It's fairly common. Fans often look for more content related to their favorite shows. Since 'Attack on Titan' has a large and passionate fan base, there are a lot of fanfics available. 'Aot' fans might watch (read) these fanfics to explore different scenarios that the official story didn't cover. For example, they might want to see how a certain character would react in a different situation or what would happen if a major plot event had a different outcome.
I'm not entirely sure specifically about '50 shades of ereri fanfic' as it could vary greatly. 'EreRi' might refer to a pairing in a particular fandom. It could potentially be a fan - created story that takes inspiration from the '50 Shades' style in terms of exploring relationships, but with characters from the relevant 'EreRi' universe.
One interesting aspect could be the exploration of the relationship between the 'ereri' characters. If it follows the '50 Shades' inspiration, there might be a deep dive into their emotional connection and how it develops over time.
One interesting aspect could be the exploration of unique character dynamics. In ereri fanfiction, the relationship between the characters can be developed in ways that are different from the original source material. It might also show different interpretations of the characters' personalities. For example, how they interact in various situations, like facing challenges together or having deep emotional conversations.
One common theme is redemption. Eren might travel back in time to right his past wrongs. For example, he could try to prevent certain battles or tragedies that he feels responsible for.
There could be various fanfictions. Maybe some that focus on alternative endings, like ones where certain characters survive who didn't in the original. For example, a fanfiction where Erwin survives and leads the Scouts in a different way.
It could mean that a person who is a fan of 'Attack on Titan' (AOT) is reading or watching fan - created fictional works related to AOT. Maybe they are interested in seeing different interpretations or storylines that fans have come up with.
One way is to check on popular fanfiction websites. Look for ones with high ratings and a lot of reviews. For example, Archive of Our Own (AO3) has a large collection of AOT fanfictions. You can search for the most popular ones there.
He would probably be quite amused by some of his past antics. For example, his constant pranks on Iruka-sensei. But at the same time, he'd also see the pain he carried from not having his parents and realize how that influenced his actions. He might react with a bit of regret for some of the stupid things he did out of loneliness, but also be glad that those experiences made him who he is today.