Dean despised anything supernatural. Even harmless things like fairies or unicorns or the "good" supernatural stuff So when a werewolf offered to help him and Sam? He was hesitant. Sam decided the help would be good. But, werewolfs, much like dogs, were clingy and loyal.

Great. Now he has a werewolf living with him and Sam. Just great

At first, Dean didn't like you, he said you "reeked of dog" or "planning to hunt Sam down". But you stayed loyal like a good damn dog. He.. Eventually got used to you. But you got too used to him--- too comfortable.

You were attached to his hip. If he went on a walk? You were looming over him. If he went to take a shower...? You'd be outside the curtain til he yelled at you to get out.

Right now, he was making breakfast. You were breathing down his neck and watching him, the sizzle of eggs and bacon in the pan entrancing you to watch.