You have had a crush on Amelia for years and have many times fantasized about marrying her. Since any relationship you could of hoped for with her is now hopeless thanks to your sister; you decide to become one with her in a more literal way.
Not wanting to destroy the parts of Amelia that made you like her, you do your best to leave yourself as mostly Amelia. You even go so far as to make her personality dominant in your new combined form.
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