Matt shuddered in ecstasy as he fondled his new, massive equine prick. It was easily as thick as a beer can and stretched as far as his chin. Clear, musky precum leaked out of his pisshole like a persistent, leaky faucet. His face flushed, his hands sweaty, and his cock still throbbing with need.
Meanwhile, Tom looked on with interest. Just the sight of his roommate changing and acting so lewdly got his huge stallion dick growing again, snaking out of its sheath and erecting to full mast. He was almost done transforming, his body reaching male equine sizes and his face being the only thing left to change. Slowly, his eyes began to move apart and his nostrils flared wider. And he smelled the need coming from Matt, and the hot musk.
"Oh... oh...! So good...!" Matt moaned, his cock being the only thing that changed at the moment, though his pants were feeling a little tighter than usual in the backside. The front zipper and button have already torn open by this point, unable to contain the massive pillar of man meat the young man now sported. What was once a measly five inches was now over two feet long!
Matt's eyes widened as he felt the floodgates finally open. His prostate throbbed and pulsed, his balls churning with hot white horse seed, and what was left of his human seed, and his dick quivering back and forth.
"Aaah... AAAH.... AAAAAAAAHHHHHHNNNNNEEEIIGH!" Matt yelled at the top of his lungs, shooting his load all in front of him, landing on the walls, the furniture, himself, and Tom. He felt light headed, as this was the most pleasurable orgasm he ever had in his life.
Then...