"I think the question is who my little bitch is?" Michael half growled, the markings of a Rotty growing out of his skin as soft fur.
Isaac pulled out quickly and stumbled backward, caught in the pants around his ankles. Michael stepped out of his shoes and moved toward the prone Isaac. Yelped, flipped over exposing his ass to Michael, and tried to crawl away. Within seconds Michael was in mounting position. His muzzle was pushing out and his dog-man cock was pushing into Isaac.
Isaac cried out in pain, but it was too late, Michael had him in a bear hug and was beginning to hump his buddy's ass. Isaac cried out, "OH MAN IT HURTS!"
Michael growled in his ear, "Didn't seem to matter too much when I said that, did it? Trust me, Isaac, it gets better. After the pain, there's this wonderful warmth in your guts that spreads to your balls and will make you as horny as I am. You and I can satisfy and take care of each other."
Isaac whimpered, "What the Hell is happening to you, man?"
"I don't know, but you know what, I liked having you in my ass. Now, tell me you like having me in your ass." Michael teased.
"Fuck you, man!" Isaac spat.
"No I'm fucking YOU!" Michael grow-chuckled.
Michael’s knot expanded in Isaac's ass, introducing him to a whole new world of pain. He howled out his pain and Bix in the next room had to know what was going on.
Bix finally managed to open the door; he went running down the hall to his man. Michael was his man and had been since he was a puppy. The dog saw the scene and immediately recognized it as an Alpha dominating his beta.
Michael saw Bix and had an idea. Bix, lick Isaac's cock. Lie on your back underneath him and lick and suck his cock.
Bix, every ready to please his man, did as he was told.
Isaac began to moan as Michael began to shoot out all of the human semen he had left. He continued to hump Isaac as new dog-man sperm built up in his balls and was being prepared to be shot into Isaac.
"Go on, suck Bix off!" Michael growled. "Doesn't his big doggy cock look good?"
Isaac shouted out, "No" but his body said yes. His mouth was drooling, looking at the oozing half-human, half-dog cock.
Bix was sucking Isaac and Isaac's balls were being rubbed by Michael's low hanging, fur covered nuts. Isaac gave in and began to suck and lick Bix.
Soon, Isaac shot a huge load into Bix and this sent Michael into orgasmic spasms. He shot load after heavy load into Isaac and Isaac moaned in pleasure. Bix then shot into Isaac's throat and mouth.
The three sort of collapsed. Michael was a completely transformed Rottweiler Dog-man, lying with his engorged knot still in Isaac's ass. He was gently licking Isaac's neck and rubbing his belly with clawed hands.
Isaac was beginning to feel itchy. The warmth from Michael's sperm was beginning to spread to his extremities, his cock was becoming stiff again and his balls began to tingle with a growing need to fuck.
Isaac's beard was growing in at an accelerated rate; it was coming dark and thick. He felt the prickle of his new beard growing with his hands and he knew by the time Michael withdrew from his ass, he'd be a Dog-man too and one of Michael’s pack mates, just like Bix.