No, but, you see. That look in the second gif? That's not the look Castiel gives somebody he's never met before, just because they think he's hot. That's his knowing fond-sly "oh really?" face.
So what this says to me is they've already met. They met at A Thing a month ago, maybe Sam's 21st which was mostly Sam's university friends but Sam insisted on dragging Dean along, and Dean's not their type and he can't talk to them because they all talk about smart things and social issues and Dean's just a dumb mechanic, okay? and ends up sitting grouchily in the dark in a corner booth nursing his drink.
But Castiel ends up in the same booth, because his sister dragged him here for some other reason and he's hiding from Meg who's rather too attentive, and Dean laughs and lets him hide, and for some reason within ten minutes finds that he's brightened right up and they're chattering away as if they've known each other for years, even though Castiel's filthy rich with old money and also working on his PhD and that's even less Dean's type than Sammy's friends, right? Only there's something about his eyes, and the way he smiles down at his hands, and his cluelessness about the noises he describes his car as making and the way he scowls over it, and the things he half-says in a soft sort of way about his family, and the way he looks at Dean and sees right through his bullshit...
Then they met again, a week after that, quite by chance, when Dean's out playing wingman to Charlie in a gay-and-others club, and he gets so distracted talking to Cas (and hey, if the guy's here then there's a possibility, right?), and leaning in just a little closer, and watching the self-satisfied curve of Castiel's mouth and just about to lean in right there, that he loses track of everything else. And then suddenly Charlie's dragging him away because her friend Gilda's in trouble, sick or roofied, and suddenly Dean has to swing into protective mode and Castiel has to help drag her away from whatever about-to-be-nasty is about to go wrong. Then they're bundling her into a taxi, and hopping in with her to be sure she's okay, and before Dean can look up and grin and ask for Castiel's number, the chance is gone, and they're gone, and he doesn't even know the guy's surname.
And the moment is gone. And Dean's cursing himself for days after that, because if he'd just asked sooner, just taken him outside and slipped away somewhere by themselves - but then Charlie might have got in trouble too.
And Castiel scowls a lot and asks intense questions of his friends who were there about who that man was, or that girl, or anything that might help lead him back to him, but draws a blank. And he possibly kicks his car once or twice, because it - she isn't running as well as she should be and he doesn't understand, and Dean talked about her like a living thing but all Castiel sees is a hunk of parts that don't do what he wants and cost him money.
And so they both give up after a couple of weeks, and Castiel goes back to his lonely, quiet room where he has to sit all day reading articles and trying to make something new and interesting out of it, then fold out the sofa into a bed with a creaky foot and a hard bar in the middle, and sleep all night in the same space, then do it all over again the next day. And Dean settles back into the garage and flirts and winks at everybody just the same as always, greasy hands on greasy rag, horrible coffee in the break room but he loves it just the same, especially the way Jo wrinkles up her whole face to complain about it and pretends she doesn't notice when he dumps extra sugar in hers because she wouldn't admit that she loves it.
Only then one day a Mr Novak leaves his cranky old Toyota, and Dean's muttering curses to himself about the idiot who'd let his car get to this stage, but he does what he can, keeps it in another two days to make sure it's safe because he can't let someone out on the road in this car until he's good and sure. And when Mr Novak comes in to pick it up, and Dean goes out all ominous and squared up to explain to an annoyed customer just why the bill's as large as it is...
... well, he gets a little side-tracked.
There'll be plenty of time to explain over dinner, right?