Consider, a situation where Nico mentions that the Hades cabin is really drab inside and doesn’t have much in the way of things to brighten it up.
Will, who has yet to tell anyone about his crush except Kayla and Austin, ends up leaving flowers for Nico in various places with his name on it. At first Nico thinks it’s some sort of joke, but the bouquets keep popping up all over. First on the Hades’ cabin picnic table, then in the training arena, next on the front step of his cabin. People start to catch on but Nico is still absolutely baffled. Soon all the people around camp are helping Will organize the secret admirer gifts and one morning Nico wake up to find the whole of Hades cabin covered in wreathes of Hyacinth, which only grow near and around the Apollo cabin.
The next morning Will find’s a little bouquet of poppies in his seat at breakfast, the only flowers that grow around Hades’ cabin.