Castiel was confused.

While yes, he had gotten better at grasping human emotions, he still was a novice in romance. And according to Dean, these feelings were romance. The way he always wanted to be around you, his overwhelming desire to protect you, and the warm fluttering of his grace when you smiled. If Cas had a heart, he's positive it would race in your presence.

It was a tentative dance the first few months. He'd give you a blunt compliment, you'd blush and look away. You'd take him out to do something mundane and human, and he'd be in awe of your world and how touching it was that you included him. This all drove the Winchesters fucking insane, but Cas didn't notice.

It all accumulated in one night. You were having a nightmare, and Cas had blinked into your room as usual. He sat on the edge of the bed and ran a hand over your head, a faint blue glow of grace in his fingers.

"Ol'm kures, g're safe," he whispered in Enochian. He kept speaking the tongue of angels until you started to stir. Castiel froze, staring wide-eyed as you sat up. There was a spark of longing so profound that it immediately registered in his mind, like a prayer.

"Thank you," you murmured, leaning closer.

"You're welcome," he said, bringing a hand up to your chest. He was fascinated by your heartbeat. You're warmth. You're noses were touching now, your breath fanning across his face. And then your mouths were together. The two of you were like puzzle pieces, your lips moving in tandem until you couldn't breathe.

Castiel's powers surged at the overwhelming sensation. The lights in the bunker flickered and burst, and Sam immediately started yelling down the hall about a power outage in town.