Mark of Poseidon | Leo Valdez x Reader

(Y/N) (L/N) isn't what you would call a "normal person". She goes to a crappy school and goes home to her mother and an abusive step-father. She used to have a brother named Percy but he disappeared without a trace about four years ago when she was 12. Her mother started acting odd since his disappearance. It seemed like she was hiding something from her. When (Y/N) finally had enough of her living situation and ran away a monster comes out of nowhere and attacks her. She would've died but a blond girl saves her with a scary looking sword. She takes (Y/N) to a place she calls 'Camp Half-Blood'.
(Y/N) is able to relax for some time until the Oracle delivers a prophecy they call 'The Mark of Poseidon' and she had to embark on a terrifying journey.
READ BELOW IT'S IMPORTANT!!!!
This will take place at the book Mark of Athena and stretch into House of Hades too. This will not be like the books as in the title it is 'Mark of Poseidon' instead of Mark of Athena. So don't get mad if you don't like it as you were warned.
**I do not own any of the characters except (Y/N) credit goes to Rick Riordan. **