Percy Jackson and Harry Potter-Secret Mission as a Guardian

Percy Jackson is sent on another wild adventure with the wizards when Hecate approaches him and pleads with him to save her community of wizards. Harry has little chance of surviving until he's 17, and strong enough to fight on his own. Hecate's world will collapse if he doesn't survive, so she sends Percy to be Harry's guardian. He's sent alone with instructions to never, at all costs, reveal his identity.
Disclaimer: I do not own the PJO or HP series
P.S. If you haven't read the Percy Jackson series as well as the Harry Potter one, some parts of this book might not make sense.
I also might have taken some ideas from your book(if you've written one) and added it to my book(with a few modifications) Don't be mad, it's only because I loved it.

I will try my hardest to update once a week, but I'm going to try even harder to not quit on this book until it's finished.