The magic mirror has awakened, but as its purpose isn't to tell who the most beautiful pony in Equestria is, Twilight's curiosity forces her to find out what its purpose really is before the reassuring knowledge of reality is shattered by shameful lies.
Or said with simpler yet more complicated terms:
"A mirror is a flat surface that reflects light. A magic mirror is the same thing, but enchanted, so it simply doesn't just reflect light. Fun fact, there are many magic mirrors in the world."
Good job! There are a few punctuation errors here and there, but it's overall a great concept and a great story. I definitely would read your work in the future.
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Thanks. I have to admit I was worried about the concept being seen as stupid or too obvious. I'm very grateful that you took the time to give me feedback on that point.