The relationships can be developed through shared battles. When Naruto and the fem tailed beasts fight side by side against common enemies, they can start to trust each other more. For instance, if they face a powerful rogue ninja together, they'll learn about each other's combat styles and strengths.
One plot idea could be that the female tailed beasts are initially distrustful of Naruto. But as they interact more, they discover his pure heart. For example, the Two - Tails might be constantly on edge around Naruto at first. Then Naruto saves her from a powerful enemy, and she starts to respect him. Another idea is a love triangle between Naruto and two of the fem tailed beasts, like the Five - Tails and the Eight - Tails. This could create a lot of drama and tension in the story.
One interesting storyline could be about the tailed beasts forming an alliance outside of the control of humans. They might work together to protect their own kind and the world in a different way than the shinobi. For example, they could create their own hidden land where all chakra - based creatures are welcome.
In this fanfiction, Naruto could control all the tailed beasts because of his unique chakra nature. His chakra is very special and has a high compatibility with the tailed beasts' chakra. Also, his experiences with Kurama might have given him insights on how to handle other tailed beasts. He probably communicates with them on a spiritual level and convinces them to work together with him.
Well, in many fanfictions, Naruto might use his strong will and the power of his Uzumaki heritage. His natural chakra reserves are huge, which helps. He also has a deep understanding of friendship and the tailed beasts' pain from his own experiences. So, he can connect with them on an emotional level and gradually gain their trust, thus being able to control them.
Sakura could be a great help. Her medical skills could come in handy if Naruto gets injured during his battles or difficult encounters while trying to free the tailed beasts. Also, her combat skills have improved over time, so she could fight alongside Naruto.
In this fanfiction, Naruto might face many challenges while freeing the tailed beasts. He could have to battle against powerful enemies who want to keep the tailed beasts captive for their own evil purposes. Also, he would need to gain the trust of the tailed beasts which might not be easy as they have been used and abused for a long time.
In this fanfiction, Naruto might have some deep conversations with the tailed beasts. He could learn more about their pasts and the secrets they hold. Maybe they'll team up against a new common enemy.
In fanfiction, the origin of Naruto having 2 tailed beasts could be due to a powerful ninja's experiment. This ninja could have been trying to create a super - powerful warrior and decided to combine the power of two tailed beasts into one person, which happened to be Naruto. Or it could be a gift from some sort of god - like being in the Naruto universe. This being might have seen Naruto's potential and decided to bestow an extra tailed beast on him to help him in his future battles and challenges.
Naruto is obviously one of the most popular characters. Since he has a strong connection to the tailed beasts in the original series, in fanfiction, he often takes on even more heroic and complex roles related to them.