There will be no Percy x Annabeth or in my story Percy x Austin here.
Leo and Nico has a sister-brother relationship with Percy.
Leo and Percy bonded because of their child hood trauma and Gabe's abuse.
Nico and Percy bonded because Percy had fallen into Tartarus twice. One time with Nico and the other with Austin. When she fell in with Nico they were about to get killed so she made a deal with the Titans and giants that they could take her instead of Nico . They promised on the river Styx but took Nico memories and made it seem like only Nico fell in. While Nico travelled Tartarus and escaped Percy got tortured by all the monsters she had killed for 5 months which was only 5 minutes in the upper world. When Nico found out he had apologized for being angry at her and they had bonded as well. Leo, Nico and Percy hung out more and became very good friends. Nico calls Percy sorella and Leo calls Percy Hermana. Percy calls Nico fratello and Leo hermano.
And that's all I think. This story entire belongs to Rick Riordan.

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Persea Jackson The Fifteenth Olympian
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