One possible plotline could be the challenges they face as they prepare for the arrival of the baby. This might include things like getting their home ready, dealing with the reactions of their friends and family.
I'm sorry, I'm not aware of specific fanfictions about Cana and Bacchus being pregnant. You could try searching on popular fanfiction websites like Archive of Our Own or Fanfiction.net.
A great Cana x Bacchus fanfiction often has well - developed characters. It should stay true to their personalities as seen in the original Fairy Tail series. For example, Cana's love for alcohol and her strong - willed nature, and Bacchus' party - loving and somewhat competitive side.
One common theme could be the exploration of their relationship. How they interact, get to know each other better, etc.
Their relationship can be developed through shared experiences. For instance, if they go on a mission together and face a powerful enemy. They have to trust each other and use their respective magics in harmony to defeat the foe. This would create a bond of trust between them.
You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. These platforms have a large collection of Fairy Tail fanfictions, including ones about Cana and Bacchus. Just use the search function and type in 'Fairy Tail Cana x Bacchus' and you'll get a list of relevant stories.
One plot idea could be Bacchus and Cana teaming up for a drinking competition that turns into a magical adventure. As they drink, they start to unlock hidden magical powers within themselves that they didn't know they had. Another idea is a story where Bacchus helps Cana overcome her insecurities about her magic. He could use his own experiences to guide her and in the process, they develop a deep friendship. Or perhaps a plot where they are both on a quest to find a rare magical item that has a connection to their families' pasts.
One possible plotline could be that Tinkerbell's pregnancy is a magical accident. Maybe she was exposed to some strange magic that caused this unexpected situation. Another could be that she is in love with a fairy or a character from the Peter Pan universe and they are starting a family together.
One possible plotline could be how Nami and the other Straw Hat crew members react to her pregnancy. Maybe they would be overly protective or excited. Another could be about Nami dealing with the physical and emotional changes during pregnancy while still being part of the crew's adventures.
One possible plotline could be Ursula dealing with the challenges of pregnancy while still maintaining her powerful and devious nature. For example, she might use her pregnancy to her advantage in some scheme against her enemies.
A plotline could involve Mulan's partner and how they support her during the pregnancy. It could also show how Mulan's pregnancy impacts her relationships with the people she has met during her previous adventures. Maybe there are some who are skeptical or some who are very supportive. Also, the story could explore how Mulan prepares for the arrival of the baby in the context of the world she lives in, whether it's the military - based world she was a part of or her family - centered village life.