As Mary watched in disbelief, Buster's body contorted and twisted, the dog-like features she'd always known slowly giving way to something entirely new. His fur began to recede, revealing smooth, tanned skin that stretched taugh over his growing frame. His snout shrinking and narrowing into a more human nose, while his teeth shifted and realigned, losing their sharpness in favor of a perfect, white smile.
Buster's ears shrunk and reshaped, rounding into human-like lobes as his head grew proportionally larger. His muscles bulged and restructured, transforming from those of a powerful dog to those of an athlete - toned, defined, and strong. His legs lengthened and thickened, the pads on his paws shrinking until they became human feet, complete with toenails and arches.
His tail, once wagging eagerly, vanished without a trace as his rear formed i to a human butt. As Buster's hindquarter shifted his entire stance changes so that he now stands on two legs.
Mary gasped, tears welling up in her eyes as she saw her beloved pet undergoing this incredible transformation. She couldn't help but feel a mixture of surprise and curiosity, wondering if this change would rob Buster of the loveable spirit that had captured her heart.
But as Buster's transformation neared its end, his facial features softened, taking on a gentle expression that still held remnants of his loyal nature. His brown puppy-dog eyes now sparkled with intelligence and understanding, and when he opened his mouth to speak, his voice was deep and rich, yet retained a hint of the familiar bark she knew so well.
But all the time while Busters whole body shifts and changes, his canine member seems to be unimpressed by these events. However a hint of arousal is clearly visible indicating that the transformation is more pleasant than painful for Buster.
"Buster...you're...you're a man now," Mary stammered, ogling his naked body. Reaching out to touch his arm she half expected her hand to pass through him like a ghost. But her fingers met warm flesh, solid and real.
Buster smiled, placing a comforting hand on her shoulder. "Mary, don't be afraid. I'm still me, your Buster. Just a bit... changed."
He glanced down at his newly formed anatomy, looking both amazed and slightly embarrassed. "I guess I need some clothes," he chuckled, his voice filled with a newfound confidence.