HEY! I adopted this story from @IbbyBird !!! I'm not gonna even TRY and copy all that's already been done, so go to Ibby's page and click on "Nico goes to Hogwarts"! (Also click follow). Have you done the reading of the original? No? Do it before u read this or else it won't make sense. Here's the summary that was originally on there.
The Giant War didn't end the way it was supposed to. Oh, don't worry, the demigods won of course - but at a price.
With the Seven gone, Nico di Angelo and Thalia Grace were the last children of the Big Three. Campers looked up to them for guidance - that is, until Thalia is killed in a hunt. Camp Half-Blood and Camp Jupiter alike didn't take their losses well, and took it out on the only person they could think of. Nico, the creepy Son of Hades.
Two years later, Nico has long since left the miniature hell called Camp and is traveling around the world with his boyfriend, Will. Completing Quests and fixing relationships with their families was their aim for the next few years - but then Nico was offered Godhood , and Will was suddenly the Guardian of the Hunt.
For their next quests as immortals, Nico and Will are sent undercover by Hecate and Apollo into a magical school to defeat 'Lord Voldemort' before he starts a War, essentially nipping the problem in the bud. It wouldn't be easy, though. Of course not.
Life is never easy with a certain trio around...
*During Goblet of Fire*