Dean had always expected that it would be a big deal, their first kiss. Because yeah, he had imagined it. Had even kind of anticipated it, if the way they’d been dancing around each other for literally years was anything to go by.
Therefore, the shocking part was that it turned out to not be a big deal at all. On the contrary; it came so naturally that Dean didn’t even realize it until after it happened.
It was the same old ritual: them saying goodbye after a short briefing at a smelly motel. There was always something or someone to save, and somehow it often ended in Dean and Cas splitting up, if only temporarily.
“Please be careful, Dean.” Cas was saying the words so earnestly, blue eyes intense, as if Dean hadn’t already survived hell, purgatory, and more than one almost-apocalypse.
“Always am.” Dean mumbled back dismissively, the cool morning air making him shiver a bit as they said their goodbyes in the motel’s foggy parking lot. “You be careful too, okay?”
“Good… And I will.” Was all Castiel gave him in return, before he cautiously leaned in to lightly kiss Dean on the cheek.
At first, Dean didn’t know what to make of the gesture. A kiss like this, even on the cheek, seemed to be far too intimate to be common for a goodbye between two buddies. And so Dean decided to take a chance. Before Cas could turn away and head for his car, Dean placed a firm hand on the angel’s shoulder, returning the favor by kissing Castiel right on the lips. Those lips were blissfully warm and smooth against Dean’s, and Dean didn’t regret any of it, because miraculously, it wasn’t weird or forced. It was simply something that had been inevitable since the day they’d first met; something meant to happen at some point.
Cas blushed, and Dean was sure that his own face was flustered as well, but he couldn’t find it in him to care.
“I’ll see you soon?” Cas asked, the same as he always would whenever the two of them were forced to say goodbye.
“Soon.” Dean replied hopefully, just like he always did.
As Cas drove off, Dean knew that even though everything had changed, at the same time nothing had changed. It was a pretty good feeling, and he smiled broadly while he watched Cas’ old beat up car until he could no longer see it.