Sam/Jo, AU, set some time after the end of season 3
It takes him ten minutes to notice it's her behind the bar. In the first twenty seconds, Jo's body is ready to fight and her hand moves towards the knife hidden in her belt. When he realizes, his eyes open wide, tired, apologizing for a crime he didn't commit. She saves him the hard time, taking out her pen to note down his order. Not that she needs it, but he isn't the monster who attacked her and, anyway, she knows he's had way more than enough. She notices, as she goes from one table to the other, how he's checking the weather forecast and how he's barely eating, although there are soon three bottles of beer next to him. When she's done with her shift, she offers him a ride, glaring at the bottles. He shrugs, takes his laptop and walks with Jo to her car. On the way to his motel, he asks her about what she's been doing. She explains the hunts she's prouder of. They are soon there and, when he gets out of the car, she shivers thinking of Duluth. The next day, he appears in the bar to get the Impala. They exchange e-mail addresses to keep each other updated on the job.
It takes her over 10 e-mails, three visits of Sam and two shots of tequila to propose him a hunt. The first one is an absolute disaster. They lack coordination and Jo accidentally hits Sam with the shovel used to unbury the bones. When they are done, both are so angry they just can't look each other on the face. They've spent five minutes silently sitting inside the Impala when Sam bursts out laughing. The situation's been so ridiculous she has to admit it's hilarious. He travels back and forth for little hunts in the states nearby. They often go together on her days off and their work as a team gets slightly better.
It takes them three hunts together to change twins for a double room. One night, she's stitching up his eyebrow when his hand abandons the bottle and moves under her shirt. They are muddy, exhausted and partially drunk due to anesthetic reasons and it doesn't last much, but it feels good and it gets better in the morning, when, after a shower, he lifts her up in his arms, her back against the cold tiles of the bathroom wall and her nails leave marks on his back for a week. Life's then almost easy, like a game with taboo words. You never mention Dean to Sam. You never mention Sam to Mom. You never mention Sam's drinking to Bobby.
One day, he fucks her before breakfast, like he does every morning they wake up together, and she leaves for work. When she's back, there's a note in the kitchen "SOMETHING BIG! Will call. Sam." It takes Jo three months to see him again and, when she does, that demon is behind him, like a black shadow.