As big as his equine cock was, Derrick didn't think any of the animals here would be able to take him. A ewe ambled over to sniff curiously at him, bleating and then licking his hard shaft. The touch of her tongue triggered a sudden release that forced Derrick to arch back, his load spewing in a jet that was probably even more than the predicted 6 feet. However, when he finally regained his senses, he discovered his penis had shrunk dramatically to a hard, thin pink shaft encased in a sheath.
The Satyr grinned. "I think that ewe want you. Or you want ewe. Works both ways!"
Derrick stumbled forward and almost fell over the back of the sheep. He needed to fuck something, and this ewe was willing and now a perfect fit. It took a few tries, but he managed to find her opening and thrust in. He had never had sex before outside of masturbation, and the intimate contact was overwhelming. He hunched over the animal, the awkward position of a half-kneel forcing him to put most of his weight on the female's back. Then it didn't matter, as the need to drive deep and hard filled his mind.
The Satyr had been right about wanting another. Derrick was still gasping from the brief but powerful encounter when a second ewe made advances. It was easier this time, his cock and testicles now fully those of a ram, and though he wasn't really aware of it, his body was altering with each massive ejaculation. The Satyr slipped a hand under Derrick's swollen testicles, stroking the black equine ballsack as it got even larger and longer and sprouted white, curly fur.
A normal ram can service five ewes a day, but with the Satyr's magical enhancement, Derrick covered three times that many before he finally came to his senses. He was standing amidst a group of ewes, feeling physically and emotionally drained, but also totally fulfilled. He couldn't imagine being more satisfied, or ever accomplishing anything more important. That thought was curious - why did mounting sheep seem like the whole purpose of his life?
It was only then that Derrick realized he was on all fours. All four hooves. Twisting around, he saw a rounded body covered with dense, curly, gray-white fur. A mature ram's body. He tried to call for the satyr, but all that emerged from his muzzle was a bleat. A voice from behind made him turn around to see his 'friend.'
"Told you so!" The Satyr grinned, squatting down to look in his eyes. "I helped a little, but I never saw anyone take to being a stud so quick or so completely. Fifteen ewes in four hours! That's got to be some sort of record. Just be careful. Get into the role too much and that pesky human stuff like intelligence and memory will fade away. You'll be fucking a ewe and slip from being a transformed human into being a real ram without even being aware your very soul has been changed!"
His soul!? Derrick bleated in alarm, which made the Satyr chuckle again. "Don't worry about it. Plenty of time and plenty of ewes. Anyway, this is your flock for the next two weeks. At least." The goat-man stood and started to walk away. Derrick tried to follow, but a ewe blocked his way. Her scent made him hard, and he struggled against sudden and powerful urges. He almost had them under control when he realized the Satyr was already gone. And then so was his willpower. Derrick's worries vanished in the haze of instinct and need as he mated with number sixteen.