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Basically another soulmate au. I own none of these characters

Everyone is born with a specific mark that pertains to their soulmate. The mark itself takes form into whatever creature is to be their soulmates favorite and it is to turn into their favorite color once you both touch. It was because of this that led to Severus's fascination with caterpillars, why? Because his soulmate seemed to have fallen in love with butterflies.