Cas rides him hardest during thunderstorms. Every bright crack of electricity in the clouds makes him shove his hips down faster, rolling them like the rumbling of thunder shaking the bricks in the bunker. His nails dig into Dean’s chest and this sight, Cas wild and strong, is the hottest thing Dean’s ever seen.
He moans Dean’s name like the word is punching him in the throat, rough and strained. Dean can’t imagine how intense it must be, how new all this pleasure is when there’s no holy barrier. Cas pulls him to sit up, hands cradling his jaw and teeth pulling at his lips as they kiss.
"I was made of it." They aren’t words as much growls and threats. "I was lightning and power."
Dean shivers and grabs two handfuls of Cas’ ass, delighting in the way he can feel the muscles shift as Cas fucks himself on Dean’s cock. He smiles and nips at Cas’ lower lip. “You still are, baby.”
He doesn’t think he’s ever seen Cas come so hard.