Tony watched with lust as Ben lurched toward him, his body becoming bigger, stronger, and manlier with each step. "Is this what you want, Tony?" Ben asked, his voice deep and arrogant, "You want a fucking muscle freak like this?"
Tony could only nod slightly, as Ben drew near. Ben smiled, his perfect teeth flashing.
"Good, because I'm about to thank you nice and proper," Ben promised. "But first..." Ben reached out with his big, strong hands, and grabbed Tony. Tony didn't resist, of course, because there was no point - he only came up to Ben's massive chest, and had nowhere near the strength to take on the larger man. Ben pulled Tony close, and forced some strange powder down Tony's throat. Tony choked it down, and Ben smiled at him, a feral, hungry look in his eyes. "That strength enhancer will help you survive the thank you I'm about to give you." Tony could feel his body becoming more powerful, although he was still nothing next to Ben, whose growth was finally slowing. Ben's nipples were now at eye-level to the already-tall Tony.
Ben reached down, and lifted Tony up, pulling the smaller man against his huge body and oversized, erect cock. Tony's own cock was quite hard, and he nearly lost his load when it was mashed against Ben's insanely powerful abs. "Oh fuck..." Tony gasped.
Ben chuckled. "Fuck? Absolutely!" Ben brought Tony down onto his own massive pole, forcing the thick, flared head into Tony's muscular ass. Tony gasped in shock as he was slowly forced apart, the overwhelming power of Ben's megacock pushing relentlessly into him. Tony cried out in pleasure, as he felt himself slide down the thick rod. Ben walked over to the counter, Tony still impaled on his cock, and grabbed a pair of packets. He then turned, and pushed Tony up against a wall, his huge cock still lodged in Tony's ass. Ben really began to work Tony over now, ramming his big boner into the smaller man, pushing Tony into the wall with each stroke. Tony could only grunt and gasp as the larger man pounded away at his ass. The feeling was incredibly erotic, and he wanted more. Tony began to vocalize his wishes, crying out "Oh fuck, oh fuck, oh fuck!" and "Oh fuck me!" and "More! Oh more! Oh fuck me more!"
Ben smiled at Tony evilly, and asked, "More?" He paused his fucking long enough to tear open the two packets he had taken and devour their contents. "If more is what you want, then more is what you get!" he roared. Ben started really ramming himself into Tony, pushing his huge cock in as far as it would go. Tony could feel that massive muscledick swell within him, and realized with a shock that Ben was growing again! Bigger and bigger Ben swelled, his already huge muscles taking on unreal proportions, as the new packets did their work. Each stroke became stronger and stronger, until finally the pair of them crashed through the wall and into the storeroom. Ben didn't even pause though, and kept fucking Tony harder and harder, pounding the smaller man into the floor. Ben was becoming frenzied now, frantically thrusting while grunting and growling in agony, desperate for release. With a mighty roar he came, his massive, swelling cock shooting its load deep into Tony. Ben continued to pump, as his big balls provided more and more cum. After nearly two minutes, Ben finally slowed, and then stopped. He lay atop Tony, his huge bulk pressing down on the smaller man with incredible weight, his huge dick still lodged in Tony's ass. "Thank you," Ben said at last, smiling.