In the context of the novel, 'my world bloom for you' might imply a deep emotional connection. It could be that the character's inner self, which was perhaps dull or unfulfilled before, starts to thrive and show all its best aspects due to the presence or influence of 'you'. For example, it could be a story of a person who was lonely and then met someone who made their whole world seem like a beautiful garden in full bloom.
Molly Bloom is the central figure in this true story. Without more context, we can assume she is an individual with a story worth telling, perhaps someone who overcame difficulties or had a remarkable life.
Well, 'OP' in the context of this 'Fury Tries to Kidnap OP Harry Potter Fanfiction' could be the main character that Fury is targeting because of their special powers. Maybe it's a new character created by the author with unique magical abilities that Fury, for some reason, wants to get his hands on. It could be someone with a combination of different magical skills from the original Harry Potter universe, like being able to perform extremely powerful spells without a wand or having the ability to control all types of magical creatures.
Sky might also be a savior. He has a strong connection with Bloom and would be enraged to find out she's been kidnapped. He could use his combat skills and swordsmanship to fight Brick and rescue Bloom. Another possibility is that Tecna, with her technological skills, could track down Bloom's location and help in the rescue operation.
Friendship also plays a role. Some fanfictions show how the friendships in the story are affected by the romantic relationships or how they help the characters grow. For example, side characters' friendships can either support or create challenges for the main characters' love story. Additionally, the theme of acceptance, both of oneself and of others, is often present. The characters may struggle with accepting their own feelings or the feelings of those around them, which is a key part of many 'bloom into you fanfiction' stories.