Brad shook Rick's hand, and could tell from how soft and delicate it was that the smaller man wasn't used to doing manual labor – his grip was weak and soft, like a fish, Brad thought with amusement. Rick was definitely a thinker, but also clearly lusting after Brad's hot bod. And who wouldn't? Brad grinned, knowing he could make some money off of the smaller man.
“Ow, don't crush my hand!” came Rick's pained plea, interrupting Brad's train of thought.
“Sorry, man. Sometimes I forget how strong I really am,” Brad grinned, not looking terribly sorry at all. “Now how about we get down to business – monkey business, that is.” Brad grinned at Rick wolfishly. He inflated his huge chest, his big, juice pecs jutting out under his shirt, thick and powerful. He slowly flexed his big, strong arms, his bulging biceps hard and round, stretching his sleeves as they rose. He brought his arms down and flexed his triceps, the big muscles thick and firm. Rick's shorts betrayed his growing excitement, as his crotch mirrored the action of Brad's muscles, bulging outward and inflating.
Rick couldn't hold out much longer, and invited Brad up to the bedroom. The large jock grinned and followed, not seeing Rick pocket a vial of gas on the way up. As they reached the top, they passed Brandon's bedroom, and Rick noticed that it was empty. He briefly wondered where his pain in the ass son had gotten off to, but those thoughts fled as he entered his own bedroom, and Brad began stripping. His shirt flew to the side, revealing his powerful, thickly-muscled torso. Then his pants came off, after his shoes and socks, revealing mighty legs, hard and rippling with strength. Brad stood in the center of the room, wearing only a jock, a cocky smile on his handsome face, as Rick drank in the sight of the big stud's nearly naked body. He wanted Brad so bad.
Brad had ideas of his own. He lunged forward, ripping clothes from Rick's body. Rick was surprised, but also aroused by the way Brad was manhandling him, the way the big man casually destroyed his clothes to remove them. But Rick felt a shiver of horror as the vial of gas fell from his pocket to the floor, and rolled under the bed. It was only through a stroke of sheer luck that it stayed intact and capped.
Rick bent down, hoping to retrieve the vial, but was intercepted, hoisted into the air by strong arms and dropped on his back on the bed. Brad loomed over him, his jock strap gone, his impressive manhood drawing Rick's eye. Brad gripped his big cock firmly for a moment and then released it, letting his ten inch tool bob up and down. And it was still growing, Rick realized, getting even bigger and thicker and longer. “I want you to get a good look at what you're about to take,” Brad purred cockily, before bending over to grip Rick firmly.
Rick was like a rag doll in Brad's powerful hands, as the larger, younger man flipped him onto his stomach and placed his huge cock between Rick's cheeks. “This'll hurt you more than me, but that's what you're paying for,” Brad joked blithely, as he rubbed his hard fucktool against Rick's hole. Rick groaned softly, not sure whether to fear or embrace what was about to happen. With a devilish chuckle, Brad slowly pushed his big dick into Rick's ass, as the smaller man cried out in shock, having never before experienced such an immense invasion. The big muscle jock continued without mercy though, forcing himself deeper into Rick, as the latter cried out and writhed, pain and pleasure coursing through him.
Brandon, meanwhile, had been in the basement. He had spied on Brad and Rick's conversation downstairs, and had hidden to avoid detection. In the basement, Brandon discovered his father's notes about the experiment, and an idea popped into his head.
Rooting through the items on the lab table, Brandon found several vials of gas, and congratulated himself on finding his dad's secret formula. What he didn't realize was that although each vial was full of pink gas, and was comprised of the same main compound, each had a different agonist, and would have a different effect. Moreover, there was still some gas from the first vial in the air, and although it had dispersed somewhat, Brandon had been breathing the air for the last fifteen minutes, and had taken in a good bit of gas. He choked and coughed a bit as the amount in his lungs began to accumulate. He left the basement, choking, grabbing two vials of gas on the way.
Brandon headed out of the basement to see what Brad and Rick were up to. Already, Brandon's mind was turning, as he tried to figure out how to use the gas to get Brad's muscular body. Once he was a buff stud, he'd never have to take any of his dad's crap again, Brandon thought. As he walked through the kitchen, he could hear the sound of Rick's bed creaking, and low moans, echoing softly off of walls. “Shit, sounds like Dad's having a good time up there. Well, this won't be the first time that I crashed the party,” Brandon thought to himself, as he headed up the staircase.
Brandon stole up the stairs quietly, following the sounds of rough sex to the bedroom. He peeked through the doorway, and was greeted by the impressive sight of Brad screwing his helpless father. The big muscle stud looked amazing with his clothes off, his strong muscles in action as he gave Rick the fuck of his life. Brandon wanted that body for himself, and knew he'd have to get closer to pull this off. He slowly crept toward the two men, one step at a time, as Brad pounded away, harder and faster, grunting as he screwed Rick's ass. With a loud groan the big man came, his oversized tool pumping a thick load of hot cream up Rick's behind. Brad lay atop Rick, panting softly, his big body holding the smaller man down as his spasming cock continued to pump its seed into Rick. Brandon saw his chance, and crawled along the floor toward them. He was surprised to see the other vial lying under the bed.
“What the hell is that doing there?” Brandon thought to himself. The answer came seconds later, “Dad must've been hiding that to use on Brad. Well, I'll make sure that doesn't happen.” Brandon shimmied under the bed and grabbed the vial, and added it to the other two he already had.
Above, Brad was already recovering, and starting to pump Rick's butt once more. His thrusts became stronger, more forceful, more violent. The bed squeaked loudly, nearly drowning out Rick's screams. Rick was clutching at Brad, trying to push the big man away, but also wanting him closer at the same time. It hurt like hell, to be fucked by such a big dick, especially one driven by such a powerful body. But it hurt so good. Rick's ass had accommodated a number of men, but none like the hung muscle jock that was fucking him now.
As Brad fucked Rick, the bed shook violently, due to the action taking place on it. It was too much for the mattress to take, and some of its springs began to pop, pushing through the thin fabric on the bottom of the mattress. One of the springs mashed against Brandon's stomach, breaking the three vials, sending gas everywhere.
“Get me out of here!” Brandon yelled, coughing.
Brad got up off of Rick, and looked under the right side of the bed, while Rick rolled over to look under the left. All three coughed violently, breathing gas in and out, getting whiffs of each of the three gasses, but in different amounts.
Brad easily lifted the king size bed up, freeing Brandon. Rick pulled his son up off the floor, looking angry, but also coughing weakly, expelling the last bits of gas. “What the hell were you doing under the bed?” Rick asked angrily. “This is the last – wait... something's not right...”
Brad was feeling strange as well. “Yeah, I know what you mean. I feel it too...”
Brandon was feeling odd also, but before he had a chance to add his own comment, the changes started...