With the amulet held out in front of him, Nathan took a deep breath and said, "I wish to have the form of a well-endowed giant donkey. I want to be three times as big as I was before." Nathan grinned evilly down at Mitch as the amulet glowed and began to transform Nathan.
Mitch watched in horror as the naked Nathan began to swell and grow. Each passing second had Nathan growing inch by inch. As he grew, he also transformed. Nathan's ears lengthen and widened. As did his face, it grew outward into a muzzle and Nathan's neck swelled to match the width of his head. A long tail spurted out behind him and swished back and forth.
Nathan had grown to nearly eight feet. He was thick and massive. Soft brown fur emerged all over him, covering his nakedness. Nathan watched gleefully as he transformed. Nathan's manhood swelled with his body, becoming even larger than before. It grew into a sheath and rested against his body. Soon, his hands were merging, he looked down in alarm. The amulet didn't have the chain anymore, he couldn't wear it. And he couldn't let Mitch get it. He did the only thing he could. He popped it into his massive mouth and easily swallowed it down. He smiled as best he could at Mitch with his thick rubbery lips and licked them with a weighty tongue.
A barrel chest inflated outward and forced Nathan onto all fours and he hit the ground with nearly fully developed hooves. Mitch had shrunk back to the far wall. He was at the same time fearing the suddenly giant donkey transforming before him, and enjoying it. He was repelled because he knew Nathan wanted revenge, but he also found Nathan's donkey body attractive. He both wanted to run away from Nathan, and also to stroke the luxurious fur.
The transformation was soon completed. Nathan had retained his mind as he only wanted the shape of a giant donkey. His lust for revenge still gleamed in his eyes. After a second of enjoying the form of a donkey again, Nathan turned his eyes to Mitch.
Something about being glared at by a giant donkey struck Mitch as rather odd. But, before he could do anything...