had no time to waste. He quickly hit the button to apply the changes, before Jeff finished coming to.
Jeff grunted, then stood up, glaring down at his stepbrother, feeling the lump growing on his head. He snarled, and stepped forward, ready to teach the older stepsibling a lesson, when a tremor suddenly ran through him. He stopped, confused, then groaned softly as his body began to swell, becoming taller, broader, and much more muscular than before. "What're you..." he started to ask, but his voice dried up as his body shook, his mind blanking for a moment before regaining control over the growing boy's body.
Johannes took a step back from the computer, but the grin on his face was unmistakeable. "Jeff, get on your knees!" he barked out. Much to his surprise, Jeff found himself complying, slowly going to his knees in front of his stepbrother. Johannes laughed, watching his brother obey. He pushed his crotch forward, until it was a mere two inches from Jeff's face. "Kiss it," Johannes hissed, shaking his hips in a way that made his cock and balls push forward, center stage. Jeff hesitated for but a moment, then dove in, kissing his brother's bulge, lavishing attention on it. Johannes could feel himself getting harder, looking down at Jeff's gloriously-muscled, 400 pound body didn't help--it just made Johannes that much hornier. Johannes reached down to pet the top of Jeff's head approvingly. Everything had gone according to plan; his stepbrother was now a massive muscle slave, eager to serve him.