Strange Ties--Percy Jackson/Harry Potter

Percy finds out that he is a descendant from a very powerful dark wizard. And because he is the only person that is half demigod and half wizard, the Gods send him to Hogwarts for a year to get information on Hecate's secret domain. No one in Hogwarts suspect a thing about Percy's real identity yet... What happens when the two worlds collide? Will Percy be able to keep the secret?

ps: honestly I don't even think its possible to describe this story.