One plot idea could be Oliver and Sara teaming up on a dangerous mission in a new, uncharted territory. They face various challenges and in the process, their relationship deepens. Another could be a story where they have to protect a mysterious artifact that has some sort of connection to their pasts. Maybe there's a villain who also wants the artifact and they have to outwit him.
To develop Oliver further, he could be shown struggling with new moral dilemmas. For example, in a situation where saving one person means sacrificing many others. Sara, on the other hand, could be developed by exploring her past traumas more deeply. Maybe she has nightmares about her time with the League of Assassins that start to affect her current actions.
Well, I've come across some. One interesting one had a storyline where they were pregnant in an alternate universe where the Arrowverse had some really different events. It was really creative how the author incorporated the pregnancy into the already established characters' personalities and the overall story arc of the Arrowverse. Another one focused more on the emotional journey of Sara and Oliver dealing with the pregnancy in a world full of danger and secrets.
One possible plot could be that they discover the pregnancy during a mission. They then have to keep it a secret from their enemies while also preparing for the new life. Oliver might be overprotective, and Sara could be struggling with how motherhood will change her life as a warrior.
The main characters are Naruto from the Naruto series and Sara Lance from, perhaps, the Arrowverse. Naruto is a ninja with strong willpower and amazing powers like the Rasengan. Sara Lance is a skilled fighter, often associated with her acrobatic combat skills and her use of weapons.
One common theme is her recovery process. Writers often explore how she deals with the physical and emotional pain. Another theme could be the reaction of her friends and family when she's hurt. For example, how Oliver Queen might react.
One great Sara Lance x Reader fanfiction is 'A New Beginning'. It beautifully portrays the relationship between the two. The story has a lot of emotional depth as it shows how the reader character and Sara meet in a difficult situation and gradually grow closer. The author does an amazing job of writing Sara's character, staying true to her strong and complex personality from the shows.
I'm not aware of any highly rated Barry Allen x Oliver Queen lemon fanfiction because I avoid promoting or seeking out such content. However, you can check fanfiction review sites or forums where readers discuss and rate different stories. Just be cautious as lemon fanfiction may not be suitable for all audiences.