One possibility is that the gods are spying because they fear Percy and Annabeth might be planning something that could disrupt the balance between the mortal and divine worlds. For example, they could be working on a project that might give mortals too much power over the gods, so the gods want to keep an eye on them to stop it if necessary. Also, it could be that the gods are just being nosy as they are often interested in the affairs of their favorite demigods.
In this fanfiction, the gods might be spying on Percy and Annabeth because of a prophecy. The gods always take prophecies seriously. They could be watching to see if Percy and Annabeth will fulfill the prophecy in a way that benefits or harms the gods. Maybe there are some parts of the prophecy that the gods don't want to come true, so they spy on them to interfere at the right moment.
Aphrodite could also be one of the spying gods. Since she loves meddling in love affairs, and Percy and Annabeth's relationship is quite famous among the demigods. She might be spying to see how their relationship develops and perhaps add a little nudge here and there if she feels like it.
One possibility could be that they are in a school setting where they have to wear uniforms. Percy might constantly be getting in trouble for not following the uniform code properly, like having his tie askew or his shirt untucked. Annabeth, being more organized, tries to help him out. This could lead to some comical moments as well as deeper conversations about fitting in and following rules.
Well, perhaps Percy takes Annabeth on a quest to a special location, like an ancient Greek ruin they've always wanted to explore. During this adventure, he finds the perfect moment when they're alone and surrounded by the beauty of the place to pop the question.
It could be a beach day scenario. Maybe they are having a day off from their adventures and just relaxing on the beach in their bikinis and swim trunks, enjoying the sun and having some light - hearted conversations.
One possible plot could be their daily adventures in a new city. They might face challenges like dealing with strange neighbors or finding new jobs. Maybe they also have to hide their demigod powers from the normal humans around them.
The fanfiction could also focus on the relationship between Annabeth and Percy during this time. They might have disagreements on how to handle the situation. For instance, Percy might want to keep Annabeth safe at all costs and not let her go on any dangerous missions, while Annabeth feels that she needs to be involved to protect their child. This could lead to some tension between them, but in the end, they would work through it and become even closer as they anticipate the birth of their baby.
Perhaps in this fanfiction, a villain has somehow transferred Percy's power of hypnosis to himself and uses it on Annabeth to get information from her. Percy then has to race against time to break the hypnosis and save Annabeth, all while facing various challenges and obstacles set by the villain.
One possibility could be that they are banished due to a false accusation. Maybe someone in the camp frames them for a serious crime they didn't commit, like stealing a powerful magical artifact. So, they are forced to leave and then have to prove their innocence while on the run from those who banished them.
One possible plot could be that Percy and Annabeth are on a quest in Paris. They might be searching for a lost Greek artifact that has somehow ended up in the city. Along the way, they explore the famous landmarks like the Eiffel Tower and Louvre Museum, all while facing various monsters in disguise among the tourists.
I think 'the gods spy on percy fanfiction' would likely involve the gods using their various powers to keep an eye on Percy. They could be using magic, or enlisting the help of other mythical creatures. This fanfiction might also show how Percy's friends get involved when they discover the spying, and the resulting conflicts or alliances.