One idea could be that they are on a dangerous mission together. In the heat of the moment, as they narrowly escape a trap, their adrenaline is high and they share a passionate kiss. It's a spontaneous expression of their unspoken feelings that have been building up during all their adventures.
Perhaps a plot where Tara and Eliot have to go undercover while she's pregnant. They have to hide her pregnancy from the targets, which creates all kinds of comical and tense situations. Or a story where the pregnancy makes them re - evaluate their own lives and their future in the team. Maybe they start thinking about settling down a bit more, which causes some friction as well as some heartwarming moments within the team.
You can start by writing a short prologue about their relationship up to that point. What kind of adventures have they had together? How have their feelings for each other been evolving? Then, introduce the event that will trigger the kiss. It could be a revelation about one of their pasts that makes the other see them in a new light and leads to the kiss.
You could also focus on a side character's perspective. For instance, a friend of the main characters who has always secretly liked one of them. This character could try to interfere with the relationship in 'it started with a kiss' in the fanfiction, creating a lot of drama and tension in the story.
One idea could be a forbidden love story where a human falls in love with a succubus. The succubus is initially only interested in his energy but gradually develops real feelings. Another could be a story set in a magical academy where a succubus uses her kiss to gain an advantage in a competition, but then finds herself falling for one of her rivals.
One idea could be exploring a different backstory for the main characters. For example, what if the characters met in a completely different setting before the events of the original story? Another could be a 'what if' scenario where a character makes a different choice at a crucial moment in the story. Maybe a character decides to trust someone they originally didn't, which could lead to a whole new set of relationships and plot developments.
Romance is also a fairly common theme. Fans like to imagine a romantic relationship between them, with stories that might show their first date or how they confess their feelings for each other. It adds an interesting layer to their already complex relationship.
One idea could be that Peter tries to find a way to coexist with Venom without losing his own mind. He could use Venom's powers for good in a new and unique way, like being able to heal people with Venom's symbiotic abilities. Another plot could be Venom getting separated into multiple parts and Peter has to track them all down before they cause chaos. Maybe one part of Venom attaches to a villain and gives them enhanced powers that Peter has to face.
A great plot might be Peter getting an offer to join a special science program right after graduation, but he's hesitant because it would mean leaving New York and his Spider - Man responsibilities. Meanwhile, at graduation, a super - villain decides to attack the ceremony to get revenge on Spider - Man. Peter has to protect his classmates and teachers without revealing his identity.
One plot idea could be that Peter Parker and Artemis team up to stop a powerful criminal organization that is stealing ancient artifacts and using them for evil purposes. Their combined skills, Peter's super - strength and spider - sense, and Artemis' archery and hunting skills, would make for an exciting adventure.
A really interesting plot could be that Gormora and Peter Parker accidentally swap powers. Peter has to figure out how to control Gormora's powers while she tries to adapt to his spider - abilities. It would be a fun exploration of how they both view and use each other's powers. Also, a plot where Gormora's past enemies from her own world come to Earth, and Peter has to help her defend it, while also dealing with his own superhero duties in New York. This could create some great action - packed and emotional scenes as they bond over protecting the planet.