After changing Derek, Runt and I found another guy in the showers. He was late 30s, 6ft, Italian looking, with rich caramel coloured skin, slicked back medium length brown hair, handsome chiseled face, and a sculpted short beard. He was definitely a body builder
"Jackpot" whispered Runt, admiring his muscular naked body as he faced the wall, warm water cascading down his wide muscled back and round bubble butt. He whistled as he raised an arm to wash his hairy pits, completely unaware of me and Runt, who was rubbing his cock at the sight of the wet steamy muscle stud.
"Well, go get him big guy" said Runt slapping a hand on my back. Approaching the muscleman, I positioned myself behind him, trapping him between the wall and my giant muscular body, towering over him. Feeling my roid gut and pecs press up against his naked back, he gave a startled yelp, before realising what was going on.
"Hey, che cazzo!" he barked in a Italian accent, trying to turn, but was pinned up against the wall. I felt my tiny roid cock grow hard. "Get away from me!"
Ignoring him, I let my huge hands wander down to his wet hairy chest, and began playing with his milky chocolate coloured hairy nipples, squeezing the hard nubs between my fingers.
"Oww, stop... what are you" he panicked, trying in vain to struggle free. "Someone help!"
"Nobody's coming... hold still" I grunted, using my huge mass to keep him trapped.
"Ill make sure you rot in a cell asshole!" he growled, his face pushed against the shower wall.
"No you won't" said a smug voice.
Suddenly the man stopped struggling, as his shouts of protest became moans of pleasure. Runt had matierilsied next to us, leaning casually against the wall, smiling as he withdrew a hand from the man's forehead.
"Whats your name, tall, dark and sexy?" he asked, slowly jacking off his huge cock, dripping cum into the shower drain.
"Ahhh... Marco... Ungh... my name is Marco" he said, breath short between moans. Runt looked at Marco's cock, it was a bout 6 and a half inches, uncut and pressed between the wall and the Italian's perfect 6 pack abs.
"Fuck my ass mexican fag" I grunted, shoving the man to the floor on his back"
"He's Italian you block head" said Runt, rolling his eyes.
"Whatever, he got good cock" I growled, before pulling my shorts and squatting over him. I pushed Marco's cock into my huge muscle ass, and began riding it as hard as I could.
Marco began to man louder, completely lost in ecstasy.
"Oh fuck ....yeah... ahhh..." he groaned, as he began to thrust up into my ass, his bubble butt slapping against the floor of the shower. I began to grunt loudly, as my tiny cock spurted out a volley of tainted roid cum, landing in Marco's mouth.
As soon as he swallowed, He began to grow underneath me. First, his neck thickened so wide it dwarfed his head. Then his lats and deltoids grew, his back widening to freaky proportions. His already meaty pecs then started to inflate, bigger and bigger, till they formed a huge shelf of muscly, roid induced man tits. His arms grew colossally big, every vain visible, dotted with many syringe marks, biceps bulging so big it was hard to flex them. His abs then bulged out into a hugely distended roid belly, as his legs grew thicker then tree trunks.
I watched as the once beautifully muscled man became a raided out tank beneath me, his once perfect skin now blotchy with severe roid acne. His face became less handsomely chiseled, and more like an ogerish brute, as his hair began to thin, receding far up his forehead, becoming almost greasy with sweat.
Marco then let out a loud moan as he shot his load in my ass, his balls shrinking with every spurt, before they become the size of small marbles, his cock shrinking to baby dick size inside my ass, before popping out, too small to stay in there.
I stood up, giving a hand to the newly roided muscle beast.
"What happened" he grunted in a low gruff voice.
"You felled in the shower so i wanted to ride your cock, too small though" I replied
"Your cock is smaller asshole" grumbled Marco, pulling on a red stringer vest that said roid bull in big white letters, a buffalo skull above it. "Besides who need cock when you have these" he said flexing his monstrously huge arms smiling, before heading back to the gym, unaware that his butt was still naked and wet.
"Big and dumb, just how you like 'em" commented Runt, watching the new roid heads ass as he walked away. "Should I give him pants?"
"Nah, he got nice ass, good to look at" i replied, folding my huge arms.
"So... that's the last gym guy" said Runt, leaning casually up against me. "what now?"