And here comes the third tense: the future.
This story takes place in three different storylines in total, set in the past, the present, and the future.
I don't own the Avengers films - I haven't even seen them!
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Future
Loki groaned. He was trapped. Again, by those idiot Avengers, to add serious insult to injury, and this time, he had no escape plan, if he only managed to suffer through the humiliation of being in their custody. No, this time, he was done for. Shit.
Tony paced around the kitchen. This part again. At least, this time the Asgardians had bound all of the trickster's magic, and he really was caught in a trap. There was no doubt about that, thankfully. They had him, and judging by the expression in the god's eyes the last time he saw him, so very different from last time, he knew it too. That was a little bit reassuring. After listening to the ongoing argument for a good ten minutes, Tony Stark sat down at the kitchen table, and he made a list.
He wrote it, labelled it, put it up at the fridge door with a silly magnet in the form of an arc reactor (with the old core which would give its wearer palladium poisoning, but no one had told the fans that, apparently) and then he went to bed. Enough was enough.
The next morning, by the time everyone was in bed, the list looked a little different as each and every member of the team and of the Avengers had made their own contributions.
Five rules for Loki's inprisonment;
1: Loki is not to be tortured. (There is such a thing as the Geneva convention, people)
2: If Loki attempts an escape, it is his own fault if he gets hurt and violence is not only allowed, but encouraged.
3: Loki is not allowed to do anything to Pepper. If he does, we will lock him in the Green Room with the Hulk. (Sorry Bruce)
4: Above rule does not apply to Pepper doing things with/to Loki. She can do whatever she likes. Unless it directly violates human rights. See rule one. ("Come on, that's a useless rule. Pepper wouldn't!" "Probably not, but it never hurts to be clear")
5: If Loki insults anybody, he is not allowed tea. ("That's a ridicolous rule!" "Yes, Steve, but it'll probably work")