Anyone who knew Rose well knew that she had kind of a thing for unicorns. Most of the fantasy novels she devoured had unicorns on the cover or involved them in some way. She collected unicorn figurines and several unicorn posters decorated her room. She was drawn to the vial with a picture of a unicorn on it. The description read: "Consumption of this vial will result in the user's transformation into a unicorn. Transformation will be in accordance with the user's gender identity--female-identified people will become female unicorns and male-identified people male unicorns. The transformation will last for twelve hours, unless the user has sex in unicorn form, in which case the transformation will be permanent, with no way of transforming back into a human or using other vials."
Tempting, but also risky, although how much trouble would it be just not to have sex for twelve hours?
Rose took up the vial and went outside. Clearly she didn't want to turn into a unicorn indoors. Tremblingly, she removed her clothes and drank the entire vial.
The first thing she felt was a severe pain in the middle of her forehead. A dazzling white horn emerged as she pitched forward onto her hands and feet. Her soft hands turned to hard cloven hooves, while her feet followed swiftly. Midnight black hair sprouted all over her body. Her face projected into a narrow muzzle while her teeth flattened into the teeth of a herbivore. She experimentally gave her new tail a flick.
Like many girls, Rose had a problem with physical self-image. Despite her beauty, she had always thought of herself as ordinary-looking at best. No longer. For the first time in her life she felt beautiful.