"And then what?" Castiel murmurs, free hand grabbing Dean's hair just hard enough to ride that edge of pain. He tugs his head back, exposing his throat as he continues to stroke him. "It's your birthday and you can have anything you want. Do you want to fuck me or I could fuck you? I could make you come just like this. Or I could take all the choice away, easily. What do you want, Dean?"