In this fanfiction, Loki might freeze Thor during a heated argument. Thor, not expecting such a betrayal from his brother, is frozen solid. Loki then takes control of Asgard, but quickly realizes he's in over his head. As he rules, the people of Asgard start to rebel. Meanwhile, Thor, in his frozen state, is slowly being affected by some dark magic. Loki, seeing the chaos he's caused and the danger to Thor, has to find a way to break the spell. He teams up with some unlikely allies like the dwarves who have knowledge of ice - breaking magic. Eventually, Loki manages to unfreeze Thor and they have to work together to restore peace in Asgard.
Well, perhaps Loki freezes Thor as part of a deal with an enemy. Thor is frozen and the enemy thinks they can now easily take over Asgard. But Loki has a hidden agenda. He freezes Thor not to harm him but to protect him from a more dangerous plot. Thor, while frozen, has visions or dreams that give him some new power or knowledge. When Loki finally unfreezes him, Thor is stronger and together they outwit the enemy and Loki's true loyalty is revealed to Thor, strengthening their bond.
In this fanfiction, perhaps Thor hits Loki with Mjolnir as a form of punishment for one of Loki's many tricks. Maybe Loki has double - crossed Thor in a plan to take over Asgard, and Thor's only option to stop him is to use his powerful hammer.
It could be that the marriage is part of a bigger plan to save the universe. The gods or some powerful entities have foreseen that only the union of Loki and Jane can bring about a certain balance. But Loki and Jane are initially unaware of this and have to figure it out as they navigate their new married life.
Well, a plot twist might be that Loki and Sif's marriage is part of a grander scheme by Odin. He wants to unite two powerful families in Asgard to face an upcoming threat. However, Loki and Sif don't know this at first. As they start their married life, they face many challenges together, like dealing with jealous courtiers. But as they uncover the truth about Odin's plan, they decide to embrace their roles and lead Asgard to safety.
A plot development could be Loki forming an alliance with the Jotuns against a common enemy. This enemy could be a threat to both Jotunheim and Asgard. Loki, being in Jotunheim, has the opportunity to broker this alliance, which would surprise Thor and the other Asgardians when they find out.
Another plot twist could be that an ancient Asgardian law is revealed which states that Thor, as a prince, can't marry a mortal. This would lead to a lot of internal conflict for Thor, as he has to choose between his love for Jane and his duties to Asgard. Jane, on the other hand, might try to find a way to prove herself worthy or to change the law.
It could be a very emotional reunion. Thor might be initially angry at Loki for all his past misdeeds but then quickly soften as he realizes how much he has missed his brother. Loki, on the other hand, might be a bit guarded at first, still not fully trusting Thor's reaction. But eventually, they would embrace and start to rebuild their relationship.
In the fanfiction, Thor could be a key factor in Loki's development within the TVA. Since Thor has always had a strong influence on Loki, his presence might make Loki question his actions and motives even more deeply. For example, Thor could remind Loki of their past, both the good and the bad times, which could lead Loki to make different choices within the TVA's framework.
The other Asgardians would be in shock. Heimdall, for instance, would immediately sense that something was wrong with Thor. He might try to find a way to break the spell himself or inform the other powerful Asgardians. Odin would be furious with Loki and demand that he unfreeze Thor. The Warriors Three - Fandral, Hogun, and Volstagg - would likely want to take immediate action against Loki. They might try to fight him to force him to reverse the spell.
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.
One possible plotline could be that Loki meets a girl in a different realm. Maybe she's a powerful sorceress who initially challenges him. As they cross paths more often, they start to see each other's true selves. Loki, who is used to being alone and distrusted, slowly opens up to her. Their relationship could be filled with banter and magical adventures as they face threats to their realms together.