Simon watched his brother and his dog go at it, and it gave him an idea. He turned back to his computor and went to work, making sure that he was only changing Chris.
After a few minutes he set the time frame and hit enter. He looked over at his brother and smiled, seing that Chris was havign a very good time with sparky. "The best is yet to come bro."
After a few seconds, the computor chimed the start of the process, and Chris went stiff as he felt them begin. The changes started with his limbs changing back into human, except for his lower legs, they remained doglike but grew to human proportions. His muzzle retreated but left some rather large teeth, Simon had made them softer so if he bit anyone it wouldn't hurt as much. His ears returned to normal but were a bit pointed still. The fur on his body was drawn in except for a stripe on his back. The long golden fur went all down his back to his tail, which did not shrink in any way. It wagged underneath Sparky gently as the dog pouned into his former owners ass.
Simon reached underneath Chris to feel his cock and balls, which were canine in everyway. The computor chimed that it was finished and Chris looked at his brother and smiled, showing his canines as his body rocked with the dogs thrusts.
Simon wated for Sparky to be done, then he moved over to his digigrade brother, who jumped up and shoved his dog cock into Simon. They stayed like that for a while, before Chris deflated and pulled out, panting. He stood up and looked at himself in the mirror, he did like it, but he wondered what had caused it.