Derrick looked around at the goat-like creatures around him. They looked like huge humanoid billys, pretty much animals. But he found them really attractive, way more than he had when he started. There must be something in the magic that was changing him that also made him like them more. Did he really want to keep going? He hefted his enormous goat ball sack and then pushed down on his sheath to let the slick goat cock emerge. Oh, yeah!
Round two was already starting, and an even larger, more bestial satyr grabbed him up with a bleat. Derrick twisted around to face him and wrapped his legs around the goat-man's waist, only to get pushed down onto the rigid animal cock. He gasped, and then kissed the satyr on the muzzle. Tongue and spit that tasted of grass and bits of bitterness filled his mouth. He felt tremendously horny now, and dropped his hands to masturbate himself. He could feel his own cock swell out larger, longer, and the throbbing of the satyr's cock seemed to pulse up through his body. Derrick was getting bigger, more muscular, maturing. His face was pushed out into a partial muzzle, and the fine hairs had thickened into coarse fur. He could feel heavy horns curling out from his skull, but the weight felt good.
Derrick grunted, then bleated with his head thrown back as he came with incredible force, jets of yellowish semen shooting up between them. The satyr joined him a half-minute later, filling Derrick with a flood of his own hot seed. They remained locked in the passionate embrace for a minute or two, then sagged to the ground and licked each other clean. Derrick slid his tongue over the satyr's cock, probing into the sheath, and grunted in satisfaction as his throbbing anus was also licked.
When they were done, the satyr took him over to a pool off to the side and pointed at the surface. Derrick looked at his reflection - it took a moment to realize that the creature staring back was him! He was huge, well-muscled and mostly transformed. His eyes were still human, instead of the yellow-gold goat eyes of the satyrs, and his muzzle was still not fully formed. As he stared at himself, yet another of the largest satyrs moved behind him, and Derrick felt the hard prod once just before he was mounted once more. He was aware that most of the other satyrs had gathered around the pool to watch, but his eyes were focused on his own grunting, bleating reflection. As the huge male thrust in, Derrick's head finished the transition to goat and he filled out to be a match for any of the biggest satyrs there. He was fully mature now, an adult satyr. How would that affect his human form when he returned? He was probably the equivalent of a young man in his mid-twenties, a good decade older. That could be a problem in tenth grade. If he ever chose to go back! His parents would not recognize him - even as he thought that his eyes changed, vision shifted slightly, and Derrick was fully transformed. The satyr reflected back at him was a powerful creature with no trace of the young human he had been. Derrick felt a surge of lust and turned back to his new brothers, then threw himself into a sexual free-for-all that lasted until the sun started to set.