I don't own Supernatural. If I did then Destiel would be 100% canon. Proceed.
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Dammit Cas
Dean wiped off the blood from his blade, placing it back in his pocket before turning around. Castiel was standing behind him, hovering over a demon's dead body and looking slightly shaky, probably from exhaustion. Dean smiled slightly and started walking over to the trench coat-wearing brunet. "Great job a while ago, Cas. I probably would've died if you weren't there to save my a-" He was suddenly interrupted when the angel lurched forward and would've fallen face-first onto the ground had Dean not caught him. The hunter's eyes widened and he wrapped his arms around the angel, stumbling from the extra weight. "Cas! Cas? You alright? Hey speak to me!" Castiel didn't answer, and Dean frowned deeply as he lifted Castiel up bridal style, quickly heading out the door and over to his car. He'd call Sam later to clean up the mess. Once Cas was safe.
He drove as fast as he could over to the motel they'd been staying at for the past few days, sending worried glances to Cas, who was still passed out and curled up on the passenger seat, every few seconds, cursing under his breath about stupid speed limits. When they finally reached the motel, he quickly parked the car and got out, going to the passenger side and carefully lifting Castiel up in his arms and into the motel room. Once inside, he gently placed the angel on his bed and sat down on the edge, frowning down at the unconscious man.
"Cas? Wake up. You're scaring me man," Cas groaned quietly and turned onto his side, curling up on the bed, and Dean wasn't sure if he was supposed to be relieved or worried still. "Cas? You gotta tell me if you're alright before you sleep." He said, gently shaking the angel on the shoulder.
"'M fine. Lemme rest," mumbled the angel, turning away from Dean and nuzzling into the pillow. Dean sighed in relief and stood, running a hand through his hair.
"Dammit Cas you scared the crap out of me. Don't ever do anything like that again, you hear me? At least warn me before you pass out! I thought you were dead for crying out lou-" Once again, Dean was interrupted by Cas, except instead of passing out, Cas was snoring. Not loudly. Just loud enough to barely be heard. For some reason that made Dean smile fondly down at the angel, which made him let out an exasperated sigh. "Dammit Cas. Falling asleep before I'm even done talking. Hasn't anyone ever taught you some manners?" He grumbled good-naturedly to himself, sitting back down and taking the brunet's shoes off and slipping the covers up to the angel's chin. Unconsciously, Cas moved closer to Dean, curling up even more on the bed and burying his face in the pillow Dean had been using. The green-eyed hunter couldn't help but smile wider at how innocent and even more childlike Cas seemed in his sleep, and he couldn't stop himself from leaning down and placing a kiss on Cas' cheek. "Sweet dreams Cas," he murmured softly before standing up, turning around and taking his phone out to call Sam. Behind him, Castiel's lips turned up into a small smile, inwardly congratulating himself for a successful mission.