I'm not sure specifically about this particular fanfiction. Fanfiction can cover a vast range of scenarios, and while this is a rather unorthodox and not very positive one in the context of the characters, it might exist in some corner of the fanfiction world. You could try searching on popular fanfiction websites.
There could be such fanfiction out there. Fanfic writers often explore all kinds of relationships and plot twists, even ones that deviate from the original character dynamics like this. However, it goes against the general perception of the relationship between Annabeth and Percy in the original series. It's important to note that fanfiction doesn't always adhere to the 'canon' of the original work.
It's possible that there is fanfiction with this plot. But this kind of plot is quite controversial as Annabeth and Percy have a strong and beloved relationship in the original story. Some fans might create such fanfiction to explore different relationship dynamics or to create drama, but it might not be well - received by all fans of the original series. You can search on websites like Archive of Our Own or FanFiction.net to see if it exists.
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Chapter 262, ", Settlement of the Heijian Star Battle", is the clearest early answer because the buildup finally cashes out in a real clash. Early on, Thus, creating a true puppet had become necessary.. By the end, Fortunately, with the home-field advantage in the Divine Realm, he.... Inside the broader battle storyline, the danger stops being abstract and the conflict around Settlement of the Heijian Star Battle becomes immediate, forcing the surrounding cast to react under pressure.
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Chapter 280, ", The Voice of Fury", is the clearest early answer because it turns Anat's situation into a concrete plot event. The setup is Anat's expression became stern and tense., but the pressure keeps building through He immediately alerted his brothers in combat about the change in....
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