8.
The next time Dean steps in the elevator, Castiel is there like nothing has ever changed.
Of course, that includes his tie. It looks just as pathetic as on the first day.
"Hello, Dean," Castiel says with his soulful, blue puppy eyes. "Hey Cas," Dean returns the greeting after an awkward pause. The ride is quiet, neither Dean nor Castiel comfortable enough to break the tense silence.
9.
Dean restrains himself for almost another week before a pained sigh escapes him and he nudges Castiel around to adjust his tie. "Jesus, Cas, I'm sorry but I can't have you run around like this. Don't you know that you look like you just…"
Then his words fail him, since he feels like telling Castiel that he looks like someone fucked him against a wall would be a little inappropriate.
"Got out of bed?" Castiel ends Dean's sentence sheepishly, and he looks up to Dean before averting his eyes with embarrassment. Dean wants to cry a little, until the more rational part of his mind reminds him that they are kind of in each other's personal space right now and he gives Castiel's tie one final tug and takes a step back.
10.
It becomes a thing for the two: Dean fixing Castiel's tie, Cas getting acquainted with and very comfortable in Dean's personal space and Dean masturbating like a sexually frustrated teenager.
The last part obviously doesn't happen in the elevator with Cas. A little, desperate part of Dean isn't entirely happy about that, most of him though is just internally mortified every time Castiel goes so far as to roll up his sleeves and reveal tan forearms and slim wrists.
While Castiel remains oblivious to Dean's age inappropriate lusting, every now and then there will be a third person in the elevator who will usually give them a look. Sometimes when that happens Dean will be a little less gentle and say something along the lines of "Dude, you really need to learn how to do your tie". Castiel will give him an apologetic look and say "Yes, Dean" and the next day his tie will be just as crooked as always.
11.
At some point, Castiel listens to Dean and gets more ties in different colours.
He still can't tie them properly, and Dean still straightens it every day and mocks Cas about it.
Subsequently, Cas stops trying at all and just hands Dean his tie with a dead serious face. Dean should probably feel bad for having this many fantasies about all the things he could do to a tied up Castiel.
After a long weekend, Cas turns up particularly sleepyeyed and with permastubble even worse than usually. Once he's finished with the tie, Dean can't help but run his knuckles over Castiel's jaw. "Nice peachfuzz," he grins.
"Thank you," Castiel says, then he does that thing where he tips his head and frowns a little and Dean laughs and thinks that he hasn't been this much in love since senior year.
12.
As summer hits the town with full force, Dean spends the cool, early mornings in his garage working on Baby.
Also, Castiel's brother Balthazar visits and takes the elevator with them for a couple weeks.
One day Dean forgets the time and has to come to work in Jeans, T-shirt and a plaid shirt (probably one that Sammy forgot at his place). Balthazar asks him what he was doing, of course he does, and gets Dean talking about the Impala. "So you're a part time mechanic?" Balthazar concludes with a smug side glance to his brother and that British accent dripping with something Dean can't pinpoint.
This causes Castiel to stare at Dean with his mouth half opened and then blush furiously, worse than when Dean first fixed his tie. It's adorable, a word Dean normally avoids like the pest, and also really, really fuckable.
Dean is so screwed.
Just as Dean steps out of the elevator, Balthazar grins at him and says, "You see, my darling brother has a phenomenal mechanic fetish," and then the doors close and Dean wants to kill the guy. After questioning him about any other potential kinks that might come in handy.