Well, they might start to see Loki in a different light. They could become more sympathetic towards him. Maybe Thor would be extra protective, and the other Avengers might question their previous judgments of Loki.
Well, Thor would likely be deeply pained and determined to make it up to Loki. Natasha would be very observant and start to analyze Loki's behavior in a new way. Bruce might be a bit hesitant at first but then try to offer his help in a gentle way. They all would have different reactions based on their own personalities and experiences.
Searching for fanfics can be a bit of a trial - and - error process. Just because the title contains those elements doesn't mean it's easy to locate. You might have to expand your search terms a bit, like looking for fanfics that involve Loki, Thor, and Laufey in some sort of conflict or difficult situation.
One common theme could be redemption. After experiencing abuse, Loki might be on a journey to redeem himself or find a way to heal. Another theme could be power dynamics. The abuse might be related to power imbalances between Loki and Thor, which can be explored in different ways. And also, the theme of forgiveness could play a role, either Loki seeking forgiveness from Thor or vice versa.
It could be one of his close friends. In many fanfics, friends often play a crucial role in uncovering such secrets. They might notice Percy's unusual behavior, like being overly jumpy or withdrawn, and start to suspect something was wrong.
They might be shocked at first. They could feel a sense of guilt for not noticing earlier. Maybe they immediately try to comfort Percy and offer their support, like giving him a safe place to stay and assuring him that he's not alone anymore.
One possible plot could be that Laufey, Loki's biological father, decides to use Loki against Thor. He might abuse Loki in some way, either physically or emotionally, to make Loki do his bidding, which could involve causing trouble for Thor. Loki, being in a difficult position, has to deal with his complex feelings for Thor while also trying to escape Laufey's control.
Well, the concept of an 'abused' scenario in a Loki x Thor fanfic can be a tricky one in terms of ethics. On one hand, fanfic is a form of creative expression. But if it involves extreme abuse that is not in line with the general spirit of the characters, it might make some readers uncomfortable. It really depends on how it's written. If it's used as a way to explore complex emotions and character development in a nuanced way, it could be considered acceptable within the fanfic community.