It's funny how your world can change in the space of a minute.
There's a part of Sam that didn't want to see Dean again, ever, but there's an even bigger part of him that did and Sam can't help the way his stomach rolls over when he sees him, heat pooling in his belly and his pants suddenly, uncomfortably tight.
It's kind of like those dreams he's been having, every month, like clockwork. Except in his dreams he doesn't get up from the floor, he pins Dean under him and shows his brother exactly how much he's missed him.