I love this face.
I love that it takes him a second to get it.
I bet sometimes he doesn’t get Stiles’ jokes. That’s why he tries to keep that same grumpy face around him all the time. And then he’s in bed or in the shower or out shopping and he suddenly figures it out, and he has to roll his eyes because it’s Stiles and it’s so lame and ridiculous, and then - dammit, he’s thinking about Stiles again.
I bet this happens to him aaall the time.