The Winchesters needed answers to questions and they knew Lucifer would have it so they started to summon him.

They had the pentagram trap, the candles, everything they needed. All they had left was to say the words and summon him. Sam picked up the book, and read the words aloud. The only light in the room being the fire from the candles.

A red flash appeared in the room and... There he was. Lucifer himself. Lucifer looked around immediately spotting Dean and Sam glaring daggers at him causing him to smirk and greet them in amusement.

"Oh-? Oh! OOHHHH!!!!!! Well well well, if it isn't Dumb and Dumber! To what do I owe the pleasure?" Lucifer asked in mock friendliness at the Hunters while looking in a bored manner at his surroundings, he doesn't seem to have noticed you yet.