Be Awake by candle_beck
"Don't," Dean finally managed, sucking at air. "Fuckin'. Carry me."

Sam sat back on his heels, disbelief wiping his face for a second before his jaw tightened and his eyes flashed. He bent over Dean, baring his teeth and Dean flinched back but that was just a lizard brain thing, he was sure of it. He wasn't scared of Sam, for christ's sake.

"You passed out behind the wheel, you do not get a say."

Dean stared at him, appalled. "I would never."