Derrick looked around and grinned. Then he looked at the red-haired faun. "You decide! What would be the most fun for you and the other fauns?" That seemed to surprise the gathered goat-boys, but the redhead only had to think a moment before telling Derrick to get on his hands and knees and shut his eyes. The teen expected he was about to get fucked, and was not disappointed. However, human arms did not wrap around his waist - he felt furry forelegs around his ribcage and heard a Billy bleat as it covered him.
The redhead moved in front of him and sat down to watch Derrick's face. "I want to watch become an animal, and then I will make use of your new cunt. Many of us will!" Derrick could see how that would be entertaining for the fauns, but he was already feeling way more interested in the goat anyway. Although it started in his anus, the male pulled out and thrust in again, this time in a Nanny's opening. Derrick gasped as very intense sexual pleasure filled his body with a heat that flowed through his whole being.
The goat got heavier, but also drove in deeper and his scent started to fill Derrick's nostrils. The boy was only part aware of transforming, mating taking a greater precedence. The faun watching him grinned as his muzzle formed, and others laughed as his penis swelled out into a udder. The mating lasted several minutes, Derrick only dimly aware of fur sprouting, his hands and feet closing into cloven hooves. And when the Billy ejaculated into him, Derrick was fully transformed into a Nanny goat.