Author's Note: Another serious piece... I haven't written anything for the challenge in three weeks, so this is a cumulative triple-drabble with the recent prompts. I'm only halfway through the series, so I don't know the specifics of Grace, and Purgatory, and magic portals. Sorry for any inaccuracies.
Disclaimer: Writing is the only way I own them
Prompts: Rainbow, hover, scorch
Words: 364
...
Blue eyes glistened in the rearview mirror as the immortal angel fearfully watched the middle-aged hunter bleed out in the backseat. Sam, crimson-soaked and ghostly white, hovered on the brink of death, his hands instinctually pressed against the hole in his side. Blood dripped slowly between his clenched fingers onto the aged leather. Castiel white-knuckled the steering wheel anxiously.
He and the Winchesters were brothers in the strongest sense of the word, living and laying down their lives for one another. They had been through too much, facing Heaven and Hell, innumerable creatures and apocalypses, even God himself. That bond only deepened when the humanized angel had decided to take on the burden of hunter and fight beside them. But this time, the trial proved too strong.
Expending the last of his Grace to keep the countless monsters at bay, Cas hadn't been able to stop the splitting open of Dean's chest when he jumped in front of his brother. He lay in the mud, breathing ragged, delirious with pain, Sam collapsed and half-awake by his side. His fist gripped at the faded jacket tightly and pulled his friend close, words barely audible. And he made him promise. Made him promise to save Sammy and himself and get the hell out of there. Then his determined hold grew slack and his eyes dimmed. He was gone.
With no time to mourn, Castiel rushed to Sam's side and hauled him to the classic car, tires screeching as they sped from the impending blast. The portal shrunk in on itself and expanded, obliterating everything behind the Impala in a white flash. Scorched earth and soft rainbow-hued lights dissolving into the twilight were all that remained of Purgatory.
The fading hunter mumbled something incoherent and Castiel pushed the vehicle to its limit. But no matter how fast he drove, Sam slipped faster. For the first time in his existence, Cas allowed the unbidden tears, fat and heavy, to spill down his cheeks. He wept for all the friends he lost and the vow he couldn't keep.
Solitary and eternal, just like the Impala, he knew he would go on.