Your cock starts to grow, exploding out of your pants with a large rip. It's not only thicker and longer, but you can see is starting to turn darker in color, gaining a distinctive ring around the middle, and its head flaring out and flattening. Your once average human dick is turning into a proper bull's cock, perfect for breeding cows. The sight of your cock transforming and growing, as well as the feeling of it, the sensation of someone pulling on it, causes it to throb and begin leaking pre, a few drops running down the increasing length of your cock. It becomes girthier as well, becoming as thick as a beer can, and it keeps growing in length, reaching an impressive 16 inches. It finally turns black, the skin becoming slightly leathery as the transformation finishes, leaving you with a properly huge, erect flared bullcock. You begin to stroke it; your puny human hand barely reaches around it. It feels unreal as you masturbate, more pre streaming out, acting as a makeshift lube. As you do, there's more pressure elsewhere in your body, a heat going along with it. You look to your...