Disclaimer: Not mine, but I wouldn't mind keeping Dean.
Set after changing channels. Dean & Sam run out of gas but Dean feels a sudden pain in his back...
"Dean, why are you slowing down?"
"I'm not. We've run out of gas... apparently," answered Dean, frowning. "Which is crap since I filled her up not that long ago." He pulled over with a sigh, then turned to Sam. "Where was the last gas station?"
"A couple of miles away I think. Do you want to go get some? There's no use sitting here for hours doing nothing."
Dean shrugged. "But... what about the car? Someone might kidnap her or something."
Sam rolled his eyes. "Dean, nobody is going to kidnap your car. No-one can move her unless they're the Incredible Hulk or something. Now come on," he said, opening the door.
Dean ran his hand over the steering wheel. "I'll be back soon, baby. Don't miss me too much, okay?" He was silent for a minute, then he smiled. "You will? Awesome." He jumped when Sam banged on the window. "I'm coming, I'm coming." Dean got out of the car, and locked her up. "Are you happy now?"
"Have you finished being dramatic now?" Sam asked back. "You do know the car is not a person and can't talk, right?"
Dean glared at his brother as he got the empty gas can out of the boot to be filled up. "She may be a car, but she's family," he defended himself. "And by the way, she can talk. You have to listen to her engine to know what mood she's in."
"Oh my god." Sam shook his head, and started walking away, muttering about how weird his brother was.
"What?" Dean ran his hand over the roof, before following after his brother. "Hey Bitch, wait up." He caught up to Sam, but looked behind him, reluctant to leave his car behind.
"The car will be okay. Will you quit worrying?" Sam put his hand on Dean's shoulder, and turned him around.
Dean shrugged Sam's hand off. "Just wait until you have to leave your baby behind, and see how you feel."
"Dean, will you-" Sam took a deep breath. "Nevermind. Telling you not to worry about the car will be like me telling you not to be sarcastic... It'll never happen."
"I'm not that sarcastic." He saw Sam looking at him with raised eyebrows. "Okay, maybe a little... But only the normal amount."
"Do you really think she'll be alright?" asked the older Winchester, worriedly biting his lip.
"Dean, will you calm down? The car will be fine, do you think I'll walk away if there was any danger of someone breaking in? We've left all our stuff in there. And I don't know about you, but I don't fancy going around naked when we need to wash the clothes we've got on."
"Yeah. I'll only do that once. Never again." Dean shivered as he remembered the time his bag had been stolen, and he had to wash his clothes wrapped up in only the bed covers.
Sam smiled at the memory. "Besides, we haven't seen anybody for miles, and the car doesn't work anyway. So just chill out, okay?"
Dean took a deep breath, and nodded. "Okay. Sorry about that."
"It's okay. I'm used to it."
Dean smiled back, but stopped and winced when he felt a sudden pain in his back.
Sam noticed the wince, and put his hand on Dean's arm. "Are you alright?"
Dean's breathing hitched, and he fell to his knees. "Ow. Sonofabitch," he whispered, dropping the gas can.
"Dean?" asked Sam in a panic, going down with his brother. "Dean, hey. What's wrong?"
"Ahhh. My... b-back. Sonofabitch, it hurts." Dean's face scrunched up in pain, and he fell against Sam.
Sam caught his brother, and held him in his arms. He used his free hand, and placed it against Dean's back. "Oh... oh my god," he whispered in horror when he pulled his hand away, and he saw the blood covering his palm.
"Dean, it's okay. I'm getting help." With his free hand, Sam pulled out his phone to dial 911.
Dean laid his head weakly against Sam's shoulder, and groaned in pain.
"Help. I need help. M-My brother's hurt," Sam said into the phone, holding his brother tighter. "I.. I don't know, he's bleeding. Just hurry... please."
Sam told the operator where they were, and turned back to Dean. He took his over-shirt off, and held it against Dean's back to stop the bleeding.
"Help is on the way. Stay with me, Dean," Sam told him, holding his big brother close. "Hold on."
Dean moaned in response as he fought against the pain.
Hope you like.