Serial killers AU, someone hits on Sam in a bar and Dean doesn’t like it.

“Hello, handsome.” A woman said in a sultry voice, placing her hand on Sam’s arm. If her red dress and designer handbag wasn’t the first thing that screamed trouble, her giant wedding ring and stilettos so high her foot was perpendicular with the floor certainly did. “How about I buy you a drink?”

Sam smiled alluringly. “Thank you.” he said and helped the woman onto the stool next to him. A few drinks and not-so-casual touches later, the woman was happily tipsy and well on her way to getting laid by this giant hunk of a boy. She could feel herself already tingling with excitement. All of a sudden, a shorter but decidedly more attractive man wandered over from the pool table and slung an arm over the giant’s shoulders. 

“Well well well, who d’you got here, Sammy?” The man asked. The woman perked up. She wasn’t anticipating a threesome tonight, but damn if she didn’t want one now that she had seen the two men together. Sam grinned.

“Hey, Dean. This is a friend of mine.” The woman held out her hand, and he took it in his and pressed a lingering kiss to the back. Sam leaned in closer to Dean’s ear.

“I think she wants to go home with us,” he whispered into the shorter man’s ear. The woman shivered in delight. Tonight was going much better than she had planned. Dean nodded thoughtfully.

“You think so?” he asked rhetorically, eyeing up the woman. She straightened up and pressed her arms together subtly, pushing her cleavage out that much farther. “Hmmm…” Dean hummed deeply, his gravely voice dropping in timbre. The woman barely kept herself from drooling. 

“I think that’s a good idea.” he said at last and helped Sam stand. Sam downed the last of his drink and helped the woman off her stool and into her coat, Dean rubbing Sam’s back all the while. They walked out into the parking lot and Dean held the door to his impala open for the woman as she climbed in. She was practically vibrating with excitement as the men took her to a seedy motel nearby. They checked in for the night (the woman was sure the max these men were going to pay for was 2 hours, but she was happily mistaken) and moved into the room they were given. Dean had a duffle bag in one hand, and the woman looked at it curiously. Maybe they had brought along some toys…the woman felt herself get wetter just thinking about it. 

“Why don’t you go take a seat over there for a moment,” Sam whispered into the woman’s ear and motioned to the chair in the corner. She dutifully did as she was told, delicately crossing her legs and placing her handbag by the leg of it. Dean moved behind her, fiddling with the zipper on the bag. Sam sat down on the king mattress, staring at the woman.

Suddenly, a rope flew over the woman’s head and was fastened snugly around her waist and arms. The woman cried out, but something hard hit the back of her head with enough force to make spots dance across her vision. 

“Shut up, bitch.” Dean said coldly, quickly and effectively gagging her with…she didn’t even know what. “The minute you laid your hands on my Sammy, you were dead.” He grabbed her chair and dragged her across the carpet to the center of the room. “And know I get to have a little fun…” he growled the last word in her ear.

Sam smiled and waved from his place on the bed.

“You see,” Dean started conversationally, “Sammy’s been mine since the day he was born. Dad put him in my arms and I knew. It was instant. And I don’t like it when somebody touches what’s mine.” He slid the tip of a knife down her arm, carefully not breaking the skin. The woman shuddered in horror; two brothers were going to kill her for flirting.

“Sam!” Dean snapped suddenly, making the woman jump. Sam hopped up immediately and quickly went to Dean’s side. He wound his arms around Dean’s waist and locked his fingers together over Dean’s stomach, nuzzling his nose into Dean’s neck.

“Yeah, big brother?” he asked darkly.

“Where should I start first?” Dean asked, the knife twinkling ominously in the light. Sam chuckled.

“Her arm. That’s where she touched me first.” Sam squeezed his brother lightly and pressed a quick kiss to Dean’s cheek before stepping back. Dean grinned.

“Shall we begin?”