Instantly you starts moaning loudly, beads of sweat rolling down your face. Small black hairs cover your arm, your body slowly grows larger and more feminine, face slowly pushing out into a muzzle. Your clothes tear off your body, revealing a new wiry-haired tail swishing back and forth. He kick off your shoes to reveal large hooves. You finally manage to take in what remains of yourself , a massive, black, female anthro stallion. He throws himself at you clearly attracted towards your new body. He then thruster his giant cock into your pussy and fills you with cum sealing you to your new body forever. After a few more rounds of violent sex jack mixed about a dozen more potions and said "let's go make a billion more sexy horse slaves" you nod your head in agreement as he pulled a book on the shelf and the shelf opened up to a secret exit. You follow him out the door and he hands you a few potions and a bag to carry them as you stride to the exit of the park and throw the potions into random people as you see them transform into black anthro female stallions.