Tina's frail body went ridged as Diane continued to thrust into her in mad passion. Diane's former mind had completely faded and only instinct drove her now.
As Diane continued, small changes began to become evident on Tina's body. First her body began to elongate and she took on a less childlike body type. Her hips flared out and her breasts began to inflate, giving her a nice hour glass figure.
Tina tried to open her mouth to scream again but only a weak canine wine escaped her mouth. A long thin tung flopped out of her mouth as sharp teeth began to fill her mouth.
Desperately trying to escape, Tina tried to crawl away but Diane's paws held fast, keeping Tina in position.
Diane suddenly began to pump faster and Tina's changes picked up speed. Her ears began a slow decent up her head as golden fur started sprouting all over her body.
Tina's ears flopped over as they reached the top of her head a golden patch of fur already covering them. Tina's body shuttered as it began to lose it's feminine shape and became more dog like.
A tail sprouted from her ass and her nose shot out of her face. A snout forming to match her fur covered head.
Diane's body shook as she blew her load into Tina and withdrew.
Tina's body shivered as the last patches of fur covered her body and she took the look of a golden retriever.
Then there was a sudden knock at Tina's door.
"Tina," Diane's mother yelled, "Is Diane in there with you?"