Mary decided to have half of the vial. With her mind decided, he drank half the vial and waited for the changes to start.
First, sharp horns grew out of her forehead, and were about a foot long each, then her ears became six inches long and pointed.
Then she felt her feet beginning to be cramped and she rushed to take off her shoes and socks, and her legs became reverse-jointed, ending in big toes with sharp, curved, black claws, and her fingers now ended in them too.
In addition to wings sprouting from the back and height vastly increasing, the skin will pale, the eyes will change to an orange-gold hue, and the cheeks will narrow prominently.
Her skin began to crack with black lines before her skin pales to a light grey as she was slowly growing larger and began to stretch as her body began expanding.
Mary turned to look at her back as it began swarming with new muscle and flesh, tearing a hole in her shirt revealing a giant pair of bat wings growing out of her back to a span of eight feet total.
Her abs became chiseled, a tremendous six pack emerging where there previously was none. Breasts became massive tear drops of flesh, elevated by equally massive pectorals.
Mary's hair became the same color as her skin as it became three large strands of tendrils which intertwined becoming a ponytail.
Her pupils became slits, and she grew sharp fangs, not enough to poke out of her mouth, but just enough to give her a cute overbite.
Mary watched her hands and saw her fingernails lengthen, almost becoming black claws. Incredible pain wracked Mary's face as it started to morph.
Mary roared as her body kept shooting outwards and upwards. Her now large frame shuddered as her growth came to a stop.