You can't I'm sorry, but that thinking will not ever get you anywhere in magic. What you are trying to accomplish is plain fluff And fantasy, and that usually is disliked on SoM.
Fluff is something that is nit a good idea to think. If your a fluff you usually don't know much on magic, and you believe in non mythological creatures like: werewolfs, fairies, nymphs, vampires.
While this isn't wrong, you must believe that you can't change ibrown a creature besides a human. You can't change your look, your DNA, and you can't change yourself.
Please don't take this wrong, but learn the basics of magic, and What it is and isn't. SoM is a serious site usually, and fluff many dislike and wont tolerate. This is the quickest way to gain a fluff rank.