SPOILERS FOR THOR: RAGNAROK!
This is just a little idea that wouldn't leave my mind after seeing Ragnarok. If we disregarded the post-credit scene, what would actually happen if the Asgardians got to Midgard?
EDIT: Well...this little idea turned into something quite long. To add a little more accurate summary, there is not only angst/hurt/comfort to be expected but also fluff and a lot of brotherly moments. In the meantime, Loki struggles to fulfill his full potential as a plan needs to be devised to defeat Thanos.
PROLOGUE
Many SHIELD agents were surrounding the spaceship. In front of them, Fury stood with Tony Stark, Steve, Clint and Natasha. The Avengers' faces lightened when they saw Banner and Thor emerging from the spaceship.
"My friends!" Thor yelled and grinned at his friends from work. Meanwhile, Banner was being crushed in a tight embrace by Steve. Fury, being himself, was observing everything from distance as if the Earth was facing yet another invasion.
Loki knew he had to get out of the spaceship. If he hesitated a bit more, they would think that he was hiding inside.
They would think him a coward.
He was Loki, the saviour of Asgard, for God's sake. He was not afraid of a few petty mortals.
Only that he was.
Loki knew that neither SHIELD nor anyone on Midgard would welcome him with open arms. Midgard surely held grudge against Loki and he couldn't say that unreasonably so. Frankly speaking, Loki was terrified of the idea of finding himself in some kind of dungeons again. His time in the Asgardian dungeons was terrible; Loki was suffocating and there was no one who would listen to him. Loki couldn't go through all of this again on Midgard.
Also, no matter how much Loki hated to admit it, he was happy that him and Thor have found some sort of truce. Loki did miss his big brother and felt safer by his side. He knew that he was lying to Thor and himself when he agreed that it would probably be better if they never saw each other again.
Loki needed Thor and he was relieved to see that Thor's indifference towards him was slowly melting away. Don't be mistaken – Loki would never go back to know your place, brother times. In the end, he meant it when he said that all he ever wanted was to be Thor's equal.
Yet Thor has matured a lot since those times and Loki knew that he himself has also made quite a few mistakes. If Thor was willing to give their lost brotherhood a chance, Loki was too.
However, Loki was afraid that when those mortals saw him, their most likely angry and violent reaction would remind Thor of all the reasons why Loki should not be trusted.
With a heavy heart but unreadable expression on his face, Loki stepped out of the spaceship.