Though you may have started staring in horror, slowly a grin crosses your features. Many men wished to be hung like this, and you have gained it in only a few moments!
"With a cock like this... I could cum for an hour! Wait... if what I said came true before..." A hand comes up to rub at your chin, even as those hefty balls swell slightly, pumping your already impressive sexual parts into a more aroused state. As your cock fills up, your head begins to swim.
"Mmmmm yeah.... I have a great big race horse cock.. prime fertile stud material. My balls are big as bowling balls, so full of cum... My sexy male scent is very powerful indeed..."
It would not take long for your cock to swell even larger, and erect. It was fully a horse phallus, and as it grew, the tip just barely reached to your lips, head flared widely in true equine fashion. This was but the first of a few exciting changes!
Even more tingling, and a pleasurable shake later, your balls begin to get heavier and heavier between your legs, the fur covered patch growing thicker and slightly wider. The thin fur over your sac and groin region seems almost to shine with a musky oil. From the scent, you could probably bottle it and make a fortune!
Lost in thought, your head swimming with the pleasure of your newfound organs size and sexual ability, you speak into your mirrored reflection...