"Are you flirting with me?" sam/jack like. please.
He doesn’t say anything the first time, because he honestly doesn’t hear what Jack says when Sam announces the door to the kid-sized gingerbread house “looks a little tight”. They’re working a case, this sinister reinvention of the Hansel and Gretel myth with missing kids. It’s already a weird case. No one can pin down a monster responsible, and if Dean hears Jack say “trans dimensional portals” one more time he’s gonna shoot someone (probably Jack). But it was the WAY Jack said it, that made Sam look twice.
The second time he couldn’t believe his ears. They were interviewing a witness to one of the kidnappings and Jack just casually refers to him as “long, tall, and handsome over here”. Dean rolls his eyes to high heaven and Sam’s surprised to find his cheeks burning. Dean’s usually the one getting off-handed comments. Dean. Not him. He gets called a moose, or something even less pleasant. But Jack’s honest-to-god looking at him like merchandise on a rack and Sam just doesn’t know what to do, or say, so he ignores it, pretends like it never happened. But he notices Jack more.
The third time it’s Dean who says something, cause he’s had it ‘up to here’ with ‘Captain Cracker Jack’. Dean doesn’t like the way Jack handles things, he doesn’t like the way Jack barks off orders, he doesn’t like his coat, or the cut of his jaw.
“And I swear to god if he hits on you more time I’m gonna knock him back into next Tuesday!”
Sam looks at Dean like he’s hearing him curse for the first time. “What?”
Dean looks at him blankly. “It was a joke,” he explains. “Because he’s always on about time travel?”
Sam takes a few minutes to register the disconnect but Dean waves his hand and continues to make a list of boundaries the Captain shouldn’t cross and a corresponding set of consequences if he did.
The fourth time Sam is researching witches and children sacrifices and he’s pretty sure he’s close to figuring out how to kill whatever’s doing this when Captain Jack Harkness leans over him and peers at his screen.
“Found anything yet?” It’s an innocuous question, but he’s closer than he needs to be to ask it.
Jack smiles at him, easy and charming. “Let me hear you say it, you think it’s a witch don’t you?”
“If the shoe fits,” Sam shrugs. “Or, the pointy hat, whatever.”
“But you know how witches work right?” Jack has this look on his face, eager to explain some great mystery of the universe. Sam sits back in chair and listens, he likes to listen to Jack. “I mean it’s not really magic,” the Captain explains, “it’s a sort of word-science. That’s what spells really are. It’s like a combination, say the right set of words and you can make anything happen. So that’s how they’re opening the-“
“-Trans dimensional portals,” Sam finished with a grin. “Fair enough. But whatever she is, and however she’s doing it, I may have found a way to drop a house on her for good. So what have you got?” he challenged.
Jack smirked, when it came to a measuring contest he always won. “A way to bring those kids back.” And when Sam’s eyes widened, Jack chuckled at his surprise. “You’re kind of cute when you’ve been out gunned. Anybody ever tell you that?”
Sam felt that familiar heat. “Are you flirting with me?” He suddenly asked.
Jack laughed. “I’ve been flirting with you,” he confirmed, cocked his head to the side curiously. “Is that a problem?”
“No,” Sam blurts out, too suddenly he thinks. “It’s just. I mean, Dean usually gets stuff like that. From guys, I mean. Not me.”
He stares fixedly at his computer but Sam can feel the heat of Jack’s gaze. “This isn’t about Dean,” he says finally and Sam feels the flush in his face start to coil in his gut instead.