Tyler started massaging his cock, but as he watching himself jacking off something felt wrong. It felt like he was playing with his old six inch shaft.
"Maybe I need some more of the equinum." Tyler said to himself. He reached over and drank a third vial. The effect was almost instantaneous. His body surged again, and his cock thickened. It was as thick as his forearm. He saw more pre dribble out of his hole.
Below, his meager ballsack started to swell. His nuts doubled in size, until they were about the size of apples. His scrotum grew a fine pelt of dark brown fuzz. Tyler then felt a rush of adrenaline and testosterone, as his balls began fueling his cock.
His pumps became faster and more erratic. He felt his balls pull up, and something churning inside them. His shaft twitched as cum rushed through his urethra and it blasted out of his horsecock. Thick globs of the stuff flew everywhere, leaving a huge mess. Tyler took deep breaths once he finished ejaculating his enormous load, and looked at himself. With his adult body, horsecock and balls, he was pretty satisfied. But he wanted more.