I liked this reasonably well, although the 2nd person narration was (as pretty much always) nothing but a distraction. I like how it wasn't immediately clear that the other man was a werewolf, and the reveal that he isn't there quite for what he claimed.
Any thoughts on why the werewolf bothered approaching him before starting the hunt? I'm thinking that perhaps the wife contracted him that way. She wanted to make sure the bastard really deserved it, and so she wanted to make sure that he would arrange a hit against her with little provocation if the opportunity arose.
So, was there any point of the panties exchange? Maybe she just realized he'd swiped her undies, and this was a very roundabout way to get her knickers back. (hell, maybe she really liked those skivvies, to the point that she hired the werewolf primarily to retrieve them)