The young man looked in amazement as another nanny stepped up for her turn with his new equipment. The nanny turned her back him and lifted her tail, instructing him to mount her. Looking at the nanny's ass made his flaccid cock stiff again, only this time, it seemed a bit longer, and his balls seemed larger (?). As he saw his dick grow to giant proportions by human standards, he saw his hairless satyr's dick and sack grow white coarse hair. Even though he was slightly frightened of the changes and what they would do to him, the pleasure and animal instinct became too great as he thrust blindly into the nanny's ass as she bleated. First the young man screwed her in her moist goathole and then turned his attention to her asshole, and thrust in and out of the nanny with all of his strength.
As the waves of pleasure washed over him he noticed the changes come softly and swiftly. His hands, which he was using to grip onto the nanny's ass became like cloven hooves. As he threw his head back in pleasure, he felt two large horns grow out of his forehead, and goats ears replacing his human ones. He felt the changes and although he wanted to stop them, he could not fight the primal urge to mate with the willing she-goat. He felt a sharp pain just above his ass as he turned to see a hairless goat's tail sprout, only to be covered with white goat fur moments later. The young man felt himself bleat in sync with the nanny as he pumped out, then thrust in as hard as he could, and then came. The young man fell back onto his ass, now a fully-transformed satyr.