Mike watched as her ass shook, so large and feminine. It took her a moment before she noticed hairs were growing out from between the cheeks, spreading further. At first, she thought something was off, before she remembered what Drake said. "I'm becoming a dog..." The fur kept moving until it covered her ass and the lower part of her spine.
In that instance, she felt a strange twisting sensation at the base of her spine. As she looked, she watched and gasped as her tailbone unfused and curled outward, giving the appearance of a small tail. Then it started to stretch, feeling like her spine was being pulled upon, causing her to grimace a bit from the discomfort.
It grew and stretched, fur moving along with it, until it was nearly as long as an arm. Before she could react, it began to move, and she could feel the sensations of this strange new appendage on her body, moving about like it had a mind of it's own.
With all her focus on her large ass and the tail, she failed to notice her waistline had compressed and hips had pulled apart, giving her an hourglass figure and child bearing hips.