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Part 1 The Hulk grinned as the human seemed to understand what he meant and wanted. He followed Richard into the other room, turning sideways to fit through the door frame. Even that wasn't enough however, as he felt his rock solid pectorals bend the metal frame to allow passage. "Human good. Human know what Hulk want." He rumbled, ruffling Richard's hair gently. "Now give it to Hulk." Now centered in the large lab chamber, Richard could see the destructive hole left behind by his colleague's enormous endowment. Turning his view to the other side of the room just parallel to the opening, he could see the still fresh discharge dripping down the wall. Such power he thought. The walls were at least half a foot thick of pure concrete and yet the giant could still puncture through with his erection alone. Going further might result with even more demolishing results... The Hulk huffed and stroked his endowment gently, panting ever so slightly as his erection and need continued to itch at his mind. "Human turn machine to full. Hulk take anything machine give." He grunted flexing an arm and admiring the sheer mass of his bicep. He slowly started to chuckle, edging closer to another release. He grunted and forced his hand away. He didn't just want to feel good, he wanted to feel great. The beam, the growth and the worship from the human would do that just fine. It was hard for the smaller man to think straight with Hulk so uncomfortably close to his being. He could already feel the scorching knee-low hairy sack of his titanic friend nuzzling against his lower lumbar. "Go over there and I'll turn the machine on", Richard said as he turned back to face his looming green partner. The Hulk grunted, walking further into the room, his shoulders hunched to allow his massive frame to fit into the room with ease. He pressed himself gently to the human, oddly enough enjoying the feeling of one too small being so close to him. "Hulk go stand, no tricks or Hulk smash you." He growled, tensing an arm in a vicious demonstration. He stepped onto the platform, surprised it could hold his weight, at least for now. He was happy to find he had a bit more headroom, at least he wasn't constantly hunched over. Each switch, dial and keyboard input was set to the appropriate setting. Richard swiped his hand over his forehead, wiping the sweat from his blushed face. His mind was racing at the possibilities of what he was capable of giving to his brutish assistant. it was hard for him to tear his focus off of the erect green hunk waiting for his next dose of radiation. He was immense already and that result alone was just from one single instance of radiation exposure. Not only that, the console's dial was still only set to the 1 setting. There were at least 10 levels available... "Why waiting! Hulk want!" The bellow, his body twitching eagerly. He growled as he adjusted his stance, preparing himself to feel the climactic rush, the growth, the building of overwhelming power within his body. He felt his massive shaft dribble eagerly, pre-cum leaking from his slit. "Hit Hulk with best shot!" Before turning on the machine, Richard adjusted the turn knob to the 2 setting, convinced that no matter what size Hulk would be, it wouldn't be enough for him. "Here we go..." He said under his breath as the scientist flipped the switch and activated the machine again. The machine hummed and buzzed, bathing the green giant in the highly concentrated gamma light. He threw his head back, groaning loudly as his body throbbed, flexing his chest as the radiation soaked into him. Wordlessly, he snarled and began to caress his body, his muscles and his cock. As he lavished himself, he began to feel heavier, his balls already hard at work, dropping lower and filling faster then before. It was a rapturous display being presented to the human. The build up was slow but the ecstasy was almost palpable. Richard could only stare on longingly, pinning his hips against the console as he too was hot and bothered from the Hulk's libidinous submission. "Human, come help Hulk! Hulk want to feel how big he is!" He chuckled as he widened his stance, his body eagerly resuming the slow growth from before as he filled his cock, slowly running a large palm along his titanic manhood. "I-I think I'll stay over here if you don't mind." Although as compelling as the offer stood, Richard had no intent to receive the same growing treatment. He had every intention to cater to Hulk's hunger for size. The Hulk growled, but understood. He was the very epitome of power, anyone in their right mind would be terrified to approach him. He grunted as his shoulders widened, muscles surging in size, neck slowly reaching up to swallow his head, only for his neck to lengthen and head begin to widen. Hulk panted, still focused on his ever growing shaft, caressing the thick veins that ran along its sides. Richard buckled his hips as he saw Hulk enjoying his ever increasing size. Licking his lips, the dial was then set to 3, the radiation pouring out more excessively now. Although it seemed as though the machine was slowly growing the monstrous man, its function only served to amplify the beast's sex drive. Each stroke of his hand pumped his frame to bigger and wider proportions with every caress more powerful than the last the longer he remained under the machine. His cock only hardened more and once his climax has reached and his member plush and soft again, the need to fill it with blood and pump will only worsen, practically making the giant addicted. Hulk let out a strained groan as his muscular mass increased at a quickening rate, every stroke, tug and squeeze of his manhood brought further growth to his frame. His steadily increasing weight bent the metal platform he stood upon. He shudders as his shoulders widened further, cracking his knuckles as he increased further in size, palms wider then a manhole cover. "Mmmmmore!! Hulk want more!" Richard wanted more as well. With no regret, the dial was switched to 4 as the spill of radiation continued to fan the flames of Hulk's sex drive. Naturally, the brute's body was further endowed to cater to his constant cravings. More curly hairs appeared across every inch of his body. His odor only enriched and invaded his nostrils with an exhilarating scent. Of course, even witnessing his very growth and massive musculature served to make the beast enraptured in bliss. The Hulk let out a bestial, primal roar as his growing passion was only further increased. It was maddening, consuming and mind-boggling. He furiously worked his shaft, oblivious to the hair sprouting along his swollen pectorals, between the deep crevices of his abs, tracing the near perfect horseshoe of his traps. He found himself widening his stand as his quads pumped full of raw power. He groaned and moaned panting and shaking. Richard only committed to their antics further. The dial went up to 5, then 6. 7. 8. He couldn't help himself. This was his only opportunity to see their experiment to its fullest potential. The scientist's eyes only widened at the sight of Hulk's massive arms raising and lowering, the biceps mashing against the pillowy huge pecs which flexed up and down into the grunting face of his partner. His cock was practically peaking past his head and his low hanging hairy testicles were bloating near the floor. It seemed like he was about to blow at any second. The Hulk could feel the building pressure throughout his body, from the tips of his sprawling toes to the very top of his dark forest cock. He shut his eyes and grinded his teeth together, fighting against the ever increasing climax that was building at the base of his cock. He roared and cried out, placing a hand on his tip, surprised to find his cock head was bigger then his palm. That moment of shock was all it took. His guard dropped and his balls pulled tight. Every muscle on his body expanded faster than his skin could keep up, making it look like his entire body was flexing. His eyes rolled back as he cried out, his shaft pulsating as thick jets of cum blasted from his tip through the ceiling. At that point, the trajectory of the discharge collided against the machine, damaging the emission of radiation above him to where no setting could hold back what was being expelled into the green monster. The mighty climax followed the same response previously, enlarging every facet of the Hulk's body at a quickening speed. Every hiccup his length made only pulsed his frame bigger. What cum hadn't escaped the enclosure only fell onto the giant. His cock had already punctured a new hole where his ejaculate carved out and his head was reaching to be next. Unleashing a guttural growl, the Hulk moaned and grunted as his body increased in mass almost uncontrollably. His voice deepened as the ceiling drew closer. Hulk bent forward as his back pressed against the ceiling, pulsating, stretching, thickening. Concrete gave way to flesh as he pushed up into the ceiling and through the building, pipes, wires, rebar and so much provided no resistance as his size continued to exponentially increase. The Hulk's head quickly vanished past the destroyed ceiling where his disproportionately enormous pecs were soon next to press firmly into the remains of the roof. What space was left inside the open chamber was quickly being filled with the titan's hirsute mass. Below his rocket of a cock, the vast pillowy sac was rolling outwards towards the scientist, finding any room it can to spread itself out. Despite being unable to see it, Hulk's ever thickening legs could feel the scorching hot balls overtake his stance, bulging between his limbs and underneath his taint. His loaded hairy ass had matched the protruding distance of his back, both pressing hard against the wall behind him with cracks forming against the aggressive swelling. The feeling of his body stuffed inside the crumbling confines of the room only catered to the Hulk's libido, making his impressive spire of cock shoot his loads even harder, more copious. His cock shivered, trembled and leaked like a river. Sweat rolled down his body as his bones cracked and snapped, expanding along with his body. The Hulk wordlessly bent down, pushing the roof out of the window, reaching down to grab the scientist that helped him. He smirked as he wrapped his hand around the puny human, hoisting him out of the soon to be destroyed lab. "Human help Hulk. Now Hulk help human." The green giant bellowed as he placed the man of science on his overly developed pectorals. Thirty feet above the ground, Richard could finally see what kind of experience it must had been for such an immense giant. Snuggly fit between the moist crevice of his partner's chest, the musk was the first thing to really hit the tiny man. Being so rich with hair and sweat, the smell of pure man was almost lethal. Still Richard welcomed such a beautiful odor even if was hard to breath at first. At last, being so elevated on top of his idol, he could gaze onto the dripping face of the Hulk, chiseled and stubbly with a vast jawline, shelf-top brows and toned cheekbones. His test subject was handsome, neanderthal-like but still beautiful in every way masculine. His head was bigger than the doctor but compared to his body, it was the smallest thing about him. Forcing his attention away from the titan, Richard looked behind him to see the Hulk's length stretching upwards, six feet above the Hulk's head. Its lobbing of semen had died down to a dribble as the growth was nearing its end. Hulk had his upper body freed from the facility, the hot Arizona heat now more apparent than ever. Aside from his shaft, everything below the Hulk's waistline was still inside the ruins of the central chamber. Hulk panted slowly unsure if the sweat permeating his body was caused by his sexual release, the mind numbing growth or the desert heat. All three maybe. He glanced down at the man resting on his chest, slowly grinning at him. It felt like hours since the Hulk's heart beat wasn't racing. He could hear his blood rushing in his ears, fading slowly. "Human... did good." He said, slowly raising an arm to better look it over. "Hulk happy." He brought his bicep up to his face, slowly kissing the emerald colored muscle mountain. Such a tease the dumb hung giant was. The deep moans and slobbering sounds of his tongue stroking his peaking arms gave the doctor quite a show. Although still horny, the amount of size the Hulk had piling onto his shaft had made the monolith slump down to its flaccid state, making the entire package rival to that of his entire lower half. The uncut cock rested against what ceiling was intact of the facility, keeping it from joining the rest of his member. The Hulk nuzzled his massive arm, almost needingly. It was obvious he was in love with his power and size. He moaned as his massive manhood slowly dropped down, brushing against the roof of the lab. The contact sent an electric tingle up the green behemoth, making his hair stand on end for a moment. He paused from his muscular ministrations, if only long enough to nod at the human and resume fondling his perfectly split bicep with his tongue. Having an arm raised just to grace the bicep, Richard couldn't help but also notice the curly hairs peeking past the pectoral landscape. The bush below his arm must have been stuffed senseless. Although the up close display was erotic beyond belief, the doctor couldn't help but feel as though he's missing out on so much more of this green stud. "If I was just on the ground..." "Human want down?" The brute asked, hearing the voice in his own head. He blinked as he tried to process the fact. He slowly reached towards the human, holding out his hand for Richard to climb onto. "Y-yes. Yes! I do!" How could this be? Amazingly the Hulk somehow knew what he was thinking. With his left half shifting slowly with easeless flexing, a giant beefy palm glided flat near the chest. With his bicep and shoulder shifting towards his torso, his pec in response molded itself up bigger. Everything about him continued to impress the scientist. Being appreciative, the little man jumped into the lumpy lift that was the Hulk's hand. "Hulk heard you say tho...." Hulk slowly lowered the human to the ground, looming over him as he lowered him down to the roof of the lab, the sunlight dancing lazily through his forest of hair, both on his head and the stubble along his broad jaw and chest hair. He stood back up, staring at the puny human and slowly smirked, the size difference between him was exciting. Below, Richard was placed directly in front of where the Hulk stood, right next to the fat flaccid cock that laid itself straight down across the roof's pavement. Looking up, Richard can see the Hulk having been nearly as wide as he was tall. "You knew what I was thinking?" Richard asked in a quiet voice. Hulk looked down at the human, ears too far away to hear what he said. He was hit by the thought a moment later then nodded. "Hulk heard!" He roared with a grin. "This is incredible!" It was unexplainable how the Hulk knew what the little man was thinking but the only real explanation could be a new super power birthed from the radiation he had indulged in moments ago. The Hulk didn't worry himself about the means of his abilities, like the little human was. He cared more about how massive he was, how thick his arms were, how absolutely titanic and grotesquely powerful he was now. His shaft stirred already, the vague thoughts of power, his power, already so intoxicating. "God you've gotten so big Hulk..." Richard put a hand up to the wall of cock, a pulse shook the surface as the scientist felt it pass through his digits. Even his feet felt the vibration shake through the concrete roofing. "Hulk didn't get big. Hulk got HUGE!" He roared with a crab flex, his traps and neck bulging out, his cock slowly rising off the concrete as his libido returned in full force. "You're right! Hulk IS huge! Hulk should show off more." The giant green behemoth slowly turned, exposing his maze-like back, muscle rippling and shifting, changing the pattern from one moment to the next The sheer turn of the giant's body left quakes along the facility. The blood surged cock, still soft, slid across the roof and fell lazily against the side of the structure. Richard was treated to a back, twenty feet wide and rippling, hair dusting across the surface as it shimmered in the beating sunlight. The ass however was closer, a mesmerizing combination of solid fiber-like muscle and round fatness. Its size almost rivaled that of the back, mere feet away from touching the upper body completely. The crack was stuffed to the brim in hair, unsubtle in it's presentation. "Wow..." was all Richard could muster up. The Hulk guffawed, rolling his deeply striated shoulders, back rolling like waves. His arms rose as he growled, pumping out a titanic double bicep flex. The Hulk knew the human's eyes were glued to him, his planetary glutes, the sweep of his hair and the sheer mass of his body. "Hulk know what human want! Human want Hulk." His booming voice echoed across the empty canyon, announcing the desire Richard had for the green behemoth. There was no hiding it. He knew what the little man was thinking. Richard's pornographic thoughts were completely laid out for the Hulk to revel in. It was almost reverse psychology as Richard couldn't keep himself from hiding his hottest dreams. The forest colored giant slowly placed a hand around his massive shaft, lavishing his dark green tip slowly. This was what that tiny speck wanted. To witness all of his sexual glory and obscene might. He rumbles softly, shaking the air as he did so. “Little man like it when Hulk go slow, when Hulk make sure little man sees everything.” He cooed teasingly, slowly lifting his other arms up and behind his head, fighting his own mass to do so. Having Hulk reward the tiny human with a visage of manly captivation almost seemed generous to Richard. Although having the godly mountain of man do anything but pleasure himself would be illogical. The experiment had already made sure that Hulk's sex drive was at its apex and seeing little Richard's visions of his green master ascending higher and flaunting carelessly only turned him on even further. Hulk smirked, loving the attention, the thoughts directed at him knowing exactly how much space he took up in the tiny human's even tinier brain. He growled and pumped his arms and stared down at his massive, planet sized biceps. His cock throbbed and tensed. The Hulk reached out and gripped his shaft, working his shaft with both hands, moaning loudly. "Ohhhh yessss big Hulk, feels good... So good!" If the outside didn't already leave the two hot from the sun, Hulk's cock-pumping workout would have surely reproduced the same heat. The sweat piled on, pouring from every hairy orifice on the giant's body. With his cock already craning back up past his head, the slick burly hands started up his growth again, his pleasure fueling his size. The ruins of the building around his figure were but an afterthought to him, crumbling feebly as his growing body collided against them. Richard, still on the partially destroyed roof, watched in awe. "Yes, that's it! Keep growing Hulk!" The behemoth grunted and grit his teeth as the full body pressure of growth began once more, he screwed his eyes shut, working his monster shaft eagerly, His colossal pecs heaved and bounced as his hands worked his titanic shaft, he howled and panted, working his growing shaft harder and harder, faster and faster now. "Work that cock big boy! Show me just how big you want to be!" Richard egged the monster on. His mind raced and conjured subliminal images of Hulk twice as big, three times as big, catering to the hunk's bottomless cravings. 45 feet came and went with a cock past even that. Hulk's height carried his hairy balls up in full view for Richard to see though at this point, the poor human couldn't even see past the length of his god. Being so close, the smells had already made the human light-headed, sweat raining down on him, making the stench he loved so dearly permanently stuck to his being. "Guuwaaaarrrr!!! Hurrf hurrf!" He snarled and roared as his shoulder grew further apart, making space for his neck muscles to balloon out, almost swallowing his head completely. He licked along the tip of his thick cock, his flesh quivering and bulging faster now. "Hulk feel... like he gonna!!!" He cried out, the pressure growing faster now, the feeling of growing, strengthening, muscle piling on top of muscle mixed with the absolutely pleasure he way forcing into his cock was mind numbing. The man's eyes widened. His feet could feel tremors passing through the soles of his shoes, signalling the Hulk's next explosive surge in size. Having reached the fifty foot mark, the expansion would surely push against the rest of the facility, along with the smaller scientist. Still wanting to live to witness his partner's ascension, Richard bolted across the rooftop to find a ladder down before it was too late. Turning away, he could only hear moans, grunts and rumbles, the Hulk's shadow casting far from his position. Unrelentingly, Hulk couldn't keep himself from slobbering against his fleshly pillar, desperate to get his fill of sex in before he'd ultimately have to start over again. "Ah... ahhh! AHHHHRRGGG!!!!" Instead of feeling the sweet release of orgasm, The Hulk's growth once against flew out of control. Muscle exploding in size, limbs lengthening to make space for the new tons of flesh. "Awooorrgg!" He flexed, tensing his bulging pecs, admiring the slabs of flesh as they stayed swollen, only increasing in size as he tightened his 10 pack, releasing them. His biceps stretched out, almost tearing his skin. Hands and feet exponentially increased in size, hair covering everything of newly formed skin. Finally reaching the earthy ground, the shadow Richard saw before could be seen widening and stretching further away. He ran out into the open, away from the destroyed facility and turned as he did to catch a glimpse of the heaving heavenly hunk soaring higher. Testicles now matching the Hulk's own width demolished the building with its own size, concrete breaking away meter by meter, hardly an obstacle to the massive cum tanks. Richard stopped and turned, seeing the cock head bubbling and frothing as it was ready to make its first shot.
From a roleplay I'm doing with a friend. There's been a lot more written so keep an eye out for part 2 later on. The series includes, muscle growth, hyper and macro. It was mid afternoon deep in the Arizona desert. Doctor Banner had been out in this isolated lab now for the better part of two years, working out how to make monsters out of men. Improving the military's selection of men and surpassing the limits of human biology. anything to get a leg up on the looming danger of foreign agents. Rumor was they too were working on something similar. He was currently standing in front of a large computer console, adjust a vast multitude of dials and switches, adjusting his math on the fly to accommodate the varying inputs the system was being fed. "Alright... I've regulated the output and the correction algorithm is steady. I hope your math was as good as you say." the beanpole doctor said, his voice a little nervous. He trusted their work, but facing down the emitter itself was a little nerve racking. "Have faith Bruce. You've seen the numbers so there's no reason for doubt. After we succeed in the tests, you and I can finally get out of this place. I'm not taking any more delays just because the military can't decide on who should be their test subject." Although Richard was completely committed to seeing his work finalized, he too couldn't help but feel anxious going through with the final trial. After all, it was Banner's idea to take the test but the experiment was almost too good to be true. Banner might really be the next superhero in the world, but even then, what would that spell out for the rest of the military. "I know, I know. I'm human. Doubt always lingers, even when facts show there is nothing to fear. We see monsters in the shadows at night." Bruce sighed, adjusting his glasses gently on his face. The concept of super human powers was extremely glorious. His brain and the brawn they were artificially creating would be a tremendous force for good, as long as he kept his morals. That's why Richard was around. "Everything is set over here, how're things with the emitter module?" "As good as one can expect. Just step onto the platform and we can get started. I'll give you a minor dose and from there we can witness the results." "Right, base of our simulation resulted... At this dose my shoes should be tighter, but nothing else." he said taking off his glasses and setting them down somewhere safe. He left his lab coat on his chair as he walked over to the patch job platform they made. "Ready!" From the console, Richard turned the dial clockwise to setting 1. An audible hum buzzed above Bruce as the dish-like machine was being fed the appropriate power. After typing away on his keyboard, Richard set his hand onto a large switch mounted to the console. Looking up, both men saw eye to eye in anticipation. "Here we go..." "Alright. Lets play god!" Bruce shouted, giving a final thumbs up as the machines whirred and buzzed around him. Even though the voltage was low, the machine was rather dramatic. The switch was flipped. Visible green distortions in the air could be seen whirling around Banner in an instant. Although the machine was clearly working, the ray of radiation had no bearing on Bruce. Despite being affected, the only thing he could truly feel was a light headed sensation. Bruce winced gently, looking at the green flickers and glittering around his body. He looked at Richard's blur and shrugged. "Doing good." He shrugged gently. A good minute had passed and eventually the switch was flipped again. Richard could see Bruce completely untouched by the event. Although expecting noticeable alterations in Banner's physical appearance, super powers can sometimes be hidden away and thus further examination was necessary. "Well... for all the sound and spark the machine gave off, I feel relatively the same. could you hand me my glasses?" Bruce said, carefully stepping down from the platform. He wandered over to Richard's blur, wondering if he looked any different. "Well Bruce, you don't look any different, but we never really expected that much to change on a physical level." Richard reached out to hand Banner his glasses. "How do you feel?" "To be frank. Light headed and annoyed. I'm concerned we may have to go back to formula." He frowned as he slipped on his glasses. He shifted gently, his clothing felt a little off to him, but perhaps it was the treatment. "We may want to do this nude next time. My shift feels starchy." "Don't be so hasty. You might have gained something after that kind of exposure. We can't risk another dose until we know what's changed. Are you sure there isn't anything about you worth noting?" "Hmmm nothing of notice right now but I see what you're saying, give the treatment time to work." The doctor nodded as he slipped the lab coat back on as well. Bruce picked up a clip board going over the questions, post test. He shuffled a little, feeling a little warmer, but nothing concerning. It was later that day lunch had just past and the sweltering heat of the desert was rising steadily. Bruce was sitting at his desk in the lab, slowly pouring over their calculations, theorems and various documents and tests. By this point in time, he felt that something should have happened, there should have been a change, yet nothing at all. He kept his calm however, this was the first trial on an organic creature they tried. it wasn't a set back. Soon there'd be a swath of overly grown men, charging across battle fields. He grinned at the idea. heck if the test had worked, he would have been one. He felt his cheeks grow warmer as he pictured himself at superhuman sizes. Bruce coughed gently as he got up to answer. He twisted the knob and pulled it open, harder then he expected. "Yes?" He asked. "Sorry to bother, it's just been several hours since the experiment and I wanted to know if you've come to any conclusions yet on the test." "Nothing yet, I apologize." Bruce said to Richard, inviting him into his lab. Bruce found himself adjusting the AC in the lab, lowering the temperature further as he felt even warmer. "Warm today, isn't it?" He began to prepare the coffee machine. "Did you find any breakthroughs?" He said as he shifted his stance a little. Richard gave Bruce a puzzling look. "Nothing to work from I'm afraid. I will say, you have this room freezing cold right now. Are you sure you're okay?" "You find it freezing? I'm feeling really warm" Bruce huffed and sat down at the lab desk once more, stretching himself. "I kind of wish it had work though..." Richard leaned on the desk next to him. "It's hard to say. Maybe genetics are a factor. After all, you're the only one we've tested. I suppose we can try another dose later." Richard looked at Bruce and noticed sweat marks around his work shirt. "If you had these powers, what do you see yourself doing?" "Hard to say, but it would make assembling labs a lot easier." Bruce chuckled, slowly starting to day dream about hoisting large lab machines over head, being built like a tank and just... so big, so colossally huge. He didn't even notice his hand lowering down to his crotch, caressing his cock gently through his pants. "I can't imagine it being wide spread through military interactions. So many men getting that treatment. One can only imagine what life would be like living with such power on a daily basis..." Bruce nodded and chuckled in agreement. "Men the size of giants, walking around, training, maybe it would spread into the general populace," he smirked as he felt his manhood harden in full."God i wish it worked on me." He moaned softly, squeezing the fat head of his manhood. "I don't think it would-" Richard paused after he heard the rustling of Bruce's pants. "Banner what are you doing?!" Bruce was a little lost to his growing lust, slowly working his shaft out of his pants. "Sorry Rick, i just... really need to take care of this." He muttered, almost admiring his decently sized manhood. "Something had happened to you hasn't it! I mean I know it's been a while, secluded and isolated but where's your decency!" Regardless of his outcry, even Richard was impressed how fat Bruce's uncut malehood was. "I'm nowhere near the projected results. I think its just cabin fever..." he grunted, slowly letting Richard admire his manhood. From the few choice veins running along the shaft to his thick, fat glands and the green tint slowly spreading over it. "W-What's happening!?" Richard was in awe as the pinkish skin tone of Bruce's junk was slowly changing to a dark green hue, but it wasn't just Banner's cock that changed, even his skin was gradually shifting to green as he pumped his dick over and over. Bruce huffed and panted working his shaft faster now, the green spreading. His cock was slowly stretching, pulsating, enlarging between his fingers. "Uhhhfff Richard... I think... something's happening." The scientist backed away slowly from Bruce, witnessing the changes overtaking in his body. The masturbatory arm locked into a flex was noticeably bulging inside Bruce's tightening work shirt. His neck filled the collar, veins creeping out as his expression grew more intense. For every push and pull of his growing hand going up and down the enlarging cock, Banner's form only widened, clothes filling with his mass. Banner could feel the changes overtaking him, at this point he welcomed it, flexing and relaxing his masturbating bicep, watching the muscle swell and relax, then swell even larger. He could feel his shoes growing tight around his feet, his shirt struggle to stay clasped. he couldn't help but begin to laugh. His tongue hung out as his belt gave way to his widening hips. Bruce's bellow sounded almost deeper than his regular voice. Richard was still in awe, absolutely paralyzed and yet, overjoyed in some way. "My god Bruce, it actually worked!" Bruce was too far gone to hear what Richard was saying. All he knew was that he felt good, wanted to feel even better. He dropped his cock for a moment, brought both his arms up slowly, and pumped his biceps into twin peaks. Thinking was hard now, his mind addled by the sheer rush of power from his entire body. "Big now. Getting bigger!" Each ball of muscle tore seams across his long sleeve shirt. His hard cock stretched to a foot in length right in front of the flexing behemoth, twitching in wait for his touch. The brute that was Bruce had gained a foot to his frame and even the chair creaking and groaning suggested he had put on a tremendous amount of weight. All of this started just from Banner being hot and bothered and even as he sat there, hands off his meaty cock, his growth slowed to a crawl. Maybe masturbating really did set off a chain reaction. "Bruce, I can't believe I'm saying this but, I need you to... to keep touching yourself." The massive brute huffed and eagerly continued to work his shaft. He didn't need a puny human telling him what to do, but it seemed he enjoyed the show. The green monster couldn't help but flex while he continued to pump his monster cock. "Puny human, like what you see?" Of course Richard liked what he was seeing but did Bruce really not know who he was? "Banner, it's me, Richard. You know who I am right?" Richard said all the while the green behemoth continued fondling his girthy length, his body growing continuously as more rips and seams formed across his clothes. The growing hulk grunted as he opted to stand, his feet bursting through his shoes as he suddenly increased in height, grunting as his muscles expanded in a rapid burst, his shirt tearing and bursting as his muscles expanded further. "Hu-Hulk can't stop! Hulk want morreeeee." Richard fell backwards, staring up at the growing green giant. He stood at eight feet, clad in nothing but loose torn shorts made from his pants, already on the verge of breaking as they held his filling balls. Veins traveled across his hairy physique, sweat dropping like rain as droplets zig-zagged around the curves and crevices of his muscular body. Hulk radiated with such an immense heat, still pumping his loins as he inched closer to the ceiling. "H-Hulk?" Richard could only question the new name of his partner. The green giant roared and flexed, all but tearing the last vestigial remains of his shorts off. His balls dropped with a pleasant bounce, bringing a blush to the huffing brute's face. "What?!" He barked as the man called out his name, he stepped toward him, his muscles moved in tremendous harmony, like semi trucks maneuvering around a parking lot. Hulk grit his teeth and growled. "What human want from Hulk?" Richard had to constantly crane his head back to keep the approaching Hulk in view. He stood uncomfortably close with his foot and a half prick poking against the scientist's chest, smearing pre into his work shirt. Richard continued to gawk up at Hulk, his heat and odor getting to his sensitive senses. Without saying anything, Richard put both of his hands onto the Hulk's shaft, slowly moving his palms back and forth, the deep green foreskin stretching and pulling back. The Hulk snarled growing impatient moments before the human's hands were upon him, slowly working his shaft. The big green man placed a hand on the wall to steady himself. He licked his lips and moaned gently as his shaft was working. "H-hulk feel good. More! Hulk want more!" Sweat formed on Richard's face as both the heat emanating from the Hulk's body combined with the lingering expectations expressed by his oversized partner. Never before would he have imagined himself in this situation, his lab assistant several times bigger, enraptured by sexual acts conducted from both curiosity and fear. Nevertheless, Richard picked up his pace, pressured by the brute's anticipation. The Hulk groaned and placed his free hand on Richard's head, stroking him gently as the man pleased him. The green giant felt a rise in pressure through out his body, drawing several long growls from him as his muscle inflated further, straining his emerald skin as his grip grew stronger on the human's head. Each stroke served to separate the smaller scientist's hands apart from each other as the shaft pushed up and out. He was growing. The stimulus from each masturbatory act only fueled the beast's power. Ever so slightly did the Hulk's shoulders bulge horizontally, chest furl forward, legs thicken in every direction, feet and hands scaling to larger sizes. His head remained almost untouched with the exception of his jawline growing bulkier, his brow shelving and cheek bones more pronounced. His overall appearance was made manlier. The growing brute felt his power increase, his body take up more room, his figure growing more and more imposing. his shoulders grew further apart, granting more space for his muscles to expand into. His musculature bulged under his skin, as deeply striated and detailed as the support cables for a bridge. He smirked down at the human, as he grew smaller and smaller. He felt his balls slowly drop down, swelling as his seed filled them, almost to bursting. Witnessing the scene of his colleague, brutish and virile, growing right before his eyes had ignited even the doctor to sink deeper into his love-making. Eagerly, Richard pressed his lips against the smelly underbelly of the green cock while his hands pushed towards the back side of the stiff tool, lathering the meat with his tongue. The smells, the taste, the increase in flesh and splendor, all of it left the two intoxicated. The growing brute cried out with each wave of growth that radiated out from his massive shaft. the smaller hands, the warm tongue and the sheer physical pleasure of this transformation was growing to be too much for the Hulk. "Hulk gonna... Need to cum!" Suddenly, Richard noticed the Hulk's involuntarily growth had ceased, replaced instead by a shaking sensation that tackled every foot of the green brute. He stepped away slowly, as if anticipating a bomb ready to go off at any moment. Hulk roared and grabbed his massive cock, working it furious as his felt his balls tighten, muscles deep inside him sprung to action as his hips involuntarily thrusting his shaft into the wall, pounding through the concrete until at last, release was granted, his thick seed shot out in pulses as he let out a guttural roar, flexing with all his might. His growth suddenly returned, his head slamming into the ceiling as his body expanded faster now. cords of muscle growing discordantly. He stared at the hand gripping his manhood, watching as his fingers ballooned one by one, his palm widened to match, knuckles popping and rising like mountains. He hissed and snarled as his other hand, curled into a fist grew to match. Hulk... feel HUGE!" he bellowed. Slowly, the orgasm subsided, the giant green man panted and rubbed his head, and slowly looked himself over, admiring his new mass and size. "Human... make Hulk feel grow again." he growled. Richard stood behind him, jaw dropped as he stared on at the miraculous presentation of the Hulk's fuzzy backside. So many muscles were shifting hypnotically from the simplest of movements. Richard's eyes widened in excitement when he looked below to see such an enormous ass, strong yet plump with curly hairs sprinkled between each cheek. Even below that, the Hulk's mighty testicles hung low between his legs, bigger than ever, reaching just below the knees and hairy, like the rest of his frame. The Hulk slowly turned to Richard, his brow furrowed in annoyance, his eyes deep in his skull now, as his brow had expanded tremendously. As he turned, the other scientist would get a clear view of the perfectly sculpted delts, his triceps and striated lats. His bicep slowly swung into view, as large as a car tire. His pecs followed, each globular mass jutted out from his chest like the peaks of a mountain. Across his body grew the gently curled, black hair. His lantern jaw was dusted with a healthy 5 o'clock shadow. Despite the perfect spectacle of throbbing muscles, sweat and hair, the Hulk's presentable turn brought forth an even bigger cock into view, growing flaccid now but thicker and bigger than before. The width could match even his hulking legs that draped in front of his titanic sack. Just how big could Hulk get? Richard could barely even process such a size. "Human no hear Hulk?" He grumbled stomping forward towards the man, cock swinging from side to side leisurely as he walked forward. "Human!" Shaking in fear, all Richard could mutter was "Y-Yes?" The Hulk started to fill his sight as he approached, a twelve foot muscle bound giant approaching, hunched over with abs of steel flexing and his traps carving indents into the concrete ceiling. The Hulk struggled to move at times, dragging his rising traps through the concrete roof, shaking the dust off his shoulder. "What happened?! How Hulk... grow?" he asked, sounding genuinely curious. "W-well Hulk, you're....hammer right there", Richard raised a finger pointing to the enormous girth between Hulk's legs. "That make's Hulk grow..." "Hammer? Hulk no have hammer. Have fists!" he growled, holding one out for Richard. "See! Better than hammer, stronger." He unfurled his fingers gently, his forearms rippling as the muscle pulled his ligaments in a synchronized dance. "Hulk remember though. Making Hulk feel good made Hulk grow. But Hulk remember... light, green, made Hulk! Get light, Hulk wanna see if it make Hulk Hulkier." "A light?", Richard asked questioningly. Perhaps he meant the machine. Green radiation could be the green light. If one dosage made him this big, what kind of an effect would another do to him? Regardless, Richard was almost giddy picturing the Hulk at a giant's size. After all, it was a discovery, a scientific discovery. He was ready to discover just how big man could be. "Hulk follow me" he said to him and walked out into the next room where the experiment took place. Part 2