The yellow smoke almost looks toxic. You're not sure what would happen if you breathed it in. Thankfully, rather than spread throughout the room, the smoke compresses into a single point in front of you, taking shape. In a moment, a woman is standing before you, dressed in a traditional genie's outfit. However, you're not paying much attention to the outfit, noticing more the genie's face. Her cheeks seem to be puffed out in an unusual fashion, in a way that makes her mouth pucker a little.
Suddenly, you hear a voice. But it's not the woman speaking, and in fact the voice sounds distinctly male. "Greetings. I am the genie of upside-down transformations."
Glancing down toward the source of the voice, you discover that this female genie has a very male penis, pointed directly at you. You do a double-take as you realize that on the glans of the penis are a pair of eyes. Suddenly, the urethra opens and speaks, revealing it to be the source of the voice. "You do not have to say anything. I know the sight of me is very surprising for you, possibly even grotesque. Allow me to explain. First, yes, I am the genie, not the woman standing before you. Over 1000 years ago, I was a regular man, and in fact a performer. My specialty was walking on my hands. I loved the lower vantage point, and making my hands act as feet. I so wished I could live that way forever.
"Then, one day, my wish came true. I met a rich man who enjoyed my performance so much, he wanted to repay me by allowing me to have one wish from his own genie. I wished to be upside-down transformed into a genie, myself, one whose specific purpose was to spread the joy of being upside-down transformed. And so I found myself with my hands really becoming my feet, as my head became the penis belonging to the woman who was once my butt."
That would explain the woman's puffy face. Speaking of whom, it was now her turn to speak. "And that is when I was given sentience. I have a vague sense of what it was like to have been his butt, and now I have the mind to appreciate my old life, as well as enjoy the one I have now as my own person."
The genie continued. "Sadly, the rich man was appalled by my willingness to 'disfigure' myself in such a way. At the same time, his genie was proud of his handiwork, and disappointed that his master had reacted in such a way. He couldn't retaliate against his master, though, so he granted me the extra ability to alter reality, allowing those that I transform to begin their upside-down lives without repurcussions such as I had just experienced. Which brings us to now.
"I can grant you an upside-down transformation, either to yourself or someone else. Reality will be altered as though you or that someone has always been that way. You and everyone involved with the transformation will be the only ones aware of how things used to be. This includes the sentient life created from the transformation, as I want them to enjoy their new awareness such as my butt has." The woman smiles at this, a strange look given her puffy face.
The genie continues furthur. "The UDTF, as we'll call it, can be into human or otherwise, any gender or none.
The new life can resemble their original form such as my butt has, or look indistiguishable from a normal being.
Likewise, you could retain some amount of your original human features, such as I have, or look indistinguishable from the part you have become.
You could be transformed into a butt, genitals, or anus. You could also become a tail, if you UDTF into an animal.
You could retain sensation of your original body, or have your sense of self reduced to your new form.
You could retain any or all senses if you wish, even if you lack the physical ability. For example, you could still see without eyes.
You could retain the ablity to speak, such as I have, or you could limit yourself to telepathic communication with your host. You could also forfeit all ability to communicate.
Which reminds me, you as a body part could have physical control of yourself, or forfeit control to your host, as though you were a normal body part.
These are all the ways in which I can transform you. And of course, these extend to my ability to transform someone else, as well. With that in mind, I can only transform one individual at a time, and transformations are one-way; I myself would not wish to take away the new host's life as an individual. As for how many wishes you get, as many as you want, until I am allowed to move on and find another master. If you transform yourself, I will still remain indentured to you. Though if you transform yourself in such a way that you can no longer speak out your wishes, your new host will become my master, instead."
While you are impressed at the variety of options, you are disappointed that they all revolve around one specific transformation. No wishing for a car, or true love, or even to be transformed into a regular animal, yourself. You ask the genie what benefit there would be in upside-down transformations.
"I will provide some examples. I've had some masters become genitals, experiencing pleasure unlike anything they've experienced. I've had some masters who transformed into the opposite sex, so they could be accepted by their crush, even if the transformation left them as a butt instead of a person. I've had some masters transform others with malicious intent; though I will say it is my intent to make my transformations enjoyable, so I made sure those transformed would eventually find joy in their new forms. I've had some masters who wanted to leave behind their stressful lives, transforming for the much simpler life of a body part. Some of my masters, in their old age, upside-down transformed into a younger being to extend their lives. Some who had lost their ability to walk traded their individuality for mobility. Some masters wanted to experience life as a wild animal, but lacked the knowledge of how to do so, and so were thankful that their new hosts could live the wild life for them. I've even had some masters wish for a life of solitude, living as nothing but a sentient body part, isolating themselves with only their base sense of touch and no form of communication.
"Those are but some examples of past wishes. Do any of those appeal to you? Or do you have something else in mind? You may make your first wish whenever you are ready."