"...you should mount Daisy and make some pups."
"What?!" Yelled Sonya, but it was too late. She let out a gasp as the changes began.
"C'mon babe, but we need the money. We can get a good price for purebred German shepherd. Be my stud dog for a bit."
Derek heard Sonya's bones crack. Her feet began stretching. A tail pushed out from her ass as a small nub formed the front of her underwear. Soon, a very male, very canine member ripped off her underwear altogether. Derek watch her ears move up her head, reshaping into dog ears.
"Pwreeeese turrrrrrn me back!" pleaded Sonya as her face pushed out. Derek and Sonya both winced as her skull shrank with an audible CRACK.
Sonya felt her mind slipping away. As her head changed into that of a German shepherd, almost all humanity was gone. Sonya felt her body move over to Daisy. Daisy presented herself, and Sonya mounted. The two of them mated, every pound seemed to speed up the changes. fur grew in, eyes turned brown, legs reshaped and finally Sonya's chest pushed out. Her bra snapped off. The last piece of clothing came off, and the last shred of humanity was gone.
Derek got down and stroked the stud dog's fur.
"You in there babe?"
Sonya continued pounding.
"Babe?"
Derek noticed another collar below the transformation collar. It read: Jack Hammer
Derek was slightly surprised, but not too much.
"Good boy Jack."
Jack wagged his tail happily as he waited for his knot to shrink.