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People say they fall in love slowly. It’s a gradual build-up of tiny moments as you slowly fall deeper in love with someone.
Dean thinks, maybe he did fall in love with Castiel slowly. He just didn’t notice it until now.
He’s sitting there, huddled next to Cas around the map table - temporarily distracted from their work as Cas is showing him a video about bees - and Dean is watching Cas more than the phone. He’s watching Cas smile, that full, gummy smile, attention solely focused on the video clip and Dean thinks “man, I love him.” And then freezes.
He sits there and stares at Cas, until the video clip is over and he turns to face Dean, rambling on about bees. He trails off, confused, as Dean just stares and makes no move to interact.
“Dean?” Cas questions, clicking off his phone and laying it face down on the table.
“Holy shit. I think I love you.”
“I love you too, Dean Winchester,” Cas replies earnestly. “I have since I first saw your soul in Hell.” He pauses, letting Dean have a few minutes to process.
After a while, Dean leans over and plants a chaste kiss on Cas’s lips.
“Now, what was it you were saying about bees?”