Mafia AU – The Uninvited (aka the one where I wanted to do a Halloween story!)
"What's he doing here?" Dean growls and stalks forward, glaring darkly at Lucifer who merely smiles in return.
"I just came to pay my respects to your father." The other man states before nodding his head at Castiel. "Hello brother, having a good time babysitting Dean still?"
"Lucifer, this party is just for private guests of The Father. You can pay your respects-"
Lucifer holds a hand up and shakes his head. "Actually, I was invited. Adam asked me to come and The Father thought it was a good idea. Just ask Mr. Singer."
Dean glances at Castiel, who nods and whips out a phone before turning his attention back to the other man. "And what are you suppose to be Lucy?" He grunts, looking the blonde up and down for a moment. "I don't think I've ever seen a douchebag as a costume but you're done a wonderful job here."
"No, unfortunately I couldn't think of anything more fitting than myself." As he says this, Lucifer produces a small red headband with horns and places it on his head. He turns slightly, showing a long red tail from the back of his pants and smirks slight at Dean. "I'm the devil obviously."
"Obviously." Dean replies dryly just as Castiel leans over his shoulder and confirms Lucifer's story. "Dammit... Look, just say hello then leave."
Lucifer smiles and nods his head, and as he starts to head into the Halloween party, pauses to look at Dean and Castiel once more. "If I may ask Mr. Winchester, what are you and my Brother suppose to be?"
"I'm an angel of the Lord," Castiel response nearly instantly before looking at a glaring Dean. "And he's my righteous man."
"Cas! Don't tell him!"
"Ah," Lucifer nods, even as his lips curl into a smile. "How fitting..."