Disclaimer: Supernatural, its plotlines, and its characters are all property of the CW and the show's writers. I probably wouldn't be worth only $7 and a bottle of pop if I was actually involved with the show, so it's really not worth the effort to sue me, even if I would love to actually meet Misha Collins.

Summary: Cas walks into the bunker to find Dean seizing on the floor of the library. He and Sam save him, but it affects Cas in a way that he has never experienced before. And he needs Dean to save him. Hurt/comfort, angst, family. Destiel, but nothing explicit. Rated T for language and some graphic content (Dean's seizure).

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I Need You

Chapter 1

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Cas opened the door of the bunker and walked in without knocking, turning around to latch it behind him. He hadn't been to see Sam and Dean in a while, and he was happy to finally have some time to spend with his two best friends – his family. He had even brought the boys some greasy diner food from a place down the road as an apology for being gone so long.

As he walked down the stairs and into the war room, he couldn't help but notice that the bunker was eerily silent. He couldn't hear the boys talking in the kitchen, or a distant thump of classic rock music coming from Dean's room, or even the clunk of a whiskey glass on a table or the sound of Sam's fingers flying over the keyboard on his laptop.

"Sam? Dean?" Cas called in the direction of the bedrooms. He knew the boys were there, the Impala was parked outside the bunker door. He was still unnerved, however.

Cas quickly made his way down the stairs and into the war room, glancing around just to make sure he hadn't missed anything. When he didn't see any trace of either of the Winchester boys, he made his way into the library, catching sight of something that made him scream – literally.

"DEAN!"

Dean was laying on his back on the library floor, in the midst of a pretty severe looking seizure. His eyes were rolled back in his head so Cas could only see the whites and he was practically foaming at the mouth and making a strange guttural choking noise, all while convulsing so hard that he was banging his head against the floor.

"SAM! SAM! COME QUICK!" Cas screamed as loud as his throat would allow. He flung the bag of greasy burgers he had brought to the side and dropped to his knees next to Dean. His first thought, of course, was to simply heal him with his touch, so he poked Dean's forehead lightly, only to realize that his borrowed grace, the stuff that was practically killing him from the inside out, was not strong enough to heal Dean from something like this. Trying desperately to think of something to help his friend, Cas quickly rolled Dean onto his side so he wouldn't choke, and as soon as he did a large amount of vomit splashed across the library floor. Digging up every single thing he had ever read about seizures, which he was sure this was, from the back of his mind, Cas shrugged his trenchcoat off his shoulders and balled it up, sliding it under Dean's head so he wouldn't end up with a concussion from banging his head against the floor.

Just then, Sam ran into the library at full speed. "Cas…OH MY GOD!" Sam ran to where Cas was kneeling next to Dean just as the older hunter went still. Too still. "OhmygodohmygodohmygodOHMYGOD!" Sam yelled, standing and pacing with his hands in his hair. Cas could tell Sam was freaking out, and he was going to have to take control to save Dean.

"Sam! SAM!" Cas got Sam's attention while he felt Dean's throat for a pulse. He breathed a sigh when he felt a weak, thready pulse beat under his fingertips. "We have to get Dean to the hospital. Call someone!" Cas yelled.

"W-we can't bring EMTs down here, Cas. We'll have to get him into the Impala and drive him." Sam was clearly panicking, running his hands through his hair and letting tears drip from his eyes.

"Then let's GO!" Cas grabbed a hold of Dean's shoulders and directed Sam to grab his feet, and they heaved his up the stairs and out to the car as quickly as the could. When they got outside, Sam dropped his brother's feet and opened the back door, helping Cas slide Dean the rest of the way in. He was still panicking.

Cas slid into the back seat and rested Dean's head on his lap, making sure his face was turned to he wouldn't choke if he vomited again. He had left his coat in the bunker where he had placed it under Dean's head, so he was left in his rumpled black suit and loose blue tie. He screamed at Sam to "DRIVE, DAMN IT!" as he felt for Dean's pulse again. It was weaker than it had been before, though he opted not to give that particular bit of information to Sam, worried that his brother's weakening pulse would send the younger hunter over the edge and cause him to do something reckless. Damn it, if only he still had his wings so he could transport Dean to the hospital instantly.

As Sam floored it and made the tired screech on the dirt road under them, Dean started to shake. Cas started to worry that he was going to seize again before he remembered that one of the aftereffects of seizures is extreme cold. Cursing himself for leaving his coat in the bunker, Cas took of his suit jacket and draped it over his friend, leaving his in just his shirt and tie. He slowly rubbed up and down Dean's arms to work some heat into him, praying to Chuck to please, please help Dean survive.

Cas caught himself wishing that he had just said something sooner, that he had just told the insufferable man laying on him that…but no. He didn't have the strength to think those things with Dean clinging to life so desperately. Even though the boys had died and come back to life countless times, Cas had a feeling that Dean wouldn't make it back from this one.

Cas bit back tears and continued rubbing Dean's arms, finally setting a hand on Dean's short hair and stroking his thumb across it and behind his ear. He hunched forward so his mouth was just above Dean's ear. "Please, don't leave me."

Just then, Sam whipped into the emergency room parking lot of the hospital about 20 miles from the bunker and hopped out. "WE NEED HELP! SOMEONE PLEASE! MY BROTHER, HE HAD A SEIZURE!" Nurses came streaming out of the emergency room as Sam opened the car door and Cas extracted himself out from under Dean's head. The nurses pushed them out of the way as they lifted Dean out of the car and onto the gurney they had brought, wheeling him through the automatic doors in a dead sprint.

Sam ran in after the nurses, only a few paces behind, desperate to make sure his older brother would be alright. Cas, on the other hand, couldn't bring himself to walk into the hospital and see them working on Dean. The thought of his strong, resilient best friend hooked up to a bunch of machines with a tub down his throat so he could breathe…Cas didn't think he could take even one look without breaking. And breaking down was the last thing he wanted to do in front of Sam, who needed him to be the strong one right now.

Cas slammed the back door of the Impala, which was still hanging open from when the nurses had grabbed Dean, and slide into the driver's seat. Sam hadn't exactly parked the car, he had barely put the car in park before he had jumped out and screamed for help. He hadn't even managed to turn the car off. So, trying to distract himself from the thought of his best friend possibly dying in the next few minutes, Cas threw the idling car into drive and pulled around to find a parking spot.

He found one not far from the entrance, so he pulled in and put the car in park. After sitting for a minute with his head in his hands, Cas built up the courage to at least sit in the waiting room of the ER. He turned the Impala off and slipped the key into the pocket of his dress pants, opening the door and neatly sliding off the driver's seat and onto the pavement. He made his way quietly through the automatic doors of the ER entrance, not caring that he had left his suit jacket in the car and probably looked just as disheveled and traumatized as he felt.