Things had been upside down in the past few days, so much had happened and here you were, sitting in a diner with a hunter opposite you.
Your sister was dead..she'd taken a different path after you had transformed her into a werewolf as well. You'd had the intention of doing something good..of saving her life, yet the road to hell was plastered with good intentions and Dean ended up killing her.
Dean had been skeptical of you too but you had proven to be good-natured so far, that was why he had eventually decided to follow his little brother's request and let you run -
"You care about Sam." *Dean pointed out, his eyes boring into yours, calm and collected. He was studying you, his gaze unwavering, trying to catch a glimpse of any hidden agenda, any hint of ill intentions. He was taking a real chance here in letting you run after all "You've risked your life for us. You could be the worst monster in the world, but if Sam likes you, I'll tolerate." He said.
"But the second you harm him or anyone else, you're dead." He added in a low, promising tone and leaned forward, arms on the table between you. If you'd make a mistake, he would come for you. That much was clear.