This idea came to me upon discovering the song "Little Monster" by Royal Blood. AU in which everything is the same but Gabe didn't really die (as it should be!) and joined back up with the brothers within a few months. It's a little dark and not the happiest of endings. Dub-con (due to a spell), language, and sexual content. Very little plot with a little angst and a lot of smut.
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Hey little monster, I've got my eye on you
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As soon as they had entered the abandoned factory Gabriel knew they had fallen into a trap. Door slamming behind them, angel sigils adorning the walls bearing down and binding his power. "Gabe-" had been torn from Sam's lips as he disappeared in a clap of whispered thunder, and the group of witches showed themselves. That's right, it was a whole freakin' coven.
Now, Gabriel might have been cut off from his powers; but he was still millennia older, and made quick work of the witches and their weapons. But he hadn't made it through them without being hurt. And he wasn't healing.
Gabriel clutched his Archangel blade tight to his chest, and tried to blink away the rivets of blood seeping from his forehead.
Where the hell are you, Sammy.
It wasn't supposed to go down like this. A routine witch hunt; Dean had told them, happily delegating the job over while he and Castiel were to go follow up some recent demonic activity a few states over. Sam and Gabriel had readily accepted – Sam knew how much Dean hated dealing with witches, and Gabriel was just happy to spend time alone with the youngest Winchester – and there was never any reason to believe they would be in any real danger. Half the team was an Archangel for fuck's sake.
A scream pierced the air, and Gabriel took off running before he had even thought to turn.
He lunged through open passageways and ripped through locked doors; until he finally came across the Hunter spread-eagled on the floor with a witch looming above him.
With a snarl and the rage of heaven in his eyes, the Archangel tore across the room and buried his blade to the hilt in the witches back.
Dropping to his knees he scrambled over to the human and began to undo his bonds.
"Sammy? Sammich are you okay?" he practically shouted.
"Gabe…" The hunter's gentle hands reached up to clasp the face above him. "Shut the fuck up man."
Gabriel let out a breathy laugh, and restrained himself from embracing the taller male. "Alright Sasquatch. Get up. I really want to get the hell out of here and there's no way I can lug your sorry ass the whole way."
Sam slowing pulled himself to his feet. "Don't know what that bitch did, but I've got one hell of a headache going on."
"I know, Kiddo. Just let's get out of here and I snap us back to the hotel and heal you right up." (And myself, he thought with a grumble.)
They had barely made it back into the sunlight when Sam's eyes rolled back into his head and he collapsed in the Archangel's arms.