No. Fanfiction should generally adhere to certain ethical and moral standards. Sexual content in fanfiction related to 'Assassination Classroom' is not acceptable. The fan community should promote positive, creative and respectful interpretations of the original work.
Koro - sensei would likely be one of the main characters. His unique abilities and his role as the target of assassination in the original 'assasination classroom' would also be important in the infinite loops scenario.
Well, another concept could be how the infinite loops impact the overall plot. It might create a sense of mystery as the characters try to figure out how to break the loops. Also, it could introduce new challenges for the assassins in terms of their mission to kill Koro - sensei, as the loops might change the rules or circumstances of the classroom.
I'm not sure. It might be a phrase related to something specific or a combination of words that's not common. Maybe it's from a particular context or language I'm not familiar with.
In Enzo Comics, the time to drink could vary. Maybe it's after a big victory or during a celebration. But it really depends on the story's development and the characters' situations.