In The Midst Of War... (Solangelo AU)
Will goes to Italy for a gap year before starting college, and (literally) runs into Nico Di Angelo, a moody and resentful Italian, his sister Bianca, who is a lot nicer, and their mother, who doesn't even speak English.
When America declares war on Italy, Will finds himself trapped in Italy with a lot of enemies. Bianca takes him in, promising to help, but Nico is having none of it. The boys have nothing in common, but Bianca makes Nico tolerate Will.
Despite all of his desperate attempts at friendship, Nico refuses to be anything more than acquaintances. Then disaster strikes, and they are forced to make things work between them.
This is a Solangelo/willico fanfic. The characters don't belong to me, they belong to Rick Riordan