"You'll never get away with this Lucifer! I'll never say yes to you!" Sam screamed backing away. "Oh, Sammy you don't need to say yes. You see I found a very magical person who saved this vessel from ever burning up." Lucifer said with a sinister smile. "We will find a way to stop you Lucifer you will su-" Dean stopped mid sentence looking to lucifer who stood there frozen.
Before he could ask Sam what was going on Lucifer smiled. "Duty calls boys. Do stay here I'll only be a moment." and with that he was gone, leaving the brothers with dumbfounded looks on their faces. Lucifer appeared before a woman who looked to be on the brink of death. "You poor little human. Reduced to begging little ole me for help."
Lucifer cocked his dead to the side. "I guess since God isn't here to help and you're not that bad looking I could help you. I mean you did say you'd give anything." Lucifer started walking over to Eva and ripped the branch out of her stomach letting her fall into his arms. On the way to a nearby tree he healed her to the best of his ability. As he was setting her down he whispered into her ear, "When the time comes I will ask you for a favor. It's your choice if you help or not, just remember I did save your life."
As he stood back up he manifested something in his hand, a necklace with a black feather and a small little pentagram on it. He put it on Eva and zapped back to where the brothers were. "You boys should probably make your way up that dirt road there before a curved beauty starts screaming my name all through the town" the brothers looked to each other and ran to their car.