You put your brother in the trusty hands of an elderly Kitsune you met while you went to find this hunter. You knew he was Dean Winchester and he was good at covering his tracks. But you didn't only train in fighting and strategy, you trained in forensics and became a licensed detective. You could find him.

It didn't take too long and you found him at some old house. Bobby Singer. You knew immediately once you saw the shiny, black Impala amongst beat up, old, dirty cars. You stalked them for a while. Watched and found it what they were doing. You had a few close calls with misplaced and noisy car parts on the ground but they still didn't know you were there. You hoped, anyways.

It seemed one of them was going crazy or something. He could see Satan or some insane crap like that. You just knew that Dean was in a vulnerable place and you wanted to take advantage of that. First, you needed the tall one. Sam. Once you had him Dean would kneel and kiss your feet if you so desired. Dean and Bobby caught wind of a case (that you may or may not have set up) and so Sam was left alone. Absolutely perfect. Sam fell asleep so you snuck inside, drugged him to ensure he wouldn't wake up, and carried him back to your temporary base at an old abandoned cabin in the woods.

A while later Sam's phone started to ring which woke him up. Sam was tied up so all he could do was stare at you while you held his phone and ask you questions.
"Who are you?" And "what do you want?" And even "let me go."
After the 4th call you instructed Sammy to say some things while holding a rather sharp knife to his neck and picked up the fifth.
"Dean...help me...please." Sam said and you held up the phone to him. You took the knife and cut a long cut down his arm. He let out a muffled scream and breathed heavily. Dean was screaming in the other line.
"Sammy! Where are you! What's going on! Who's doing this to you!" And so on.

It was your time to shine. You lifted he phone to your ear.
"Hello, Dean." You said.
"Who the hell are you?!" The hunter questioned angrily.
"Oh you'll find out soon enough," you stuffed a gag in Sam's mouth, "now if you want to see your little brother ever again you'll do what I say, okay, big boy? Meet me at the abandoned clothing factory in 5." With not another word you hung up and left.

You waited at the factory and finally the one you wanted showed up. With a serious expression on his face and and leather jacket, in all of his glory. You smiled at him and sighed.
"This..feels..so....relaxing." You hummed, "finally getting what I've earned."
"And what would that be?" Your target asked.
"Your head on a platter with whip cream and a cherry on top." You said, "Sammy'll get to hold a nice funeral for you. Y'know, burn the bones and all that jazz. Sammy'll live if you don't, you know."
"..why?" Dean asked, confused.
"Because he's not the one who stabbed my mother like she was a stick of butter!!" You snarled, "Sam asked you, no, BEGGED you, I know, to NOT kill her. And what does the big, strong, all knowing older brother do? He goes and kills her. In front of her CHILDREN, no less. Yes, I was there too. I was hiding in the closet, sobbing. I wasn't strong back then otherwise I would have torn you a new one right when you stepped through that door." You pulled out a gun. You could see guilt practically smeared all over Dean's face. You loved it.

"I'll tell Sam you said bye." You said as you pulled the trigger. Dean avoided it somehow and ran. You chased him, shooting while you ran. Some grazed him but none hit. You soon ran out of billets and chucked the gun, more than ready for a fist fight. Dean was still running but you would have none of that. You jumped and tackled him to the ground, your nails extending into claws. You slashed at his cheek and made a nice scar but he was still tall and buffer than you and flipped you over, switching your positions. He held your wrists down and you lost it. You screamed and struggled and kicked and flared, practically foaming at the mouth. You were NOT going to let him live. Never. Not after two years of working for this moment.

Your claws extended even more and dug into Dean's flesh. He yelled and flinched but that was enough for you to kick him off. You hopped up and slowly walked towards him, panting like a wild animal.
"You killed her without a thought. She didn't even do anything! It was ME! I KILLED THOSE PEOPLE FOR MY BROTHER AND SHE TOOK THE BLAME!!" You screeched, "SHE WAS THE NICEST, MOST THOUGHTFUL AND GENEROUS PERSON EVER! YOU TOOK HER AWAY FROM US!" You ran forward, slashing and stabbing at Dean who looked horrified to hear this news.
"YOU DIDN'T EVEN QUESTION WHETHER WHAT YOU WERE DOING WAS RIGHT OR WRONG! GUESS WHAT?! MONSTERS HAVE FEELINGS TOO!" You lunged at him and were able to slash his face again. He was surprisingly quick for his size.

You huffed and puffed from your little temper tantrum and pulled out a knife, jumping on Dean and attempting to stab him. He held your arm but rage and adrenaline were pumping through your veins and he could barely hold you back. Dean finally sat up and head butted you, causing your world to spin and you leaned back slightly. He shoved you off then kicked you in the head, knocking you out. You had some info he needed.