Threat to Earth (Pilot Chapter)

Y/N has been living her whole life on Earth (and believe me that's a long time), most the time alone. Now she has been marked as a "possible threat to the Earth". Because of SHEILD she now has to prove she can be trusted. But there might e distractions along the way.
(Set just after the first Avengers)
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story inspiration from @221b_blogger101 's true forms
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All characters except Y/N are owned by Marvel