Bill ran upstairs with the satyr in hot pursuit. He was planning to lure Dan upstairs into his room, but as he rounded the corner tot he stairs, he nearly collided with his 13 year-old brother, Bobby, a scrawny blonde-haired kid who yelped and stumbled back. Another boy about the same age was behind him, and he yelled. "Who the fuck are you!?"
Bobby blinked and stared. "B-Billy?"
Bill grinned and tousled his brother's hair. "What do you think of your big brother now?" He looked at the other boy, whow as staring in awe at Bill's crotch. Both boys had hit puberty recently, and thier hormones were raging. That was all Bill's nymph nature needed, and he grabbed Bobby's friend and pulled him into a passionate kiss.
Bobby was so shocked he didn't even notice Dan until the satyr started towards him. He gaped at the oversized goat's penis and testicles. "Holy crap! You're huge!"
Dan grinned and nodded. "Lucky you, I'm willing to share!" He pulled Bobby into a warm embrace as Bill started removing the other boy's clothes. Both of the younger boys were overwhelmed by the intense sexual needs that Dan and Bill were creating, and in less than a minute both were naked.
Bill pulled his boy to the floor and began a sensual licking of the teen's body, his nymph's nature instructing him in the best ways to pleasure his partner. Dan, on the other hand, was all lust. He grabbed Bobby and spun him around, hefting the boy up so he could thrust his goat shaft up the boy's anus. Bobby cried out, but it was a shout of pleasure that turned into gasps as Dan thrust hard and deep.
Bobby twisted in the saty's embrace, feeling hot passion flow through his body. He was getting larger, and the buds of horns appeared on his forehead. As Dan continued to thrust, the boy matured rapidly, his own small boy cock and balls swelling into goat's equipment even darker and larger than Dan's.
Bill pushed into his boy gently, both of them flushed with passion. There was a throbbing, an awareness of the boy's body and soul that grew as he thrust slowly. Just as Dan was turning his little brother into a mature satyr, Bill felt the need and power to change the boy he was mounting. But his changes were far different - the boy had been nice looking, and would probably have been handsome in a few years. Now his features got coarser, his teeth large and crooked, ears sticking out, and hair getting tangled and shaggy. His cock and balls tripled in size at first, but then shrank a little as the now-ugly boy got younger.
Dan and his fellow Satyr Bobby both came together, Bobby spraying his huge load across the room with a loud bleat. Dan also shuddered in release, but the now 8 year-old boy under him could only piss himself as the nymph finished him up.