Thorki

Takes place between many of the Marvel movies that contain Thor and Loki. The first chapter is after the first Thor movie, leading up to the first Avengers movie. So on and so forth.

What would happen if Loki didn't go along with Thanos' plan? What if the very Mindstone that was in Loki's scepter was also used on him? What if Thanos broke him and then put him back together as he pleased?
Also, what if Thor and Loki had a deeper connection? What if they were linked in a way? What if they cared for each other but didn't know how to tell the other?