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Starting from Season 3, but from Stiles' point of view. How he felt during possession. Eventual Sterek!!! It's going to be pretty canon for a few chapters until suddenly BAM!
Stiles is having nightmares of the Nemeton. He feels something inside him. Something evil. The only comfort he feels is from the brooding werewolf who changed their lives.
When is a door not a door?
Everyone has it, but no one can lose it.