A fanfiction idea could be that Thor becomes overprotective of Loki when they are on a mission off - world. Loki is trying to use his skills to gather information but is in a dangerous area. Thor follows him closely, ready to fight off any threats. He might even go as far as to not let Loki out of his sight for a moment. This overprotectiveness could stem from Thor's love for his brother and his newfound understanding of Loki's importance in his life, as well as in the grand scheme of things in the Avengers universe.
The theme of family loyalty often shows up. Thor feels it's his duty to protect Loki because they are family. Also, the power dynamics in Asgard can be a theme. Thor's overprotectiveness can be influenced by his position of power and his need to keep Loki, who is sometimes seen as a bit of a wild card, in check.
One great Thor overprotective of Loki fanfiction is 'The Bond Between Brothers'. It really delves into Thor's instinct to protect Loki, especially during their adventures in Asgard. The author does a wonderful job of showing Thor's internal struggle between his duties as a prince and his love for his brother.
One common theme is redemption. Thor's overprotectiveness can be seen as a way to help Loki redeem himself in the eyes of the Avengers. For example, he might shield Loki from criticism so that Loki can focus on proving himself good. Another theme is family. Thor's actions show that he values Loki as family despite their past differences. It's like he's saying that family sticks together no matter what.
There's 'Thor's Redemption in Loki's Arms'. In this story, Thor realizes his true feelings for Loki after a series of events that nearly tear Asgard apart. It's a tale full of emotion and character development.
I really like 'A Different Path for Loki'. In this fanfiction, Loki is given a chance to redeem himself in a unique way. It's full of interesting plot twists and great dialogue between Thor and Loki. The author does a wonderful job of exploring Loki's psyche and his relationship with Thor against the backdrop of the Asgardian world.
If Loki survived in Infinity War fanfiction, it could have led to a very different outcome. He might have used his trickery to deceive Thanos in some way. Maybe he could have pretended to be on Thanos' side while actually working against him. This would have added an extra layer of intrigue to the story as the other characters would have been unsure of his true motives.
When Thor is mean to Loki in fanfiction, it can lead to a downward spiral in their relationship. Loki, feeling constantly attacked, may lash out in more extreme ways. Thor, on the other hand, may double down on his meanness, believing it's the only way to deal with Loki. This can create a cycle of animosity where any love or brotherly bond they had is overshadowed by anger and distrust. For example, Loki could start to form alliances with Thor's enemies out of spite, and Thor would see this as confirmation of Loki's untrustworthiness, making the relationship even worse.
Thor might initially go into denial. He can't believe that Loki is truly gone. He may hold Loki's body for a long time, as if waiting for him to come back to life. Then, he could become angry. Angry at the situation, at whoever or whatever caused Loki's death. Eventually, he may find solace in the memories of Loki. Remembering the good times they had together and using those memories to move forward.
These fanfictions typically show their relationship as something that has to be hidden from the rest of Asgard. It adds an element of secrecy and danger. The relationship is also often portrayed as a way for both characters to find solace in a world that doesn't always understand them. Loki's cunning and Thor's power are intertwined in a way that makes their connection unique and captivating.