Sage looked back to see Justin on the ground, a blubbery version of his former self, and her horse cock began to emerge from the sheath. As her new cock became 24in fully erect, she fell over from the new weight. A loud snap echoed through the barn as her legs began to shift into a new more equine shape. Her fur began to spread down her new legs, becoming white halfway down and very fluffy at the bottom. She tried to stand back up but as soon as she did, her toes began to swell, darken, and fuse into some impressively large hooves. Justin looked up to see the changes and shouted to her "Hey, looks like you're becoming a Clydesdale! I hope you're ready to get absolutely massive." He gulped in fear as he knew he was getting absolutely massive himself, now a naked 400lb.
Sage began to mutter to herself as her vocal chords thickened and her tits slowly disappeared. She -or rather now he- stopped quickly though as his ass began to grow and his legs lengthened and thickened up to match. He now had the huge back end of a Clydesdale, dick and all. He thought it had stopped and sighed in relief, but after a few minutes the fur began to spread again, now reaching his upper chest. He looked in horror as his stomach began to inflate and his ribcage barreled out to reveal his new equine torso.
The fur spread once again and he whimpered and groaned as his arms began to shift and lengthen; his hands darkening, swelling, and fusing. His horse cock began to wildly slap against his new stomach, SLAP... SLAP... SLAP. This went on for several minutes before he finally came all over the wall and his cock retreated. As he took some much needed deep breaths, his neck began to elongate and thicken. His nose flattened and his nostrils flared out as his face began to morph. His ears moved to the top of his head and became horse ears, his fur grew upwards and stopped right as it hit his pink nose. His pupils squared out and his eyes became a gorgeous shade of amber. Finally, his cock and balls grew again once more, reaching 30 inches with balls almost the size of basketballs. Sage was now a full on Clydesdale standing at 20 hands tall.