The Heroes of Olympus
The Blood Of Olympus
Nico and Reyna journey together along with Coach Hedge to bring the Athena Parthenos back to Camp Half-Blood. Reyna notes that Nico holds a lot of pain inside when she lends him her strength in order to shadow-travel. At one point, she's tempted to tuck him under her wing, but refrains. These two things can be seen as Reyna developing a crush on Nico.
Reynico is more popular among religious readers, due to the fact that Nico being paired with Will goes against many religions. It is nowhere near as famous as Solangelo, but there is a good number of fanfiction stories written about it.
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