He's too tall, really. Castiel has to bend his head backwards almost uncomfortably to look the taller Winchester in the eyes. He gets rain in his eyes and has to blink every few seconds, and he suspects it looks like he's crying.

Sam strokes away the raindrops from his cheeks, and they feel more like tears than ever. Then he cups Castiel's chin gently before he dips down to press a chaste kiss against the angel's mouth.

It tastes like tears, not rain, Castiel notices dimly. He's standing on his toes, but it still feels like Sam has to bend in half just to reach him. He's never felt more vulnerable than he is right now; more human. If it weren't for the kiss, for Sam, Castiel would hate it.

Castiel lets out a shuddering breath as Sam's lips leaves his. He feels empty. Even as a first kiss, Castiel's first kiss in history, it's still goodbye.

The younger Winchester sighs, a quiet sound against the rain, and turns to go back to the house. Castiel doesn't move; instead watching Sam as he makes his way back to his brother and his life.

Castiel stands in the rain with his eyes closed, so no one can see the tears.