You were a ruthless demon; you were working with Sam Winchester- the man destined to free Lucifer from Hell. Of course, Sam had no idea that you were manipulating him for hells own gain; though, he probably would even care if he knew. He was head over heels for you you- though, the question of if it was lust or love was unanswered, but that wasn't of much importance.
You'd been feeding Sam lately- as in feeding him demon blood, your blood. Demon blood was dangerously addictive to humans and to people like Sam it gave them telekinetic powers; thanks to your blood, Sam could now exorcise demons- but he only exorcised the demons you told him to. He was completely at your mercy. He was addicted to your blood and did anything you said. He even turned his back on his brother, Dean, to meet up with you.
Sam had managed to get away from Dean for a day or two, sitting in a motel room on the bed, his leg tapping against the floor as he waited for you. You opened the door shortly after getting Sam's text to meet him. "I need more." he demands somewhat desperately, giving you those damn puppy eyes of his.