Monroe doesn’t realize he’s doing it at first- whenever Nick is in the room he gravitates toward him, head turned to bare his neck without conscious thought, highly attuned to every movement and mood of the Grimm- and it takes an offhand comment from Hank before he even begins to think, begins to wonder what exactly is going on.

He takes some time to watch, to notice the things he’d been doing without knowing, and it doesn’t take long to realize what’s happening even though he’s fairly certain something like this shouldn’t be a thing; his wolf thinks Nick is his alpha even though he’s not even a Wesen, even though he’s a Grimm, and he’s been acting on instinct.

Nick thinks it’s hilarious when Monroe tells him, and Monroe might be offended if it weren’t for the way that Nick leans in and tenderly kisses the sensitive skin behind Monroe’s ear when he bares his neck for his alpha, this time in full recognition of what the move means for them both.