Fics like Doppelganger

Stanford Filbrick Pines is born a healthy baby boy, down to each of his six fingers. Stanley Danley Pines hatched fifteen minutes later, ready to learn everything he needs to know about being human from the infant in front of him. Neither of their parents suspect one of their children is not what he seems. or Stanley Pines is a shapeshifter. This changes nothing, until it changes everything.

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