You feel a weird wave of energy run over your body and after a second you open your eyes. Looking to your right you see a perfect copy of yourself. They wear the same clothes, the same hairstyle, and the same look of amazement on their face.
"Hi" you greet yourself in perfect unison, which makes you both laugh.
After a moment of inspecting each other your clone asks you what to do next, since you are the original.
"Well, as you probably know" you start saying awkwardly and a bit shy "I, or rather we, have been reading stories about people transforming for years. Our favourite stories were always the ones where people transformed either by accident or by circumstances that were not entirely in their own control. I never imagined that I'd be in a situation where I could experience something like this myself, but now that I received this incredible device I can. I'm not ready to use any of the random options, and I don't want to give my entire being into the hands anyone I know just yet, so I thought I'd give that power to someone I can trust while still being on the passive receiving end of said transformations."
Throughout your explanation your clone nods understandingly, having been a part of you they know exactly what you mean and gets exited by the endless possibilities of what is to come. They also know every desire you ever had, even if you never dared to talk to anybody about it.
They sit down in front of the PC and after a few minutes of them clicking and you waiting in anticipation they say they are ready and initiate the first change.