Jeff charged into his room and as expected, found Chris sitting at the computer, fiddling with the Chronivac. "What the hell do you think you're doing?!" Jeff demanded, moving forward with angry purpose, reaching out to pull his little emo bro away from the magic machine. Just as Jeff's big hand wrapped itself around one of Chris' scrawny shoulders, the smaller brother clicked the mouse.
Within moments, Jeff was changing. His tall, massively-muscled body grew upwards and outwards. He became taller, broader, and even more muscular than before, if such a thing was even possible. His freakish body became even more bloated with powerful muscle and supersized cock, as the changes Chris had entered into the computer took effect. In less than a minute Jeff was every bit as big as Dominic, and shortly thereafter he was even bigger.
Chris looked up at his enormous brother, grinning broadly. At seven and a half feet tall and twelve hundred pounds of solid muscle, Jeff was superhumanly huge. At twenty-six inches long, Jeff's dick was a terrifying work of pornographic sculpture: thick, veiny, potent, and absolutely inhuman in size. His monstrous balls churned, pumping his body full of testosterone as they produced a vast load of cum. His body wasn't all that had changed, though. He felt compelled to dominate: to claim lesser men, to control them, and ultimately to fuck their brains out. His anger at Chris for messing around with the Chronivac was replaced with lust--raging, unquenchable, utterly insane sexual hunger.
Jeff roughly threw Chris over one of his massive shoulders, his big hand reaching up to grip his brother's fine little ass, holding him in place while his other hand typed some commands into the computer. He activated them, then carried Chris back to his own room.
Dom was waiting, idly stroking his big dick with one hand while raising his other arm, flexing, and kissing the huge, hard bi that rose there. "I'm horny... I gotta fuck..." Dominic said simply, watching Jeff and especially Chris with undisguised hunger. Jeff chuckled softly, recalling how he'd increased Dom's horniness level, not to mention his desire to top another man. Jeff thought it made Dom more of a kindred spirit, not to mention a good tool to discipline his mischievous brother with. Jeff picked Chris up off of his huge shoulder, and then flung him to the other massive man.
"Let's see how stretchy he really is," Jeff smirked. He walked up to Dom and grabbed Chris' ass. Slowly he lowered his brother onto Dom's giant tool, smirking as he watched Chris take the girthy column with ease. Then Jeff grabbed Dom's cock with one hand and his own with the other and brought them together. Slowly he pushed his huge dick up into Chris where it joined Dom's big piece of meat. "What do you think of that, little bro?" Jeff purred, as he and Dom began to make out, running their hands over each others' massive muscles. Impaled on two giant cocks and surrounded by enormous expanses of muscle, Chris could only moan softly as he felt two sets of giant, hairy pecs surround him. Jeff laughed. "Don't worry, you little size queen, I've got more in store for you!"
Slowly, Jeff and Dominic began to pump their dicks, holding Chris down as they jointly fucked his accommodating hole. As they thrust, their already-massive bodies began to grow, just a little bit each time, but enough to become noticeable the longer things went on. Jeff in particular was growing even more than Dom was, his muscles swelling larger and larger as the two massive men went at it with their small fuckbuddy. For his part the little emo was in erotic heaven, feeling the dicks thrust into him swell just as the men fucking him did. He reached up and grabbed one big nip from each man, pulling on it hard, twisting it around enticingly, eager to be fucked harder. Jeff and Dom growled aggressively as their huge pecs were toyed with, but ultimately eagerly obliged Chris, fucking him hard and rough, using the power in their massive bodies to ravage his accommodating ass.
When the massive muscle monsters finally came, they let out twin roars of rage and exultation, announcing their conquest of the ass they shared. They kissed vigorously, forgetting Chris for a moment as they drank in the bliss of orgasm, mashing his lithe, flexible body between their massively-muscled torsos. They filled him with copious amounts of cum; Chris' belly swelled with the stuff.