Ty thought about relieving his enormous new horse member of its equally substantial horse sized load. The mere thought caused pre to pour from his flattened tip and his dick to pulsate even stronger in need.
"Easy, big fella..." Ty whispered, warm sweat pouring from his body. He stood up, slowly, cradling his cock in one hand, and scooped up his massive balls as he waddled to the mirror, his huge furry coconut sized nuts sloshing and hanging down almost painfully low from their sheer weight, still filled to the brim with jizz that was begging to be expelled.
Ty looked once more at his sexy aged up body with an absurd horse cock and balls tacked on and he knew what he needed to do.
"Half horse." He said simply, willing it, as he stared at his buff hairy reflection.
Almost immediately, Ty was assaulted by an intense pulling sensation over his entire body. He staggered to the bathroom wall to steady himself, cock smacking the counter in front of him, and threw his head back lost in powerful throbbing sensations. Gasping for breath, sweating harder all over, it took a few moments before Ty could open his eyes, and when he did he felt exhaustion.
Panting desperately, he looked to the mirror and his eyes widened in disbelief. His muscles had grown even bigger across his entire form, his body firmer and harder than before. Not only that, but his body hair had thickened considerably. He now looked positively furry! Turning his head, Ty noticed the tips of his ears had elongated to a point, and he opened his mouth to find larger and flatter teeth.
His cock jumped at the sight of his reflection, but he had little time to savor it as another intense pulsation began. "Ohhhhh shittt!" Ty grunted, feeling like his cock and balls might explode from their pressure, as he clenched his fists tight, closed his eyes, and felt his hair thickening all over. His feet were throbbing intensely, his ears were stretching, and he felt something poking out above his ass.
Gasping, cock throbbing madly as blood pumped through him, Ty opened his eyes and his jaw dropped. He was almost entirely covered from head to toe in thick black horse hair, his muscles had grown even tighter and more defined under his thickened skin, his toes were huge and misshapen masses beggining to merge together, and he was taller by almost half a foot! He only had a moment to gape at his developing horseness, turning to see the nub of a tail hanging over his hard ass cheeks, before the next wave slammed into him.
Ty's entire body ached in lust and pain at the same time. He could feel his weight increasing with more muscle, his flesh hardening further and further, and absently he felt himself sliding up the wall as he grew taller and taller. He threw his head up, put heavier and thicker fingers on his cock, and found it seemed a lot smaller than before. Or... no, he was growing to match the size of his horse dick! The mere thought made him pant with arousal, picturing himself growing into a huge and handsome equine, he drizzled pre freely now, his control increasing as he grew in size.
When he opened his eyes again, his feet were completely solid horse hooves, covered by thick black fetlocks, and his legs were beggining to twist to an inhuman digitgrade stance under thickened powerful thighs. He rubbed his thicker hands over his lush coat of black fur, jerked his still massive cock with joy, teasing himself, and paused for a moment as he realized a tail was swaying behind him. For a second, Ty looked in the mirror and didn't see his face anymore. It was him, but his nose had grown and pressed out along with his lips and mouth. He had a snout!
The final push began and Ty moaned in delight. He gasped, closed his eyes tight, and grunted. He felt one more intense wave of pleasure, felt his muscles growing even further, hardening him and tightening him to incredible strength, skin stretching taut over his new iron beneath, and he opened his eyes in shock as the top of his new equine head bumped the ceiling! Still he grew further, and to his disbelief Ty had to hunch down slightly so his thick muscled neck was pressed into the roof! He was giant!
As the last incredible pulsation of growth and transformation began to subside, Ty's massive horse cock had left a veritable puddle of precum on the floor beneath him. He looked around slowly, marveling at his massive new size, and flexed his huge arms. He blinked as he saw clearly for the first time how massively strong he was, filled out evenly to a world class bodybuilder, thickened with powerful horse muscles.
He stroked his solid six pack beneath his fur and looked down past his long new face to his cock, which was practically leaking with anticipation now, so flared and tight veins were popping out along its length and tip.
"Oh..." Ty blinked, crouching down to look at himself in the mirror, his voice deep and bestial. "Oh my God." He stared at the jet black furred horse god in front of him and grinned toothily, letting out an inhuman whinny of satisfaction.
"Oh man..." He stared down at his huge still, still half the length of his arm at his size, and gave it a few quick knee weakening jerks. "I need to get this bad boy off!"