Hiro lay back on the bed, looking up at the monster that loomed above him. Guy was grinning, a handsome face set upon a huge, gigantic body, nine feet tall, bulging with muscle in every direction. Guy was beyond big, beyond huge. He was massively gigantic, and not just his muscles - Hiro couldn't help but notice the incredibly thick sixteen inches that jutted from Guy's crotch. Unable to stop himself, Hiro reached out with both hands. One touched one of the massive arms that surrounded him, feeling how big and hard the huge muscles were. The other grasped the tip of Guy's oversized cock, feeling the fleshy knob, running down to the thick, veiny shaft. It was real, all right.
Guy groaned slightly, as Hiro explored his huge, hard muscledick. "Fuck," he rumbled, "that feels good." His big cock twitched slightly.
Hiro licked his lips nervously. Here was Guy, who he had lusted after for so long, atop him, ready to go. Hiro was thrilled, turned on, and terrified all at once. That cock was so big, he wondered how he would ever take it.
Guy apparently noticed his distress. "Don't worry, dude," the big man chuckled, "I've got a whole tube of lube with your name on it!" Guy picked up a large tube, and started slathering the contents on his cock. "Help grease me up, little man."
Hiro rubbed the thick salve up and down Guy's cock, feeling how hard and thick it was. Above him, Guy's breathing became heavier, and his muscles began to twitch and tense, as he became more and more aroused. Hiro's own cock was freakishly hard, tenting his speedo dangerously. Guy reached down, and pulled the stretchy speedo from Hiro's body, freeing his pained cock at last. Guy smiled down at him, "I'm glad to see you too, dude."
Then, Guy lifted Hiro with his massive arms, positioning the smaller man above his huge cock. "E- easy..." Hiro stuttered, as Guy's huge fuckrod approached.
"I'll go slow," Guy promised. Deep down though, he wondered if that was possible...he was so horny. He lowered Hiro slowly, until the smaller man's ass touched the plump head of his dick, sending a small jolt of pleasure to Guy's brain. Encouraged, he let more and more of Hiro's weight bear on his cock, hoping to enter.
Hiro could feel the giant man's cock at his rear entry. It excited and terrified him at the same time. Slowly, he relaxed, and it was quite a shock when he felt the big head push into his ass, entering him. It was so big and thick, it felt like it was going to tear him in two. Above him, Guy was grinning madly, his face almost feral with lust. Slowly, the huge musclefreak lowered Hiro onto his cock, the smaller man sliding down the greased sixteen inches bit by bit, each inch a symphony of pleasure and pain. Guy threw his head back, his breathing becoming rapid, as he felt the smaller man squeeze his cock with his ass. "Fuck yes..." he hissed.
When he was halfway in, Guy changed positions, lying Hiro on the bed again. Holding the smaller man's legs, Guy began pumping his cock further and further in, using only a fraction of his immense strength to power his thrusts, mindful of Hiro's relative fragility. Despite this, to Hiro, it felt as if he were being fucked by a jackhammer. With each thrust, Guy slid a little further in, until finally he was mashing Hiro's prostate. The smaller man howled with ecstasy, as he felt Guy slam home. With a grunt of satisfaction, Guy began to really pound Hiro, his huge cock sliding in and out faster and faster, mercilessly pummeling Hiro's joybutton. Hiro, barely coherent, nonetheless managed to worshipfully run his hands across Guy's massive, brutish shoulders, feeling how big and hard the muscles were, then traveling down to the bodybuilder's huge pecs, thick and bulging with power. Overwhelmed by the sensations in his ass, the feeling of Guy's huge, hard body, and that amazing musk that turned him on so, Hiro came, spewing spunk onto Guy's hard, deep-cut abs. The big man was close himself, ramming his pole home with increasing vigor. "I'm cumming!" he roared, as his huge cock spasmed and then exploded, the huge load filling Hiro's ass with hot, creamy cum, the volume of which was so large that it was soon leaking out and onto the bed.
Guy's impressive organ kept pumping for the next minute or so, until at last his big balls were empty. Deep within, he could feel himself getting stronger... He looked at his body. He didn't look all that different, but he knew that he could lift more. Apparently, when he asked for the potion to make him get stronger during sex, it resulted in just that, nothing more (or so it seemed.)
Guy looked down at Hiro. The smaller man lay beneath him, still impaled on his cock. His eyes were rolled back into his head slightly, and there was a faint smile on his lips. Guy smiled at him, and then slowly pulled out. New cum leaked out of Hiro as he was unplugged, but he didn't care. He looked up at the smiling musclegod who lay to his side. "That...that was incredible..." he managed at last, his voice a tired murmur. Guy just smiled.