Perhaps the fanfic could start with Android 18 getting into some trouble that only Krillin can help her out of. As they work together to solve the problem, they start to realize their feelings for each other. It could include scenes of them exploring new places in the Dragon Ball world, sharing their thoughts and past experiences, and gradually falling in love while still being the kick - ass fighters we know them to be.
One possible plot could be that Krillin discovers a new power within himself while training with Android 18. And as they train, their friendship blossoms into something more. They might have to deal with other Z - fighters being a bit skeptical about their relationship at first. But in the end, they prove that their bond is strong and they are a great team.
Krillin could be developed by showing his growth from being a bit of a coward sometimes to a more confident fighter because of his relationship with Android 18. Android 18 might be developed to show a softer side, especially towards Krillin. For example, she could start to care more about his well - being and show emotions that she previously hid.
The fanfiction could explore their relationship growth over time. How they gradually became closer and more in - sync with each other. It could show how they supported each other through tough times, like when Krillin was worried about protecting the Earth from new threats and Android 18 was there to give him confidence and strength.
There are likely some fanfics about Krillin and Android 18 that focus on their relationship in a non - sexual and family - friendly way. You can try looking on fanfiction websites like FanFiction.net or Archive of Our Own. Search for stories tagged with 'Krillin' and 'Android 18' to find ones that might interest you.
One good theme could be their family life. How they raise Marron and deal with the daily challenges of being parents in the Dragon Ball world.
A really interesting fanfic idea could be set in a post - apocalyptic version of the Dragon Ball universe. Android 18 and Krillin have to fight to protect the few remaining survivors. They use their unique skills, with Android 18's android powers and Krillin's martial arts. Their relationship becomes a source of hope for those around them, as they prove that love can still exist even in the harshest of times.
One great Android 18, Krillin and Marron fanfic could be one that focuses on their family outings. For example, it might show Krillin taking Android 18 and Marron to a picnic by the lake. They could have cute interactions like Marron trying to feed the ducks while Android 18 watches protectively and Krillin just enjoys the moment with his family. Another could be a fanfic where they face a new threat in their city and they all work together to overcome it, with Android 18 using her strength, Krillin his martial arts skills, and Marron showing her cleverness in some way.
A possible plot could be that Android 18 gets injured during a fight and Goku takes it upon himself to protect and heal her. This close proximity leads to the development of feelings, which is where the 'lemon' part might come in. Their relationship could be a secret at first as they are from different 'worlds' in a sense, with Goku being a Saiyan hero and Android 18 being an android once created for destruction.
Well, it could be about Android 18's adventures in a new world created in the fanfic. Maybe she teams up with some other characters to fight a new threat.
Maybe in the fanfiction, Goku accidentally uses a new technique that causes him and Android 18 to be mentally linked. Through this link, they start to understand each other on a deeper level. They then find themselves drawn to each other's strength and determination. But they have to hide their growing relationship from their friends and family who might not understand.
It could be a story where Naruto's positive energy starts to influence Android 21's darker side. Android 21 has a somewhat sinister side to her in the original context. But Naruto's infectious optimism and his belief in the good of people could start to change her. They might go on a journey to find a way to completely purge Android 21 of her negative tendencies, and in the process, they develop a deep bond.