Welp... you decided to get it... It was cheap and ran on magic so... at least it looked like some steampunkish furniture piece, and had... a function. If it actually worked properly you'd go inside, say generally who you wanted to become, and then poof you're that person... although the machine would fill in some details that you hadn't described. Which would often have you become someone of a different sex, race, age, etc. However the "magical ram" or something was extremely limited so it only would pay attention to the last aspect you had said. Thankfully two features made it a lot more tempting to use. First the machine would re-tailor your clothes so they would fit your new body, secondly the magic only lasted half an hour before your body would start reasserting itself after a full hour had passed... You weren't sure if you wanted to use it still, it did look nice in your apartment but... there were some things you could try having fun with.
Ok... one test... "Female?" poof wasn't exactly the right word. Maybe there had been some sort of effects once, but it was closer to just suddenly being different. Walking out you felt shorter and chubby, and looking down you could tell your breasts were large and the machine hadn't given you a bra. Your clothes fit right over your bulkier and curvier form. Going to your bathroom mirror you saw that you were some japanese... high schooler maybe? "The heck?" you asked aloud, and while the muscle memory told you this body may have spoke a different language... you didn't, and were able to speak english well enough... maybe a hint of an accent. So you did the next thing you wanted to... do some selfie poses, enjoy the feeling of your squishiness, and once half an hour past you decided to try to have fun jacking off with your reforming dick while you still had some of your femaleness. The test had told you a few things. First it wouldn't edit your mind, second the form wasn't completely random. It wasn't like you had become a giant baby with tits or something. The girl you became felt like someone who could exist and nothing inherently clashed. Third the pictures in your phone remained the same, it wasn't like it altered reality or anything like some of the items in the shop.