Through Love and Instinct
Austin doesn't know anything about Loki's dad, so if Shaun is surprised and bewildered, she feels more perplexed than him.
But then she remembered, Loki mentioned it before. Telling her that the author she love the most is a lycanthrope. And he sounds so sure back then, which she didn't understand, but now she did.
That the author she's been admiring all this time, the author that captivated her and made her to be fond of the lycanthropes, is indeed Loki's dad. That's why he sounds so sure.
She literally froze where she stand when Shaun called out the old man's name. Her heart swelled with so much happiness and she was overjoyed when she realized that indeed, it was her favorite author.
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