requested by @lookin_at_beauty_14, Dean gets the stomach flu with a high fever, gets better, but passes it on to Sam who gets it even worse, mix in all the possible symptoms of the stomach flu and some loving/caring big brother, and you get this... Hope you enjoy!
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Dean lay curled up in a miserable ball on the bathroom floor. He felt like he had been there for hours, in reality only twenty minutes had gone by. He shivered hard, signalling that a fever had joined his upset and now empty stomach.

Sam silently watched his brother suffer, debating on how to help. Finally making up his mind, he got up and grabbed one of the grungy comforters off their beds. He walked into the bathroom and wrapped the blanket around Dean's shivering form.

"Here," Sam said softly, grabbing a clean washcloth, wetting it with cold water, and placed it on Dean's forehead.

Dean jumped each time Sam touched him, but sighed in relief at the coolness against his burning forehead.

"Have you taken any Tylenol?" Sam asked worried. Dean groaned, thinking here comes mother hen Sammy. 

"No, it wouldn't stay down." Dean pointed out weakly. He slowly pushed himself up and rested his elbows on the open toilet seat, as his stomach started churning again. 

Sam sighed, reaching over and grabbing the washcloth that had fallen when Dean sat up. He re-wet it the washcloth, putting it on Dean's neck this time hoping to calm the raging inferno in his brother. 

Dean groaned softly, "Thanks Sammy." he breathed weakly. He gagged hard, his stomach heaving harshly. He dry heaved for a good number of minutes, bringing up nothing but a bit of bile. 

Sam knelt down beside Dean, rubbing circles on his brother's trembling back. 

"Easy Dean. Breathe slowly, it will help." Sam suggested gently, feeling really bad for Dean. 

Dean took a calming breath, his stomach relaxing quickly. "Thanks," he slurred in a raspy voice. 

"Wanna stay here, or go lay down?" Sam offered gently, hoping sleep might help Dean feel better. 

Dean waited quietly for a moment, seeing if his stomach was going to cooperate or not. 

"Bed please." he whispered towards Sam. Sam nodded, standing up and offering his hand to Dean. 

Dean grabbed Sam's hand shakily, slowly pulling himself upright. He winced slightly, moving over to brush his teeth, before taking a couple sips of water. He moved slowly to his bed, collapsing on to it tiredly. 

Sam grabbed a couple Tylenol, and a glass of water, which he brought to Dean and offered them. "Please drink slowly and sip on it." he instructed softly. 

Dean looked at Sam blurry, taking the Tylenol and popped them in his mouth. He gagged softly, before dry swallowing them. He took a sip of the water, gagging softly again. 

"Are you gonna be sick?" Sam asked gently, quickly making a note of where the closest garbage can was. 

Dean shook his head, dozing off almost instantly. 

Sam sighed, walking over to grab a trash can. He put it down on the floor beside Dean's side of the bed, just in case. He moved over and sat down on his own bed, with a yawn. 

He looked at the clock, sighing seeing it was just after 3:15 a.m. So early, feeling exhausted, he lay down hoping Dean would sleep. 

Dean slept soundly until 7 a.m., before he sat up quickly and bolted to the bathroom. He dropped down to his knees in front of the toilet, gagging up the water and tylenol. 

Sam opened his eyes tiredly, getting up and walking to the bathroom.

"You okay?" Sam asked, with a yawn. 

Dean groaned, dry heaving harshly. He flipped Sam the bird, before burying his head in the toilet as he retched. 

Sam grabbed another washcloth, wetting it, and placing it on Dean's neck lightly. He hissed softly, feeling the amount of heat radiating off Dean. 

He walked into their room, looking for the first aid kit. He found it quickly, and rummaged around in the kit until he found the thermometer. He walked back into the bathroom, relieved to see Dean was leaning against the tub tiredly.

"I need to take your temperature." Sam said softly, seeing that Dean was nodding off. 

Dean sighed softly, nodding as he slowly sat up straighter. "M fine." he slurred tiredly.

"Dean, please." Sam pleaded gently. He offered the thermometer to Dean, seeing he looked a bit better. 

Dean put it in his mouth, glaring up at Sam without any real heat behind the glare. The thermometer beeped, the display read 102.1. He groaned softly, getting up and walking back to his bed. He collapsed on the bed, curling up, and falling instantly asleep. When he woke up again, he was surprised to find that he felt much better.

He got up and went to the bathroom, after taking care of his business, he took his temperature. The display read 99.1, and he sighed in relief. 

He walked back out into the bedroom, grabbing more Tylenol and swallowing it quickly. He walked over to the kitchen area, to find some coffee and donuts on the counter. "Sam?" he called with a raspy voice. There was no answer, as he walked around their room. 

He grabbed the coffee and walked outside, seeing the impala was still outside. Hmm... where could Sam have gotten off too?

He sipped on the coffee, as he walked over to his bed and sat down. He put the coffee down on the nightstand beside his bed, feeling really drowsy again. He curled up on his bed, watching the door quietly, dozing off and falling asleep. 

Sam walked back in the door an hour or two later, arms laden down with plastic bags of food and sickness supplies. He looked over and smiled when he saw that Dean had gotten the coffee, but had fallen asleep again. 

He put the food stuff away, as he felt his lower stomach grumble in discomfort. He shrugged it off, thinking nothing of it, as he walked towards his bed. His lower stomach grumbled loudly, sending a sharp pain through his stomach. 

Sighing, he walked to the bathroom quickly. He was hoping that he wouldn't get hit by this stomach bug, but it looked like he wasn't so lucky. He had barely gotten into the bathroom, as he gotten the feeling that something bad was about to happen. He quickly shut the door, pulled his pants down, and sat down. No sooner was he seated, then his bowels surged emptying quickly and harshly. 

He wrapped his arms tightly around his stomach, panting softly at the churning in his stomach. His stomach was churning violently, as his bowels couldn't to empty. He shivered hard, his body covered in goosebumps as he tried to breathe calmly. 

Dean sat up slowly, noticing immediately that Sam was home. "Sam?" he called, hearing his brother groan from the bathroom. "You okay?" he asked, getting up and rushing to the bathroom door. 

"Not feeling so hot..." Sam admitted, feeling really nauseous. He groaned again, as his bowels evacuated more and left him panting and shivering even more. 

Dean opened the bathroom door slowly, grimacing at the smell that assaulted him. "That bad, Sammy?" he asked sympathetically. He moved slowly into the bathroom, relieved his stomach wasn't reacting to the smell. 

Sam whimpered softly, as he felt his body trying to purge. "Think i'm gonna be sick." he whispered, hoping deep down that he was wrong. 

Dean grabbed the trash can sitting beside the toilet, offering it to Sam. He could see how pale his little brother was, and how miserable he appeared to be. "Its okay, don't fight it. If you are going to be sick, it might help you feel better." he said kindly. 

Sam whimpered as his bowels emptied again, gagging softly under his breath. "I don't want to..." he admitted softly, not wanting to throw up at all. He waited a moment, as the nauseous feeling went away, as did the feeling that he needed to purge. "I think its okay, the feeling went away." he said in relief. 

Dean nodded slowly, putting the trash can back beside the toilet. He grabbed the thermometer, rinsed it off, and offered it to Sam. "Just to be on the safe side." he reasoned, knowing that healthy Sam would agree completely.

Sam sighed, nodding slowly. He put the thermometer in his mouth, gagging softly as it hit his tongue wrong. Once it beeped, he pulled it out of his mouth, flinching as he read the display: 101.6. He sighed as he passed it back to Dean, with a quiet look of resignation. 

"Yep, you definitely have a fever. Let's get you in bed, and resting." Dean said, looking away as Sam wiped and pulled up his pants. The younger hunter winced, as his stomach cramped up as he stood up again. 

"Ow... Sonuva..." Sam grumbled softly, trying to not show how miserable he felt. 

"Sammy? What hurts?" Dean asked, looking at Sam's face in concern. He looked over Sam carefully, worried about what could be hurting that much. 

"My stomach is cramping." Sam gasped out, jerking his pants back down and sitting down quickly. His bowels cramped tightly, evacuating aggressively. He huffed and puffed weakly, grabbing the garbage can too and put it in his lap. He gagged harshly, throwing up his coffee and donuts. 

"Aww... Sammy, its okay. Let it out." Dean said sympathetically, as he rubbed circles on his brother's back. He held his little brother tightly, feeling him shaking with the force that his body was trying to empty. 

"Hurts..." Sam slurred weakly, throwing up over and over again, as his bowels fought to evacuate too. 

Dean sighed gently, humming Metallica softly. "Breathe through it, Sammy." he said gently, rubbing gentle circles on Sam's back. 

Sam stopped throwing up finally, but his bowels didn't stop trying to evacuate. He put the trash can down on the floor, as he doubled over and wrapped his arms tightly around his stomach. 

Dean carded his fingers through Sam's sweaty hair, wishing he could have kept Sam from feeling this. "How you doing, buddy?" he asked kindly, as he looked down at his sick little brother. 

"C...cold..." Sam stammered, as the fever in his system made him freezing cold. 

Dean sighed softly, reaching over and turning the shower on. "How about a warm shower?" he offered, knowing Sam rarely rejected anything involving warm water. 

Sam nodded slowly, knowing the warm water might help his muscles relax a bit. He cleaned himself up and stood up slowly, too sick to care that his big brother was getting a full frontal view of him. He pulled his shirt off, before staggering into the shower. 

He sat down in the tub, letting the warm water cascade down his shoulders. He had been right, the warm water did loosen his muscles, maybe a little too much. He gagged, retching harshly onto the floor in front of him. He lurched forward, vomiting hard over and over. 

Dean turned the water to a bit warmer, as he rubbed Sam's back lightly. "Its okay, buddy. Easy, easy. just try to breathe." he said over and over again, wincing with each heave coming from his brother. 

Sam took a brief deep breath, only to lurch forward again. He got on his hands and knees, as he heaved in the shower. He didn't have time to feel embarrassed, as he couldn't stop dry heaving and vomiting. When he finally stopped and was able to take a breath, he almost collapsed from shaking too hard. 

Dean turned the water off and grabbed Sam at the same time, making sure he didn't fall face first into his puke or the tub. "Hang on Sammy." he said gently. He grabbed a towel, which he wrapped around his brother protectively. He helped Sam up and out of the tub, sitting him on the toilet, so he could find clothes for his brother. 

Sam pulled the towel tight, shivering hard as the fever raged in his body. He whimpered softly as his stomach cramped again, evacuating his bowels with very little warning. 

Dean walked in, with sweats and a t-shirt. "Aw... Sammy. Its okay, let it out so you can rest." he said, watching Sam shudder with each new evacuation. 

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Once Sam was done, Dean got him dressed and into bed, hoping his little brother would sleep and get better. Dean was fine and dandy, and Sam was sick for most of the next day.