The object the Wizard presents to Anna turns out to be... a lame looking neutral face mask, simple, white with some barely defined, ambiguous facial features and holes for eyes.
Anna looks a bit disappointed. "That's it? Doesn't look very impressive to be honest."
The Wizard hands her the mask and explains. "I agree it looks rather unassuming at the moment my dear, but you are holding a powerful enchanted item. Not to scare you, it's mostly harmless but I will advise you to be careful with it. It should be used wisely and with moderation. Take this as advice from me Anna, and know that in case things get out of hand you may always seek me for help."
Anna felt a bit uneasy now. "Okay, thanks I guess but I'm sure I can handle it, whatever it is... So what exactly is this mask, what does it do?"
"It's called, the Mask of the Alter-Ego. The enchantment gives it almost a will of its own which will decide who the wearer becomes. Who it wants you to be. The Mask will always tend to change its wearer into someone who is in stark contrast to their real self, so for example a beautiful attractive woman such as yourself should be made plain and less sexually appealing. That is exactly what is needed as I explained earlier."
"Okay, I hope that it doesn't go overboard and make me super ugly though!" Anna laughs nervously.
"Remember Anna it's all about the quality of your character not your superficial feminine charms..."
"Right, right... Okay so how does this thing work, I just put it on or...?"
"First let me bind it to you." The Wizard recites some words in an unintelligible language and the Mask glows faintly for a moment. "Done. Now that it's bound to you, you are its Hostess, meaning only you will be able to wear the Mask and no one else until the binds are severed by an unbinding incantation."
"Cool." Anna winks at the Wizard and is about to don the Mask but the Wizard halts her.
"Wait, before you wear it let me tell you how the enchantment works so you won't panic. I assume it won't be as you imagine it... Once you place it over your face it will almost instantly stick to your skin like it were welded. It won't hurt don't worry, well putting it on won't hurt although the removal is quite the opposite but you needn't worry about that right now. Right now putting it on is what's important. Know that when the Mask begins its transformation it cannot be stopped and you cannot remove it, you must wait until the process is completed. Know that it will not simply cover your face. The material the Mask is made of will change to very real flesh and skin and it will quickly expand to cover your entire body. You will be encased totally, within someone else's skin in the realest and most literal sense."
"Freaky. So like a sort of human costume? Very fucking bondage!" Anna sounded a bit aroused, being the kinky girl that she is.
"A costume made of real flesh my cheeky girl. Do not take this so lightly, it's not a perverted toy!"
"Pfeh, whatever Magic Man, you're making it sound even kinkier." Anna sticks her tongue out playfully. "Enough talk, here goes!"
And with that Anna simply raises the Mask to her face and presses it on with both hands. As soon as it makes contact she can feel a tingle all over her face as the inside of the Mask glues itself to her skin. The color and texture of the Mask begins to shift from smooth white plastic to a very human looking skin tone complete with pores, then the new "skin" quickly begins to expand in all direction, engulfing her entire head, hair and all in a mere second. The "face" still didn't have any real features, not even ears for now, just an ambiguous, hairless and featureless general human head shape. Anna still gasps in shock despite her earlier bravado and she rushes to the nearby full height floor mirror to see what will happen. The new layer of skin was quickly expanding down her neck, going past her sexy collar bones and down her slim shoulders and perfect cleavage. She feels her heartbeat accelerate from both panic and excitement and watches as the new skin seeps ever downward, under the start of her tight black tube dress and all over her proud C cup boobs.
But what kind of person would you like the Mask to make Anna into? First let's decide the gender!