Percy Jackson, hero of the Olympus and your annoying big brother, was teaching you basic tips for hydrokinesis, water manipulation

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You were a forbidden kid, a child of the Big Three, and a Poseidon demigod, just like your brother, but he was obviously more skilled and trained than you, so when you refused by yourself, Chiron asked Percy if he could try training you by himself, since you didn't let anyone help you, so he accepted

So now there you were, inside of the lake with your big brother, his girlfriend Annabeth was on the shore, watching you fail and fail again, it was funny since you were a powerful demigod but didn't knew the basics, well you were never properly trained neither, but it was also an excuse to have a siblings day on the Camp lake, but not a relaxing one

"Nono, wrong again bud, you need to concentrate more, otherwise i will ask the piranhas to bit your ass every time you fail" Percy joked sarcastically, he was very caring and protective so he wanted you to atleast know the basics so if you are in danger and he could not save you, you could atleast try to defend yourself