"This feels so fuckin good..." was all Marco could groan in his state of complete male ecstacy, fondling his huge, swelling muscles and bloated equipment unabashedly.
"See didn't I tell you man, it rules!" added Adam. His excitement was now quite evident as his long, powerful cock throbbed at the sight of his friend's now obscenely large muscle body. Marco was a total monster! By pure instinct his massive cock spurted its giant load into Marco's tight muscle-ass. Excess sperm sprayed out his crack and flooded down to the floor, splashing loudly against the walls, and then sticking like hot melted cheese to everthing in the room.
With that, Adam's body grew more muscular and thick. His balls dropped and were now the size of the largest mangos, and his dick throbbed at a proud 14", semi-flaccid. He was still no match for Marco though who had now excelled in front of Adam in every possible department.
As Adam heaved deeply from the exertion of his massive cum release, Marco turned his head around to face him.
"You call that an ejaculation!" he said with a cocky smirk, revealing his now realised ultra-masculine state.
"I am the most powerful man on earth!" he roared, as a wave of incredibly erotic narcisism flickered in his wild eyes.
As if by a simple command his giant man meat throbbed and grew, until it stood upright, almost touching his chin. His balls swelled also like a balloon, thick blue veins pulsing around their giant circumference. His huge, thick mushroom head spurted a powerful stream of hot cum in a high arc in to the air. The cum then splashed to the ground like gigantic water bombs. Even Adam couldn't help but cower a little at Marco's bold display of manhood.
The slit of his cock head was like a crack in a huge dam. The water gushed and sprayed from the relatively small opening like there was no end to it.
The ejaculation also seemed to be having the same effect on Marco that it had previously had on Adam.
Marco's body began to swell once more. He moaned in pleasure as he looked below him to see his dick, still spewing copius amounts of cum, was still enlarging... getting bigger and rounder, until it finally prodded the bottom of his chin, spraying his own cum all over his face. All the while his ejaculations became more powerful and potent, and his balls continued to expand to accomodate more gallons of cum simply for the purpose of total sexual male pleasure.
While just moments ago Marco had been only half the size again of Adam, his now godly muscle-body was now well over 4 and a half times his size. His giant dick throbbed with urgency, wavering from side to side at mouth level as if inviting him to try it.
Marco pulled his unbelievable mountainous biceps up into a double biceps pose and at the same time flexed his whole body so it looked like some sort of gigantic organism, rather than a human, that had grown completely out of control.
Marco's hand stroked his balls then gripped them with his hand to get a rough image of their weight, as now he could no longer see this far over his unbelievable chest.
"Shit they're the size of fuckin cars!...even bigger" He said gleefully.
He looked down to his nipples to see they had grown larger and more sensitive. They stuck outwards and down towards the ground, begging to be sucked, worshipped...like his entire muscle-god body.
His whole massive body dripped with cum, and his dick now would not stop shooting precum (that's right, he SHOT precum now).
Adam looked up in awe at his friend who was once smaller than him. He bagan to feel jealous of his newly-found cockiness and pride. He would have to show him who was really the biggest man on campus. And he knew just the way...