Aster stumbled into the hidden canyon just as the sun dipped out of sight, leaving him in near darkness. He had no idea what primal forces lurked in this ancient place.
Suddenly a massive shadow detached itself from the cliff wall and approached with heavy footfalls. A minotaur emerged into a shaft of moonlight - a towering figure of rippling muscle and taut leather hide, with the head of a snarling bull atop broad human shoulders.
"Well well, what do we have here?" the minotaur rumbled in a deep baritone. "A tender morsel wandered into my domain."
He circled Aster like a predator stalking prey, until they were face to face with Aster's eyes level with that throbbing bull cock. The minotaur grabbed the human's hair roughly and pulled his head back.
"You will submit to me now, little man," he growled. "I will transform you."
Before Aster could react, the minotaur forced him down onto his hands and knees. He shuddered as that powerful body loomed over him, until a hot tongue dragged up the cleft of his ass and probed at his entrance.
The minotaur lapped and slurped at Aster's hole with ravenous hunger, spearing his long tongue in deep to taste the human's most intimate places. Aster moaned and writhed under this oral assault as the bull-man feasted on him like a starving beast.
"Nnnngh...master!" Aster cried out as that wicked tongue wriggled inside him, stoking unfamiliar fires deep in his core. The minotaur seemed to relish his submission, growling in approval as he ate Aster out with increasing fervor.
Aster's entire body began tingling and burning as the bull-man worked him over. He could feel himself changing from within as that tongue pumped in and out of his ass, flooding him with the minotaur's transformative essence. With a final shuddering moan, Aster came undone - his body shifting and growing as he was remade in his master's image.
When it was over, two proud minotaurs stood at the water's edge under the moonlight, joined in carnal bondage. The newly transformed Aster nuzzled against his bullish mate, eager to explore their wild new life together in this untamed realm.