Just came to me during church (yeah, I know, horrible place to be Avengers brainstorming), and got jotted down once we were back home. Enjoy!
Loki wasn't going to admit it – not now, not ever – but he'd actually taken a bit of a shine to his new "ally," Agent Barton. He was an interesting man, for a mortal – sharp, disciplined, skilled, and still witty in the same sarcastic way that Loki himself favored. Had the timing of their meeting been much more fortunate, Loki could see himself wanting to become true friends with Hawkeye. Maybe the smallest part of him even wanted that anyway.
As it was, Loki was currently sitting alone in his cell, listening keenly to the ever-growing amount of chaos going on outside the containment room as he waited for one of his newly-acquired goons to come release him from his cell. Dare he hope it would be Barton himself? No, not likely, since Loki had practically made him second in command of his mission.
And, just as he had predicted, it was not Barton coming through the doors to free him. Oh well, at least he was free.
Then Thor had to come along and ruin it – or just make it more fun, as it turned out, since Loki got to trap the demigod in the prison he had just walked out of. When Agent Coulson came in waving that gargantuan gun, that's when things truly started going downhill.
Loki's hands were already raised as he warily watched the agent when he suddenly felt a slip of the magic in his mind, like a chord being cut. Someone, somewhere on this flying fortress, had just managed to "recalibrate" one of those he had taken into his mental control. Feeling around the subconscious of his magic, Loki realized with a sudden pang of – what exactly? – that it was Barton.
Someone had just taken away the closest thing to a friend that Loki had found on Midgard. Well, that just wouldn't do. Maybe he would just take away someone that SHIELD wanted to keep around.
In a sudden fit of anger, Loki teleported himself to stand directly behind Agent Coulson, stabbing the man from behind with the knife-shaped end of his staff. Thor screamed, and Loki almost smiled.
That was better. The Avengers had just lost their favorite agent – just like Loki had just lost his Hawkeye. After all, all was fair in love and war when it came to those you considered friends, right?