Howl.

It wasn't until he had come back into the living room, two beers in hand and found that Nick had flopped down on the couch and curled up with a heavy sigh that Monroe took notice of the change in the Grimm's scent, Nick no longer smelt of lingering traces of danger and the wolf inside of him no longer bitched about Nick being the enemy, instead when he was this close to Nick he smelt of security, trust and family and his inner wolf bitched continuously that he wasn't nearly as close as he should have been.

It scared him.