Sam laid his head in his folded arms on the table, trying desperately not to grab a fist full of Lucifer's hair, and force that hot, wet mouth down all the way. The fact that he was just a hallucination made the situation feel so wrong.
He could feel the ex-angel's tongue drag from the base to the tip in one long slide before he took it back in his mouth again. Sam let out a breathy moan, sinking his teeth into his arm to hold back more. None of it was real, but still, he could feel the unnatural heat in that space between his legs. He reached down, hand tangling in his hair, where he gently pulled. Guiding the devil's mouth. Why shouldn't he get to do something like this? After everything Lucifer put them through, he should have the right to work out some angry sexual frustration.
"Sam are you okay?" Dean's voice came out of no where. Sam bolted up in his chair, beads of sweat rolling along the side of his face. It took a panicked moment to remember his brother couldn't see Lucifer. Or feel him. "Sam?"
"Yeah, I'm fine." He quickly replied earning a weird look from Dean. Under the table, Lucifer teased his cock with small touches, and hot breaths just above the head. Sam struggled with keeping a straight face when all he wanted was to make the devil choke on it. "Really, it's alright." Just leave.
"You wouldn't lie to me, right?" He said, just to make sure, never one to just accept Sam was doing perfectly fine.
"Dean. I want to be alone right now. Please go." Sam's words were short, and barely managed. He heard the devil laugh. It wasn't funny.
"Okay, geez." He threw his hands up in surrender, then turned around. "Have your 'alone time'." Dean mumbled as he left. When he was gone for sure, Sam thoughts dove back into this fantasy he'd created around him.
He grabbed the back of Lucifer's head with both hands, and thrust his hips up. Again and again. -fuck- It shouldn't be this good.
Sam felt the angel's pulling his hands behind the chair, rope looping around his wrists, and he didn't care. Lucifer hummed in approval, and the vibrations went all the way through him. The chair moved back, and Sam didn't notice. The devil drove him closer, and closer to the edge. A perfect balance of pleasure and damnation, but then he pulled back. Lucifer stroked him a few times before standing.
The hunter lulled his head back, moaning at the absence of satisfaction. He heard a zipper being undone. The devil pulled his pants down just enough before lowering himself onto Sam, unbearably slow. Whimpering, Sam tried to get enough leverage to thrust up. Lucifer tipped his head forward, and they were caught in a not-kiss, that was all teeth, and growls.
Sam's wrists struggling against the rope, wanted to straddle the devil's waist and fuck him so much harder. The fallen angel held the sides of Sam's face, eyes shut tight, each thrust forcing a gasping sound out of Lucifer that was more erotic than he'd thought it would be. Sam pulled against his restraints. The arch-angel slammed down hard, once, twice, rolling his hips.
"Untie me." Sam breathed into his ear, Lucifer bit his neck in response.
"No." And that was it for Sam. That simple denial of freedom, the rope, being dominated. It all sent him over the edge. His orgasm rocked through his body, a low moan of ecstasy ripped through his chest.
Then he was alone again, wrecked and messy, and tied to a chair.