At first you find it incredibly difficult to suppress a smirk, the whole thing seeming like some sort of perverse gag. Those thoughts are questioned, however, the more you look. Every species is provided with an image of the creature's reproductive organs. Not illustrations, either. But very vivid, detailed photographs showing animalistic cunts in their natural environment. You are still quite sure that the device is intended as some sort of novelty, though a small part of you begins to wonder if it's actually a barely-hidden cache of suspect porn. It makes you highly anxious, a bit worried about what somebody might think if they happened upon you at this moment. Still, despite your better judgement you keep at it.
Thankfully, you come across an option that lifts your spirits back up to about where they were when you started, bringing a bit of fun back to it. It seems you've hit the feline section, causing you to giggle a little in a sudden little bout of immaturity. What could be better than becoming the pussy of a pussy? You select the field for domestic cats, though for the moment leave the exact breed random. It'd take a lot of work to sort through all of them beyond this.
You confirm the choice, closing windows warning you of a permanent future as an animal's vagina, though one final box opens up, along with a choice. It seems that you could customize it a bit more, if you so desired. It goes on to explain a bit of the transformation. If it's to be believed, your mouth is going to become the cat's vulva, with the rest of your body forming into the womb, ovaries, and urinary tract. However, it also gives you an option for what will become of your nose. Normally it'd become a part of the vagina, though it offers to turn it into the anus instead. In either case it claims that you will be indistinguishable from a normal cat's rear. The detail it goes into is quite worrying, but it's still definitely a choice to consider. It's an amusing idea, certainly. After mulling it over, you...