Sam could almost feel like he's in control. He's the one on top, Lucifer's legs spread for him, his cock buried in Lucifer's ass.
But it's Lucifer's fingers hooked under his collar. His voice murmuring, "ask for my permission first, Sam." Far too amused with himself. "Ask for my consent."
Sam bows his head.
"Can I fuck you?" His cock throbs. Sam's desperate to move, to bury himself deeper. "Please let me fuck you."
"Yes," Lucifer says, and he pulls on Sam's collar, wraps his legs around him. Sam obeys, fucks him hard. "My boy king. My vessel. Serve me."