No, it's not appropriate. Writing such fanfics involving sexual content between characters in a disrespectful or inappropriate way goes against moral and ethical standards, especially when it involves deities from mythology in a vulgar context.
You could write about their adventures together in a more family - friendly and respectful way. Maybe they team up to solve a problem in the realm of the gods, with no sexual undertones at all. Focus on their different powers and how they can combine to achieve a goal.
No. Zeus's stories in Greek mythology are part of a fictional and symbolic narrative. They were created by the ancient Greeks to explain various aspects of their world, such as the origin of certain heroes or natural phenomena. These stories are not based on real events in the sense of a 'true sex story'.
There is no appropriate or real 'Zeus sex story' in a proper sense as Zeus in Greek mythology has many complex relationships that are often more about power, procreation, and the structure of the mythological world rather than what might be considered vulgar 'sex stories'. Zeus was known for his many affairs with goddesses and mortal women, which led to the birth of numerous heroes and demigods. But these are better understood in the context of the overall mythological narrative.
Love and relationships are also frequent themes. Zeus had many affairs, so in fanfics, his relationships with different goddesses and mortals are often explored. It could be about his true love or his more scandalous affairs.
I'm not sure if there is an exact 'Naruto brother of Zeus' fanfic. There are countless fanfictions out there, and while the idea of combining Naruto and a figure from Greek mythology like Zeus in a fan - created story is very creative, it might be a rather unique and not so common combination. You could try searching on major fanfic platforms like FanFiction.net or Archive of Our Own.
The story of Percy and Zeus' friendship could begin with Percy being summoned to Olympus. Zeus has been observing Percy for a while and is intrigued by his abilities. At first, there is tension between them. But as they are forced to work together on a mission to retrieve a lost and powerful artifact, they start to see each other in a new light. Percy shows Zeus his loyalty and Zeus offers Percy protection. This newfound friendship gradually changes the dynamic between demigods and gods, leading to a more harmonious co - existence.
Family relations are also common. Since Zeus is Ares' father, their relationship as father - son can be a central theme. It could be about love, conflict, or the passing on of power and wisdom within the family unit. Another aspect is the theme of war and peace. Ares is the god of war and Zeus has to maintain order, so their interactions can be related to whether to start a war or keep the peace.
I'm not sure specifically what that particular fanfic is about as I haven't read it. It could potentially be a fan - created story that focuses on the relationship between Zeus and Hera with some sort of unique or interesting twists. Maybe it reimagines their mythological relationship in a modern or different setting.
A fanfic about Percy, brother of Zeus, could start with Percy feeling a sense of isolation. Despite being part of the divine family, he doesn't quite fit in. He decides to leave Olympus for a while and explore the mortal world. There, he experiences the joys and sorrows of humanity in a way that Zeus never has. He falls in love with a mortal, which causes a huge rift between him and Zeus. This love story could be the central theme of the fanfic, with Percy having to choose between his family and his new - found love.