Riven barely recognized the world around him as he struggled to gain control over his body. He staggered forward, knocking over a chair in the small apartment. His broad, powerful chest rose and fell with each ragged breath. Sweat beaded across his now-smooth, thick skin, and the very air felt heavy—thick with something dark and unnatural. His pulse was a hammer, each beat sending a jolt of raw power through his swelling limbs. Every motion felt too large, too strong for his old, human self.
The once familiar weight of his body had turned into something unbearable. A force. A beast. His chest burned as muscles swelled with each breath. It was as though his very soul was struggling to escape his humanity, to let loose the savage thing that was rising within him.
Riven clutched the edge of the sink, staring at his reflection again, though he could hardly make out the details of his own face. His eyes had turned a fiery, unnatural yellow, the pupils now slits. His once normal jawline was now a grotesque amalgamation of jagged edges and deep ridges, like something carved from stone. His nose had elongated, his nostrils flaring wider than they ever should have. And his teeth... they were sharp, long, like the fangs of a predator, a grotesque reminder of what he was becoming.
"No," he whispered hoarsely. "This can’t be happening." His voice, once smooth and even, was now a deep, guttural growl.
He tried to step away from the mirror, to flee from the monster he saw in its reflection, but his legs were too thick, too heavy, like tree trunks beneath him. His knees ached with each movement, the bones grinding against one another as they reshaped. The skin along his spine stretched taut as his back arched, his shoulders broadening like a bull preparing to charge.
His body was not just becoming bigger—it was becoming alien to him, foreign in every sense of the word. The overwhelming urge to give in—let go of the fight—grew stronger. He clenched his fists, his massive hands trembling with rage, but it only caused the change to escalate.
A deep, primal growl bubbled up from his chest, and Riven slammed his fist into the wall beside him. The impact sent cracks spidering through the plaster, a testament to the strength now coursing through his every vein. His fingers—thick and muscular—snapped the drywall like paper. Each action he took only seemed to feed the monster growing inside him, urging him to give in, to surrender to the surge of virility and power that coursed through his very blood.
“No... I... won’t…” he gasped, but even as the words left his mouth, his skin quivered. The very essence of him, his bodily fluids, began to shift. There was something... wrong, something horrifying inside him. His blood was no longer just blood. It was thickening, changing into a dark, viscous substance, full of mutagenic energy. He could feel it pulse through his veins, hot and insistent, like an infection that wouldn’t be denied.
His body had gone beyond simple muscle growth. It was adapting, evolving into something that could spread, something that could infect others. The fluid inside him was no longer just for sustaining his form—it was a tool of transformation. His sweat, his saliva, even his semen—all of it was now charged with this mutagenic essence, a liquid power that would turn anyone who came into contact with it into something like him. Something monstrous.
Riven’s stomach churned at the thought. He tried to push the feeling away, tried to force the thought back into the recesses of his mind, but the deeper he fought, the harder it became to suppress the beast inside.
His hands, now clawed and brutal, reached toward his chest. He could feel the thickening of his muscles, the transformation of his very essence into a creature of raw power. His chest exploded outward, and with the shift, his clothes shredded under the strain. The seams of his pants popped, unable to withstand the sheer force of his transformation. His thighs swelled, his calves bulged with each passing second, and the very sound of his bones shifting sent a sickening crack through the air. His skin was now covered in a thick layer of coarse hair, and his horns, which had begun as small nubs, spiraled outward, growing longer, sharper, until they jutted from his skull like twin weapons.
He could feel it happening—everything inside him shifting, changing. The mutagen coursed through his veins like fire. He could taste it on the tip of his tongue, a bitter, metallic tang that coated his mouth. His fingers brushed the blood on his lips, and in an instant, he felt the flood of power rise again, like an electric shock coursing through his body.
The thought of what he was becoming... it filled him with dread. Yet, at the same time, he couldn’t deny the pull of the strength. The sheer virility of his transformation made him feel invincible, unstoppable. His thoughts scrambled, his body fighting against the pull of this transformation, but his mind... it was slipping.
His heart pounded harder. It felt like it was about to burst from his chest, like it was the source of the changes. It was impossible to deny the pull anymore, the overwhelming desire to give in and let the power flood through him completely. He tried to fight it—tried to stop himself from losing everything he had once been—but the beast inside was too strong, too raw.
His body lurched forward, his muscles growing at a terrifying rate. He could feel his spine stretching, the thickening of his neck as it swelled with newfound muscle. His head hung heavy, his body now towering over the remnants of the man he had once been. His cock, too, was swollen with the same potent, mutagenic force, an aching pillar of virility that seemed to echo the power surging through him.
And when he came—when the floodgates of his new power opened—it was not just a release of pleasure. It was a violent eruption of virility. His semen, thick and dark, pulsed with the same mutagenic essence that had overtaken his body. It sprayed across the room, dripping down the walls, leaving behind traces of the power that would soon be unleashed on anyone who came into contact with it.
The change was complete. The monster that had slowly taken over him now stood fully formed—half man, half beast, with power radiating from every inch of his mutated body. Riven’s mind was no longer his own. It was consumed by the instincts of the creature he had become. And in the quiet aftermath of his transformation, he understood what was happening now.
He had become a vector. A vessel of change. A walking virus that would spread this mutation wherever he went.
And there was no going back.