Dean is stunned.
There is this beautiful being...in love with him.
He's the one to touch Castiel.
He's allowed to shower the angel in affection.
He can make this celestial being moan and writhe and pant in pleasure.
He can be weak with Castiel, open and vulnerable.
He can give and receive.
He's the one who can make a soldier of god begging...more...don't stop...please...Dean, please...harder...
He can watch Castiel's pupils dilate in pure lust.
He can watch Castiel come undone.
He can watch Castiel rest, spent and sated.
He can see the love in Castiel's beautiful blue eyes.
He can drown in them.