Leo seductively wiggled his ass, turning me on even more. Getting down, I stuck my tongue into his anus to loosen him up, causing him to moan even more than he already was.
"F...Fuck!," he yelled, "This feelrrrrr amazing!" I could hear the growl he made, knowing that his transformation was starting. Pulling my tongue out of his ass, I positioned my dick at the entrance to his ass.
"Arrrre you rrrrready?," I asked, slightly growling.
"Yes!," Leo yelled, "Fuck me! Make me yourrr bitch!"
I slowly began to push into his ass, causing him to wince in pain as it happened. I could feel his anal muscles contracting around my member, causing me to moan as they began to milk it.
I began to push more and more of my member into his ass, causing Leo to moan in pleasure. I could see white fur beginning to grow on his body as his muzzle began to form. Knowing that he was getting used to all of it, I began to thrust in faster, and when he screamed in pleasure, I knew I had hit his prostrate, so I continued to ram the head of my canine dick into his G-Spot. I watched as his feet became paws and his nails became claws. His ears became pointy and moved to the top of his head, and his eyes became golden-yellow. A white fluffy tail grow out from his tailbone, and I watched his own member became a red canine member like my own.
I could feel myself getting closer and closer to exploding with every thrust. With one last thrust, I pushed my knot as far as I could into him, knotting the two of us together as I released my load inside of him.
When we finished, we both sat there panting, with me still knotted to him.
"Joey," Leo said, panting, "Thank you."