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Khan swallowed hard.

We'll pull back a moment to give that some context. Surrounded by an observation deck that was a "safe" hundred meters from him and standing among scattered gym equipment that seemed appropriate for testing the maximum loads for mining equipment, a tyrannosaur whose steps shook the earth - a mountain of grey-green, reptilian power - swallowed a brand-new class of experimental supplement whole.

He squeezed amber-yellow eyes shut with effort and pleasure as he felt the payload drop down into his gut with significant weight. That gut barely expanded to accommodate it despite the "pill's" six-foot length. Instead, muscle as thick as concrete seawalls simply crunched tightly in welcome.

Khan then held up a simple, black, plastic controller four violet LED buttons: on, off, up, and down. With a delicate claw bigger than a traffic cone, he pressed "on". From inside him, there came a low crooning. A smile that could split oaks in two broke out over Khan's face. Much less carefully, he began tapping the "up" button.

Inside, an Acanthopholis ankylosaur squirmed in utter delight. Far from feeling suffocated, the "supplement" - whose name was Santo - instead happily panted in the hot, damp confines of Khan's belly. He pressed his paws out against the internal stomach lining, just needing to move, to writhe as underneath his thick tail, a custom-built prostate massager buzzed in response to Khan's controller. The "little" dino was, like his host, quite round in build, with a spherical tummy (that had felt completely divine as it bulged in Khan's throat, by the by) and short, blunt knobs running in pairs from the top of his neck to the tip of his tail, as well as two flaring out from behind his shoulders. An astute or particularly horny observer might note that the small ankylosaur himself might be a potent prostate masseur, with those soft ridges, but for now, he had instead been a pleasant textural snack on the way down.

As those vibrations intensified, Santo's cock rapidly emerged from the slit out from which it had merely been peaking before. As it thickened and hardened, ridges firmed up along its dorsal surface. The whole thing was built like the rest of him - broad, dense, and rounded. The vibrations switched to a pulsing sensation that had him whining and quickly starting to thrust up against the inner walls of his new housing.

Without, Khan panted in his own pleasure to feel Santo starting to hump inside his belly. He swung his grin around at those observing. This had been his and Santo's own idea and, well, at the promise of what it would do, despite its wonderful perversion, it had been greeted with excitement. Khan's pleasure grew as his occupant's grew. In a short time, his massive slit was pulling back to reveal a cock like a battering ram. Widening from tip to base, it flopped out with massive, slick weight and began throbbing to its true enormity. The seconds passed by with ponderous anticipation while Khan continued to tease Santo through the remote control. He could feel his supplement twitch in response to every level of intensity. Tilting his head, he could even see the little bulge in his belly thrusting harder, and harder, against the inside of his abdominal wall. The movements grew longer, and jerkier, and shakier, as each aching moment passed, and then...!

Santo's climax wasn't like a normal climax. Well before the height of his pleasure, the rotund dino's cock began to spurt its thick batter. He lowed with bliss. The vibrations against his prostate felt like they pushed the climax out of him in bursts while still amplifying his ecstasy. His bright, violet eyes rolled up in his head as the vibrations became harder. He wiggled his hips to push the massager just that little bit deeper, tighter up against him, hips still thrusting with each new burst of seed.

Soon, the cum was pooling around his toes in the little chamber. He felt the muscular walls tighten around him from something Khan was doing. A little squeal of pleasure came out at that compression. He thrust against his own output, and worked his hips and butt against the vibrator, and his body rolled in ecstasy, and he writhed and play-struggled, and the massager suddenly slammed up to its highest gear and the real climax erupted through him.

Suddenly, what had already been an unreal volume of output amplified to a waterfall, no, a geyser, spumes of gyzym firing out of the ankylosaur to flow down the walls and start filling the chamber around him. The heat, the pressure, the pleasure only built as his orgasmic spasms thrashed heedlessly against the powerful muscles that kept him contained.

Khan watched in exhilarated awe as he witnessed the impossible: his belly first faintly bulged, then swelled with dino cum. Far more than could possibly have been stored in that little body pumped out of him and into Khan's abdomen. He grinned and panted heavily while his cock twitched with pleasure. The sounds and squirms inside him were divine. All he needed to do now...

The tyrannosaur set his stance with both feet, gave his biceps test-flexes, and closed his eyes. Then, all at once, he flexed every muscle in his body. Thousands on thousands of pounds of pressure slammed down on the entrapped Santo and the pond of cum he'd summoned. Khan's phenomenal body absorbed it all at once. It took all that essence, all that vitality, all that power, and sucked it into Khan's already titanic muscles, contracting like the air before a detonation.

Concrete cracked like close peals of thunder. Buildings shuddered. Foundations trembled. And Khan grew.

And Santo squealed. This was exactly what he had wanted. Those thousands of pounds clamped down on the ankylosaur and his tank-like body not only withstood, but welcomed them. He practically giggled within the throes of climax as the vibrator was shoved another inch deeper and another blast of pleasure thrummed through him, making the textures on his body grind deliciously within Khan.

He felt the chamber expand around him as Khan grew. He nosed at the walls encouragingly, unable to do much but keep cumming and will his host to grow bigger, and stronger, and bigger, and stronger. And then, he felt the other thing he'd been waiting for: the rhythmic, slamming clenches of the bigger dino's climax.

Khan's first casualty was a stack of weight plates that the mass and velocity of his tail fused into slag. His cock, easily outsizing a tanker, spasmed so hard it forced him to brace backwards and dig furrows in the concrete floor. Notably, those furrows thickened the further they went as Khan's thighs doubled in girth. His recently rounded belly burgeoned to become another bulwark of packed muscle. Biceps flared in the explosion of growth, shoulders fled from center as lats stretched like wings and roiled beneath dense, armored scales. And the whole while, Khan came in gouts that first cracked an observation deck, had the decency to briefly abate so that it could be evacuated before crumbling it, spiderwebbed the wall beneath it with fissures that deepened, and deepened, and gave way to the hydraulic blast of dinosaur gyzym.

When finally the growth and climax stopped, an impossible colossus of saurian girth stood in a small crater with an abutting pond of his own making. He daintily found the controller he had dropped and clicked the off button. He felt Santo slump with exhaustion inside his belly and put a taloned hand on it to rub in appreciation. The littler dino nuzzled back, though it could scarcely be felt through that fortress of muscle. Khan surveyed the results of their little experiment with radiant pride.

Well, one trial alone surely wasn't enough to say anything conclusive...