You first see that you start getting covered in white fur. Then you notice that your toes start to get stuck to each other and become harder. Then your head start to get reshaped. Your face slowly pushing out into a muzzle. Your clothes tear off your body, revealing a new grey wiry-haired tail swishing back and forth. Then your hair turned into a mane growing to the back of your neck.
"Wow" you say. Then realizing that your changes weren't over yet your cock and balls get sucked into your crotch and getting replaced with a vagina. Then your tail and mane become rainbow colored and you notice a bump on the top of your head the bump grew into a unicorn horn! As you looked in amazement at your new body jack pounced you and thrust his cock into you.
After a few more rounds jack said "when I saw free you will turn back into a male and gain free will but when I say slave you will turn back into my unicorn sextoy."